Answer:
Work = Force * Distance definition of work
W = F * d
If one uses 1/2 the force to move an object, then he must move the force thru twice the distance to get the same work output.
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Question 5 (8 points)
Which is an example of kinetic friction?
friction between a car's wheels and the road as the car moves
friction between your shoes and the ground when you stand still
friction between a sticky note and the page of a book as it marks your pla
O friction between your skin and a pencil as it rests in your palm
0 0
UD
Answer:
The car and the road have kinetic friction.
Explanation:
Because the car is getting a force of friction because of the kinetic energy caused by the engine.
Two masses m1 500 g and m2 1.5 kg on a frictionless, horizontal surface are connected by a light string. A force Fì with magnitude 5 N is exerted on m2 to the right. Assume the tension has
the same magnitude at every point in the string, and neglect air resistance.
(a) Since the masses are connected by a string, they are constrained to move together. Express this constraint as an equation relating the accelerations of the two masses.
(b) Draw free-body diagrams for the two masses and write down the horizontal component of the net force on each mass.
(c) Use Newton’s 2nd law and the constraint from part (a) to find the acceleration of both masses and the magnitude T of the tension in the string.
(a) The equation relating to the acceleration of the two masses is a = F/(m₁ + m₂).
(b) The acceleration of both masses is 2.5 m/s².
(c) The magnitude of the tension in the string is 1.25 N.
Equation relating the accelerations of the two massesThe equation relating to the acceleration of the two masses is given as;
F - T = m₂a ---- (1)
T = m₁a ---- (2)
F - m₁a = m₂a
F = m₁a + m₂a
F = a(m₁ + m₂)
a = F/(m₁ + m₂)
Free body diagram (FBD)→ ← →
T T F
Acceleration of both massesThe acceleration is calcuated as follows;
a = F/(m₁ + m₂)
a = 5/(0.5 + 1.5)
a = 5/(2)
a = 2.5 m/s²
Tension in the stringT = m₁a
T = 0.5 x 2.5
T = 1.25 N
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The following graph shows the force exerted on and the displacement of object being pulled
Find the work done to pull the object 7.0 m
The work done to pull the object 7.0 m is the total area under the graph from 0.0 m to 7.0 m, determined as 245 J.
Work done by the applied forceThe area under force versus displacement graph is work done.
The total work done by pulling the object 7 m, can be grouped into two areas;
First area, A1 = area of triangle from 0 m to 2.0 mSecond area, A2 = area of trapezium, from 2.0 m to 7.0 mA1 = ¹/₂ bh
A1 = ¹/₂ x (2) x (20)
A1 = 20 J
A2 = ¹/₂(large base + small base) x height
A2 = ¹/₂[(7 - 2) + (7-3)] x 50
A2 = ¹/₂(5 + 4) x 50
A2 = 225 J
Total work doneW = A1 + A2
W = 20 J + 225 J
W = 245 J
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Estimate humanity’s current consumption of energy in one day (in Joule).
Based on data from world energy consumption, the estimated humanity’s current consumption of energy in one day is above 208 million joules per day.
What is energy consumption?Energy is the ability to do work. Therefore, energy consumption refers to the amount of energy used to do work.
Humans need energy for various purposes such as;
lightingheating operation of machinesfeeding, etc.Due to rapid growth on population as well as technology, the human energy consumption is on the increase.
In 2020, the world primary energy consumption was 71,4 GJ per person for a world population of about 7.7 billion people.
Therefore, the estimated humanity’s current consumption of energy in one day is above 208 million joules per day.
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Seawater is full of moving molecules that possess kinetic energy. Could we extract some of this energy
water falls off a cliff of height 20m at a rate of 50kg per second
calculate the mass of water that falls in 1 minute
calculate the gravitational potential energy lost by the water in 1 minute
Answer:
M = 50 kg / sec * 60 sec = 3000 kg water that falls
PE = M g h initial potential energy of water
PE = 3000 kg * 9.8 m/s^2 * 20 m = 588,000 joules of energy lost
How many electrons are in -2.8µC of excess electric charge?
