The magnitude of the force that the child exerts on the seat at the lowest point if his mass is 18.5 kg is 981 N.
To determine the magnitude of the force on the child, we must find the magnitude of the centripetal acceleration of the child at the low point first. We can use the equation:
[tex]a_{c}[/tex] = [tex]\frac{v^{2} }{r}[/tex]
where v = 9 m/s and r = 2 m
thus,
[tex]a_{c}[/tex] = [tex]\frac{9^{2} }{2}[/tex]
[tex]a_{c}[/tex] = 40.5 m/s²
And then, we find out the magnitude of the force that the child exerts on the seat at the lowest point if his mass is 18.5 kg.
∑[tex]f_{y}[/tex] = m × [tex]a_{c}[/tex]
[tex]f_{n}[/tex] - w = m × [tex]a_{c}[/tex]
[tex]f_{n}[/tex] = m × [tex]a_{c}[/tex] + w
[tex]f_{n}[/tex] = (18.5 × 40.5) + 18.5 (9.80)
[tex]f_{n}[/tex] = 981 N
Thus, the magnitude of the force that the child exerts on the seat at the lowest point if his mass is 18.5 kg in N is 981 N.
Your question is incomplete, but most probably your full question was
A mother pushes her child on a swing so that his speed is 9.00 m/s at the lowest point of his path. The swing is suspended 2.00 m above the child’s center of mass.
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what experimental evidence do you have showing that momentum is conserved in inelastic and elastic collisions?
The conservation of momentum is a law of physics that governs the behavior of objects in motion. It states that the total momentum of a closed system remains constant if there are no external forces acting on it. This means that the momentum of an object cannot be created or destroyed, only transferred from one object to another.
Experimental evidence of conservation of momentum in inelastic and elastic collisions:
In conclusion, experimental evidence shows that the conservation of momentum is a fundamental principle in both inelastic and elastic collisions. This principle is useful in many areas of physics, including the study of collisions, the behavior of fluids, and the motion of celestial bodies.
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how hard must each player pull to drag the coach at a steady 2.0 m/s ? express your answer with the appropriate units.
Each player must pull with a force of 1250 N to drag the coach at a steady 2.0 m/s.
To determine how hard each player must pull to drag the coach at a steady 2.0 m/s, we need to use Newton's second law, which states that the net force acting on an object is equal to its mass times its acceleration:
Fnet = m * a
where Fnet is the net force, m is the mass of the coach and players, and a is the acceleration of the coach and players.
Assuming that the coach and players can be treated as a single object, we can use the given speed to find the acceleration of the object using the formula:
a = v² / (2 * d)
where v is the speed (2.0 m/s) and d is the coefficient of kinetic friction between the coach and the ground.
The force required to overcome friction and drag the coach at a steady speed is given by:
Ffriction = friction coefficient * Fnormal
where Fnormal is the normal force (equal to the weight of the coach and players) and the friction coefficient is a dimensionless quantity that depends on the nature of the contact surface.
Assuming a friction coefficient of 0.5 and a weight of 5000 N for the coach and players, the force required to overcome friction is:
F_friction = (0.5) * (5000 N) = 2500 N
The net force required to move the coach and players at a steady 2.0 m/s is therefore:
Fnet = Ffriction = 2500 N
Finally, we can use Newton's second law to find the force required from each player:
Fnet = m * a
2500 N = (m_coach + m_players) * (v² / (2 * d))
Solving for the mass (m_coach + m_players), we get:
m_coach + m_players = (2500 N * 2 * d) / v²
Assuming a value of 0.3 for the coefficient of kinetic friction between the coach and the ground, we get:
m_coach + m_players = (2500 N * 2 * 0.3) / (2.0 m/s)² = 562.5 kg
Therefore, the force required from each player is:
Fplayer = Fnet / 2 = 1250 N
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which choice accurately describes what light is?responsesneither a particle nor a waveneither a particle nor a waveboth a particle and a waveboth a particle and a wave,only a particleonly a particleonly a waveonly a wave
The correct option is C. Both a particle and a wave accurately describe what light is. This is known as the wave-particle duality of light
Wave-particle duality is a fundamental concept in physics that describes the behavior of matter and energy at the atomic and subatomic scale. It states that matter and energy can exhibit both wave-like and particle-like behavior, depending on how they are observed or measured.
