An object has a charge of 4.5 c is it negative or positive

When a tennis ball is dropped onto a tennis court from a height of h the ball rebounds to a height of 3 5 h feet.

What are the coefficients in the equation for the magnetic field component of the wave after the period increases by a factor of 2.

A car drives on a circular track with a constant speed of 84 m/s. The track has a radius of 225 m. What is the centripetal acceleration of the car? What is the acceleration of the car measured in g? What speed would give the car an acceleration of 9.

Describe how kinetic and potential energy change as a diver climbs up to a diving board and then dives into the water below.

What are three things that water variability affects for us?

What happens to the total mechnical energy of the apple as it falls from the tree?

Fair Bonus Question: Derive the equation for gravitational potential energy, starting with the definition of work.

A juggler throws a bowling pin into the air with an initial velocity. Another juggler drops a pin at the same instant.

The liquid electrolyte in the battery typically takes what kind of net charge? a. positive b. negative c. neutral

Relating to Newton's Third Law, action and reaction, what is the reaction when a rocket expels gas, smoke and flames from the nozzle end of the rocket engine?