Find the case where heat flow can take place in between the two bodies. Given are the temperatures of both the bodies, measured with two different scales.

B o d y A : 0 ° C B o d y B : 273 K

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B o d y A : 37 ° C B o d y B : 98.6 ° F

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B o d y A : 100 ° C B o d y B : 212 ° F

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B o d y A : 10 ° C B o d y B : 212 ° F

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Solution

The correct option is D $B o d y A : 10 ° C B o d y B : 212 ° F$
Heat flows from a body at a higher temperature to a region at lower temperature. When there is no difference in temperatures, no heat flow will take place. We know the following conversion of scales,
$F = (C \times \frac{9}{5}) + 32 C = (F - 32) \times \frac{5}{9} K = C + 273$
Using these formulae we get,
$(a) 0 ° C = 273 K (M e l t i n g p o i n t o f i c e) (b) 37 ° C = 98.6 ° F (N o r m a l b o d y t e m p e r a t u r e) (c) 100 ° C = 212 ° F (B o i l i n g p o i n t o f w a t e r)$
but
$(d) 10 ° C = 50 ° F sin c e, F = 9 / 5 (° C) + 32 F = 9 / 5 \times 10 + 32 F = 50 ° F$ Since the temperatures are not equal in this case. Heat flow happens from body B and A.

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Question 3

Paheli and Boojho measured their body temperature. Paheli found her’s to be ${98.6}^{\circ} F$ and Boojho recorded $37^{\circ} C$ . Which of the followng statement is true?

(a) Paheli has a higher body temperature than boojho.

(b) Paheli has a lower body temperature than boojho

(d) Both are suffering from fever.

Q. Statement 1: Heat always flows from a body with higher heat energy to a body with lower heat energy.

Statement 2: Heat always flows from a body with a higher temperature to a body with a lower temperature.

Q. Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved?

(a) Sum of the temperatures of the two bodies
(b) Total heat of the two bodies
(c) Total internal energy of the two bodies
(d) Internal energy of each body

Q. Heat flows from one body to another if there is a difference in between the two bodies.

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