A student uses the right-hand rule as shown. What is the direction of the magnetic field in front of the
wire closest to the student?
a. up
b. right
c. down
d. left

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).

Ibelieve that the correct answer is: c. along plate boundaries

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Ibelieve the answer is d. densityhope my answer has you : )