You are standing on the school balcony 5 m above the floor it was a stone up into the air at speed of 18 m per 2nd the stone free falls and eventually land on the 1st floor below you. A. How far above the ground will the stone be at the top of its path? B. What was the velocity of the stone as it reaches the ground? C. How much time did it take the stone to free fall fr ok m the moment you let go until it hit the ground?

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 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? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false