The Student Room Group

Specific heat capactiy

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I'm stuck on b) ii. I have no idea what to do :/

Could someone help me out please
Reply 1
I would assume, because you state that no energy is lost to the surroundings in the previous question, that the situation is 100% efficient. Therefore the heat energy is supplied by immersion heater indirectly via the thermal energy supplied by the hot water. Therefore:

42×4.2×103×(5515)=7056000 J42 \times 4.2 \times 10^{3} \times (55-15) = 7056000\text{ J}

Their SHC value is a misprint!
(edited 9 years ago)
Reply 2
got it ty

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