It is estimated that 7*10^ 6 kg of water pours over the Niagara Falls every second . If the falls are 50 m high , and if all the energy of the falling water could be harnessed, what power would be available? (g=10N/kg)​

Ineed the answers for these promblems i have

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.

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?