Which of the following changes will result in a weaker electromagnet.

A. Using a longer wire

B. Using fewer coil of wire

C. Using a higher voltage

D. Using a shorter nail

What are the different kinds of forces?

What is the definition of "potential energy"? A. Energy that is developed by an object while it's in motion B. The energy that a piece of matter has because of its position or because of the arrangement of parts C. An object that stays at rest D.

In the equation, what do the terms vx, v0x, x, and x0 stand for respectively?

The space velocity of a star is 120 km/s and its radial velocity is 72 km/s. what is its tangential velocity?

What are the movements of boiling water? I'm looking for if they speed up, like that sort of thing. Not how, not why, just what are the movements.

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.

A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the ground 10.3 m from the net, and after Serena hit the ball it flew over the 0.