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從公式去看，G是定值不用動
r變4倍所以分母變4^2倍
體積正比於r^3所以M m都變4^3倍所以要乘兩次4^3
所以引力變乘4^3*4^3/4^2=4^4=256倍
Physics
Senior High
Resolved
每次這種題目都會搞混 怎麼解啊😢
每題有5個選項,答錯n個選項得該題 10-4n分,低於零分以零分計)
( B ) 1. 兩個大小相同的實心鐵球緊靠在一起時,兩個鐵球之間的萬有引力為F。若取兩個相同材
質、半徑為原來4倍的鐵球緊靠在一起時,則彼此間的萬有引力為何?
FF
(A) 256F (B)64FCF (D)
64 256
Gmm:
F=
2
p
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