本课配套习题挑战模式1/5
单选题
难度系数:
1.小明用如图所示的滑轮组,将重为1.5N的物体匀速提升到一定高度,在此过程中,手拉力的大小实际应该是( )
A: 小于0.75N |
B: 等于0.75N |
C: 大于0.75N |
D: 等于0.5N |
一次做对,真牛!
+5奖励规则>
- 提示1:IOayoeacieivtOW/veeVpee7s+mHjeWPiuaRqeaTpg==
- 提示2:IOWcqOS4jeiAg+iZkee7s+mHjeWPiuaRqeaTpueahOaDheWGteS4i++8jOaLieWKm+etieS6jjAuNzVO
- 提示3:IOeOsOWunuS4re+8jOe7s+WtkOi/mOWPl+WIsOaRqeaTpuWKm++8jOaJgOacieWkp+S6jjAuNzVO
- 答案:Qw==
PGRpdj7lnKjmj5DljYfph43niannmoTov4fnqIvkuK3vvIzmi4nlipvkuI3kvYbmj5DnnYDniankvZPvvIzov5jmj5DnnYDliqjmu5Hova7vvIzov5jopoHlhYvmnI3nu7PlrZDlkozmu5Hova7pl7TnmoTmkanmk6blipvvvIzmiYDku6U8aW1nIHdpZHRoPTQzIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzgzL3JCQUNGRk1NWXZ6RDdlLXZBQUFCd1dCaUNEWTc3NS5wbmciPuOAgjwvZGl2Pg==
本课配套习题挑战模式2/5
单选题
难度系数:
2.如图所示,物体C重100N,在不计摩擦和绳重的情况下,要匀速提升重物时,需要加F为28N,若滑轮的规格都相同,则每个滑轮的重为()
A: 5N |
B: 10N |
C: 4N |
D: 20N |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOWvueeJqeS9k0Plkozliqjmu5Hova7mlbTkvZPlgZrlj5flipvliIbmnpDjgII=
- 提示2:IOWIhuaekOWQjuaIkeS7rOefpemBk++8jOaLieesrOS4gOS4quWKqOa7kei9rue7s+WtkOeahOaLieWKm+aYrzEvMihHPHN1Yj5EPC9zdWI+K0c8c3ViPkM8L3N1Yj4p77yM5YaN5a+55Lit6Ze05ruR6L2u5Y+X5Yqb5YiG5p6Q44CC
- 提示3:IOS4remXtOa7kei9ruWPl+WIsOWQkeS4i+eahOaLieWKmzEvMihHPHN1Yj5EPC9zdWI+K0c8c3ViPkM8L3N1Yj4pKyBHPHN1Yj5EPC9zdWI+77yM5ZCR5LiK55qE5ouJ5Yqb5pivMkbjgII=
- 答案:Qw==
PGRpdj7mi4nnrKzkuIDkuKrliqjmu5Hova7nu7PlrZDnmoTmi4nlipvmmK8xLzIoRzxzdWI+RDwvc3ViPitHPHN1Yj5DPC9zdWI+Ke+8jOetieS6juWQkeS4iueahOaLieWKmzJG77yM5omA5LulMS8yKEc8c3ViPkQ8L3N1Yj4rRzxzdWI+Qzwvc3ViPikrIEc8c3ViPkQ8L3N1Yj49MkbvvIzku6PlhaXmlbDlgLzvvIzmsYLop6PjgII8L2Rpdj4=
本课配套习题挑战模式3/5
单选题
难度系数:
3.如图所示,每个滑轮重10N,F=10N,不计绳重和摩擦,则物体G的大小为( )
A: 10N |
B: 20N |
C: 15N |
D: 30N |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWvueacgOS4iumdoueahOa7kei9ruWPl+WKm+WIhuaekOOAguWQkeS4iuaLieWKmzJG77yM5ZCR5LiL57uz5a2Q5ouJ5Yqb5ZKM5ruR6L2u6YeN5Yqb44CC
- 提示2:IOaxgueahOe7s+WtkOaLieWKm+aYrzJGLUc8c3ViPkQ8L3N1Yj49MTBO77yM5q2k57uz5a2Q5ouJ552A5LiL6Z2i55qE54mp5L2T5ZKM5Yqo5ruR6L2u44CC
