Science
Junior High
่ณๆฅใงใ๐ฃ ๅงๅใฎๅ้กใง3ๅใ ใๆใใฆใใ ใใ(>_<;)
2
โขๅณ1ใฎๆบใฎ4ๆฌใฎ่ใซใฏ,ๆบใฎ้ใใๅ็ญใซใ ๅณ1
ใใใใฎใจใใฆ,ๆฌกใฎๅใใซ็ญใใชใใใ
โก(1) ๆบใฎ่ใๆฅใใฆใใ้จๅใฎๅบใๅใใๅงๅใฏ
ไฝPa ใงใใใ
โก (2) ๅบใซใใใๅงๅใ5ๅใฎ1ใซใใใซใฏ,่ใฎ
ไธใซไธ่พบใไฝcmใฎๆญฃๆนๅฝขใฎๆฟใใใใพใใใ ใ
ใ ใ,ๆญฃๆนๅฝขใฎๆฟใฎ้ๅใฏ่ใใชใใใฎใจใใพใใ
โก(3) ๅณ2ใฎใใใซ, ๆบใ40N ใฎ้ๅใใฏใใใๆฟ
ใฎไธใซใฎใใพใใใ ใใฎๆฟใๆฅใใฆใใ้จๅใฎ
ๅบ้ขใๅใใๅงๅใฏไฝPa ใงใใใ
ๅณ2
ๆบใซใฏใใใ
้ๅ200N
ๅบ้ข็ฉ
20cmยฒ
200 N
40N
2m
1.5m
13
(1)
(2)
(3)
Pa
cm
Pa
ๅ/็็ง2ๅนด 57
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