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有没有物理好英语又好的达人帮我看看这些题目?1.Ifthecoefficientofkineticfrictionbetweena28kgcrateandtheflooris0.25,whathorizontalforce(inN)isrequiredtomovethecrateataconstantspeedacrossthefloor?2.Ap
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更新时间:2024-03-29
问题描述:

有没有物理好英语又好的达人帮我看看这些题目?

1.Ifthecoefficientofkineticfrictionbetweena28kgcrateandtheflooris0.25,whathorizontalforce(inN)isrequiredtomovethecrateataconstantspeedacrossthefloor?

2.Apersonhasareasonablechanceofsurvivinganautomobilecrashifthedecelerationisnomorethan30"g's"(recallthatg=9.8m/s2).Calculatetheforce,inN,ona72kgpersonacceleratingatthisrate.

3.Anelevatoristravellingupwardsataconstantaccelerationof4.7m/s2.Ifa68kgpersonintheelevatorisstandingonabathroomscale,whatwouldtheymeasureastheirapparentweight(inN)?

4.Supposeacircularplatformisrotatingataconstantrateof17rev/min.Howfarawayfromthecentrewouldoneneedtostandinordertohaveanradialaccelerationof6.3m/s2?Expressyouranswerincm.

5.SupposetheCanadianSpaceAgencywishedtoplacea773kgsatelliteinacircularorbitaroundthemoonsuchthatthesatellitetakes17.4hoursforonecompleterevolutionaroundthemoon.Howfarawayfromthesurfaceofthemoon(inkm)wouldthesatellitebelocated?N.B.MassofMoon=7.35x1022kg,RadiusofMoon=1.74x103km.

顺便帮我看看这题好吗?

Howisthequantitycalled'impulse'calculated?

a.fromthechangeinmomentum?

b.fromthechangeinacceleration?

c.thechangeinthekineticenergy?

答案只需要准确数字,不需要单位,补充问题说一下选哪个就好

蔡绍皙回答:
  1.68.6N   2.21168N   3.986N   4.198CM   5.90km   好多年不看了都忘记了不保证结果正确
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