What is the energy transformation of a burning candle?
Chemical->Thermal
A 10-N force is exerted on a box, moving it 20 m in the same direction. What is the magnitude of work done on the box?
200 J
What is the difference between potential and kinetic?
Potential energy is energy waiting to go into motion. Kinetic energy is energy in motion.
What is the energy transformation in a flashlight?
Chemical->Electrical->Heat and Light
How much work is done when a person picks up for 4.7 m a 7.7 N back pack from the floor?
Calculate the potential energy of 8 kg ball suspended 5 m above ground.
392 J
What two things affect kinetic energy?
Mass how heavy an object is. Velocity how fast an object moves.
What is the energy transformation in a windmill?
Kinetic->Electrical and Mechanical
If a powerlifter raises a 1,000 N weight a distance of 2.0 meters in 0.5 seconds, what is his power output?
4,000 W
What is the potential energy of 47 kg boy that is standing on the top of the diving board that is 7.5 m high.
3,454.5 J
How much kinetic energy does a 200 kg cart have when going 40 m/s?
160,000 J
Which of the following is the best example of kinetic energy being transformed into potential energy?
A. A ball rolling up a hill
B. Bending a paper clip
C. Coasting down a hill on a bicycle
A. A ball rolling up a hill
Conveyor belts are often used to move packages around warehouses. The conveyor shown below moves packages at a steady 4.0 m/s. A 500 N employee decides to catch a ride by sitting on a 1,000 N box for a 50 m trip as shown below.
What is the work done?
0 J
Which of the following does not contribute to the potential energy of an object?
A. Mass of the object
B. Height of the object above the Earth's surface
C. Velocity of the object
C. Velocity of the object
A 100 kg gymnast comes to a stop after tumbling. Her feet do 5,000 J of work to stop her.
Which of the following was the girl's velocity when she began to stop?
10 m/s