In a room at 2 5 ∘ C a body cools from 7 0 ∘ C to 6 8 ∘ C in 3 minutes. Find the time in minutes to cool from 5 0 ∘ C to 4 8 ∘ C (one decimal).

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

In a room at $2 5^{\circ}$ C a body cools from $7 0^{\circ}$ C to $6 8^{\circ}$ C in 3 minutes. Find the time in minutes to cool from $5 0^{\circ}$ C to $4 8^{\circ}$ C (one decimal).

Answer:

5.50

Solution:

The time is inversely proportional to the mean excess: first $44$ , second $24$ . $t = 3 \times \frac{44}{24} = 5.5$ minutes.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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