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homework sets0001

homework sets0001 - .l ASTR 1010(Dr Homswin ~~ Written...

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Unformatted text preview: .l\ ASTR 1010 (Dr. Homswin) ~~ Written Homework Set 2 '-, Due at the BegiDDi~g ~f Class: WedIlesdaY, Oct 1 NAME: • Youmay study with your friends but.theworkyoU hand in should be your own. The main purpose of the homework is for you to leamthe material - on which you will be tested later.You cannot learn by others doing the work for yon. IdeJlticalassignments will receivesplit creait. • A single number or word on its own is not an answer. You must show HOW you cameto your answer an4 give the units of quantities. • If you have other sheets (or rinted thisQUt. PLE.ASE STAPLE!! 1- Motion and ravity (a) A parachutist is falling.toward the gr0wnd. lbe downward force of gravity is exactly equal to the upward force of air resistance. Desc•••• how/if.the velocity of the parachutist changes- and exp~~t:~\ fC\n'titl ~ :?&1\C \ r ~ &\,vt: (b) Equal and opposite forces: Accordin3tQtb.e universal law of gravitation, the force of the Earth pulling on the Moon is exactly the'~M ~force of the Moon pulling on the Earth. Explain why it has a much larger effect ol).tIJe~OO(lthan on the Earth. (For example, tides on Earth are a few meters high, but if the Moo. had water, it would have tides that are kilQmeters _ hiS\~ec we ~r1 1 5 rY'D.\$~h~~ \~If) 1tifvn the ba:ft13 ,"YltlB~ I~' .~: t: ~= ~~~~~~~~~e:~L, 3-\j~~ Dl~~~~e:'IIO~ state!';~~e~r f~se- and explain your reasoning. , (a) While on a space walk outside the ~,Station.an~naut drops the tool she is working .With and it quiC~t floats a~! ,fromher.,..•.••..• ..". . . ......\t.A ~ \~1~~~~ ~~~~~~(OW~~) IYl c ! '-"'1"'''''''- _" " . '.' l (b) If we could somehow replace the Sun With a Styrofoam ball that has precisely the same mass, ~fr:;;~:;b~d~,~ txYwee,\h~ ....• 83u(-\-}1~'•.•. ,;b ~. Tn:;./~. /tJ,t~6 CfU~ )~ \tvc ~ ... ~8lY\" . ....•........ , 4 - Aecelera • . . . . (a) Exj>lain why the ..•. WJitsofacceleratlOnai\l.'.·· •• ·.mW .•·.· ••. and.n.otjustmls. ",A Jl.lJflA\A;J. "/1I~f~Y1 M /5 : ~:3 ~ ~j 9C~J v · r u u t L / l ( / \ J ~ - y 1:i:!. _ W'\ t So - (Yl) t'" ~ ....- \ b t --S"'- ;) (b) If yOll dfo}Y a rock from a very tall buildifta,llowiif\$st will it be goi~ after 6 seconds? Explain. . ~ ". n ~ .... ,.~.· .....•. d!lf.!Ji.l~ Wrn/'5l11WJX ~ Gx l6- flflnjy CACCeb"~f()yff~,. (c) As you coast you.rbike down Folsom.hill Yo'Uacqe"rateat about 2 m1s 2 • How fast Willyou be moving after 4 seconds (assuming you starttd frolll..,\$tOp)? (Remember to show your units.) Exptv5?- ~ ~~(0)elC Y"YIo,Am~ ~cb ~~ ~- ~ . " (d) You are driving along the highway at a~~f1S'miles Per hour when you slam on the brakes. If your acceleration is at an averagcintte of .. t Smiles per hour per second, how long will it take to come to a stop? Show your work....
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homework sets0001 - .l ASTR 1010(Dr Homswin ~~ Written...

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