A145 g sample of copper metal at 100.0c is placed into 250.0 g of water at 25.0 °c in a calorimeter. when the system reaches thermal equilibrium, the temperature of the water in the calorimeter is 28.8c. assume the calorimeter is perfectly insulated. what is the specific heat of copper?

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