phys2a quiz7

# phys2a quiz7 - A: 14 '04 see the tear-off portion of the...

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Unformatted text preview: A: 14 '04 see the tear-off portion of the page for quiz version (A,B,C, or D). Please mark this version letter on your scantron __You must return the tear-off portion with the scantron form, but you can take the questionaire home. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the center of mass of anindividual slice of a 23.0—in diameter pizza, if the pizza is cut into 6 equal ‘ slices. Q15 UPON INSPGC'ROM or bmamn A) 14.6 in from the tip along the bisector of the angle B) 3.50 in from the tip along the bisector of the angle C) —3.50 in from the tip along the bisector of the angle D) 7.31 in from the tip along the bisector of the angle 2) A container explodes and breaks into three fragments that ﬂy off 120° apart from each other, with mass ratios 1:5:4. if the ﬁrst piece ﬂies off with a speed of 10.1 m/s, what is the speed of the other two fragments? (Allfragments areinthe plane.) trqm I I (M Y m 5‘“ .. MN‘ ._ Wilex +yv\%\l3x<’\'©# '5 WNW " 12" "“ :5 . lUlM/EV‘ -— (5 v1+ avg-5m so . WMV‘ ; m;V;(f5!VI3O°)+M\$x )e—i was . g WAN/52m éegvl JrHVB) £0530 =C A)2and1m/s ’V3(‘T"“g1an§25m/s C)2and2.5m/‘s ‘ - .1 and2.5m/s .— , - \$ 2 . — . it v ‘ 3) An ob] ct irritiallggat rest explodes in two fragments of masses 2.0 kg and-34.6 kg tha mo - - ‘ ally opposite directions. If the speed of the first fragment is 1.0 m/ 3', ﬁnd the intemal energy released in e .1 \J ‘ explosion.' : LL‘LVL) :7 V7. 9-: :M/s I 7- MI - ' ' ' l; és E: ~51<MNPWMLVJ>9 3i(2+ I» M 150’ A) 3.31;] l B) 1.4] ' C) 3.3] ' ' D) 1.414 4) A 0.24—kg blob of clay is thrown at a wall with an initial velocityof 20 m/ s. If the clay comes to a stop in , 91' ms, what is the average force experienced by the clay? - go "5 = .05“ s ' . _ I Crews SFWG‘ 5~a°5 = 13? ‘V‘LL‘MlOM/s) on“? ' p I Elmo, = A)45N B)53N I C)33N D)64N A—l , I - ' tear off this section and retum Code number V car heading north collides at an intersection with a truck heading east. If they lock together. and travel at_ ‘ i m/ s at 38° north of east just after the collision, how fast was the car initially traveling? assume that the tWo vehicles have the same mass. 29) ~ 0 MT V1- : 1' MC) - W vuan 2 (MT Hm vgsmB‘l" \F Mr‘Mc : Vc. = 10% W5) SW53" .5 54 r‘l'l-Y'Mg B) 17 m/s C) 68 rri/s D) 34 m/s \‘ 6) A child throws a tennis ball at 12 m/ s directly at the front of a school bus which is moving at 29 m/ 3 towards If the collision is elastic, find the speed with which the ball bounces from the bus. CW5 P ‘ m' V}. * HV; = WW3, ‘r MV; APPM WWW? ‘ 5 a I a“ 5.4. z+iMW?=tww+sWWP C”““%‘>mt+ aMVL 3%" Vb : V5}. A) 70m/s. B) 46m/s C) 41 m/s . D) 53m/s ‘ V5: 2(2‘1)? . 'O 7) A rocket ejects 105 kilograms of fuel in the 90 seconds after launch. The exhaust speed is Uex = 2 km/ s. I )1? TIL What is the maximum possible initial mass (including fuel) of the rocket if it is to lift off the ground? ‘I B) 2.3x105 kg at A) 3.4x105 kg 3 _ D) 1.5x105 kg i . C) the rocket cannot lift off __ 3 ' _ L oln 0N K %’*E*Mn .=> Va (1493;1—y>mrkoab :> mg 22s,?5‘tk»), * ...
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## This note was uploaded on 10/18/2008 for the course PHYS 2A taught by Professor Hicks during the Spring '07 term at UCSD.

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phys2a quiz7 - A: 14 '04 see the tear-off portion of the...

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