1. Energy cannot be created or destroyed. This is called the principle of _________ of _________.
2. How much energy is needed to heat up 1-kg water from 0 ℃ to 100℃?
3.Suppose we heat up 1-kg water by 10℃. If we tansfer the same amount of energy to 2-kg water, how much will the temperature rise?
Phyics既Energy`
2010-11-15 1:39 am
回答 (1)
2010-11-15 4:31 am
✔ 最佳答案
1. conservation; energy2. Heat needed = 1 x 4200 x 100 J = 420 000 J
where 4200 J/kg-C is the specific heat capacity of water
3. 5 degree C, since the energy is now spreaded over to 2 kg of water. Hence, the temperature rise = 10/2 'C = 5'C
收錄日期: 2021-04-29 17:43:54
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