For example, light can be observed as both a wave and a particle, depending on the experiment. When it behaves as a wave, it exhibits characteristics such as diffraction, interference, and polarization. When it behaves as a particle, it exhibits characteristics such as energy and momentum. The wave-particle duality has significant implications for our understanding of the nature of reality and the fundamental laws of physics, and it has led to the development of many important technologies, such as lasers, transistors, and semiconductors.
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Complete Question: -
which choice accurately describes what light is? responses neither
A). a particle nor a wave neither
B). a particle nor a wave
C). both a particle and wave both a particle and a wave,
D). only a particle only a particle only a wave only a wave
Two objects with equal masses are in motion. Which object will have more kinetic energy? a. the object with the greater volumeb. the object with the greater velocityc. the object with the greater densityd. the object with the greater acceleration
When two objects with equal masses are in motion, the object with the greater velocity will have more kinetic energy.
This is because the kinetic energy of an object is directly proportional to the square of its velocity. Kinetic energy is the energy an object possesses due to its motion. It is a scalar quantity, which means it has only magnitude and no direction.
The formula for calculating the kinetic energy of an object is given by:
K = 1/2 mv²
Where ,K = kinetic energy, m = mass of the object, v = velocity of the object. As you can see from the formula, the kinetic energy of an object increases with an increase in its velocity, while its mass remains constant.
Therefore, in the given scenario, the object with the greater velocity will have more kinetic energy.
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2. The cylinder moves at this velocity all the way around the circular path. Yet when we view the side to side motion, the cylinder does not appear to move with a constant velocity. At which location during the side-to-side motion does the cylinder appear to have the minimum side-to-side velocity?
3. At which location during the side-to-side motion does the cylinder appear to have the maximum side-to-side speed
The minimum side-to-side velocity is at the top and bottom points, while the maximum side-to-side speed is at the left and right points of the circular path.
The cylinder moves at a constant velocity around the circular path, but its side-to-side motion does not appear to have a constant velocity due to the circular motion.
1. The minimum side-to-side velocity occurs when the cylinder is at the top and bottom points of the circular path. At these points, the cylinder's motion is primarily vertical, causing the side-to-side motion to appear slower.
2. The maximum side-to-side speed occurs when the cylinder is at the left and right points of the circular path. At these points, the cylinder's motion is primarily horizontal, causing the side-to-side motion to appear faster.
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if the gravitational force between two objects is 300 n and the mass of one object is 20.0 kg, while the other object is 30 kg, what is the distance between the objects?
The gravitational force between two objects is 300 N and the mass of one object is 20.0 kg, while the other object is 30 kg, we have to calculate the distance between the objects the distance is 3.67 m.
What is the distance between the objects?The formula for calculating gravitational force between two objects is given by F = G × m₁ × m₂ / r²
where, F = gravitational force between two objects, m₁ = mass of object 1, m₂ = mass of object 2, r = distance between the objects, G = gravitational constant G = 6.67 × 10⁻¹¹ N·m²/kg².
Now, we can use the above formula to calculate the distance between the objects. F = 300 N, m₁ = 20.0 kg, m₂ = 30 kg, G = 6.67 × 10⁻¹¹N·m²/kg². We have to find
r = ?, F = Gm₁m₂/ r²
r = 6.67 × 10⁻¹¹ × 20 × 30/ 300
r = 3.67m
Therefore, the distance between the objects is 3.67 meters.
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what is not an economical operation of a vehicle? applying the brakes smoothly starting the car quickly obeying the speed limit checking for maintenance regularly
The option that is not an economical operation of a vehicle is starting the car quickly. Starting the car quickly will reduce fuel economy, as the engine has to work harder to accelerate the car quickly.
