# Physics

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Find the heat that flows in 1 s through a lead brick 18 cm long if the temperature difference between the ends of the brick is 6.8° C. The cross-sectional area of the brick is 14 cm2.

• Physics -

Look up the thermal conductivity of lead, k, and use the heat conduction equation.

Q = k*A*(dT/dX)*1 second

A = 14 cm^2
dT/dX is the temperature gradient, 0.378 degC/cm

k should be in units of calories or joules per (degC*cm)

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