用一个重10牛的动滑轮来提升50牛的物体,实际上工作所用的拉力为30牛还是35牛,请说解析
用一个重10牛的动滑轮来提升50牛的物体,实际上工作所用的拉力为30牛还是35牛,请说解析
物理人气:423 ℃时间:2019-12-09 23:45:29
优质解答
30N.F= 1/2 G物+G动=1/2 X70N=35N.
我来回答
类似推荐
猜你喜欢
- 1左边一个王,右边一个去,这个字怎么念?
- 2Black people are born equal to the white.为什么不用equally而用equal
- 3she left me she did't say goodbye合并
- 4A young man walked into the house.There were some flowers in his hands.
- 5若不论X取任何实数,分式 X的平方+2X+m / 1 都有意义,则m=_?
- 6what did the writer feel when he was told to see his boss ?
- 7一个长方体食品盒底面是一个边长20厘米的正方形,高是15厘米.在它的侧面贴一圈商标纸,商标纸的面积至少
- 8先将x的平方+4x+4分之x的平方-1÷(x-1)乘x-1分之x的平方+2x化简
- 9二氧化硅的SO2叫做什么,为什么不叫分子式,只有分子晶体才可以叫做分子式吗?(二氧...
- 10做一个容积为256L的方底无盖水箱,它的高为多少时材料最省?