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

Two spheres of same material and radius r and 2r are heated to same temperature and are kept in identical surroundings, ratio of their rate of loss of heat is

Two spheres of same material and radius r and 2r are heated to same temperature and are kept in identical surroundings, ratio of their rate of loss of heat is

Metallic spheres of radii 6cm, 8cm and 10cm respectively are melted to form a solid sphere. Find the radius of the resulting sphere.

Two spheres of radii 12 cm and 16 cm have equal charge. The radii of their energies is.

Two solid copper spheres of radii r_1=15cm and r_2=20cm are both at a temperature of 60^@ C. If the temperature of surrounding is 50^@C , then find a. The ratio of the heat loss per second from their surfaces initially. b. the ratio of rates of cooling initially.

Two solid copper spheres of radii r_1=15cm and r_2=20cm are both at a temperature of 60^@ C. If the temperature of surrounding is 50^@C , then find a. The ratio of the heat loss per second from their surfaces initially. b. the ratio of rates of cooling initially.

Two uniform solid spheres made of copper have radii 15 cm and 20 cm respectively. Both of them are heated to a temperature of 70^(@)C and then placed in a region of ambient temperature equal to 45^(@)C . What will be the ratio of the initial rates of cooling of both the spheres?

Two uniform solid spheres made of copper have radii 15 cm and 20 cm respectively. Both of them are heated to a temperature of 70^(@)C and then placed in a region of ambient temperature equal to 45^(@)C . What will be the ratio of the initial rates of cooling of both the spheres?