A metal cube of each side 2 cm long emits 0.16 kcal of heat in 100s. Calculate the emissive power of the cube in joule at that temperature. `J = 4200 J//kcal`.

A metal cube of each side 0.05 m long emits 0.6k cal in 80 seconds, Calculate the emissive power of its surface.

A metal cube of length 10 cm radiates heat at the rate of 60 watt. Find its emissive power of a perfectly black body at that temperature.

A metal cube has each side 2.5 cm long and radiates 0.36 kcal//min . What is the emissive power of its surface? If the emissivity of its surface is 0.4, what would be the emissive power of the cube if it were perfectly black?

A body of surface are 15xx10^(-3)m^2 emits 0.3 kcal in 40 second at a temperature 70^(@)C . The emissive power of the surface at that temperature is

A metal cube has each side of length 1 m losses all its energy at a rate of 3000 watt. If the emissity is 0.4, Find its temperature (Given:a= 5.767xx10^-8J//m^2sk^-1 )

The energy of 6000 J is radiated in 5 minutes by a body of surface area 100 cm^2 . Find emissive power of a body.

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s^-1 in a uniform horizontal magnetic field of magnitude 3.0 xx 10^-2 T. Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 ohm, calculate the maximum value of current in the coil Calculate the average power lose due to the Joule heating .Where does this power come from ?

Specific latent heat of vaporization of water is 2.26 xx 10^6 J/kg. Calculate the energy needed to change 5.0 g of water into steam at 100^@ C

Forces of 100 N each are applied in opposite direction on the upper and lower faces of a cube of side 20 cm. The upper face is shifted parallel to itself by 0.25 cm. If the side of the cube were 10 cm, then the displacement would be