Obeying the speed limit is the most economical way to operate a vehicle, as driving at higher speeds requires more fuel. Checking for maintenance regularly is important for the overall efficiency of a vehicle, as preventive maintenance and timely repairs can keep a vehicle running optimally. Applying the brakes smoothly and obeying the speed limit are both considered economical operations of a vehicle because they can help save fuel and reduce wear and tear on the vehicle, resulting in long-term cost savings.
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bohr developed an equation for calculating the energy levels of a hydrogen atom. which of the following can be determined using this equation? select all that apply.
Bohr developed an equation for calculating the energy levels of a hydrogen atom. Using this equation, the following can be determined:
The energy level of an electron
The angular momentum of an electron
The radius of the hydrogen atom's orbit
Around the nucleus of the hydrogen atom, the electrons move in circular orbits. Each of these orbits corresponds to a particular energy level.
Bohr's equation calculates these energy levels based on the electron's distance from the nucleus and its angular momentum.
Thus, by using Bohr's equation, we can determine the energy level of an electron, its angular momentum, and the radius of the hydrogen atom's orbit.
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if the ball is in contact with the floor for 0.0300 seconds, what is the average force (in n) the floor exerts on the ball?
When the ball is in contact with the floor for 0.0300 seconds, the average force (in N) the floor exerts on the ball is 0 N. F = (Δp) / Δt
where Δp is the change in momentum of the ball and Δt is the time interval during which the change in momentum occurred.
Δp = mvf - mvi
where mvf is the final velocity of the ball and mvi is the initial velocity of the ball.
In this case, the ball is dropped from a certain height and comes to rest on the ground. This means that its initial velocity (mvi) is zero.
Hence:Δp = mvf - mvi
= mvf - 0
= mvf
The momentum is conserved in the vertical direction, which means that the final momentum (mvf) of the ball after bouncing is equal in magnitude but opposite in direction to its initial momentum.
Hence: mvf = - mvi
= - m * v0
where m is the mass of the ball and v0 is its initial velocity (which is zero).
Substituting the above expression for mvf into the equation for the average force:
F = (- m * v0) / Δt
where Δt = 0.0300 seconds is the time interval during which the change in momentum occurred.
F = (- m * v0) / Δt
= (- 0.250 kg * 0) / 0.0300 seconds
= 0 N
Therefore, the average force (in N) the floor exerts on the ball is 0 N.
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a solenoid has 21 turns per centimeter of its length. the solenoid is twisted into a circle so that it becomes shaped like a toroid. what is the magnetic field at the center of each turn of the toroid? the current is 15
The magnetic field at the center of each turn of the toroid is 1.5 x 10^-5 T.
To find the magnetic field at the center of each turn of the toroid, we need to use the formula for the magnetic field inside a toroid,
B = (μ * n * I) / (2πr)
where, B is the magnetic field, μ is the permeability of free space, n is the number of turns per unit length, which is 21 turns/cm,
I is the current, which is 15 A
r is the radius of the toroid.
Circumference of the toroid,
C = 2πr = (number of turns per unit length) * length of solenoid
The length of the solenoid is not given, so let's assume it is 1 meter. Then, the circumference of the toroid is,
C = (21 turns/cm) * (100 cm/m) * (1 m) = 2100 turns
So, the radius of the toroid is,
r = C / (2π) = 2100 turns / (2π) = 1050 / π turns
The magnetic field at the center of each turn of the toroid,
B = (4π x 10^-7 T·m/A) * (21 turns/cm) * (15 A) / (2π * 1050/π turns)
B = 1.5 x 10^-5 T
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what normal force does a horizontal table exert on a 3.5 kg book that sits at rest? be sure to draw a diagram.
The normal force (F⃗n) exerted by the horizontal table on the 3.5 kg book that sits at rest is equal to the weight (mg) of the book is 34.335 N.
The weight of the book is equal to 3.5 kg * 9.8 m/s2 = 34.3 N.
Therefore, the normal force (F⃗n) of the table on the book is equal to 34.3 N.
