Answers
To answer the first question, we need to determine the location of the center of gravity of the system. Assuming the person and ladder can be treated as a uniform object, the center of gravity will be located at the midpoint of the ladder.
Let's say the ladder is 10 feet long, so the midpoint would be 5 feet from either end. If we assume the ladder is resting at a 60 degree angle against a vertical wall, we can use trigonometry to determine the horizontal distance of the center of gravity from the point where the ladder touches the ground.
Using the sine function, we know that sin(60) = opposite/hypotenuse, so the opposite side (which is the vertical height of the ladder) is 10*sin(60) = 8.66 feet. Therefore, the horizontal distance from the center of gravity to the point where the ladder touches the ground is also 8.66 feet.
To answer the second question :
We need to calculate the torque about the axis of rotation (point B) by taking the total weight of the person + ladder acting at the center of gravity. The formula for torque is torque = force x distance.
The force is equal to the weight of the person + ladder, which we'll assume is 300 pounds. The distance is the horizontal distance we just calculated, which is 8.66 feet.
So the torque about point B would be 300 pounds x 8.66 feet = 2,598 Newton-meters (Nm) or 2,598 pound-feet (lb-ft).
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Related Questions
One end of a spring with a spring constant of 109 N/m is held firmly in place, and the other end is attached to a block with a mass of 2.13kg. The block undergoes SHO (simple harmonic motion) with no friction. At time t = 0.6763s, the position and velocity of the block are:
x(0.6763s) = -0.1031m
y(0.6763s) = 0.5303m/s
A. What was the position, in meters, at t = 0.00s?
B. What was the velocity, in meters per second, at t = 0.00s?
Answers
At time zero, the location is -0.1031m, and the speed is 0 m/s.
How can you determine a block's top speed?How fast can the block go at its most. When the spring reaches its equilibrium length, all of the stored energy in the spring is transferred to kinetic energy, and the block accelerates to its maximum speed. Since the item is at rest, Ki = 0. As there is no friction, Wnc = 0.
A = x(0.6763s) = -0.1031m
v(0.6763s) = -Aω sin(ω*0.6763s) = 0.5303 m/s
ω = sqrt(k/m) = sqrt(109 N/m / 2.13 kg) = 5.148 rad/s
Now we can use these values to find the position and velocity at t = 0:
A cos(ωt) = A cos(0) = A = -0.1031m
-v(0) = Aω sin(ωt) = -Aω sin(0) = 0
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A charged particle is located 1 meter away from a charged sphere, and experiences a force of −0.5 N. If the distance is increased to 2 meters, which of the following would be correct?
A.The force would be one-fourth the original force.
B.The force would be one-half the original force.
C.The force would be two times greater.
D.The force would be four times greater.
Answers
the correct answer is A. The force would be one-fourth the original force.
According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
The mathematical expression for Coulomb's law is:
F = k * q1 * q2 / [tex]r^2[/tex]
where F is the force, k is the Coulomb constant, q1 and q2 are the charges of the particles, and r is the distance between them.
In this case, the force is given as -0.5 N, which means that the charges must be of opposite signs. Let's assume that the charged sphere has a positive charge, so the test particle must have a negative charge. The distance between them is initially 1 meter.
Plugging in the given values into Coulomb's law, we get:
-0.5 N = k * q_sphere * q_particle / [tex](1 m)^2[/tex]
where q_sphere is the charge of the sphere and q_particle is the charge of the test particle.
If we double the distance between the particles to 2 meters, then the new force can be calculated using the same equation:
F' = k * q_sphere * q_particle / ([tex]2 m)^2[/tex]
To determine how the new force F' relates to the original force F, we can take the ratio of the two equations:
F' / F = (k * q_sphere * q_particle / [tex](2 m)^2\\[/tex]) / (k * q_sphere * q_particle / (1 [tex]m)^2[/tex])
= (1/4)
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Answer: A
Explanation: the correct answer is A, The force would be one-fourth the original force.
In the most common form of colorblindness, a cone system malfunctions, rendering the color
indistinguishable from other color combinations.
Answers
The most common form of color blindness is called red-green color blindness.