The number of electrons present in -2.8µC of excess electric charge is 1.75 × 10¹³ electrons
Calculating the number of electronsFrom the question, we are to determine the number of electrons present in the given charge
The number of electrons can be determined by using the formula,
[tex]n = \frac{q}{e}[/tex]
Where n is the number of electrons
q is the magnitude of charge
and e is the charge of an electron (e = 1.6 × 10⁻¹⁹ C)
From the given information,
q = 2.8 μC = 2.8 × 10⁻⁶ C
Putting the parameters into the equation, we get
[tex]n = \frac{2.8 \times 10^{-6} }{1.6 \times 10^{-19} }[/tex]
n = 1.75 × 10¹³ electrons
Hence, the number of electrons present in -2.8µC of excess electric charge is 1.75 × 10¹³ electrons
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Choose all the answers that apply.
Erosion can be reduced by:
1. contour plowing
2. putting up fences
3. planting trees
4. removing topsoil
Answer:
The answer will be #3 and #4
Explanation:
Because the more the organisms live in the topsoil the weaker the soil would get and most likely that would happen and planting trees stop soil erosion because when the trees absorb water underground it makes the soil firm and tight just like the (abnormal) soil you would see near few feet near most trees.
Physics help pleaseeeee
Answer:
-11459.478 N
Explanation:
mass of the ball = 152 g = 152 / 1000 = 0.152 kg
initial speed of the ball = 40.6 m/s
final speed of the ball = - 46.1 m/s
time of impact = 1.15 ms = 1.15 / 1000 = 0.00115 s
impulse, Ft = change in momentum = mv - mu = m (v-u)
F = m (v - u) / t = 0.152 kg ( -46.1 -40.6) / 0.00115 s = -11459.478 N
A coil of wire with 226 circular turns of radius 3.20 cm is in a uniform magnetic field along the axis of the coil. The coil has R = 42.4 Ω
At what rate, in teslas per second, must the magnetic field be changing to induce a current of 0.155 A in the coil?
Answer:
R 44.4
Explanation:
One point charge +Q is placed at the center of a square, and a second point charge -Q is placed at the upper-left corner of the square. It is observed that an electrostatic force of magnitude 2.0 N acts on the positive charge at the center. Now a third charge -Q is placed at the lower-left corner of the square, as shown in the figure. What is the magnitude of the net force that acts on the center charge now? The figure shows one positive charge labeled + Q placed at the center of a square and two negative charges labeled -Q placed at the upper left and the bottom left corners of the square.
a) 0.0 N
b) 2.8 N
c) 5.3 N
d) 4.0 N
Answer:
One should draw a diagram showing the placement of the charges.
When both charges of -Q are placed there will be no force in the vertical direction because of cancellation of forces.
A line from one corner of the square to the other makes an angle of 45 degrees,
2 cos 45 deg will be the force due to one charge.
2 * .707 = 1.41 N
So for both charges the force is (horizontal, vertical is zero)
2 * 1.41 = 2.82 N
b) is correct
The magnitude of the net force that acts on the center charge will be 2.82 N.Option B is correct.
what is the charge?
When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.
Case 1 ;
One point charge +Q is placed at the center of a square, and a second point charge -Q is placed at the upper-left corner of the square.
When both charges of -Q are placed there will be no force in the vertical direction because of the cancellation of forces.
A line from one corner of the square to the other makes an angle of 45 degrees,
The force due to the one charge at the angle of the 45° will be;
[tex]\rm F_1 = 2 \times cos 45^0 \\\\ \rm F_1 =1.41 \ N[/tex]
For both the charge the net force is the double the force due to the one charge;
[tex]\rm F = 2 \times F_1 \\\\ \rm F = 2 \times 1.41 \\\\ F=2.82 \ N[/tex]
The magnitude of the net force that acts on the center charge will be 2.82 N.
Hence option B is correct.
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The system is released from rest at θ = 0° when a constant couple moment M = 100 N.m is applied. If the mass of the cable and links AB and BC can be neglected, and each pulley can be treated as a disk having a mass of 6 kg, determine the speed of the 10-kg block at the instant link AB has rotated θ = 90°. Note that point C moves along the vertical guide. Also, the cable does not slip on the pulleys.
