如图在光滑的水平面上,物块在恒力F=100N的作用下从A点运动到B点,不计滑轮的大小,不计绳与滑轮的质量及绳、滑轮间的摩擦,H=2.4 m,α=37°,β=53°,求拉力F做的功.答案是100J.想问下怎么用定
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![如图在光滑的水平面上,物块在恒力F=100N的作用下从A点运动到B点,不计滑轮的大小,不计绳与滑轮的质量及绳、滑轮间的摩擦,H=2.4 m,α=37°,β=53°,求拉力F做的功.答案是100J.想问下怎么用定](/uploads/image/z/4478071-31-1.jpg?t=%E5%A6%82%E5%9B%BE%E5%9C%A8%E5%85%89%E6%BB%91%E7%9A%84%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%2C%E7%89%A9%E5%9D%97%E5%9C%A8%E6%81%92%E5%8A%9BF%EF%BC%9D100N%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%8B%E4%BB%8EA%E7%82%B9%E8%BF%90%E5%8A%A8%E5%88%B0B%E7%82%B9%2C%E4%B8%8D%E8%AE%A1%E6%BB%91%E8%BD%AE%E7%9A%84%E5%A4%A7%E5%B0%8F%2C%E4%B8%8D%E8%AE%A1%E7%BB%B3%E4%B8%8E%E6%BB%91%E8%BD%AE%E7%9A%84%E8%B4%A8%E9%87%8F%E5%8F%8A%E7%BB%B3%E3%80%81%E6%BB%91%E8%BD%AE%E9%97%B4%E7%9A%84%E6%91%A9%E6%93%A6%2CH%EF%BC%9D2.4+m%2C%CE%B1%EF%BC%9D37%C2%B0%2C%CE%B2%EF%BC%9D53%C2%B0%2C%E6%B1%82%E6%8B%89%E5%8A%9BF%E5%81%9A%E7%9A%84%E5%8A%9F.%E7%AD%94%E6%A1%88%E6%98%AF100J.%E6%83%B3%E9%97%AE%E4%B8%8B%E6%80%8E%E4%B9%88%E7%94%A8%E5%AE%9A)
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