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Physics_8A_-_Summer_2002_-_Golightly_-_Midterm_1

Physics_8A_-_Summer_2002_-_Golightly_-_Midterm_1 - Physics...

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Unformatted text preview: Physics 8A Summer 2002 MIDTERM 1 Each problem is worth 10 points. 1. A ball is thrown from the ground into the air, reaching a maximum height of 115 m, and traveling a horizontal distance of 245 m before it hits the ground. Determine the speed and direction with which the ball was thrown, and the amount of time it was in the air. A car a a bus travel along two intersecting roads, as shown here. is traveling at 30 m/s due north, and the bus is traveling at 20 - 35° north of east. At t = 0, tim expressed in unit-vector notation. In the diagram, m] = 2.0 kg and m2 = 3.0 kg. A coefficient of kinetic friction M = 0.30 exists between both blocks and the surfaces. The pulley is massless and frictionless. Find the acceleration of the masses, and the tension in the rope. (a) A roller coaster car travels at 25.0 m/s at the bottom of a loop, where the radius of curvature is 65.0 m. An 85.0 kg man is in the car, and sitting on a scale. What does the scale read? (b) Suppose the car slows to 15.0 m/s at the top, and the scale now reads an amount equal to the man’s weight. What must be the radius of curvature of the track at the top? Pg‘thrJ JyA Mfflkrm l fo(k+*\3"-’ (. FI'Y,+ I.“ Ma. +3“. T-‘m 0% ch7 Jaw (6,1;(3, Ayn-“X {mu-x! v-vo=w7+-L‘*fi L37 4. r ~. 0 “WW/+4“ 4‘“: ”.3”! fu $4.! +5.“ += 2+4: 7.034 Now 4M Vox\ x~¢¢=w,+ Zwr :- vH (‘LHI Vex? l$3h¥f O 1 V.” ”67. HALF!) Voy " LIT"! f V: J have; = 5‘3! 7 w, V +5.” 6; 2 :1 :11’7 V07L 60: €I.7° a ”1.55"“ “MRMIJ’MHM1§c¢/26‘¢Mlq 4-le O (ml‘ma Ea -flkm’ ’Mkml(3130°)§ a: Put-M L : 81¢ m‘ 30"" («WWII») — (0.30\( 10) (or 2dr? 1”) M L.O +16 1 0.1% ”/I" T" m.“ ‘L/(kalj -. ”41(6‘ #flh’j) " (11M Lo-l" +~ (QWHQJU '. 6- LI N ...
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