revision why is the body of the pan metallic and the handle plastic? (2)
TRANSCRIPT
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REVISION
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Why is the body of the pan metallic and the handle plastic? (2)
PLASTIC HANDLE
METAL BODY
STEEL
COPPER
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How does a light coloured fridge keep heat from entering it? (1)
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Why is it important that the air is trapped in any type of insulation (1)
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Why is the heating element placed at the bottom of a kettle?
(2)
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Why are a lot of toasters silver? (1)
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How do foam containers keep food warm?.(3)
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Explain how cavity wall insulation keeps houses warm (3)
WALLS
CAVITY WALLINSULATION
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Why can these people float in the air? (2)
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Why is the bottom of the pan made of copper instead of steel?
(1)
PLASTIC HANDLE
METAL BODY
STEEL
COPPER
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Why is the back panel of the fridge black? (2)
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A copper pan has a specific heat capacity of 400KJ/ kg oC. If its mass is 0.5kg how much heat is required to increase it’s temp by 5 degrees? Explain how you work it out. (1)
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Complete the table.
INSULATION COSTSAVING /
YEAR
LOFT
PAYBACKTIME
£200 £50 ?
DRAUGHT £20 £40 ?
WALL £400 ? 4 years
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How does the heat get through the pan? (3)
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How does the heat get from the bottom of the pan to the egg? (2)
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100g of ice is put in a 200g glass of water. If the specific latent heat of water is 4200 J/g how much energy is required to heat the ice? Explain how you work it out. (1)
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How does a puffa jacket keep you warm? (3)
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Why do feet feel warmer on carpets than laminate flooring (3)
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How does a solar cooker work? (1)