Calculate the quantity of heat to be transferred in BTU to 3 kg of brass to raise its temperature from 26.7°C to 239.9°C The specific heat of the brass is 0.394 kJ/kg k.

How much mass of aluminium materials required (in kg) with a specific heat capacity of 0.82 kJ/KgK that absorbs the heat energy of 592 kJ and it has a temperature change of 62 K.

Contvert to SI Units  52 Btu/lbmoF to J/kgoC

The total consumption of electrical energy in the United States is about 1.0 1019joules per year.What is the average rate of electrical energy consumption in watts?If the population of the United States is 300 million, what is the average rate of electrical energy consumption per person?The sun transfers energy to the earth by radiation at a rate of approximately 1.0 kW per square meter of surface. If this energy could be collected and converted to electrical energy with 40 % efficiency, how great an area (in square kilometers) would be required to collect the electrical energy used by the United States?

A heat pump with the COP of 3.8 supplies heat at the rate of 289 kJ/min. If a bar heater was used and the electricity cost R2.50 per kWh peak and 200 cents off-peak , how much would be saved using the heat pump for 7 days if the off-peak hours are from 22:00 hr to 6:00 hr for every day of the week.  Provide the answers to 2 decimal places and insert the unit in Rands after the answer