题目内容
甲、乙两物体放在水平桌面上,甲的质量是乙的5倍,乙与桌面的接触面积是甲的4倍,则甲、乙两物体对桌面的压力之比为______,压强之比为______.若把甲置于乙上,则甲对乙的压强与乙对桌面的压强之比为______.
已知:m甲=5m乙,S乙=4S甲,
(1)甲、乙对桌面的压力之比:
=
=
=
=
;
对桌面的压强之比:
=
=
=
×
=
;
把甲置于乙上,甲对乙的压强与乙对桌面的压强之比:
=
=
=
=
.
(1)甲、乙对桌面的压力之比:
F甲 |
F乙 |
m甲g |
m乙g |
m甲 |
m乙 |
5m乙 |
m乙 |
5 |
1 |
对桌面的压强之比:
P甲 |
P乙 |
| ||
|
F甲S乙 |
F乙S甲 |
5 |
1 |
4 |
1 |
20 |
1 |
把甲置于乙上,甲对乙的压强与乙对桌面的压强之比:
P甲乙 |
P乙桌面 |
| ||
|
m甲S乙 |
(m甲+m乙)S甲 |
5m乙×4S甲 |
(5m乙+m乙)S甲 |
10 |
3 |
练习册系列答案
相关题目