This type of color blindness is caused by a malfunction of the red and green cone systems in the eye, which are responsible for detecting different wavelengths of light. This malfunction causes individuals to have difficulty distinguishing between certain combinations of red and blue, as they appear to be the same color or shade to the affected person. The exact cause of this malfunction is still unknown, but is believed to be caused by genetic factors, environmental influences, or a combination of both.This color blindness affects up to 8% of men and 0.5% of women, and is caused by a mutation in the gene that codes for the red-sensitive cone cells in the eye.
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complete question:in the most common form of color blindness, the ___ cone system malfunctions rendering ____ indistinguishable from certain combinations of blue and red
1.datemine the mechanical energy of mass 200g of bird fling at 12m/s at height of some use (g=12m/s²)
2. calculate the GPF of the following
A. A 20kg lifed 2m into air
B. sixty 6kg boxes lifted into shelf 2m high
3. calculate the kinetic energy of
A. 3g of bullest travelling at 40m/s
B. A car of mass 1200kg that travelling 60m in 3 seconds
Answers
The mechanical energy of the bird is 26.4 J.
Mechanical energy calculation.To determine the mechanical energy of the bird, we need to calculate its kinetic energy and potential energy.
Kinetic energy = 1/2 * mass * velocity^2
Potential energy = mass * gravity * height
Given:
Mass = 0.2 kg
Velocity = 12 m/s
Height = unknown
Gravity = 12 m/s^2
Kinetic energy = 1/2 * 0.2 * 12^2 = 14.4 J
To find the potential energy, we need to know the height. Let's assume it is 5 meters.
Potential energy = 0.2 * 12 * 5 = 12 J
Mechanical energy = kinetic energy + potential energy
Mechanical energy = 14.4 + 12 = 26.4 J
Therefore, the mechanical energy of the bird is 26.4 J.
A.
Gravitational potential energy = mass * gravity * height
GPE = 20 * 9.81 * 2 = 392.4 J
The work done to lift the object is equal to its gravitational potential energy, so the GPF (Gravitational Potential Force) is 392.4 N.
B.
Total mass of boxes = 60 * 6 = 360 kg
Gravitational potential energy = mass * gravity * height
GPE = 360 * 9.81 * 2 = 7069.2 J
The work done to lift the boxes is equal to their gravitational potential energy, so the GPF is 7069.2 N.
Therefore, the GPF for the 20 kg lift is 392.4 N and the GPF for the 60 boxes is 7069.2 N.
A.
Kinetic energy = 1/2 * mass * velocity^2
KE = 1/2 * 0.003 * 40^2 = 2.4 J
Therefore, the kinetic energy of the 3 g bullet travelling at 40 m/s is 2.4 J.
B.
We can calculate the average velocity of the car using the formula:
Average velocity = distance / time
Average velocity = 60 / 3 = 20 m/s
Kinetic energy = 1/2 * mass * velocity^2
KE = 1/2 * 1200 * 20^2 = 240,000 J
Therefore, the kinetic energy of the car is 240,000 J.
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How many waves are on this string?
Answers
A standing wave is composed of two waves with the same frequency and amplitude traveling in opposite directions and interfering with each other. Thus we have to waves here.
Is a standing wave composed of two waves?These waves are known as the incident wave and the reflected wave. When the incident wave and the reflected wave interfere constructively, they create points of maximum displacement known as antinodes.
When they interfere destructively, they create points of minimum displacement known as nodes. The pattern of antinodes and nodes remains fixed in space, giving rise to a standing wave.
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A sample of an unknown material appears to weigh 300N in air and 200N when immersed in alcohol of density 700kg/m^3 . What is the volume and density of the material
Answers
Answer:
the volume of the material is 0.0145 m^3 and its density is 20690.3 kg/m^3.
Explanation:
To solve the problem, we can use Archimedes' principle, which states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.
Let's first find the weight of the unknown material in air:
W_air = 300 N
Next, let's find the weight of the unknown material in alcohol:
W_alcohol = 200 N
We can find the buoyant force acting on the material by subtracting the weight in alcohol from the weight in air:
F_buoyant = W_air - W_alcohol = 300 N - 200 N = 100 N
According to Archimedes' principle, this buoyant force is equal to the weight of the alcohol displaced by the material:
F_buoyant = ρ_alcohol * V * g
where ρ_alcohol is the density of the alcohol, V is the volume of the material, and g is the acceleration due to gravity.
