8. Rubbing a plastic bag and a balloon with a cloth gives both objects a net negative charge. The balloon's
charge is -1x10^-10 C and the bag's charge is -1x10^-5 C, and each object has a mass of 0.02 grams.
Wearing insulating gloves, you hold the bag above the balloon and let go. How far above the center of the
balloon will the bag 'levitate'?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p