For a system released from rest at θ = 0° when a constant couple moment M = 100 N.m is applied, the speed of the 10-kg block is mathematically given as
V=4.33m/s
What is the speed of the 10-kg block?Generally, the equation for the workdone is mathematically given as
W=T tehta<dtheta
W=100(90*\pi/180)
W=1.5707*100
W=1.57Nm
The change in potential energy across the pulley
dP=mgh
dp=10*9.81*111.8
dp=10.97J
For the thrid position, potential energy is
dP=mg(0.3)
dP=17.658J
dP'=17.658J-13.125
dP'=-4.532J
For 2nd position dP=0
The change in Kinectic energy across the pulley\
dK.E=0.5mv^2
For 1st
dk.E=0.5m(10)^2
2nd
dK.E=0.5Iw^2
dK.E=0.5(7.5*10^-3)(v^2/0.05)^2
3rd
2nd=3rd
In conclusion,
157.07=dKE+dP.E
157.07=5v^2+ (7.5*10^-3)(v^2/0.05)^2+10.97-4.53
V=4.33m/s
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Black holes:
A are the brightest objects in space.
B are the most well understood objects in space.
C pulse in a regular pattern.
D None of the choices are correct.
Answer:
Black holes:
A are the brightest objects in space.
B are the most well understood objects in space.
C pulse in a regular pattern.
D None of the choices are correct.
Explanation:
A black hole is a region of space where the pull of gravity is so strong that nothing can escape. It's a "hole" in the sense that things can fall in, but not out of it. It is "black" in the sense that not even light can escape.
I hope I helped you! :)
The magnetic flux through a coil of wire containing two loops changes from -65 Wb to +47 Wb in 0.38 s What is the emf induced in the coil? Express your answer using two significant figures
Hi there!
Recall Faraday's Law:
[tex]\epsilon = N\frac{d\Phi_B}{dt}[/tex]
ε = Induced emf (V)
N = Number of Loops
φ = Magnetic Flux (Wb)
t = time (s)
Thus, the induced emf is equivalent to the number of loops of the coil times the rate of change of the magnetic flux bounded by the area of the coil, so:
[tex]\epsilon = 2 \cdot \frac{47 - (-65)}{0.38} = 2 \cdot \frac{112}{0.38} = 589.47V =\boxed{ 5.9 \times 10^2 V}}[/tex]
**This is the magnitude of the induced emf. With Lenz's Law, however, the answer would be negative, which just indicates it is a resistive emf.
Questions:
What are Newton’s Three Laws of Motion?
Explain what you learned about how the planets orbit around the Sun (Kepler’s Laws).
What are the Fundamental Forces?
Give some examples of the force vectors shown in force diagrams.
What is the normal force and what direction does the force arrow point on the force diagram?
What is the name of the force that is a combination of all forces that act on an object?
If you go to the Moon, explain what happens to your mass and weight.
Define mass and weight.
Does an object at rest have forces acting on it?
What is Inertia? What does it apply to?
You are pushing a book across a desk with a constant velocity. What are the forces acting on the book and in what direction? Are the y-forces equal in magnitude, why or why not? Are the x-forces equal in magnitude, why or why not? Explain using Newton’s Second Law. If you push on the book, according to Newton’s Third Law of Motion, what is the equal and reactive force?
The planets orbit the sun due to gravitational force of the sun on them which keep it in their orbits.
The Newton's three laws of motion are the following:The first law of motion is also called Law of Inertia, the second law of motion is the Law of Mass and Acceleration, and the Third Law of Motion that have action and reaction forces.
How the planets orbit around the Sun?The gravity of the Sun keeps the planets in their orbits. They stay and revolve in their orbits because there is no other force in the Solar System which can put pressure on them.
So we can conclude that planets orbit the sun due to gravitational force of the sun on them which keep it in their orbits.
