Which one of the following bodies has only potential energy?
a. a cat sitting on the fence
b. a stone falling from a cliff
c. a ball rolling downhill
d. a dog running after a car

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

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)