WORK
POWER
PE
KE
Elastic Energy
100
The total work done in lifting a 15N high school physics textbook a vertical distance of 0.10 meter is approximately
1.5 JOULES
100
Which term identifies a scalar quantity?
(1) displacement (2) momentum (3) velocity (4) power
4
100
How much potential energy does a 3.0 kg ball have if it is held 25 m above the ground?
736 JOULES
100
A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicyclist?
5,400 JOULES
100
A student produced various elongations of a spring by applying a series of forces to the spring. The graph below represents the relationship between the applied force and the elongation of the spring
Determine the spring constant of the spring
20 N/M
200
How much work is done by the force lifting a 0.1-kilogram hamburger vertically upward at constant velocity 0.3 meter from a table?
0.294 JOULES
200
What is the maximum height to which a motor having a power rating of 20.4 watts can lift a 5.00-kilogram stone vertically in 10.0 seconds?
4.16 m
200
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.
What is the total amount of gravitational potential energy gained by the box?
279 JOULES
200
Calculate the kinetic energy of a particle with a mass of 3.34 × 10–27 kilogram and a speed of 2.89 × 105 meters per second.
1.39 x 10^-16 JOULES
200
A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring?
74.9 N/M
300
Which graph best represents the greatest amount of work?
2
300
If a motor lifts a 400.-kilogram mass a vertical distance of 10. meters in 8.0 seconds, the minimum power generated by the motor is
4,900 W or 4.9 x 10^3 W
300
Determine the total amount of gravitational potential energy, in joules, gained by the box as it is pulled to the top of the incline.
1,000 JOULES
300
A 30.4-newton force is used to slide a 40.0-newton crate a distance of 6.00 meters at constant speed along an incline to a vertical height of 3.00 meters.
State what happens to the kinetic energy of the crate as it slides along the incline.
CONSTANT
300
A vertically hung spring has a spring constant of 150. newtons per meter. A 2.00-kilogram mass is suspended from the spring and allowed to come to rest. Calculate the elongation of the spring produced by the suspended 2.00-kilogram mass
0.13 M
400
If 40.0 J of work is done to move a box 2.0 meters, how much force acted on the box?
20 JOULES
400
How much power is generated by a 3.5 N force moving a block at 2.0 m/s?
7.0 W
400
A 30.4-newton force is used to slide a 40.0-newton crate a distance of 6.00 meters at constant speed along an incline to a vertical height of 3.00 meters.
Determine the total gravitational PE of the box at the top.
120 JOULES
400
A pendulum is made from a 7.50-kilogram mass attached to a rope connected to the ceiling of a gymnasium. The mass is pushed to the side until it is at position A, 1.5 meters higher than its equilibrium position. After it is released from rest at position A, the pendulum moves freely back and forth between positions A and B, as shown in the diagram below.
What is the total amount of kinetic energy that the mass has as it swings freely through its equilibrium position?
110 JOULES
400
A vertical spring has a spring constant of 100. newtons per meter. When an object is attached to the bottom of the spring, the spring changes from its unstretched length of 0.50 meter to a length of 0.65 meter. The magnitude of the weight of the attached object is
15 N
500
Calculate the total work done on the box by the student while pushing the box from the bottom to the top of the incline.
150 JOULES
500
A motor does a total of 480 joules of work in 5.0 seconds to lift a 12-kilogram block to the top of a ramp. The average power developed by the motor is
96 W
500
A 2-kilogram paper cup falls from rest off the edge of a tabletop 0.90 meter above the floor. If the cup has 2.0 joules of kinetic energy when it hits the floor, what is the total amount of energy converted into internal (thermal) energy during the cup’s fall?
15.7 JOULES
500
As a box is pushed 30. meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300. joules. How much total internal energy is produced during this process?
450 JOULES
500
Which graph best represents the relationship between the potential energy stored in a spring and the change in the spring’s length from its equilibrium position?
1