A coal power station transfers 3.0×10^12 J by heat from burning coal and transfers 1.5×10^12 J by heat into the environment. What is the efficiency of the power station?

Anybody wanna ? (picture included? )

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.