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Unformatted text preview: PH 131 FALL 2005 HOMEWORK # 1 Assigned: 08/29/05 50 SHHTS 11 I41 100 SHSETS
21144 200 SHilTS 22141 6 CHI—'7 ? Antarctica is_ roughly semicir
cular. with a radius of 2000 km (Fig. 15). The average thickness
of its ice cover is 30(1)I m. How
many cubic centimeters of ice
does Antarctica contain? {lgnone
the curvatun: of Earth.) ssm _. .1. arr2»
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22144 200 SHEETS 22141 . 0 CHI )0 10 Physicist Enrico Fenni ome pointed out that a standard lecture
period (50 min) is close to 1 microoenlury. (a) How long is a mi
crocentury in minutes? (b) Using percentage difference = ﬁnd the percentage difference from Fermi’s appmxinmion.‘  .4, room £3; a (scam
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23 ' Iron has a mass of 7.87 g per cubic centimeter of voleme, GWEN; I. P = 7' 87 K {O “‘3
andﬂlcmassofanimnatomis9.27x lﬂ‘z‘ngflhealomsm M 3' 9.27,!{0‘2‘
spherical and tightly packed. (a) what is the volume of an iron kj atom and (b) what is the distance bemeen the centers of adjacent
atoms? m M M55
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50 V
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60 kmfh. (a) What is the average velocity of the car during this I3 6} e M 3‘7, '
‘80 km trip? (Assume that it moves in the positive x direction.) —_ AX
(b) What is the average speed? (c) Graph 1 versus r and indicate V : —
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m CHZ “£2 E Ham [ahlllfapanicle’spositionis given byx = 4 — 12: + 3:2 (where tisinseooodsandxis in meters). what is its velocityat r =15? (b) Is it moving in the positive or negative direction of x just then? (c) What is its speed just ﬂten? (d) Is the speed larger or smaller at  later times? (Tly answering the next two questions without further mlculation.) (e) Is there ever an instant when the velocity is zero? » (0 Is there a time after: = 3 s when the particle is moving in the
negative dinection of .r? 774/5 I'MSTMTArdEooﬁ vac—oars) rs. Gall/EM 37’ : 5:: AT" T=I§Z sum—E V(T=)s 40/ 32715 MDWMG
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posiﬁuxdirccﬁmandl4slateritsspeedwas30misinthe
opposite direction. What is the average acceleration of the
particleduring thi32.4simerva!? 55M C“ V6) (9., runs oat/5 (+229)
7’ '= ”5" “”5 C+ =21”) z: z “W .._C")
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at . An elecuun has a chasm acoeleratim of +3.2 mfsz. At GWEN 6" = 3'2 S‘
a mum instant its velocity is +9.6 mls. What is its velocit = . 2“—
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and (c) the instantaneous acceleration of the proton at t = 3.0 s. U?) L? C30 5) (d) Graph 1 versus r and indicate how the answer to (a) can be c _ )bt
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ground. Suddenly, the plane mcomncrs terrain that slopes gently e  L! .3
upwatd at 4.3“. an amount difﬁcult to detect visyally (Fig. 2l6). ' __ .5 OD
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 Fall '08
 wick
 Physics

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