Download Energy Name: Date: 1. A 100-kilogram person acquires a velocity of

Energy
Name:
1.
2.
Date:
A 100-kilogram person acquires a velocity of
15 meters per second down a ski slope. What is
the skier's kinetic energy?
A.
22,500 joules
B.
C.
1,500 joules
D. 115 joules
5.
11,250 joules
4.
A.
1 joule
B.
50 joules
C.
100 joules
D. 0 joules
A pendulum swings as shown in the diagram.
At which position is the kinetic energy of the
pendulum bob least?
A.
A
B.
C.
C
D. D
B
6.
3.
A cart weighing 10 newtons is pushed 10 meters
on a level surface by a force of 5 newtons. What
is the increase in its potential energy?
The diagram shows a cart at four positions as it
moves along its track. At which positions is the
sum of the potential energy and kinetic energy of
the cart the same?
A 75-kilogram boy initially at rest skis down the
slope as shown. Assuming no frictional loss, what
will be his kinetic energy at the bottom of the
slope?
A.
1,500 joules
B.
7,500 joules
C.
15,000 joules
D. 75,000 joules
decreases
C.
remains the same
B.
A and B, only
B.
B and C, only
C.
C and D, only
D. all positions, A through D
As a falling apple approaches the ground, its
potential energy
A.
A.
increases
page 1
7.
The diagram here shows a 1-kilogram stone being
dropped from a bridge 100 meters above a gorge.
10.
As the stone falls, the gravitational potential
energy of the stone
8.
A.
decreases
B.
C.
remains the same
increases
As a pendulum moves from the bottom of its
swing to the top of its swing, the
A.
kinetic energy of the pendulum increases
B.
kinetic energy of the pendulum remains the
same
C.
potential energy of the pendulum decreases
11.
A 0.10-meter spring is stretched from equilibrium
to position A and then to position B as shown in
the diagram. Compared to the spring's potential
energy at A, what is its potential energy at B ?
A.
the same
B.
twice as great
C.
half as great
D. four times as great
The diagram represents a satellite in an elliptical
orbit about the Earth. The highest point A, is four
Earth radii (4R) from the center of the Earth. The
lowest point, B, is two Earth radii (2R) from the
center of the Earth. The mass of the satellite is
3:0 106 kilograms.
D. potential energy of the pendulum increases
9.
The diagram shown here represents a block
suspended from a spring. The spring is stretched
0.200 meter. If the spring constant is 200 newtons
per meter, what is the weight of the block?
A.
40.0 N
B.
C.
8.00 N
D. 4.00 N
Neglecting atmospheric friction, as the satellite
moves from A to B, its total mechanical energy
20.0 N
page 2
A.
decreases
C.
remains the same
B.
increases
Energy
12.
Which graph best represents the relationship
between the kinetic energy (KE) of a moving
object as a function of its velocity (v)?
A.
16.
B.
C.
A basketball player who weighs 600 newtons
jumps 0.5 meter vertically o the oor. What is
her kinetic energy just before hitting the oor?
A.
30 J
B.
60 J
C.
300 J
If the speed of an object is doubled, its kinetic
energy will be
A.
halved
B.
C.
remains the same
B.
increases
A machine is able to do 30 joules of work in
6.0 seconds. The power developed by the machine
is
A.
0.20 watt
B.
0.50 watt
C.
5.0 watts
D. 180 watts
C.
quartered
D. quadrupled
How long would it take a machine to do 5,000
joules of work if the power rating of the machine
is 100 watts?
A.
5,000 sec
B.
50 sec
C.
10 sec
D. 0.2 sec
doubled
19.
15.
decreases
D. 600 J
18.
14.
A.
D.
17.
13.
As the length of time it takes a student to swim
100 meters decreases, the power developed by the
student
How much work is required to lift a 2-kilogram
mass to a height of 10 meters?
Car A and car B of equal mass travel up a hill.
Car A moves up the hill at a constant speed that
is twice the constant speed of car B. Compared
to the power developed by car B, the power
developed by car A is
A.
5 joules
B.
A.
the same
B.
C.
100 joules
D. 200 joules
C.
half as much
D. four times as much
20 joules
page 3
twice as much
Energy
20.
Work is being done when a force
24.
A.
acts vertically on a cart that can only move
horizontally
B.
is exerted by one team in a tug of war when
there is no movement
C.
is exerted while pulling a wagon up a hill
A student pulls a box accross a horizontal oor
at a constant speed of 4.0 meters per second by
exerting a constant horizontal force of 45 newtons.
Approximately how much work does the student
do against friction in moving the box 5.5 meters
across the oor?
A.
45 J
B.
180 J
C.
250 J
D. 740 J
D. of gravitational attraction acts on a person
standing on the surface of the Earth
25.
21.
A constant force of 2.0 newtons is used to push
a 3.0-kilogram mass 4.0 meters across the oor.
How much work is done on the mass?
A.
22.
6.0 J
B.
8.0 J
C.
12 J
The accompanying graph represents the elongation
of a spring as a function of the applied force.
D. 24 J
A 10-newton force is required to move a
3.0-kilogram box at constant speed. How much
power is required to move the box 8.0 meters in
2.0 seconds?
A.
40 W
B.
20 W
C.
