You have two rods a and b, both made of a nonconducting material. initially, neither rod is charged. a sphere carrying 100 units of surplus positive charge is placed close to the left end of rod a. one end of rod b is touched to the right end of rod a for some time interval and then removed.

what is the final charge on rod b?

a) the charge is zero.

b) the charge is negative. t

c) the charge is positive.

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.

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s

What types of radiation make up the electromagnetic spectrum?