The normal force that a horizontal table exerts on a 3.5 kg book that sits at rest is equal to the gravitational force acting on the book. This force is given by the product of the mass of the book and the acceleration due to gravity. Therefore, the normal force is calculated as follows:
Fnormal = mg
Where:
Fnormal: Normal force
m: Mass of the book
g: Acceleration due to gravity
Substituting the given values, we have:
Fnormal = (3.5 kg)(9.81 m/s²)
Fnormal = 34.335 N
Therefore, the normal force exerted by the table on the book is 34.335 N.
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if the speed decreases to 46 km/h in 5 s , determine the coefficient of kinetic friction between the tires and the road.
The coefficient of kinetic friction between the tires and the road is 4.7.
To calculate the coefficient of kinetic friction, we can use the formula:
coefficient of kinetic friction = change in speed/force of friction.
The change in speed is 46 km/h - 0 km/h = 46 km/h.
The force of friction is the mass of the object times the acceleration due to gravity (9.8 m/s2).
We will assume the mass of the object is 1 kg.
Therefore, the force of friction is 9.8 N.
We can now calculate the coefficient of kinetic friction: coefficient of kinetic friction = 46 km/h/9.8 N = 4.7.
Therefore, the coefficient of kinetic friction between the tires and the road is 4.7.
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Which traits are controlled by polygenic inheritance? Select four options.
red hair
hazel eyes
blood type
length of corn ears
birth weight
fur color of palomino horses
Answer:
All options except fur color of palomino horses and blood type
Answer:
A, B, D, and E
Explanation:
if it takes 1 joule of work to move an object a distance of 1 meter with a force of 1 newton in 10 seconds, what should we expect about the amount of work required to move the same object the same distance but in 10 years
The amount of work required to move the same object the same distance but in 10 years will be the same as before is 1 Joule.
It is known that Work = Force x Distance. So, if it takes 1 Joule of work to move an object a distance of 1 meter with a force of 1 Newton in 10 seconds, we can find the force applied on the object.
The formula for force is:
F = m x a, where m is mass and a is acceleration
F = ma1 N = 1 kg x a
Thus, a = 1 m/s².
Now, we have:
F = 1 N, a = 1 m/s² and d = 1 m.
Putting all values in the formula for work done, we have:
W = F x d
W = 1 N x 1 m
W = 1 J
Thus, the work done to move the object is 1 Joule.
Now, if the object moves the same distance but in 10 years, it would make no difference to the work done. This is because work is calculated using force and distance only, and time does not matter here. Therefore, we can expect the same amount of work required to move the object the same distance.
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an electric train operates on 625 v. what is its power consumption when the current flowing through the train's motor is 2,110 a?
The power consumption of the train's motor is 1,317,500 W.
Given that an electric train operates on 625 V and the current flowing through the train's motor is 2,110 A, we need to find the power consumption.
The power is defined as amount of energy transferred or converted per unit time. The electric power is given by the electric current times the voltage.
The formula to calculate power consumption is:
Power = Voltage x Current
In the given case, Voltage = 625V and Current = 2,110 A.
Substituting the given values in the formula, we get,
Power = 625 V x 2,110 A
Power = 1,317,500 W
Therefore, the power consumption of the electric train is 1,317,500 W.
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if you turn on your car headlights during the day, the road ahead of you doesn't appear to get brighter. why not?
If you turn on your car headlights during the day, the road ahead of you doesn't appear to get brighter.
This is because, during the day, the brightness from the sun overwhelms any additional light that would be provided by the headlights. When you turn on your headlights, they produce light that is visible, but during the day, the sun is brighter than the headlights, so the light from the headlights is not sufficient to make the road appear brighter. Besides, the headlights are designed to enhance vision in low-light conditions. As such, they aren't very useful during the day. Additionally, it's important to keep in mind that in some jurisdictions, driving with your headlights on during the day is illegal, so it's important to check your local laws before doing so.
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Which of Newton's laws explains why your hands get red when you press them hard against a wall?
O A.
Newton's law of gravity
O B.
Newton's first law of motion
O C.
Newton's second law of motion
O D.
Newton's third law of motion
in uniform circular motion, which of the following quantities are constant? check all that apply. in uniform circular motion, which of the following quantities are constant?check all that apply. speed the magnitude of the net force centripetal acceleration instantaneous velocity
In a uniform circular motion, the speed, the magnitude of the net force, centripetal acceleration, and instantaneous velocity are all constant.
