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Standard VIII
Physics
Sources of Heat
Anice box use...
Question

An ice box used for keeping eatable cold has a total wall area of 1 m2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/metre-0C. It is filled with ice at 0C along with eatables on a day when the temperature is 300C. The latent heat of fusion of ice is 334×103 joule/kg. The amount of ice melted in one day is ( 1day = 86.400 s)


A

776 g

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B

7760 g

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C

11520 g

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D

1552 g

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Solution

The correct option is D

1552 g




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An ice box used for keeping eatable cold has a total wall area of 1 m2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/metre-0C. It is filled with ice at 0C along with eatables on a day when the temperature is 300C. The latent heat of fusion of ice is 334×103 joule/kg. The amount of ice melted in one day is ( 1day = 86.400 s)


Q.

An ice box used for keeping eatable cold has a total wall area of 1metre2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01joule/metre−∘C. It is filled with ice at 0∘ along with eatables on a day when the temperature is 30∘. The latent heat of fusion of ice is 334×103joules/kg . The amount of ice melted in one day is
(1 day =86,400 seconds )


Q. An ice box used for keeping eatables cool has a total wall area of 1 m2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01 J/moC. It is filled with ice along with eatables on a day when the temperature is 30oC. The latent heat of fusion of ice is 334×102 J/kg. The amount of ice melted in one day is (1 day=86,400 seconds):
Q. A cubical box is used to keep drinks cold in a bus. Surface area of each face of cubical box is 0.8 m2 and each wall has thickness 2 cm. It is filled with ice and water which remains at 00C. Temperature at outside each wall is 300C, then
(Thermal conductivity of material of box = 1×10−2 W/m-k and latent heat of fusion of ice = 3.2×105 J/kg)
Q. An icebox almost completely filled with ice at ˚0C is dipped into a large volume of water at 2˚0C. The box has walls of surface area 2400cm2, thickness 2.0mm and thermal conductivity 0.06W/m−C. Calculate the rate at which the ice melts in the box. Latent heat of fusion of ice = 3.4×105J/kg
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