题目内容
如图所示,某人用恒力F拉着滑轮包在水平路面上沿直线前进的距离为s,力F与水平路面间的夹角为60°,则此过程中拉力F做的功为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061023124743715962.png)
A.Fs | B.
| C.
| D.
|
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061023124743715962.png)
恒力做功为W=FScosθ=FScos60°=
FS
则A,B、C错误,D正确
故选:D
1 |
2 |
则A,B、C错误,D正确
故选:D
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A.Fs | B.
| C.
| D.
|
1 |
2 |