Physics problem： how to do, thanks?
回答 (1)
2020-04-14 10:55 pm
✔ 最佳答案
Let m - mass of boiling water to be addedspecific heat capacity of water=4.2 J kg⁻¹ ⁰C⁻¹
heat lost by boiling water = heat gained by cold water + heat gained by cup
m×4.2×(100-40)=0.1×4.2×(40-10)+0.04×700×(40-10)
252m=12.6+840
∴ m=3.38 kg (to 2 dec.pl.)
收錄日期: 2021-04-24 07:51:17
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