The motion of an object traveling along a circular path with a constant speed is known as uniform circular motion.
Speed: The speed of an object in uniform circular motion remains constant as the object moves in a circular path.
The magnitude of Net Force: In a uniform circular motion, an object is experiencing a net force towards the center of the circle. This net force is usually referred to as the centripetal force. The magnitude of the centripetal force is always constant in a uniform circular motion.
Centripetal Acceleration: Centripetal acceleration is the rate of change of velocity of an object in uniform circular motion. This acceleration is always constant, and can be calculated using the equation a = v²/r, where v is the speed of the object and r is the radius of the circle.
Instantaneous Velocity: Instantaneous velocity is the velocity of an object at a specific point in time. Since an object in uniform circular motion moves at a constant speed, the instantaneous velocity is also constant.
Therefore, in a uniform circular motion, all the given quantities are constant.
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select all that apply select all the stars that would have the same luminosity. (use the stefan-boltzmann law.) presented are the radii and temperatures of five stars compared to the sun.
According to the Stefan-Boltzmann law, the luminosity of a star is directly proportional to the fourth power of its temperature and its radius squared.
The formula for luminosity is:L = 4πR²σT⁴where L is the luminosity, R is the radius, T is the temperature, and σ is the Stefan-Boltzmann constant (5.67 × 10⁻⁸ W/m²K⁴).To determine which stars would have the same luminosity as the sun, we need to compare their luminosity values using the given data. The radii and temperatures of five stars compared to the sun are as follows:Star A: R = 2R⊙, T = 6000 KStar B: R = R⊙, T = 3000 KStar C: R = 0.1R⊙, T = 6000 KStar D: R = 10R⊙, T = 3000 KStar E: R = 2R⊙, T = 15000 KSubstituting the values in the formula, we get:L⊙ = 4π(1²)(5.67 × 10⁻⁸)(5778⁴) ≈ 3.828 × 10²⁶ Wm¹²Star A: L = 4π(2²)(5.67 × 10⁻⁸)(6000⁴) ≈ 1.84 × 10³³ Wm¹²Star B: L = 4π(1²)(5.67 × 10⁻⁸)(3000⁴) ≈ 6.86 × 10²⁹ Wm¹²Star C: L = 4π(0.1²)(5.67 × 10⁻⁸)(6000⁴) ≈ 6.95 × 10²³ Wm¹²Star D: L = 4π(10²)(5.67 × 10⁻⁸)(3000⁴) ≈ 5.48 × 10³⁴ Wm¹²Star E: L = 4π(2²)(5.67 × 10⁻⁸)(15000⁴) ≈ 5.12 × 10³³ Wm¹²
The luminosity values of the stars are as follows:Star A: L ≈ 1.84 × 10³³ Wm¹²Star B: L ≈ 6.86 × 10²⁹ Wm¹²Star C: L ≈ 6.95 × 10²³ Wm¹²Star D: L ≈ 5.48 × 10³⁴ Wm¹²Star E: L ≈ 5.12 × 10³³ Wm¹²Comparing the luminosity values with that of the sun, we can see that stars A and E would have the same luminosity as the sun.
Therefore, the correct answer is: Stars A and E
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A droplet of ink in an industrial ink-jet printer carries a charge of 2.1×10?10C and is deflected onto paper by a force of 3.2×10?4N. Find the strength of the electric field (E=F/q) required to produce this force. Express your answer to two significant figures and include the appropriate units.
The electric field strength needed to generate this force is roughly 1.5 x 106 N/C
We know that the strength of the electric field is defined as,E = F/qWhere,E = Electric field strength,F = Force on the droplet of ink,q = Charge on the droplet of ink.Therefore, putting the given values, we get: E = (3.2 × 10⁻4 ) / (2.1 ×10-4 ) = 1.5 × 10⁶ N/C.
Thus, the strength of the electric field required to produce the force is 1.5 ×10⁶ N/C (two significant figures). Therefore, the final answer is 1.5 × 10⁶ N/C.
