1Question
A 2.0 kg textbook is lifted from the floor to a shelf 1.5 m high. How much gravitational potential energy does it gain?
2Question
A student pushes a 10 N object across the floor for 4.0 m in the direction of motion. How much work is done by the student?
3Question
A 3.0 kg ball is moving at 6.0 m/s. What is its kinetic energy?
4Question
A 500 W heater runs for 12 s. How much energy does it use?
5Question
A force of 25 N moves a cart 8.0 m at constant speed. What work is done?
6Question
A 4.5 kg backpack is raised 2.2 m. How much gravitational potential energy does it gain?
7Question
A bicycle and rider with a combined mass of 70 kg travel at 4.0 m/s. What is their kinetic energy?
8Question
A machine does 1,800 J of work in 15 s. What is its power output?
9Question
A student lifts a 12 kg crate vertically by 0.80 m. How much work is done against gravity?
10Question
A 60 W light bulb operates for 25 minutes. How much energy does it consume?
11Question
A 0.20 kg soccer ball is kicked so that it reaches a speed of 18 m/s. What is its kinetic energy?
12Question
A 15 N force pulls a sled 12 m, but the force is applied at the same direction as the motion. How much work is done?
13Question
A 5.0 kg object is lifted from ground level to a platform 3.6 m high. What is the increase in gravitational potential energy?
14Question
A motor supplies 3.6 kJ of energy in 30 s. What is the motor’s power?
15Question
A 1.2 kg pendulum bob is raised 0.45 m above its lowest point. How much gravitational potential energy does it gain?
16Question
A car with a mass of 1200 kg is traveling at 20 m/s. What is its kinetic energy?
17Question
A worker applies a 180 N force to move a box 5.0 m across a floor. If the force is in the direction of motion, how much work is done?
18Question
A 75 W speaker runs for 2.5 hours. How much energy does it use in joules?
19Question
A 2.5 kg object falls freely from a height of 8.0 m. Neglecting air resistance, how much kinetic energy does it have just before impact?
20Question
A student does 1.2 kJ of work lifting a box. If the box is lifted 2.5 m, what is the mass of the box?
21Question
A crane lifts a 250 kg steel beam upward at constant speed by 6.0 m in 8.0 s. How much work does the crane do, and what is its power output?
22Question
A 0.50 kg cart speeds up from 2.0 m/s to 8.0 m/s. How much work is done on the cart?
23Question
A 900 kg elevator is raised 18 m in 12 s. How much gravitational potential energy does it gain, and what is the average power required?
24Question
A force of 40 N acts on a sled at an angle of 60° to the direction of motion over a distance of 10 m. How much work is done by the force?
25Question
A 2.0 kW kettle is used to heat water for 3.5 minutes. How much energy does it transfer?
26Question
A 1,500 kg car slows from 24 m/s to 10 m/s. How much kinetic energy does it lose?
27Question
A battery stores 18,000 J of energy and powers a device that uses 30 W. How long can the device run?
28Question
A 6.0 kg object is lifted 4.0 m, then moved horizontally 10 m at the same height. How much work is done on the object by gravity during the entire motion?
29Question
A roller coaster car with mass 450 kg starts from rest at the top of a hill 30 m high. Ignoring friction, what speed will it have at the bottom?
30Question
A hydroelectric turbine receives 4.5 x 10^6 J of water energy in 20 s and converts 38% of it into electrical energy. What is the electrical power output?