An object cools from 8 0 ∘ C to 7 0 ∘ C in 3 minutes in a room at 3 0 ∘ C. Find the time in minutes to cool from 6 0 ∘ C to 5 0 ∘ C in the same room (one decimal).

First: 3 10 = k ( 45 ) , so k = 27 2 . Second: t 10 = k ( 25 ) , so t = 5.4 minutes.

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferHard2 min

PhysicsHardnumerical

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

Answer:

5.40

Solution:

First: $\frac{10}{3} = k (45)$ , so $k = \frac{2}{27}$ . Second: $\frac{10}{t} = k (25)$ , so $t = 5.4$ minutes.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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