Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's Law: If, the distance between the particles is tripled and each charge is doubled, the force becomes a. 3/4 times b. 4/3 times c. 4/9 times d. 9/4 times

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

What is friction? how does it affect the motion of an object?

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.