An astronaut lands on the moon and finds that his weight is one-sixth of that on earth.Which fo the following deductions is/are correct?
(1) ...
(2)...
(3) The maximum weight he can lift on the moon is greater than on earth
點解第三句是對?
但係我本書from physics in life
又話"A object will have a smaller weight on moon than on earth,but the mass will remain the same"
呢度又話maximum weight he can lift=same
maximum mass he can lift=increase
咁咪有予盾?mass唔係fix,weight variable in diff place咩?
weight,mass
2007-04-06 10:09 pm
回答 (5)
2007-04-07 12:40 am
✔ 最佳答案
[The maximum weight he can lift on the moon is greater than on earth]Pay attention to the words: he can lift
To make the answer simple. The max weight he can lift is just equal to the max. effort (or force) he can give. This is independent of whether the man is on earth or on the moon.
2007-04-08 6:49 am
weight = mg
weight係force黎, 例如太空人最多可以拎500N既野
起月球同地球佢都係最多可以拎500N既野, 月球既重力細, 所以例子: 太空人起地球只可以拎起一個人,起月球就可以拎起一架車, 雖然mass唔一樣, 但由於重力差別, weight都一樣
weight係force黎, 例如太空人最多可以拎500N既野
起月球同地球佢都係最多可以拎500N既野, 月球既重力細, 所以例子: 太空人起地球只可以拎起一個人,起月球就可以拎起一架車, 雖然mass唔一樣, 但由於重力差別, weight都一樣
參考: myself
2007-04-06 11:08 pm
其實mass係fix, weight is variable.
F=mg
F = force = weight
由於月球的g 與地球的g 不同,如太空人在地球能舉起50kg,在月球可舉起300kg
在地球
F(earth) = mg = 50(10) = 500N
在月球
F(moon) = 50[(1/6)10] = 83N
F(earth) / F(moon) = 500 / 83 = 6倍
F=mg
F = force = weight
由於月球的g 與地球的g 不同,如太空人在地球能舉起50kg,在月球可舉起300kg
在地球
F(earth) = mg = 50(10) = 500N
在月球
F(moon) = 50[(1/6)10] = 83N
F(earth) / F(moon) = 500 / 83 = 6倍
2007-04-06 11:01 pm
mass係不變
月球既gravity係地球既1/6
咁weight就低左..
吸力細左..自然可以跳高d
..同埋..你個本野講果句係岩既
maximum weight he can lift=same
maximum mass he can lift=increase<---黎兩句就唔係好知你講咩
月球既gravity係地球既1/6
咁weight就低左..
吸力細左..自然可以跳高d
..同埋..你個本野講果句係岩既
maximum weight he can lift=same
maximum mass he can lift=increase<---黎兩句就唔係好知你講咩
2007-04-06 10:58 pm
冇錯...mass係fix左,weight係variable under different gravity acceleration.
但第3句佢冇提到mass喎-.-" ,
佢只係話 "最大的重量"
Given that the weight on moon is one-sixth of that on earth.
等我舉個example...
有一個西瓜係地球重30N,咁個西瓜係moon的weight 咪5N囉....
如果astronaut係地球最多承受到的weight係600N,照計佢係moon承受到ge只有100N,所以如果比係地球重3600N的object佢拎,咁佢係moon承受到的weight只係600N.
因為3600>600,
所以The maximum weight he can lift on the moon is greater than on earth.
第3句係岩ge
希望你明啦
但第3句佢冇提到mass喎-.-" ,
佢只係話 "最大的重量"
Given that the weight on moon is one-sixth of that on earth.
等我舉個example...
有一個西瓜係地球重30N,咁個西瓜係moon的weight 咪5N囉....
如果astronaut係地球最多承受到的weight係600N,照計佢係moon承受到ge只有100N,所以如果比係地球重3600N的object佢拎,咁佢係moon承受到的weight只係600N.
因為3600>600,
所以The maximum weight he can lift on the moon is greater than on earth.
第3句係岩ge
希望你明啦
參考: my physical knowledge
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