如图13所示,质量为m的物体在与竖直方向成θ角的推力F作用下,沿竖直墙壁向上匀速运动.若物体与墙面间的摩擦因数为μ,则F的大小是______.拜托托详细过程.
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![如图13所示,质量为m的物体在与竖直方向成θ角的推力F作用下,沿竖直墙壁向上匀速运动.若物体与墙面间的摩擦因数为μ,则F的大小是______.拜托托详细过程.](/uploads/image/z/5076344-56-4.jpg?t=%E5%A6%82%E5%9B%BE13%E6%89%80%E7%A4%BA%2C%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E7%89%A9%E4%BD%93%E5%9C%A8%E4%B8%8E%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91%E6%88%90%CE%B8%E8%A7%92%E7%9A%84%E6%8E%A8%E5%8A%9BF%E4%BD%9C%E7%94%A8%E4%B8%8B%2C%E6%B2%BF%E7%AB%96%E7%9B%B4%E5%A2%99%E5%A3%81%E5%90%91%E4%B8%8A%E5%8C%80%E9%80%9F%E8%BF%90%E5%8A%A8.%E8%8B%A5%E7%89%A9%E4%BD%93%E4%B8%8E%E5%A2%99%E9%9D%A2%E9%97%B4%E7%9A%84%E6%91%A9%E6%93%A6%E5%9B%A0%E6%95%B0%E4%B8%BA%CE%BC%2C%E5%88%99F%E7%9A%84%E5%A4%A7%E5%B0%8F%E6%98%AF______.%E6%8B%9C%E6%89%98%E6%89%98%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B.)
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