Substituting the values we know:
100 N = 700 kg/m^3 * V * 9.81 m/s^2
Solving for V:
V = 0.0145 m^3
Finally, we can find the density of the material by dividing its weight in air by its volume:
ρ_material = W_air / V = 300 N / 0.0145 m^3 = 20690.3 kg/m^3
Therefore, the volume of the material is 0.0145 m^3 and its density is 20690.3 kg/m^3.
You are standing on the surface of a spherical asteroid 10 km
in diameter, of density 3000 kg/m3
.
Part A
Calculate the escape velocity from the asteroid in km/s
.
Answers
The required escape velocity from the asteroid in km/s and mph is 2.0 km/s and 4478 mph, respectively.
How frequently do asteroid 10 km hit the Earth?According to analyses of orbital statistics, asteroids of 10 km in size can strike the planet every 100 My or so, which is consistent with the theory that we were struck by an object of this size 65 My ago.
Part A: Escape velocity is the bare minimum speed at which an object can break out of an astronomical body's gravitational influence. The following provides the escape velocity formula:
v = √((2GM)/r)
Where, G = gravitational constant M = mass of the astronomical body r = radius of the astronomical body
Now, let's substitute the given values to find the escape velocity from the asteroid.
Given, Diameter of the asteroid, d = 10 km
So, radius of the asteroid, r = d/2 = 5 km = 5 × 10³ m
Density of the asteroid, ρ = 3000 kg/m³
Mass of the asteroid, M = ρ × volume of the asteroid= ρ × (4/3)πr³= 3000 × (4/3) × π × (5 × 10³)³= 6.54 × 10¹¹ kg
Gravitational constant, G = 6.67 × 10⁻¹¹ Nm²/kg²
Putting all these values in the escape velocity formula, v = √((2GM)/r)= √((2 × 6.67 × 10⁻¹¹ × 6.54 × 10¹¹)/5 × 10³)= 2.0 km/s
Therefore, the escape velocity from the asteroid is 2.0 km/s.
Part B : Now, let's convert the escape velocity from km/s to mph.1 km = 0.621371192 milesSo, v in mph = 2.0 km/s × (0.621371192 miles/km) × (3600 s/hour)= 4478 mph
Therefore, the escape velocity from the asteroid is 4478 mph (rounded to three significant figures).
Hence, the required escape velocity from the asteroid in km/s and mph is 2.0 km/s and 4478 mph, respectively.
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Question:
You are standing on the surface of a spherical asteroid 10 km in diameter, of density 3000 kg/m3.
Part A
Calculate the escape velocity from the asteroid in km/s.
Express your answer in kilometers per second using two significant figures.
Calculate the escape velocity from the asteroid in mph.
Express your answer in miles per hour using three significant figures
A jar of tea is placed in sunlight until it
reaches an equilibrium temperature of 33.3
◦C .
In an attempt to cool the liquid, which has a
mass of 187 g , 133 g of ice at 0.0
◦C is added.
At the time at which the temperature of the
tea is 31.8
◦C , find the mass of the remaining
ice in the jar. The specific heat of water
is 4186 J/kg ·
◦ C . Assume the specific heat
capacity of the tea to be that of pure liquid
water.
Answer in units of g.
Answers
Answer:
130.43g
Explanation:
First, we need to calculate the heat lost by the tea when it cools down from 33.3°C to 31.8°C. We can use the formula Q = mcΔT, where Q is the heat lost, m is the mass of the tea, c is the specific heat capacity of water, and ΔT is the change in temperature.
The mass of the tea is given as 187g and the specific heat capacity of water is 4186 J/kg·°C. The change in temperature is (33.3 - 31.8)°C = 1.5°C.
So, the heat lost by the tea is: Q = (187g) * (4186 J/kg·°C) * (1.5°C) = 1174.05 J
This heat is gained by the ice, causing it to melt and warm up to 0°C. The heat required to melt ice is given by Q = mL, where m is the mass of ice melted and L is the latent heat of fusion of water.
The latent heat of fusion of water is 334 kJ/kg. So, we can calculate the mass of ice melted as: m = Q / L = (1174.05 J) / (334 kJ/kg) = 0.0035 kg = 3.5g
However, not all of the ice will melt. Some of it will remain as ice and some will become water at 0°C.