15 W
D. 12 W
How much work must be done to stretch the
spring 0.40 meter?
A.
23.
4.8 J
B.
6.0 J
C.
9.8 J
D. 24 J
J s
D. J=s
If the speed of a moving object is doubled, which
quantity associated with the object must also
double?
A.
its momentum
B.
its kinetic energy
C.
its acceleration
26.
One watt is equivalent to one
A.
D. its gravitational potential energy
page 4
N m
B.
N=m
C.
Energy
27.
A 3.0-kilogram block is initially at rest on a
frictionless, horizontal surface. The block is
moved 8.0 meters in 2.0 seconds by the application
of a 12-newton horizontal force, as shown in the
accompanying diagram.
30.
The diagram below shows a toy cart possessing
16 joules of kinetic energy traveling on a
frictionless, horizontal surface toward a horizontal
spring.
What is the average power developed while moving
the block?
A.
28.
24 W
B.
32 W
C.
48 W
If the cart comes to rest after compressing the
spring a distance of 1.0 meter, what is the spring
constant of the spring?
D. 96 W
As shown in the diagram below, a child applies
a constant 20.-newton force along the handle
of a wagon which makes a 25 angle with the
horizontal.
A.
32 N/m
B.
16 N/m
C.
8.0 N/m
D. 4.0 N/m
How much work does the child do in moving the
wagon a horizontal distance of 4.0 meters?
A.
29.
5.0 J
B.
34 J
C.
73 J
D. 80. J
The accompanying diagram shows block A, having
mass 2m and speed v, and block B having mass
m and speed 2v.
Compared to the kinetic energy of block A, the
kinetic energy of block B is
A.
the same
B.
twice as great
C.
one-half as great
D. four times as great
page 5
Energy
31.
A wooden crate is pushed at constant speed across
a level wooden oor. Which graph best represents
the relationship between the total mechanical
energy of the crate and the duration of time the
crate is pushed?
33.
The diagram below represents a 155-newton box
on a ramp. Applied force F causes the box to
slide from point A to point B.
A.
What is the total amount of gravitational potential
energy gained by the box?
A.
B.
34.
28.4 J
B.
279 J
C.
868 J
D. 2740 J
Base your answer(s) to the following question(s)
on the information and diagram below.
A 250.-kilogram car is initially at rest at
point A on a roller coaster track. The car
carries a 75-kilogram passenger and is
20. meters above the ground at point A.
[Neglect friction.]
C.
D.
Compare the total mechanical energy of the car
and passenger at points A, B, and C.
35.
32.
As a ball falls freely toward the ground, its total
mechanical energy
A.
decreases
C.
remains the same
B.
increases
Two students of equal weight go from the rst
oor to the second oor. The rst student uses an
elevator and the second student walks up a ight
of stairs. Compared to the gravitational potential
energy gained by the rst student, the gravitational
potential energy gained by the second student is
A.
page 6
less
B.
greater
C.
the same
Energy
36.
37.
The work done in accelerating an object along
a frictionless horizontal surface is equal to the
change in the object's
A.
momentum
B.
C.
potential energy
D. kinetic energy
40.
velocity
If the two spheres are allowed to fall freely to the
ground, they will experience the same
A 5-newton force causes a spring to stretch
0.2 meter. What is the potential energy stored in
the stretched spring?
A.
1J
B.
0.5 J
C.
The diagram here shows a 1-kilogram aluminum
sphere and a 3-kilogram copper sphere of equal
radius located 20 meters above the ground.
0.2 J
D. 0.1 J
A.
acceleration
B.
decrease in potential energy
C.
increase in kinetic energy
D. speci c gravity
38.
When a 1.53-kilogram mass is placed on a spring
with a spring constant of 30.0 newtons per meter,
the spring is compressed 0.500 meter. How much
energy is stored in the spring?
A.
39.
3.75 J
B.
7.50 J
C.
15.0 J
D. 30.0 J
A ball is thrown at an angle of 38 to the
horizontal. What happens to the magnitude of the
ball's vertical acceleration during the total time
interval that the ball is in the air?
A.
It decreases, then increases.
B.
It decreases, then remains the same.
C.
It increases, then decreases.
D. It remains the same.
page 7
Energy
Problem-Attic format version 4.4.210
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Energy
04/29/2014
1.
Answer:
B
21.
Answer:
B
2.
Answer:
D
22.
Answer:
A
3.
Answer:
C
23.
Answer:
A
4.
Answer:
A
24.
Answer:
C
5.
Answer:
D
25.
Answer:
A
6.
Answer:
D
26.
Answer:
D
7.
Answer:
A
27.
Answer:
C
8.
Answer:
D
28.
Answer:
C
9.
Answer:
A
29.
Answer:
B
10.
Answer:
D
30.
Answer:
A
11.
Answer:
C
31.
Answer:
A
12.
Answer:
C
32.
Answer:
C
13.
Answer:
C
33.
Answer:
B
14.
Answer:
D
15.
Answer:
D
16.
Answer:
35.
Answer:
C
B
17.
Answer:
36.
Answer:
D
C
18.
Answer:
37.
Answer:
B
B
19.
Answer:
38.
Answer:
A
B
39.
Answer:
D
20.
Answer:
C
40.
Answer:
A
34.
Answer:
Total mechanical energy is the same at all
three points.