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登楼梯比赛时,某同学从一楼均速上了三楼,共用了10秒,该同学登楼是克服重力做功的功率最接近于
W=Fs
p=w/t
一个同学的质量大约为50Kg,所以G=500N
一层楼大约3米,一楼均速上了三楼,说明上升了2x3=6m
w=Fs=500Nx6m=3000J
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英语作文my shadow怎么写
My shadowIN the moring the sun rises behind the montain .My shadow is long.In the afternoon the sun is high in the sky .
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I have the strong desire to learn new knowledge and the Firm determination to learn it well.
I have the strong desire to (acquire) new knowledge and the Firm determination to learn it well.
acquire :得取...