32. The kiloton, which is used to measure the energy released
in an atomic explosion, is equal to 4.2 x 1012 J (approxi-
mately the energy released in the explosion of 1000 tons
of TNT). Recalling that 1 kilocalorie of energy raises the
temperature of 1 kg of water by 1°C and that 4184 joules
is equal to 1 kilocalorie, show that the energy released by
a 20-kiloton bomb is enough to heat 4.0 X 108 kilograms
of water (nearly half a million tons) through 50°C.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.