Question

Liquid is filled in a vessel which is kept in a room with temperature 20° C. When the temperature of the liquid is 80° C, then it loses heat at the rate of 90 cal/s. What will be the rate of loss of heat when the temperature of the liquid is 40° C?

Options

• 180 cal/s

• 40 cal/s

• 30 cal/s

• 20 cal/s

Answer 1

30 cal/s

Explanation:

`((Delta"Q")/"t") prop Delta theta`

`((Delta"Q")/"t")_1/(Delta"Q"/"t")_2 = (Deltatheta_1)/(Deltatheta_2)`

`90/((Delta"Q")/"t")_2 = (80 - 20)/(40 - 20)`

`((Delta "Q")/"t")_2 = 30  "cal/s"`