Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 20

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IMPORTANT

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A cube, a cylinder (of height equal to its diameter) and a sphere, all solid, are made of metal and are of identical mass. If all the three shapes having initial temperature $50 ° C$ are put in a large reservoir of water at $10 ° C .$ Which of the above three shapes cools the fastest?

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Important Questions on Heat Transfer

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NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 21

If a piece of metal is heated to temperature

θ

and then allowed to cool in a room which is at temperature

θ_{0}

, the graph between the temperature

T

of the metal and time

t

will be closest to :

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Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 22

A metallic sphere cools from

50 ° C

to

40 ° C

in

300 s

. If atmospheric temperature around is

20 ° C

, then the sphere's temperature after the nest

5

minutes will be close to:

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Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 23

A body cools from

70 ° C

to

40 ° C

in

5

minutes. Calculate the time it takes to cool from

60 ° C

to

30 ° C

. The temperature of the surroundings is

20 ° C

.

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 24

Newton's law of cooling is used in laboratory for the determination of the

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Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 25

According to Newton's law of cooling, the rate of cooling of a body is proportional to: