It takes 86 joules of energy to raise a box 2 meters using the pulley setup shown above. without the pulley, the box can be raised 2 meters using only 82 joules of energy. what could explain this 4-joule difference?

Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Could someone me find the answer to this problem.