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5
What is the electric force between two particles that are 5m apart. One of the
particles has a charge of 100C while the other has a charge of 20C. (k=9x109)
k=
9=
92=
r=
Answer:
[tex]7.2 \times 10 {}^{11} newton[/tex]
Explanation:
[tex]the \: magnitude \: of \: the \: forc \: e \: can \: be \: calculated \: using \: coulombs \: formular \\ f = \frac{k \times q1 \times q2}{d {}^{2} } \\ f = \frac{9 \times 10 {}^{9} \times 100 \times 20 }{5 {}^{2} } \\ f = \frac{18000 \times 10 {}^{9} }{25 } \\ f = \frac{18000000000000}{25} \\ f = 7.2 \times 10 {}^{11} newton[/tex]
Consider the collision between the moving cue ball and the red 15 ball
that is at rest on the table pool. All BUT ONE statement describes what
occurs when the cue ball collides with the 15 ball,
A)
Each ball experiences an equal force directed in
opposite directions,
B)
The 15 ball experiences a rightward force that causes
it to speed up.
The acceleration of the 15 ball is greater than that of
the cue ball.
The moving cue ball experiences a leftward force
that causes it to slow down.
9
D)
From the laws of Newton, the balls experiences an equal force directed in opposite directions.
What is collision?Collision is said to occur when on object bumps into another. Collisions are described by the law of conservation of linear mometum which ststes that momentum is neither created nor destroyed.
The question is incomplete hence we can not fully answer the question. However, from the laws of Newton, the balls experiences an equal force directed in opposite directions.
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MARKING BRAINLIEST
Who discovered the four laws of black hole mechanics?
Explanation:
Jacob Bekenstein, Brandon Carter, and James Bardeen(few new stuff were done by Stephen hawking)
Which equation can be used to find the measurement of angle C to the nearest degree what is the measurement of angle A
Answer:
12
Explanation:
the numbers are swapped so by conclusionn it is 12
ASAP HELPPPPPP POP PLEASE
Answer:
The answer is in the attachment
Explanation:
!!PLEASE PLEASE PLEASE PLEASE PLEASE MARK ME THE BRAINLIEST!!
A A body of mass 2.5kg and density 5oo0kgm^_3 fully Immersed in water the body w 3 The uptrust experienced by
Answer:
500 gm
Explanation:
There may be some typos in your question post, here is my best guess of what you posted:
2.5 kg / 5000 kg /m^3 = .0005 m^3 water displacement
.0005 m^3 = 500 cm^3 for water this equals 500 gm
A wire is joined to points X and Y in the circuit diagram shown. A diagram of a circuit with a power source on the left. Directly above the power source is a dot labeled X and then a circle with an X in it. The circuit then splits with one path straight back to the power source and the other path has 3 circles with X in them labeled 2, 3, and 4 respectively. There is a point labeled Y between circles 2 and 3.A diagram of a circuit with a power source on the left. Directly above the power source is a dot labeled X and then a circle with an X in it. After the x are 4 different circles on the circuit with Xs in them labeled 1, 2, 3, and 4 respectively. There is a point labeled Y in between circles 2 and 3. There is a branch of the circuit from X to Y. How does the circuit change when the wire is added? A closed circuit occurs and makes all bulbs turn off. An open circuit occurs and makes all bulbs turn off. A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit. A short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
Answer:
c thats the answer yep
Answer:
D.
Explanation:
The wire allows the current to follow the quickest path & will therefore follow the XY wire, restricting the energy source from reaching bulbs 1 and 2 which are beyond that wire.
A 43 kg rock is dropped from a 36 tower. How long does it take the rock to fall to the ground?
A 43-kg rock is dropped from a 36 m, experiencing a Uniformly Accelerated Motion and falling to the ground 2.7 s later.
What is a Uniformly Accelerated Motion?A Uniformly Accelerated Motion is a motion in which the acceleration of the object is constant.
A 43 kg rock is dropped from a 36 m tower. Given the only acceleration is that of gravity, we can calculate the time required to hit the ground using the following kinematic equation.
s = 1/2 × a × t²
t = √(2s / a)
t = √[2 × 36 m / (9.8 m/s²)] = 2.7 s
where,
s is the displacement.a is the acceleration.t is the time.A 43-kg rock is dropped from a 36 m, experiencing a Uniformly Accelerated Motion and falling to the ground 2.7 s later.
