How much energy is needed to raise the temperature of 2.3 kg of aluminum from 5 °C to 15 °C? The specific heat capacity of aluminum is 897 J/kg°C. 20.631)
-20.631
39.78
39.783

Does heating a metal wire increase or decrease its electrical resistance? why?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)

2) why do satelites not fall while revolving around the earth?