Two rods of the same metal and the same cross-section have lengths 0.5 m and 0.9 m. The first has end temperatures 8 0 ∘ C and 5 0 ∘ C, and the second 13 0 ∘ C and 8 5 ∘ C. Which rod conducts heat at the larger rate?

The rate is proportional to the temperature gradient. First: 0.5 30 = 60 . Second: 0.9 45 = 50 ∘ C m − 1 . The first rod is larger. A.

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

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Two rods of the same metal and the same cross-section have lengths 0.5 m and 0.9 m. The first has end temperatures $8 0^{\circ}$ C and $5 0^{\circ}$ C, and the second $13 0^{\circ}$ C and $8 5^{\circ}$ C. Which rod conducts heat at the larger rate?

Options:

Answer:

Solution:

The rate is proportional to the temperature gradient. First: $\frac{30}{0.5} = 60$ . Second: $\frac{45}{0.9} = 50$ $^{\circ}$ C $m^{- 1}$ . The first rod is larger. A.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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