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4. What is the coefficient of x in the expression x + 3y + 2?
A. 0
B. 1
C. 2
D. 3
Answer:
B) 1
Explanation:
There is not a coefficient before x, so automatically the answer is 1
Answer :-
Hi there!
[tex]\:\mathsf\red{Your\:answer\:is\:B.\:(1)}[/tex]
Explantion :-We know
Coefficient is the number or value which should be putten in front of the variable given.
Here,
'x' is the variable. Before x, there is no number mentioned. So the number would be 1.
[tex]\:\sf\purple{Hope\:this\:helps\:you!\::)}[/tex]
Which of the following statements is not true with regards to the first law
of thermodynamics?
A
The first law of thermodynamics states that within an open
system, the total energy of that system will remain constant.
B
A change in internal energy E) can be calculated if you know
how much energy was transferred in the form of heat, and how
much energy was used or created in the form of mechanical
work (w).
•
With regards to heat flow (q), if a system is heated, the energy
will move from the surroundings to the system.
D
You can calculate the change of enthalpy (AH) of a system (the
change in the heat content of the system) by calculating the heat
flow of the system. The heat flow is represented by the letter (q).
Statement A is not true in regard to the first law of thermodynamics. The first law of thermodynamics states that within an open system, the total energy of that system will remain constant. Is incorrect statement.
What is the law of conservation of energy?According to the Law of conservation of energy. Energy can not be created nor be destroyed, it can transfer from one to another form.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
The wrong statement is the first law of thermodynamics states that within an open system, the total energy of that system will remain constant.
The first law of the thermodynamics is valid only for the closed system.
The first law of thermodynamics states that within a closed system, the total energy of that system will remain constant.
Hence, statement A is not true in regard to the first law of thermodynamics
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Please answer by tonight!
Match the term to the definition.
Question 1 options:
As the amount of salt in water increases, the density of the water _________.
This is what moves forward and through a wave.
The distance from the crest of one wave to the crest of another.
The amount of dissolved salt in a liquid.
Water circulation created by prevailing wind systems. The Gulf Stream is an example.
The rising of ocean water bringing nutrients up from the deep.
Water circulation created by differences in density.
The cyclical process of the changing state and movement of water around the Earth through evaporation, condensation, and precipitation.
The length of open sea over which wind can blow steadily to create waves.
The type of energy possessed by moving water.
1.
The water cycle
2.
vapor transport
3.
salinity
4.
increases
5.
decreases
6.
surface currents
7.
Coriolis Effect
8.
deepwater currents
9.
trough
10.
wave period
11.
wavelength
12.
water molecules
13.
energy
14.
crest
15.
fetch
16.
electrical
17.
kinetic
18.
downwelling
19.
upwelling
Answer:
correct
Explanation:
all the answer are good cuc
I just need the answer and EXPLANATION for (b)
torque divided by moment of inertia = angular acceleration inertia = radius squared times mass = 7.533
16.2 ÷ 7.533 = 2.15
give name of any two devices used to measure the amount of matter contained in a container
Answer:
Measuring cup and graduated cylinder
Explanation:
These tools measure the volume of liquid matter. Measuring cups are used frequently in cooking and provide measurements generally in ounces and grams. A graduated cylinder is used in laboratories and in research and allows for a greater degree of precision in measuring the volume.
Which term is defined as the change in the direction of light when it goes from one medium into a different medium?
Question 7 options:
Reflection
Refraction
Transmission
Absorption
Answer:
refraction
Explanation:
16) A car's position in relation to time is plotted on the graph. What can be said about the car during segment B?
A) The car travels for 80 seconds during segment B.
B) The car has come to a stop
and has zero velocity.
C) The car is traveling faster during segment B than in segment C.
D) The car is traveling with a constant
velocity due to the flat line
of the graph.
0)
Answer:
B The car has come to a stop and has zero velocity
Explanation:
I just did the Question