In an effort to stay awake for an all-night study session, a student
makes a cup of coffee by first placing a 200-W electric immersion
heater in 0.300 kg of water. 79819.5 J heat must be added to the
water to raise its temperature from 18.5 degree celsius to 82.0 degree
celsius.
How much time is required? Assume that all of the heater's power goes
into heating the water.
A cup of coffee
2012-11-08 9:54 pm
回答 (1)
2012-11-08 10:52 pm
✔ 最佳答案
The heater produces 200 w, i.e. 200 J in one second. If all of the heat produced goes to heat up the water, then time needed= 79819.5/200 s = 399 s
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