Let’s say that x grams of ice melts completely and becomes water at 0°C. The remaining (133 - x) grams of ice will stay as ice.
The heat required to melt x grams of ice is: Q1 = x * L
The heat required to warm up x grams of water from 0°C to 31.8°C is: Q2 = x * c * (31.8 - 0)
The total heat gained by the ice and water is: Q = Q1 + Q2
Substituting the values we get: 1174.05 J = x * L + x * c * (31.8 - 0)
Solving for x, we get: x = 1174.05 J / (L + c * (31.8 - 0)) = 2.57g
Therefore, out of the initial 133g of ice, only 2.57g melts completely and becomes water at 0°C.
The remaining mass of ice in the jar is: 133g - 2.57g = 130.43g
So, at the time at which the temperature of the tea is 31.8°C, there are approximately 130.43g of ice remaining in the jar.
Starting at t = 0, a horizontal net force F⃗ =(0.290N/s)ti^+(−0.445N/s2)t2j^
is applied to a box that has an initial momentum p⃗ =(−3.10kg⋅m/s)i^+(4.10kg⋅m/s))j^
.
a) What is the x-component of the momentum of the box at t = 2.00 s ?
b) What is the y-component of the momentum of the box at t= 2.00 s ?
Answers
a) The x-component of momentum is given by pₓ = m * vₓ, where m is the mass of the box and vₓ is the x-component of velocity. Since the force is only acting in the x-direction, there is no net force in the y-direction, and the y-component of momentum is conserved.
Therefore, we can use the initial y-component of momentum to find the y-component of momentum at any time.
At t = 2.00 s, the x-velocity can be found by integrating the x-component of the force:
Fₓ = (0.290 N/s)t
vₓ = ∫Fₓ dt = (0.145 N/s)t² + C
Using the initial condition that vₓ(0) = pₓ(0)/m = (-3.10 kg⋅m/s) / (m), we can solve for C:
C = -3.10 m/s
Therefore, vₓ = (0.145 N/s)t² - 3.10 m/s
And the x-component of momentum at t = 2.00 s is:
pₓ = m * vₓ = m * [(0.145 N/s) (2.00 s)² - 3.10 m/s]
pₓ = (550 kg) * [-1.54 m/s] ≈ -847 kg⋅m/s
b) As mentioned above, the y-component of momentum is conserved since there is no net force in the y-direction. Therefore, the y-component of momentum at t = 2.00 s is the same as the initial y-component of momentum, which is:
pᵧ = m * vᵧ = m * [(4.10 kg⋅m/s) / (m)] = 4.10 kg⋅m/s
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10/a = 15/24 a=?
please help
Answers
Haha we have the same name
A 40kg child on a 50kg bike is riding with a velocity of 10 m/s to the northern.
Answers
Answer:
Explanation:
The vertex of an absolute function is the minimum or the maximum point of the graph
The graph that could be is (a) an absolute value graph has a vertex at (2, 1)
The function is given as:
And the coordinates of the vertex (h,k) are said to be positive.
From the list of given options, only the first option has both coordinates of the vertex to be positive i.e. (2,1)
Hence, the graph that could be is (a)
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Paul reported a measurement in units of hertz. What property of a wave was he measuring?*
A.Wavelength
B.Frequency
C.Period
D.Amplitude .
Answers
Answer:
B. Frequency
Explanation:
Frequency is measured in the unit Hertz (Hz).
A glass block appears to be 6cm thick when viewed from above. If the refractive index of the glass is 1.5, what is the actual thickness of the block?
Answers
n1 sin θ1 = n2 sin θ2
where n1 and n2 are the refractive indices of the first and second media, respectively, θ1 is the angle of incidence, and θ2 is the angle of refraction.
In this problem, we can assume that the light is incident vertically on the glass block, so θ1 = 0°. We want to find the actual thickness of the block, which we can call d. We know that the apparent thickness when viewed from above, which we can call h, is 6 cm.
