Two identical balls collide one was initially at rest. after the collision one of the balls has a velocity of 3 m/s south. the other has a velocity of 4 m/s west. what was the velocity of the ball that was moving before the collision

Which best contrasts electric doorbells and audio speakers? Doorbells involve rapid changes in the direction of current, and speakers do not. Speakers involve rapid changes in the direction of current, and doorbells do not.

What is the formula to calculate the readings on an ammeter?

Who was brilliant mathematician used the data of tycho brahe to prove accuracy of copernicus basic ideas of motion of planets?

Lisa was choosing between three alternatives: working on her job that pays her $60; writing a term paper which she values at $40; or going out with a friend, which she values at $80. The opportunity cost of going out with her friend is

Being rejected by a peer group can negatively influence one's self-esteem. a. True b. False

Scientists can find the absolute age of a rock by using a uranium 235 dating b carbon 14 dating c carbon 12 dating d relative dating

What do scalars measure force acceleration magnitude velocity

Why do metals differ in specific heat? why is Al much higher than gold

Witch kind of force do you exert on an object when you pull towards you A-Applied force B-Attractive force C-Drag force D-Normal force

a solid sphere is rolling without slipping along a horizontal surface with a speed of 5.5 meters per second when it starts up a ramp that makes an angle of 25 degrees with the horizontal what is the speed of the sphere after it has Road 3M up the