问题标题：
求物理帝解答!给个得数!A54-kgcrateisplacedonaninclinedramp.Whentheangletherampmakeswiththehorizontalisincreasedto25.0°thecratebeginstoslidedownward.(a)Whatisthecoefficientofstaticfrictionbetweenthecrate
问题描述：
求物理帝解答!给个得数!
A54-kgcrateisplacedonaninclinedramp.Whentheangletherampmakeswiththehorizontalisincreasedto25.0°thecratebeginstoslidedownward.
(a)Whatisthecoefficientofstaticfrictionbetweenthecrateandtheramp?
(b)Atwhatangledoesthecratebegintoslideifitsmassisdoubled?
刘保政回答：
1)μ＝tan(25°)=0.4663
2)25°不变
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