Two circular rods, one steel and the other copper, are both 0.780 m long and 1.50 cm in diameter. each is subjected to a force with magnitude 4350 n that compresses the rod. what is the difference in the length of the two rods when compressed?

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

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