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1.A heater supplies 500kj (500,000J) over 10 minutes.
a.The latent heat of ice is 340,000J/kg, how much ice could melt in 10 minutes?
b.The latent heat of zinc is 100,000 J/kg, how much zinc would melt in 10 minutes?
2.Dave puts 30g (0.030kg) of ice into his lemonade to cool it. The latent heat of ice is 340,000J/kg, how much energy did the ice cubes gain from the lemonade?
3. A 3.0kW kettle is designed to cut off when the water starts to boil, unfortunately it doesn’t work correctly and boils the water for 30 seconds longer than it is supposed to. The electrical energy used during this time is 100J. If the specific latent heat of vapourisation is 2,300,000J/kg, what is the mass of the water boiled away?
4. The specific latent heat of ice is 340,000J/kg, the specific latent heat of steam is 2,300,000J/kg and the specific heat capacity of water is 4,200j?kg/C. Calculate the energy needed to convert 2kg of ice at 0C to steam at 100C
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thankyou in advance you will get 20 points for it
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