Why do electric charges that move through a magnetic field produce an electric current?
A. The magnetic field pushes negative charges and positive charges
in opposite directions.
B. The magnetic field exerts a force only the negative charges in
the wire.
O C. The magnetic field exerts a force on only the positive charges in
the wire.
D. The magnetic field pushes negative charges and positive charges
in the same direction.

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Arrange the images in order to show how lake-effect snow occurs.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.