A 10 kg ball moving at 13 m/s strikes a 20 kg ball at rest. After the collision the 10 kg ball is moving with a velocity of 7m/s. What is the velocity of the second ball?

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

You add 800 ml of water at 20c to 800 ml of water at 80c what is the most likely final temperature of the mixture ? a. 100c b. 60c c. 25 c d.50c