We can use Snell's law to relate the refractive index of the air to that of the glass:
n1 sin θ1 = n2 sin θ2
sin 0° = 1.5 sin θ2
0 = 1.5 sin θ2
This equation tells us that the angle of refraction is also 0°, which means that the light passes straight through the glass block without deviating from its path. Therefore, the apparent thickness h is equal to the actual thickness d:
h = d
So, the actual thickness of the block is 6 cm
Need help with this
Answers
(9) None of the options listed in the question are correct as a risk assessment approach to environmental hazards.
(10) House debt is not a direct effect of housing on health (option D)
What is risk assessment?A risk assessment approach to environmental hazards aims to take into account all of the following factors, including the health outcome, inherent danger, quantity of exposure, and route of exposure. Therefore, none of the options listed in the question are correct as all of them should be considered in a risk assessment approach to environmental hazards.
10. While housing affordability and financial stress related to housing can indirectly affect health, they are not a direct effect of housing itself on health.
The other options are direct effects of housing on health:
A. Proximity to services and facilities, such as healthcare, education, and transportation, can affect health outcomes.
B. Materials effects of housing, such as ventilation, insulation, and building materials, can directly affect indoor air quality and physical health.
C. Insecure housing, such as homelessness or living in overcrowded or unsafe conditions, can lead to physical and mental health problems.
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Sabrina takes a self-report, objective personality rest that asks her to agree or disagree with over 300 statements such as, "I forgive people easily" and "I often got into trouble when I younger". Sabrina is probably taking the
Answers
Sabrina is probably taking the Big Five Personality Test.
What are the three impartial personality assessments?The Beck Depression Inventory, Millon Clinical Multiaxial Inventory-III, Minnesota Multiphasic Personality Assessment, and Child Behavior Checklist are some of the frequently used objective personality tests.
What are a few illustrations of impartial personality tests?Examples of objective personality assessments include the Big Five Personality Inventory, the Millon Clinical Multiaxial Inventory (MCMI), and the Minnesota Multiphasic Personality Inventory (MMPI).
What is a psychological assessment that is objective and measures mental disorders?The Minnesota Multi-Phasic Personality Inventory (MMPI), which rates people on personality, psychological, and emotional factors, is arguably the most popular of the objective personality tests.
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In the following equations, the distance x is in meters, the time t is in seconds, and the velocity v is in meters per second. What are the SI units of the constants 1 and 2 ? (a) =1+2, (b) =1212, (c) 2=21, (d) =1cos (2), (e) 2=21−(2)2
Answers
Since [1 + 2] = [1] + [2], the Velocity of the constant 1 and 2 must be the same. Therefore, both constants have the same SI units.
What is the relationship between speed and the SI unit?V is the velocity, d is the distance, and t is the duration in the equation V = d/t. Calculate the object's acceleration by dividing its mass by its force, then multiplying the result by the acceleration's duration.
(b) The units of the constants 1 and 2 must be the same because [12 / 12] = 1. As a result, the SI units for both variables are the same.
(c) The units of the constant 2 must be the same as the units of the constant 1 squared because [2] = [2] / [1]. As a result, the SI units for the constants 1 and 2 differ.
(d) The constant 2 must have radians as its units because the cosine function's input must be dimensionless. It is necessary for the constant 1 to have units that enable the cosine function's units to cancel out. This can be done by assigning the constant 1 units that are reciprocal radians, or radians to the power of -1. As a result, the SI units for the constants 1 and 2 are rad-1 and radians, respectively.
Due to the fact that [(2 / 1) - (2)2] equals [(2 / 1)], The units of the constant 2 must match those of the constant 1 cubed, or [22]. As a result, the SI units for the constants 1 and 2 differ.
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EARTH AND SPACE SCIENCE!
Scientist that concluded that the universe was "Earth Centered" after failing to observe any shifting of background stars "stellar parallax" at different times of the year.
a.) Nicolaus Copernicus
b.) Sir Isaac Newton
c.) Tycho Brahe
d.) Johannes Kepler
Answers
Tycho Brahe was the scientist who came to the conclusion that the cosmos was "Earth Centered" after failing to notice any seasonal variations in the background star "stellar parallax."
WHO came to the conclusion that the Earth was the universe's centre?An Earth-centered perspective of the cosmos. Claudius Ptolemy believed that the Earth was at the centre of the universe. Before the controversial findings of Copernicus, Galileo, and Newton, this belief persisted for 1400 years.