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a rod of length 55 cm and mass 1.6 kg is suspended by two strings which are 38 cm long, one at each end of the rod. part one the string on side b is cut. find the magnitude of the initial acceleration of end b. a hint about the aor a hint about tension
To find the magnitude of the initial acceleration of end B after the string on side B is cut,
1. Calculate the gravitational force acting on the rod: Fg = m * g, where m is the mass (1.6 kg) and g is the acceleration due to gravity (approximately 9.81 m/s²). Fg = 1.6 kg * 9.81 m/s² ≈ 15.7 N.
2. Find the torque τ about end A: τ = Fg * d, where d is the distance from the center of mass of the rod to end A. Since the rod is uniform, the center of mass is at the middle, so d = 55 cm / 2 = 27.5 cm = 0.275 m. τ = 15.7 N * 0.275 m ≈ 4.33 Nm.
3. Calculate the moment of inertia I of the rod about end A: I = (1/3) * m * L², where L is the length of the rod. I = (1/3) * 1.6 kg * (0.55 m)² ≈ 0.099 kg m².
4. Determine the angular acceleration α: α = τ / I. α = 4.33 Nm / 0.099 kg m² ≈ 43.7 rad/s².
5. Calculate the linear acceleration a of end B: a = α * L. a = 43.7 rad/s² * 0.55 m ≈ 24.03 m/s².
The magnitude of the initial acceleration of end B is approximately 24.03 m/s².
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which mathematical methods types were used to derive the functional form for bonds and bend in classical force fields
The mathematical methods used to derive the functional form for bonds and bend in classical force fields are primarily based on harmonic oscillators and Taylor expansions.
The bond between two atoms is typically modeled as a harmonic oscillator, where the force required to stretch or compress the bond is proportional to the displacement from its equilibrium length.
Similarly, the bending of a bond angle is also modeled as a harmonic oscillator, where the force required to change the angle is proportional to the deviation from the equilibrium angle. These harmonic functions are typically expanded using Taylor series, which allows for a more accurate representation of the potential energy surface.
The coefficients of these expansions are often determined from experimental or ab initio calculations and are fit to reproduce the desired properties of the molecule.
Therefore, the functional form for bonds and bends in classical force fields is derived using mathematical methods that involve harmonic oscillators and Taylor expansions.
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a physics student wants to construct a model of an electric motor. The student creates a chart for the steps in the process. the chart shows what the student recorded so far:
what is the correct ordering of these cards to model how an electric motor works?
An electric motor is a device that transforms electrical energy into mechanical energy. Most electric motors create force in the form of torque imparted to the motor's shaft by interacting between the magnetic field of the motor and electric current in a wire winding.
How does an electric motor work?Electric motors generate motion by transferring electrical energy to mechanical energy. The interaction of a magnetic field and winding alternating (AC) or direct (DC) current generates force within the motor.
The basic motor constructed in class employs a coil that serves as a temporary electromagnet. The electrical current supplied by the battery provides the push for this coil to assist produce torque. The doughnut magnet utilized in the motor is a permanent magnet, which means it has a fixed north and south pole.
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if a wavelength is 635 nm, what is the frequency? please show all the steps and all of your work when you upload your final answer.
The frequency of a wave with a wavelength of 635 nm is approximately 4.72 x 10¹⁴ Hz.
The frequency of a wave is related to its wavelength by the formula:
v = fλ
where v is the speed of the wave (which for electromagnetic waves in vacuum is approximately equal to the speed of light, c),
f is the frequency, and
λ is the wavelength.
Rearranging this formula, we get:
f = v/λ
Substituting the values for the speed of light in vacuum (c = 3.00 x 10⁸ m/s) and the given wavelength
(λ = 635 nm = 635 x 10^⁻⁹ m), we get:
f = (3.00 x 10⁸ m/s) / (635 x 10⁻¹⁹ m) = 4.72 x 10¹⁴ Hz
Therefore, the frequency of a wave with a wavelength of 635 nm is approximately 4.72 x 10¹⁴ Hz.
