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【简答题】
如图所示,位面上的物体 A ,在斜向上的恒定拉力作用下,由静止开始向右做匀加速直线运动.已知物体质量为 10 kg, F 的大小为 100 N,方向与速度 v 的夹角为 37°,物体与水平面间的动摩擦因数为0.5, g = 10 m/s 2 .求: (1)第2 s末,拉力 F 对物体做功的功率是多大? (2)从运动开始,物体前进12 m过程中拉力对物体做功的平均功率?(sin 37°=0.6,cos 37°=0.8)
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