A metal sphere cools at the rate of `1.6^@C//min` when itstemperature is `60^@C`. At what rate will it cool when its temperature is `50^@C`? The temperature of surroundings is `30^@C`.

A metal sphere cools at the rate of 1.6^@ C /min when its temperature is 70^@ C . At what rate will it cool when its temperature is 40^@ C. The temperature of surroundings is 30^@ C.

A body cools at the rate of 4^@C per minute when its temperature is 70^@C . What will be its rate of cooling when its temperature is 50^@C ? (Assume temperature of surrounding to be 30^@C )

A metal sphere cools at the rate of 0.05^@ C/s when its temperature is 70^@ C and at the rate of 0.025^@ C /s when its temperature is 50^@ C . Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is 40^@C .

A black body radiates 3 J/cm^2 s when its temperature is 127^@C .How much heat will be radiated /cm^2 s when its temperature is 527^@C ?

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

A body cools at the rate of 1.5 °C/min when its temperature is 30 °C above that of the surrounding. At what temperature above the surrounding will it cool at the rate of 1 °C/min?

Rate of cooling of a body is 0.2^@C/min , when excess temperature is 20^@C . The proportionality constant is

A metal sphere cools from 80^@C to 60^@C in 6 minutes. How much time will it take to cool from 60^@C to 40^@C if the room temperature is 30^@C ?

Compare the rate of loss of heat from a metal sphere at 827^@C with the rate of loss of heat from the same sphere at 427^@C , if the temperature of the surrounding is 27^@C .