请你看这道关于万有引力的题:
If the distance between two masses is increased by a factor of 5, the gravitational force of attraction between them will
a. increase by a factor of 5
b. remain Same
c. reduce by a factor of 25
d. reduce by a factor of 5
重点:两物体间距离增加5倍,问万有引力如何变
根据 G正比于 m1*m2/r^2
所以选c
减少为原来的25分之一
看见,英文by a factor of ...既可以说增加,也可以说减宽芹少。相当汉语说:是原来的。。倍,但是汉语很派粗少说:增加到原来的1/6倍。
所以 你尘巧镇的问题reduce by a factor of 3 to 4意思是你后面的答案:减少到1/3到¼
提醒你注意区别:3 to 4 和 3 over 4
3 to 4 :3和4 之间
3over4 : 3/4
以3比4分之一降低
减少4分之3
减少在4/3