Using Stefan's law,obtain expression for the rate of loss of heat by a black body in cooler surroundings. How is this expression modified, if the body is not black?

Compare the rate of emission of heat by a black body at 327^@C with the rate of emission of heat of same body at 27^@C .

Obtain an expression for torque acting on rotating body with constant angular acceleration.

Answer the following questions: Obtain an expression for the work done by a force acting on a body when the angle between the force and the dispalcemnt of the body is 0.

State law of black body radiation.

Derive an expression for heat produced in a conductor using Joule's law of heating.

Using the law of conservation of energy, obtain the expression for the escape velocity.

Define escape velocity. Derive an expression for the escape velocity of an object from the surface of the earth. OR Define escape velocity of a body at rest on the earth's surface. Obtain an expression for the same and show that it is independent of the mass of the body. OR Define escape velocity of the body. Obtain an expression for the escape velocity when the body is at rest on the surface of the earth and show that it is independent of the mass of the body.

Obtain an expression for total K.E. of rolling body in the from 1/2MV^2[1+K^2/R^2]

Compare rates of loss of heat by the body at temperature 527^@C and 127^@C . Temperatue of surrounding is 27^@C .

Rates of emission of heat by perfectly black body maintained at temperatures 27° C and 927° C are in ratio