Apparent weight會在升降機加速或減速時有變化,,
那麼這些變化的多少會
1. 因為升降機的大小改變嗎? (e.g.升降機越大,,變化越大?)
2. 因為機內乘客的人數而改變嗎?(e.g.人數越多,,變化越少?)
如有,,為甚麼?
可能差別只是很少,,只是想知道理論上有沒有改變
請幫忙解答,,謝了
Apparent weight會因升降機大小和乘客人數改變?
2009-08-16 12:01 am
回答 (2)
2009-08-16 8:16 am
✔ 最佳答案
W=mg(+/-)ma(何時正,何時負就看加速度向上還是下,而且是加速還是減速)
只要a不變
那視重無論在1或2情況下都是
一樣的
(但若是給同樣的力
那升降機大小,人數多少都會改變
因為F=ma
若m細左/大左
F不變
那a就會增加/減少
令視重產生改變)
參考: 我
2009-08-16 12:53 am
The apparent weight R of an individual, of mass m, inside a lift under an accelerating a is given by:
R = m(g +/- a)
Just from the physics point of view, if all the factors in the above equation are kept constant, i.e. m, g and a are unchanged, the value of the apparent weight R would not be altered.
However, the scenario may be different in the real situations. Any change in lift capacity or lift loading would affect the acceleration of the lift, assuming the power that drives the lift remains the same as before. Thus, any change of lift acceleration certainly affects the apparent weight of individual passengers inside the lift.
R = m(g +/- a)
Just from the physics point of view, if all the factors in the above equation are kept constant, i.e. m, g and a are unchanged, the value of the apparent weight R would not be altered.
However, the scenario may be different in the real situations. Any change in lift capacity or lift loading would affect the acceleration of the lift, assuming the power that drives the lift remains the same as before. Thus, any change of lift acceleration certainly affects the apparent weight of individual passengers inside the lift.
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