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题在盛水的池底有一段长3.4m.高0.5m的斜面 AB,如图所示,质量为1kg 的实心铁块,在沿斜面方向的拉力 F 的作用下,以0.5m/s 的速度从斜面底端拉至顶端,若斜面的机械效率为80%.求:(1)沿斜面
There is a section AB with a length of 3.4m and a height of 0.5m at the bottom of the water tank. As shown in the figure, a solid iron mass with a mass of 1kg is applied at a force of 0.5m/s under the action of the pulling force F along the direction of the slope. The speed is pulled from the bottom to the top of the slope, if the mechanical efficiency of the slope is 80%. Find: (1) along the slope