Arefrigerator is removing heat from a cold medium at 3 °c at a rate of 7200 kj/h and rejecting the waste heat to a medium at 30 °c. if the coefficient of performance of the refrigerator is 2, the power consumed by the refrigerator is (a) 0.1 k w (b) 2.0 kw (c) 0.5 kw (d) 5.0 kw (c) 1.0kw

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Fluids at rest possess no flow energy. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?