- 提示3:IOeJqeS9k+WSjOa7kei9ruWPl+WIsOmHjeWKm+WSjOWQkeS4iueahOaLieWKmzIwTg==
- 答案:QQ==
PGRpdj7lt7Lnn6Xmr4/kuKrmu5Hova7ph40xME7vvIxGPTEwTu+8jOaVheS9nOeUqOWcqOS4i+mdouWKqOa7kei9ruS4iueahOe7s+WtkOeahOaLieWKm+aYrzLDlzEwTi0xME49MTBO77yM5YiZ54mp5L2T55qE6YeN5Yqb77yaRz0yw5cxME4tMTBOPTEwTi4gPC9kaXY+
本课配套习题挑战模式4/5
单选题
难度系数:
4.用如图所示滑轮组拉起G=100N的重物,不计轮与轴的摩擦和滑轮的重力,拉力F为( )
A: 25N |
B: 12.5N |
C: 100N |
D: 50N |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWFiOWvueacgOS4i+mdoua7kei9ruWPl+WKm+WIhuaekO+8jOaxguWHuuesrOS4gOS4quaLieWKm+OAgg==
- 提示2:IOWIhuaekOS4remXtOa7kei9ruWPl+WKm++8jOaxguWHuuesrOS6jOS4quaLieWKm+OAgg==
- 提示3:IOWIhuaekOacgOS4iumdoua7kei9ruWPl+WKm++8jOaxguWHuuaLieWKm0Y=
- 答案:Qg==
PGRpdj7kuI3ogIPomZHmu5Hova7ph43vvIznu7Pph43lkozmkanmk6bvvIzmiYDku6Xmr4/kuKrliqjmu5Hova7nnIExLzLnmoTlipvvvIznrKzkuIDkuKrmu5Hova7nu7PlrZDmi4nlipvlj5jkuLrljp/mnaXkuIDoiKw1ME7vvIzpgJrov4fnrKzkuozkuKrmu5Hova7lj4jnnIHkuIDljYrnmoTlipvvvIzmi4nlipvmmK8yNU7vvIzpgJrov4fnrKzkuInkuKrmu5Hova7lj5jkuLoxMi41TuOAgjwvZGl2Pg==
本课配套习题挑战模式5/5
单选题
难度系数:
5.如图是胖子和瘦子两人用滑轮组锻炼身体的简易装置(不考虑轮重和摩擦). 使用时:
(1)瘦子固定不动,胖子用力FA拉绳使货物G匀速上升.
(2)胖子固定不动,瘦子用力FB拉绳使货物G匀速上升.
下列说法中正确的是( )
(1)瘦子固定不动,胖子用力FA拉绳使货物G匀速上升.
(2)胖子固定不动,瘦子用力FB拉绳使货物G匀速上升.
下列说法中正确的是( )
A: FA<G |
B: FB<G |
C: FA=2G |
D: FB=2G |
一次做对,真牛!
+5奖励规则>
- 提示1:IOeYpuWtkOebtOaOpemAmui/h+e7s+WtkOaLieeJqeS9k0fvvIzkuIDmoLnnu7PlrZDmi4nlipvnm7jlkIzjgII=
- 提示2:IOiDluWtkOmAmui/h+Wumua7kei9ruaLieWKqOS4i+mdouWKqOa7kei9ru+8jOWPr+S7peWvueWKqOa7kei9ruWPl+WKm+WIhuaekO+8jOWPl+WIsOS4pOS4quWQkeS4i+eahOaLieWKm++8jOS4gOS4quWQkeS4iueahOaLieWKm+OAgg==
- 提示3:IOWcqOi/memHjOS4jeiAg+iZkei9rumHjeWSjOaRqeaTpuOAgg==
- 答案:Qw==
PGRpdj7nmKblrZDpgJrov4fmu5Hova7mi4nniankvZPvvIzlho3kuIDmoLnnu7PlrZDkuIrmi4nliptGPHN1Yj5BPC9zdWI+PUfvvIzog5blrZDnlKhGPHN1Yj5CPC9zdWI+55qE5ouJ5Yqb5ZCR5LiK5ouJ5ruR6L2u77yM5ruR6L2u5Y+X5Yiw5ZCR5LiL55qE5ouJ5Yqb5pivMkfvvIzmiYDku6VGPHN1Yj5CPC9zdWI+PTJH77yMPC9kaXY+