2- a car pitches down in front when the brakes are applied sharply. explain this observation in terms of torques.8- give an example of a system in which the net force is zero but the net torque is nonzero. veaqualitativedescriptionofthelocationofthecenterofmassoftheglassanditscontentsastheglassisslowlyfilledwithwater.16- what purpose does the tail rotor on a helicopter serve?22-youhavetwoeggs, determinewhichiswhick,youspintheeggsonthekitchencounter.whicheggspinsfaster?explain.18-apuckonahorizontal,frictio thepuckrotatesaboutthehole,thestringispulleddownward,bringingthepuckclosetothehole,duringthisprocess,whathappenstothepuck'slinearspeed?itsangularspeed?itsangularmomentum?
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题目基本都不太容易，而且，量又这么大。希望以后出题 为答题人着想着想。完成你这个问题，需要花的时间太多了。强烈建议 把各题目分开出。比如 你这些题目 可分成 6 个问题 来提出。这样大家回答的时候 可以选择自己会的答，每个问题也不要太多时间了，回答的人也多了。