The diagram below shows a boulder rolling down a hill into a valley and the back up the opposite side.
A which position does the boulder have the greatest kinetic energy?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)