如图一所示,一质量为m的小球,用长为L的轻绳O点,小球在水平拉力F作用下从最低位置P点由静止移动到Q点时速度为V,则此过程中F做的功为?答案是mgL(1-cosθ)+1/2mv²?如图二所示,质量为m的小球,
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![如图一所示,一质量为m的小球,用长为L的轻绳O点,小球在水平拉力F作用下从最低位置P点由静止移动到Q点时速度为V,则此过程中F做的功为?答案是mgL(1-cosθ)+1/2mv²?如图二所示,质量为m的小球,](/uploads/image/z/12329976-48-6.jpg?t=%E5%A6%82%E5%9B%BE%E4%B8%80%E6%89%80%E7%A4%BA%2C%E4%B8%80%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B0%8F%E7%90%83%2C%E7%94%A8%E9%95%BF%E4%B8%BAL%E7%9A%84%E8%BD%BB%E7%BB%B3O%E7%82%B9%2C%E5%B0%8F%E7%90%83%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%8B%89%E5%8A%9BF%E4%BD%9C%E7%94%A8%E4%B8%8B%E4%BB%8E%E6%9C%80%E4%BD%8E%E4%BD%8D%E7%BD%AEP%E7%82%B9%E7%94%B1%E9%9D%99%E6%AD%A2%E7%A7%BB%E5%8A%A8%E5%88%B0Q%E7%82%B9%E6%97%B6%E9%80%9F%E5%BA%A6%E4%B8%BAV%2C%E5%88%99%E6%AD%A4%E8%BF%87%E7%A8%8B%E4%B8%ADF%E5%81%9A%E7%9A%84%E5%8A%9F%E4%B8%BA%3F%E7%AD%94%E6%A1%88%E6%98%AFmgL%281-cos%CE%B8%EF%BC%89%2B1%2F2mv%26%23178%3B%3F%E5%A6%82%E5%9B%BE%E4%BA%8C%E6%89%80%E7%A4%BA%2C%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B0%8F%E7%90%83%2C)
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