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6 August, 15:05

A 81 cm long brass rod has a diameter of 3 mm. The temperature of one end is 50 degrees higher than the other end. How much heat is conducted in 1.8 mins?

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  1. 6 August, 17:45
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    5.14 J

    Explanation:

    l = 81 cm = 0.81 m

    diameter = 3 mm

    Radius, r = 1.5 mm = 1.5 x 10^-3 m

    Change in temperature, T2 - T1 = 50 degree

    t = 1.8 minutes = 1.8 x 60 = 108 s

    k = 109 W/mk

    Heat transfer = K A (T2 - T1) t / l

    H = 109 x 3.14 x 1.5 x 10^-3 x 1.5 x 10^-3 x 50 x 108 / 0.81

    H = 5.14 J
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