Q1. A cord is used to vertically lower an initially stationary block of mass M kg at a constant downward acceleration of g/4. The block has fallen a distance d. (Use any variable or symbol stated above as necessary.)
(a) Find the work completed by the cord's force on the block.
(b) Find the work completed by the weight of the block.
(c) Find the kinetic energy of block.
(d) Find the speed of block.
Q2. A copper block is removed from a 300^0 C oven and dropped into 1 L of water at 20.0^0 C. The water quickly reaches 25.5^0 C and after that remains at that temperature. What is the mass of copper block?