A car, a train, a bicycle, and a skateboard are traveling at the same speed. Which object has the greatest kinetic energy?
A) Car
B) Bicycle
C) Train
D) Skateboard
Ans: C) Train
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An object moving in a circle undergoes centripetal acceleration
Indicate whether the statement is true or false
A person applies a constant force on an object of mass 20 kg that causes the object to move horizontally at a constant speed of 0.20 m/s through a distance of 0.80 m. What is the work done on the object?
A) 160 J B) 10 J C) 16 J D) 0 J E) Cannot be determined without knowing the magnitude of the applied force.
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T
A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21 b. 42 c. 58 d. 10 e. 79