Who made the Earth the centre of universe?Around 380 B.C., a scientist by the name of Eudoxus developed the first geocentric universe model. The stars, the sun, and the moon are all incorporated into the sequence of cosmic spheres that make up Eudoxus' universe model.
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I need help answering the following question. Thank you!
Answers
a. The graph does not appear to be symmetrical.
b. The graph appears to be bimodal, as there are two distinct peaks.
c. The data appear to be positively skewed, as the tail of the graph extends further to the right than to the left.
d. There appear to be outliers for values less than 3.5 and greater than 6.75, as these values are relatively far away from the rest of the data and do not fit the overall pattern of the graph.
What is a graph?A graph is described as a structure amounting to a set of objects in which some pairs of the objects are in some sense "related.
Graphs are a popular tool for graphically illuminating data relationships.
In conclusion, A graph serves the purpose of presenting data that are either too numerous or complex to be properly described in the text while taking up less room.
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Being over stressed can make you feel
1. Excited
2. Happy
3. Irritable
4. Relaxed
Answers
Answer: The answer would be 4.
Explanation:
Being stressed is not a good feeling. Since None of the other answers suit the description of "overstressed", it would be 4.
irritable
Explanation:
irrtable meaning Easily annoyed or easily made mad
If x=450 mm, determine the mass of the counterweight s required to balance a 90-kg load
Answers
The mass of the counterweight required to balance the 90-kg load is also 90 kg.
To balance the 90-kg load, the moment created by the counterweight s must equal the moment created by the load. The moment created by a force is equal to the force multiplied by the perpendicular distance from the force to the point of rotation. In this case, the point of rotation is the fulcrum and the perpendicular distance is the distance between the fulcrum and the force.
Let's assume that the distance between the fulcrum and the load is d, and the distance between the fulcrum and the counterweight is x. We can then write the equation:
mass of counterweight x distance to fulcrum = mass of load x distance to fulcrum
m_s x x = 90 kg x d
We are given that x = 450 mm (0.45 m). Solving for m_s, we get:
m_s = (90 kg x d) / x
We need to determine the value of d in order to calculate the mass of the counterweight. Since the system is in balance, we know that the sum of the moments created by the load and the counterweight must be zero. That is:
mass of load x distance to fulcrum = mass of counterweight x distance to fulcrum
90 kg x d = m_s x (x + d)
Substituting the expression we derived earlier for m_s, we get:
90 kg x d = [(90 kg x d) / x] x (x + d)
Simplifying this expression by cancelling out the factor of d on both sides, we get:
90 kg = (90 kg / x) x (x + d)
Multiplying both sides by x, we get:
90 kg x = 90 kg x (x + d)
Cancelling out the factor of 90 kg, we get:
x = x + d
Solving for d, we get:
d = x = 450 mm = 0.45 m
Now we can use the equation we derived earlier for m_s to calculate the mass of the counterweight:
m_s = (90 kg x 0.45 m) / 0.45 m = 90 kg.
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a sound wave takes 6 seconds to complete one cycle. what is the frequency of this wave
Answers
Therefore, the frequency of the sound wave is 0.1667 Hz.
How lengthy is a wave at 20 Hz?Since we can fit 20 cycles into a distance of 340 meters, the wavelength for 20 Hz is equal to 340 metres divided by 20, or 17 metres. The wavelength is described as the length of this pattern for one cycle.
The quantity of cycles per second is used to describe a wave's frequency. The sound wave in this instance goes through one rotation in 6 seconds.
So the frequency of the wave can be calculated as:
Frequency = 1 / Time period
where Time period is the time taken to complete one cycle.
Therefore, the frequency of the sound wave can be calculated as:
Frequency = 1 / 6 seconds = 0.1667 Hz
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Need help on this question!!!
True or False. Animals can be at the top of more than one food chain.
Answers
Answer:
false
Explanation:
Can animals be at the top of more than one food chain? There cannot be too many links in a single food chain because the animals at the end of the chain would not get enough food (and hence, energy) to stay alive.
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to 11 REarth before coming to rest momentarily?
