230问答网 > 汽车更换轮胎时需要把车轴抬起来，这时可以使用“油压千斤顶”．下图是油压千斤顶的原理图．向下按动手柄

汽车更换轮胎时需要把车轴抬起来，这时可以使用“油压千斤顶”．下图是油压千斤顶的原理图．向下按动手柄

2025-03-16 17:09:34
推荐回答（1个）
回答1：


（1）如图，0A=OB+BA=6cm+54cm=60cm=0.6m，
OB=6cm=0.06m，
由杠杆平衡条件得：
F×OA=F小×OB
即：20N×0.6m=F小×0.06m，
∴F小=200N，
∵p大=p小
即：
F大
S大
=
F小
S小
，
mg
π(
1
2
D )2
=
F小
π(
1
2
d)2
，
则：
D2=
mg
F小
d2=
1000kg×9.8N/kg
200N
×（1cm）2
解得：D=7cm．
答：大活塞的直径至少是7cm．

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