The law of conservation of energy applies:

A. whenever PE = 0.

B. in isolated systems.

C. in all systems

D. only in open mechanical systems.

in a game of hockey the hockey puck took 0.8 seconds to travel 89 feet to the goal line. determine the average speed of the puck per second

The energy provided each hour by heat to the turbine in an electric power plant is 9.0*10^12 J. If 5.4 * 10^12 J of energy is exhausted each hour from the engine as heat, what is the efficiency of this heat engine?

Assume you are a perfect blackbody at a temperature of T = 310 K. What is the rate, in watts, at which you radiate energy? (For the purposes of this problem, you may assume you are spherical with a mass of 70 kg and density equal to that of water)

If equal force were applied to a basketball and a baseball, which would travel further, according to Newton's 2nd law of motion?

A 535 kg roller coaster car began at rest at the top of a 93.0 m hill. Now it is at the top of the first loop-de-loop. This roller coaster's track is nearly frictionless, so resistance can be ignored. Using g = 9.

A large metallic sphere insulated from ground is charged with an electrostatic generator while a person standing on an insulating stool holds the sphere. why is it safe to do this?

What is the tense In sailed

Acceleration is a vector quantity. O O A. True B. False

What will happen to the brightness of a string of bulbs hooked up in series when you increase the number of bulbs in the string? A. Each light in the string will get brighter. B. Each light in the string will get dimmer. C.

What are the two factors that influence the composition of beach material