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PHYS 122 test 2 Fall 2007 solutions

# PHYS 122 test 2 Fall 2007 solutions - I In a collision...

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Unformatted text preview: I . In a collision between a huge SUV and a small compact car, the SUV exerts a larger force on the compact car than the compact exerts on the SUV. a. True b. False C) Nemm‘s 3‘" La Us 2. Bill and Susan are both standing on identical skateboards (with really good ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan’s back, causing Susan to start moving away from Bill. Immediately after Bill stops pushing, a. SusanandBillai-emovingaway ﬁ'omeachother, and Susan’s speedis three times that of Bill. b. Susan is moving away from Bill and Bill is stationary. Susan and Bill are moving away from each other, with equal speeds. Susan and Bill are moving away ﬁ'om each other, and Susan’s speed is three times less than that of Bill. 9-.“ _.— Fgmg # Fsmblll {lchﬂz J {Tia 3. When the ball reaches the break in the circle, which path will it follow? ©©@© MW‘g 15l- 9 moms 'l‘al’l C’rl’l h . 4. A car drives over the top ofa bill that has a radius of40 Hi. What maximum speed can the car have without ﬂying off the road at the top of the bill? a. 24 m/s b. 20 m/s 6. 16 m/s (:1. 12 m/s 5. A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.151033; aimed 4.0 m up, 3.0 m away What is the velocity of launch of the boulders? SMQ: /5 owl“ my?) JHBM‘l I Jl o O X=E+UG¢E+%§:{? VPZVC Jr‘th 156m: W999 JC 0: vsmcg “IOJC [56:V(%>JC Vwﬂzlot a”) 8030 "ﬁlm 6) V (V ( (ll/5633 7' 950 v1 : 266 ° \$77?— f; 325 V; 3&5 lama m/s 6. The ﬁgure shows a 100 kg block being released from rest from a height of 1.0 In. It then takes 1.0 s to reach the ﬂoor. What is the mass ofthe block on the leﬁ‘? Use g = 10.0 mfsz. :i W” T I x Iiix J A L"3m @100 Q 4M1 ‘j O f? a; Zm/SZ Ta—m33mo. wuss g, *7 :‘UOijJ 0‘ 7: mm: 2m roo(103~"f’: “30(2) ﬁrm D/ Tim 7. A 2000 kg truck is traveling east thro an ' tersection at 2.0 m/s when it is hit simultaneously from the side and the an; e car is a 1000 kg compact traveling north at 5.0 m/s. The other is a 3000 kg Excursion traveling west at 10 m/s. The three vehicles become entangled and slide as one body. 3. Write down the conservation of momentum equation along the x-axis. . \/ 2W3 “BM;5 // ﬂ: 8* I}. Write down the conservation of momentum equation along the y-axis. 1000 his ( Smb) = (QCGO 1463 Vsin®> SOOC) __ (0000 — c- What two quantities can you solve for in this problem? v18 8. A 20.0 kg child must exert a 400.0 N radial force in order to remain on her mount on the outer edge of a merry-go—round. a. What acceleration does the child experience (magnitude and direction)? '3': ma 400M : QOFSOL a: 20 M/SZ b. Assuming that the child is moving at 8.00 mfs, what is the diameter of the merry-go—round? Clo;)j_2: r; V3 (gm/5F 65‘ mz/SZ : 5.2m QC, * 520mb; gem/52 ...
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PHYS 122 test 2 Fall 2007 solutions - I In a collision...

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