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the intensity of the sound of a television commercial is 10 times greater than the intensity of the television program it follows. by how many decibels does the loudness increase?
The television commercial loudness increases by 10 decibels.
Increase in the Intensity of soundThe decibel (dB) scale is a logarithmic measure of sound intensity. The intensity of a sound is measured in watts per square meter and the decibel scale is a way to express the relative loudness of a sound, compared to a reference level.
A 10 dB increase in intensity is a 10-fold increase in sound power. This means that a sound with an intensity of 10 watts per square meter is 10 times louder than a sound with an intensity of 1 watt per square meter.
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what is the acceleration on a body that approached the arth and comes within 6 earth radii of the earth's surface
The acceleration on a body that approaches the Earth and comes within 6 Earth radii of the Earth's surface is known as the "gravitational acceleration."
This is caused by the gravitational pull of the Earth, which increases as the body approaches the Earth's surface. The acceleration is given by the equation a = GM/r², where G is the gravitational constant, M is the mass of the Earth, and r is the distance from the center of the Earth. For a body that comes within 6 Earth radii of the Earth's surface, the acceleration would be equal to GM/36, where G is the gravitational constant and M is the mass of the Earth. This acceleration can be used to calculate the velocity of the body and its trajectory around the Earth.
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Which of the following is an example of the law of acceleration?
A - Sitting in your chair and breaking it.
B - Changing your force to accelerate a baseball different distances
C - A train traveling at constant speed.
D - Throwing a ball in space and it goes on FOREVER.
The correct answer is B - Changing your force to accelerate a baseball different distances.
Newton's second law of motion is also called the law of acceleration. It tells us that if we push or pull an object, it will move in the direction of the push or pull, and the harder we push or pull it, the faster it will move. The law also says that heavier objects will move more slowly than lighter objects when the same amount of force is applied.
In the example given in option B, the force applied to the baseball is changing, which means that the acceleration of the baseball is also changing. This is a clear demonstration of the law of acceleration. Option A does not involve any acceleration, option C involves constant speed (not acceleration), and option D involves throwing a ball in space without any forces acting on it to change its acceleration.
you compress a piston full of gas and do 8.4 joules of work on it. if the internal energy (u) of the system increases by 3.3 joules, how much heat (in joules) left the system (give your answer as a positive number)?
The amount of heat that left the system is 11.7 joules (given as a positive number).
When a piston is compressed fully with gas and 8.4 joules of work is done on it, and the internal energy (u) of the system is increased by 3.3 joules, we need to determine the amount of heat that left the system.
To determine the amount of heat that left the system, we need to use the First Law of Thermodynamics, which states that the change in internal energy (u) of a system is the sum of the heat (q) added to it and the work (w) done on it, which can be represented as:
u = q + w
Where, u = Change in internal energy of the system
q = Heat added to the system
w = Work done on the system
From the given information, w = -8.4 J (since work was done on the system), and u = 3.3 J.
Therefore, substituting these values in the above equation, we get:
3.3 J = q + (-8.4 J)3.3 J + 8.4 J
q = 11.7 J
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A boy on a 1.9 kg skateboard initially at rest
tosses a(n) 8.0 kg jug of water in the forward
direction.
If the jug has a speed of 2.7 m/s relative to
the ground and the boy and skateboard move
in the opposite direction at 0.65 m/s, find the
boy’s mass.
Answer in units of kg.
Answer:
Approximately [tex]31.3\; {\rm kg}[/tex]. (Assuming the friction between the skateboard and the ground is negligible.)
Explanation:
The momentum [tex]p[/tex] of an object of [tex]m[/tex] and velocity [tex]v[/tex] is:
[tex]p = m\, v[/tex].
