A car has a kinetic energy of 4. 32 x 10^5 j when traveling at a speed of 23 m/s. What is its mass?.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Oxygen and hydrogen gas are at the same temperature t. what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.