1.

A 39.1-kg block of ice at 0 "C is sliding on a horizontal surface. The initial speed of the ice is 6.24 m/s and the final speed is 3.33 m/s. Assume that the part of the block that melts has a very small mass and that all the heat generated by kinetic friction goes into the block of ice, and determine the mass of ice that melts into water at 0 *C.If the price of electrical energy is $0.11 per kilowatt-hour, what is the cost of using electrical energy to heat the water in a swimming pool (12.0 m x 9.00 m x 1.50 m) from 14 to 28 "C