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Thermal Expansion

cooling rate ...

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cooling rate of a sphere of 600 K at external environment (200 K) is R. When the temperature of sphere is reduced to 400 K then cooling rate of the sphere becomes : (1) 3/16 R (2) 16/3 R (3) 9/27 R (4) None

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Q. A sphere at temperature 600 K is placed in environment of temperature 200 K, its cooling rate is H. If the temperature is reduced to 400 K, the cooling is same environment will be :

Q. Assertion :A solid sphere and a hollow sphere of same material and same radius are kept at same temperatures in atmosphere. Rate of cooling of hollow sphere will be more. Reason: If all other conditions are same, then rate of cooling is inversely proportional to mass of body.

Q. Four spheres

A, B, C

D

of different metals but of same radius are kept at same temperature. The ratio of their densities is

2 : 3 : 5 : 1

. If specific heats of their materials are in the ratio

3 : 6 : 2 : 4

, which sphere will show initially the fastest rate of cooling?

Q. Four spheres

A, B, C

D

of different metals but of same radius are kept at same temperature.The ratios of their densities and specific heats are

2 : 3 : 5 : 1

3 : 6 : 2 : 4 .

Which sphere will show the fastest rate of cooling (initially)?

Q. Question 20
Volumes of two spheres are in the ratio 64 : 27 , then the ratio of their surface area is
(A) 3 : 4
(B) 4 : 3
(C) 9 : 16
(D) 16 : 9

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