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A body cools in a surrounding of constan...

A body cools in a surrounding of constant temperature `30^@C` Its heat capacity is `2 J//^@C`. Initial temeprature of cooling is valid. The body cools to `38^@C` in 10 min
The temperature of the body In `.^@C` denoted by `theta`. The veriation of `theta` versus time t is best denoted as

A

B

C

D

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The correct Answer is:
D
`( dtheta)/(dt) = (-kA)/("ms") (T-T_(0))` magnitude of slope will decrease with time.
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ALLEN-GEOMETRICAL OPTICS-SOME WORKED OUT EXAMPLES
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  2. A body cools in a surrounding of constant temperature 30^(@)C. Its he...

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  3. A body cools in a surrounding of constant temperature 30^@C Its heat c...

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  4. A body cools in a surrounding of constant temperature 30^(@)C. Its he...

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  5. In an industrial process 10 kg of water per hour is to be heated from ...

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  8. A clock pendulum made of invar has a period of 2 s at 20^(@)C. If the ...

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  9. A body cools from 50^(@)C to 49.9^(@)C in 5 sec. it cools from 40^(@)C...

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  10. A cylinder of cross-section area. A has two pistons of negligible mass...

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  11. A vessel contains 1 mole of O(2) gas (molar mass 32) at a temperature ...

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  12. One mole of gas is taken from state A to state B as shown in figure. W...

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  13. A container having base area A(0). Contains mercury upto a height l(0)...

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  14. The relation between internal energy U, pressure P and volume V of a g...

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  15. One mole of an ideal monatomic gas undergoes the process P=alphaT^(1//...

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  16. One mole of a monoatomic gas is enclosed in a cylinder and occupies a...

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  17. Two taps A and B supply water at temperature 10^(@)C and 50^(@)C resp...

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  18. Two identical metal plates are welded end to end as shown in - (i) . 2...

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  19. Choose the correct mirror image of

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  20. A point object O can move along vertical line AB as shown in figure . ...

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