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An ice box made of Styrofoam (Thermal co...

An ice box made of Styrofoam (Thermal conductivity `= 0.01 J m ^(-1) s ^(-1) K ^(-1))` is used to keep liquids cool. It has a total wall area including lid of `0.8 m^(2)` and wall thickness of 2.0 cm. A bottle of water is placed in the box and filled with ice. If the outside temperature is 30°C the rate of flow of heat into the box is : (in `J-s ^(-1)`):

A

16

B

14

C

12

D

10

Text Solution

Verified by Experts

The correct Answer is:
C
`H = (Q)/(t) = ( KA ( theta _(1) - theta_(2)))/( d) = ( 0.01 xx 0.8 ( 30 ^(@) - 0^(@)))/( 2 xx 10 ^(-2))= 12 J -s ^(-1)`
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