A solid copper cube of edges 1 cm is suspended in an evacuated enclosure. Its temperature is found to fall from `100^@C` to `99^@C` in 100 s. Another solid copper cube of edges 2 cm, with similar surface nature, is suspended in a similar manner. The time required for this cube to cool from `100^@C` to `99^@C` will be approximately

A solid cuboid with edges 1 cm, 2 cm and 3 cm is suspended in vacuum, its temperature falls from 100^(0)C to 90^(0)C in 100s. Another solid cuboid of same material and similar surface finish is kept in same enclosure. If sides of couboid are 2 cm, 4 cm and 6 cm, then time ttaken for this cuboid to cool from 100^(0)C to 90^(0)C will be

A body cools from 100^(@)C to 70^(@)C in 8 second. If the room temperature is 15^(@)C , and assuming that Newton's law of cooling holds good, then time required for the body to cool from 70^(@)C to 40^(@)C is

A body cools from 100^(@)C to 70^(@)C in 8 minutes. If the room temperature is 15^(@)C and assuming newton's law of cooling holds good, then time required for the body to cool from 70^(@)C to 40^(@)C is

A body cools from 100° C to 70° C in 8 second. If temperature of surrounding is I 5° C, then time required for body to cool from 70° C to 40° C is

Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated. Each of them is at a temperature 15^(@)C above the surroundings. The ratio of their of loss of heat is

A body cools from 100^@C to 70^@C in 4 minute. If the room temperature is 15^@C the time taken to cool from 70^@C to 40^@C will be

For a liquid its temperature falls from 56 ""^(@) C to 50 ""^(@) C in time 100 sec. cooling constant 0.002 sec^(-1) . Find out temperature of its surrounding .