Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 × 106 kg of coal each day. the heat produced by the combustion of coal is 3.3 × 107 j/kg. the steam that drives the turbines is at a temperature of 300°c, and the exhaust water is at 37°c. (a) what is the overall efficiency of the plant for generating electric power

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.