Answers
the launch speed of the projectile is approximately 12.3 km/s that rises vertically above the Earth to an altitude equal to 11 REarth before coming to rest momentarily
We can use the conservation of energy principle to solve this problem. At the highest point, the projectile has zero kinetic energy and a certain potential energy, given by:
PE = mgh
where m is the mass of the projectile, g is the acceleration due to gravity, and h is the altitude above the Earth's surface. The potential energy can also be expressed in terms of the gravitational potential energy per unit mass, which is given by:
U = GM/r
where M is the mass of the Earth, r is the distance from the center of the Earth to the projectile, and G is the gravitational constant. At the highest point, the projectile has a distance of 12 REarth from the center of the Earth (11 REarth above the surface plus the radius of the Earth).
Setting these two expressions for potential energy equal to each other, we have:
mgh = GMm/r
where we can cancel the mass m from both sides to obtain:
gh = GM/r
Solving for the speed v at the launch point, we have:
v = sqrt(2gh)
where we can substitute:
h = 11 REarth
r = 12 REarth
g = GM/(12 REarth)2
Substituting these values and using the fact that REarth = 6.37×106 m, we get:
v = sqrt(2×(11+1)REarth×GM/(12REarth)) = 12.3 km/s
where we used the fact that the total distance traveled by the projectile is 2 REarth, so the factor of (11+1) appears in the expression for h.
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Dump Tower is 90 stories tall. A small, 1.5-kg object is dropped over the side of the roof of the tower and accelerates toward the ground. You will track the object for its entire fall. Each story of this tower is 3.85 meters tall.
What is the acceleration due to gravity of the planet and what is the impact speed of the object you dropped?
Time of fall 8.50sec.
30pts.
Thanks!
Answers
The distance the object falls is equal to the height of the building, which is 90 x 3.85 = 346.5 meters.
The acceleration due to gravity can be found using the equation:
d = 1/2 * g * t^2
where d is the distance the object falls, t is the time of fall, and g is the acceleration due to gravity.
Substituting the known values:
346.5 meters = 1/2 * g * (8.50 seconds)^2
Solving for g:
g = 2 * 346.5 meters / (8.50 seconds)^2
g = 9.74 m/s^2
So the acceleration due to gravity on the planet is 9.74 m/s^2.
The impact speed of the object can be found using the equation:
v = g * t
where v is the impact speed and t is the time of fall.
Substituting the known values:
v = 9.74 m/s^2 * 8.50 seconds
v = 82.8 m/s
So, the impact speed of the object is 82.8 m/s.
An object A has a mass of 6kg and a heat capacity of 2 310j/°C. Another object B has a mass of 4.6kg and a heat capacity of 1771j/°C. Determine if the two objects A and B are made from the same substance.
Answers
We can infer that item A is not composed of the same material as object B since its specific heat capacity is higher than object B's. As the specific heat capacities differ, we cannot assume that they are the same.
Determine if the two objects A and B are made from the same substance.The amount of heat needed to increase the warmth of one unit of mass of a substance by one degrees Celsius must be compared between two things in order to ascertain if they are made of the same material. The compounds are probably the same if the heat capacity capacities are the same. The following equation can be used to determine how much heat energy is needed to raise an object's temperature:
Q = mcΔT
Where Q is the heat received or released, m is the object's mass, c is the material's specific heat capacity, and T is the temperature change.
Let's figure out how much heat energy is needed to raise item A's temperature by one degree Celsius:
Q A = mcΔT
Q A equals 6 kg x 2,310 J/(kg°C) x 1°C.
Q A = 13,860 J/°C
Let's now determine how much heat energy is needed to raise item B's temperature by 1 degree Centigrade:
Q B = mcΔT
Q B is equal to 4.6 kg, 1,771 J/(kg°C), and 1°C.
Q B = 8,146.6 J/°C
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(a)
Calculate the force (in N) needed to bring a 900 kg car to rest from a speed of 85.0 km/h in a distance of 110 m (a fairly typical distance for a non-panic stop).
(b)
Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a).
Answers
f = (m * v^2) / (2 * d)
where:
m = 900 kg (mass of the car)
v = 85.0 km/h = 23.6 m/s (initial velocity of the car)
d = 110 m (stopping distance)
Plugging in the values, we get:
f = (900 kg * (23.6 m/s)^2) / (2 * 110 m)
f = 23095.91 N or 2.31 x 10^4 N
Therefore, the force needed to bring the car to rest from a speed of 85.0 km/h in a distance of 110 m is approximately 23,095.91 N or 23.1 kN.
