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trunguyennc9a1
2 năm trước
Một con đường phủ lớp tuyết có nhiệt độ là 0 độ C và có độ dày đồng đều, biết rằng để làm nóng chảy 1kg tuyết ở 0 độ cần 3,3.105 J. a. Công suất để làm nóng chảy 0,12kg tuyết trong 220s là P1, tính P1. b. Nếu tuyết được làm nóng chảy bởi bức xạ mặt trời thì công suất bức xạ mặt trời cần làm nóng chảy 0,12kg tuyết ở 0 độ C trong 220s là lớn hơn P1, tại sao?
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