Students have a block of unknown material and plan to determine the resistivity of the material. The students create a circuit by placing the block in series with a voltage source. The students use a voltmeter, ammeter, and meterstick to gather the data listed in the table above. What other measurement must the students make to determine the resistivity of the material, and why?

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

The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)