滑轮计算题精选
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1、“龙门吊”是港口、货场中常见的起重设备，其滑轮组部分如图所示．现用此装置将地面上一个重为3×104N、与地面的接触面积为1.2m2的重物匀速吊到3m的高处，滑轮组钢索自由端的拉力为1×104N．请解答以下问题：
(1)重物被吊起前对地面的压强是多大？
(2)提升重物过程中滑轮组的机械效率是多少？
(3)若再用此装置提升2×104N的重物时，它的机械效率将_____（选填“变大”、“变小”或“不变”）．...点击查看全部>>
(1)重物被吊起前对地面的压强是多大？
(2)提升重物过程中滑轮组的机械效率是多少？
(3)若再用此装置提升2×104N的重物时，它的机械效率将_____（选填“变大”、“变小”或“不变”）．...点击查看全部>>
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