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WorksheetsUnit 3 T4: Work, Energy, and Power
Total questions: 24
Worksheet time: 2hrs 53mins
Name
Class
Date
1.
In which of the following situations do your arms do work on books?
a)
holding a heavy stack of books while standing
b)
carrying a heavy stack of books
c)
dropping a stack of books onto a table
d)
picking up a pile of books from the floor
2.
Ms. McDonald holds a desk perfectly still above her head. If she holds the desk at a height of 0.5 meters above her head, and applis 68 Newtons of force to do so, how much work has she done?
a)
34 Joules
b)
0 Joules
3.
I do 132 Joules of work on a bookcase. If I apply a force of 6 Newtons, how far have I moved the bookcase?
a)
22 meters
b)
792 meters
c)
17 meters
d)
320 meters
4.
Elastic potential energy is energy stored in object that are compressed or __________.
a)
movement
b)
stored
c)
harnessed
d)
pulled
5.
One of the tallest radio towers is in Fargo, North Dakota. The tower is 639m tall, or about 44 percent taller than the Sears Tower in Chicago. If a bird lands on top of the radio tower, so that the gravitational potential energy associated with the bird is 2033J, what is its mass?
a)
3.08 kg
b)
31.17 kg
c)
0.32 kg
d)
13.13 kg
6.
In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump. The gravitational potential energy associated with Sotomayor’s jump was 1970J. Sotomayor’s mass was 82kg. How high did he jump?
a)
237.3 m
b)
15.83 km
c)
24 m
d)
2.45 m
7.
With an elevation of 5334m above sea level, the village of Aucanquilca, Chile is the highest inhabited town in the world. What would be the gravitational potential energy associated with a 64kg person in Aucanquilca?
a)
3345484 J
b)
5407.8 J
c)
816.76 J
d)
72.31 J
8.
The kinetic energy of a golf ball is measured to be 143.3J. If the golf ball has a mass of about 47g, what is its speed?
a)
2.46 m/s
b)
3367.55 m/s
c)
1.52 m/s
d)
6.09 m/s
9.
When a 65 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances the force due to free fall. How fast is the skydiver falling if her kinetic energy at the moment is 704000J?
a)
21661.53 m/s
b)
147.17 m/s
c)
22880.0 km/s
d)
10830.76 m/s
10.
A table tennis ball has a mass of 2.45g (convert this to kg). Suppose the ball is hit across the table with a speed of 4.0m/s. What is its kinetic energy?
a)
0.049 J
b)
4.9 J
c)
0.0196 J
d)
19
19.6 J
19.6 J
11.
e largest land predator is the male polar bear, which typically has a mass of around 500kg. If the maximum kinetic energy for a polar bear with this mass is 60500J, what is its top speed?
a)
15.5 m/s
b)
242 m/s
c)
121 m/s
d)
1.55 m/s
12.
What is the equation for power and energy?
a)
P = E/t
b)
E = P/t
c)
T = P x E
d)
P = W/t
13.
What is being transferred as you do work?
a)
Energy
b)
Heat
c)
Power
d)
Gravitational Potential Energy
14.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
15.
A motor does 6,800 Joules of work raising an injured man off of Camelback Mountain onto a helicopter. The motor airlifting the patient consumed 22,000 Joules of electrical energy. Calculate the mechanical efficiency of the motor.
a)
15.2%
b)
30.9%
c)
75%
d)
100%
16.
Bro A bench presses 145-lbs five times in 20 seconds.
Bro B bench presses 145-lbs five times in 10 seconds.
Bro B bench presses 145-lbs five times in 10 seconds.
a)
Bro A did more work.
b)
Bro B did more work.
c)
Both Bros did the same amount of work.
d)
Bro
17.
Bro A bench presses 145-lbs five times in 20 seconds.
Bro B bench presses 145-lbs five times in 10 seconds.
Bro B bench presses 145-lbs five times in 10 seconds.
a)
Bro A has more power
b)
Bro B has more power
c)
Both Bros have the same power
d)
Bro
18.
A 2kg ball and a 4kg ball are released from rest at the same height at the same time. After falling for 3 seconds, both balls have the same _____.
a)
Position
b)
Velocity
c)
Acceleration
d)
All of the above
19.
A 2kg ball and a 4kg ball are released from rest at the same height at the same time. After falling for 3 seconds, the balls will have different ____.
a)
Velocities
b)
Kinetic Energies
c)
Heights
20.
Two riders of equal mass begin at the top of a hill. If friction is neglected, which rider will have the greatest velocity at the bottom of the hill?
a)
Rider A
b)
Rider B
c)
Both Riders will have the same velocity
21.
Which graph BEST shows the relationship of kinetic energy to potential energy as a book sits on the edge of a desk?
a)
A
b)
B
c)
C
d)
D
22.
Which graph BEST shows the relationship of kinetic energy to potential energy as you lift a box on a shelf.
a)
A
b)
B
c)
C
d)
D
23.
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
24.
45,000 Joules of work done in 90 seconds results in how much power?
a)
50 watts
b)
500 watts
c)
5000 watts
d)
4,050,000 watts
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