A brass rod is encased in aluminum. what happens to the speed of a sound wave when it moves from the aluminum into the brass? A. it stays the same.

B. it decreases.

C. it falls to zero.

D. it increases

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Abeam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. if the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? the value of q = -1.6 × 10-19 coulombs.

How much work would it take to move a coulomb charge across a 4 volt potential difference?