An object at rest has no net force acting on it.

a. True

b. False

Like magnetism, static electricity can attract and repel. True False

A ball has an electric charge of + 1.5 * 10-9 coulombs. At what distance from the ball's center is the electric field strength equal to 5.8 * 105 newtons/coulomb?

For each situation, identify when sound would travel faster and why? a. Outside on a winter day or outside on a summer day? b. Through water or air? c. When air pressure is high or low? d.

A woman with a mass of * kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.550 rev/s about an axis through its center. the disk has a mass of * kg and a radius of * m.

What happens to gravitational potential energy as a boulder falls off a cliff?

What is the oxidation state of a hydrogen atom bound to an iron atom.?

What evidence can you present for the possibility of time travel?

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?