Which description best matches the image below of a hand that is using the right- hand palm rule?

A. A proton moving away from you in a magnetic field that points up will experience a force left.

B. A proton moving up in a magnetic field that points left will experience a force away from you.

C. A proton moving left in a magnetic field that points up will experience a force away from you.

D. A proton moving away from you in a magnetic field that points left will experience a force up.

Which best represents the law of conservation of mass ?

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?