来自孙鲁毅的问题
物理的几个英文定律和题目求翻译定律1.thedirectionofvelocityincurvilinearmotionischangingwithtimeandthedirectionofthevelocityofaparticleatacertainpoint(orinstsnt)isinthetangentdirectionofthecurveatthat
物理的几个英文定律和题目求翻译
定律1.thedirectionofvelocityincurvilinearmotionischangingwithtimeandthedirectionofthevelocityofaparticleatacertainpoint(orinstsnt)isinthetangentdirectionofthecurveatthatpoint.
2.whenthedirectionofthenetforceabodyexperiencesandthedirectionofthevelocityofthebodydonotfallinthesamestraightline,thebodyisincurvilinearmotion.
题目1.ifaboat'sspeedinthestillwateris5m/s,andthespeedofthewaterinariveris3m/s.howcanwecrosstheriverintheshortesttime?andhowabouttheshortestdistance?