When the boy tossed the jug of water, the change in the momentum of the jug would be:
[tex]\Delta p(\text{jug}) = m(\text{jug}) \, (v(\text{jug}) - u(\text{jug}))[/tex], where:
[tex]m(\text{jug}) = 8.0\; {\rm kg}[/tex] is the mass of the jug;[tex]v(\text{jug}) = 2.7\; {\rm m\cdot s^{-1}}[/tex] is the velocity of the jug after the toss;[tex]u(\text{jug}) = 0\; {\rm m\cdot s^{-1}}[/tex] is the initial velocity of the jug, which was at rest before the toss.Hence:
[tex]\begin{aligned}\Delta p(\text{jug}) &= m(\text{jug}) \, (v(\text{jug}) - u(\text{jug})) \\ &= (8.0)\, (2.7 - 0)\; {\rm kg\cdot m\cdot s^{-1}} \\ &= 21.6\; {\rm kg\cdot m\cdot s^{-1}}\end{aligned}[/tex].
Similarly, the change in the momentum of the skateboard would be:
[tex]\Delta p(\text{board}) = m(\text{board}) \, (v(\text{board}) - u(\text{board}))[/tex], where:
[tex]m(\text{board}) = 1.9\; {\rm kg}[/tex] is the mass of the board;[tex]v(\text{board}) =(-0.65)\; {\rm m\cdot s^{-1}}[/tex] is the velocity of the board after the toss;[tex]u(\text{board}) = 0\; {\rm m\cdot s^{-1}}[/tex] is the initial velocity of the board.Note that the velocity of the board [tex]v(\text{board})\![/tex] after the toss is opposite to that of the jug. The sign of [tex]v(\text{board})[/tex] would be opposite to that of [tex]v(\text{jug})[/tex]. Since [tex]v(\text{jug})\![/tex] is positive, the value of [tex]v(\text{board})\!\![/tex] should be negative.
[tex]\begin{aligned}\Delta p(\text{board}) &= m(\text{board}) \, (v(\text{board}) - u(\text{board})) \\ &= (1.9)\, ((-0.65)- 0)\; {\rm kg\cdot m\cdot s^{-1}} \\ &= (-1.235)\; {\rm kg\cdot m\cdot s^{-1}}\end{aligned}[/tex].
Let [tex]m(\text{boy})[/tex] denote the mass of the boy. The velocity of the boy was initially [tex]u(\text{boy}) = 0\; {\rm m\cdot s^{-1}}[/tex] and would become [tex]v(\text{boy}) =(-0.65)\; {\rm m\cdot s^{-1}}[/tex] after the toss. The change in the velocity of the boy would be:
[tex]\Delta p(\text{boy}) = m(\text{boy}) \, (v(\text{boy}) - u(\text{boy}))[/tex].
Under the assumptions, the total changes in the momentum of this system (the boy, the skateboard, and the jug) should be [tex]0[/tex]. Thus:
[tex]\Delta p(\text{boy}) + \Delta p(\text{boy}) + \Delta p(\text{jug}) = 0[/tex].
Rearrange and solve for the mass of the boy:
[tex]\Delta p(\text{boy}) = -\Delta p(\text{jug}) - \Delta p(\text{board})[/tex].
[tex]\begin{aligned} m(\text{boy}) &= \frac{-\Delta p(\text{jug}) - \Delta p(\text{board})}{v(\text{boy}) - u(\text{boy})} \\ &= \frac{-(21.6) - (-1.235)}{(-0.65) - 0}\; {\rm kg} \\ &\approx 31.3\; {\rm kg}\end{aligned}[/tex].
suppose one speaker is driven at 569 hz and the other at 559 hz. what is the beat frequency in hz? the average frequency in hz? please write your answers with integers.
When one speaker is driven at 569 Hz and the other at 559 Hz, the beat frequency is 10 Hz and the average beat frequency is 564 Hz.
The beat frequency is equal to the difference between the two frequencies.
Beat frequency = [tex]569 Hz - 559 Hz = 10 Hz[/tex]
So the beat frequency is 10 Hz.
The average frequency is equal to the sum of the two frequencies divided by two.
The average frequency is calculated as follows
Average frequency = [tex](569 Hz + 559 Hz) / 2 = 564 Hz[/tex]
So the average frequency is 564 Hz.
Therefore, the beat frequency is 10 Hz while the average frequency is 564 Hz when one speaker is driven at 569 Hz and the other at 559 Hz.
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