(b) If the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m, we can calculate the force exerted on the car using the formula:
f = m * a
where:
m = 900 kg (mass of the car)
a = -v^2 / (2 * d) = -(23.6 m/s)^2 / (2 * 2.00 m) = -2793.2 m/s^2 (acceleration of the car)
The negative sign indicates that the acceleration is in the opposite direction to the initial velocity of the car.
Plugging in the values, we get:
f = 900 kg * (-2793.2 m/s^2)
f = -2.51 x 10^6 N or -2.51 MN
Therefore, the force exerted on the car when it hits a concrete abutment at full speed and is brought to a stop in 2.00 m is approximately 2.51 MN (or 2510 kN), which is much greater than the force found in part (a). This is because the stopping distance is much shorter, so the deceleration (and therefore the force) must be much greater to bring the car to a stop in the same amount of time.
Four plotting compasses are placed near a bar magnet. Which plotting compass is shown pointing in the correct direction?
Answers
The direction of the north pole of a compass needle represents the direction of magnetic field lines. Magnetic field lines originate from the north pole of magnet and terminate at south pole. Hence, the correct compass will be A.
What is a plotting compass?A plotting compass is also known as a magnetic compass. It aligns itself with the magnetic field of magnet, with north-seeking end of the compass pointing towards the south pole of the magnet and the south-seeking end pointing towards the north pole of the magnet.
So, to determine which plotting compass is pointing in the correct direction, you would need to observe the direction in which the north-seeking end of the compass is pointing and compare it to the direction in which the south pole of the bar magnet is located. If the north-seeking end of the compass is pointing towards the south pole of the magnet, then the compass is pointing in the correct direction.
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If two people disagree on metaethics, they will definitely disagree on the best
outcome of a particular ethical issue such as abortion.
Answers
False. Because metaethics is concerned with the nature of ethics and moral reasoning.
What is metaethics?Metaethics is concerned with the nature of ethics and moral reasoning, while normative ethics is concerned with specific ethical principles and the best course of action in particular ethical issues.
Disagreement on metaethics does not necessarily mean that two people will disagree on the best outcome of a particular ethical issue such as abortion. It is possible for two people with different metaethical views to agree on the best course of action in a particular ethical issue, as long as they share similar normative ethical principles or have similar views on the relevant facts of the situation.
However, differences in metaethics may lead to differences in how one arrives at their normative ethical principles, which may in turn affect their view on the best outcome of a particular ethical issue.
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As a beam of light enters a swimming pool, it will because light waves when they pass from one medium to a different medium.
Answers
Light waves will be refracted, or bent, as they move from air to the denser medium of water.
The refraction can cause the light to spread out and become distorted, resulting in a blurry and distorted image.When a beam of light enters a swimming pool, it will cause light waves to bend and refract when they pass from the less dense medium of air to the denser medium of water.
This is due to the different densities of the two mediums, which causes the light waves to bend as they move from one to the other. As a result, the light waves become distorted and spread out, causing a blurry and distorted image.
This phenomenon is known as refraction, and it happens when light passes through any medium that is denser than the one it is coming from. It's why we can see objects underwater, as the light waves get bent and refracted as they pass through the water. Refraction is an important part of many optical phenomena, such as lenses and prisms, which use it to bend and shape light.
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What force is required to stop a 1800-kg car in a distance of 0.20 m if it is initially moving at 2.2 m/s? What if the car is moving at 4.5 m/s
Answers
The formula for the force required to stop the automobile is F = m x a, where m = 1200 kg and F = 1200 x (-12.5) N = - 15000 N.
What force does an automobile need to stop?As a car brakes, the rotating wheels create friction inside the wheel assemblies, bringing the vehicle to a stop. The kinetic energy of the automobile is lost as heat in the braking components due to this friction force, which slows the spinning of the wheels.
The automobile can come to a stop with any force higher than zero. The only difference is that it will take longer and cover a bigger distance before stopping.
Unless a force acts on a body, it stays at rest or moves in a straight path at a constant speed.
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