Practice Final Exam with Solution - Principles of Physics I | PHYS 2211, Exams of Physics

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O c— > (6 points) What is the speed and direction of the bullet when it lands? 5 Va 2 TO m/s Vy O+ gat Ve> Jur TV, e Name Ke: Date 7 { Practice Final Exam—Spring 2007 Principles of Physics I Show all work! 1) (10 points) For each of the following physical quantities, state whether each is a vector or a scalar: time. exe: J l ar acceleration. AAA b ¥ torque Ve eto Cc momentum vee for potential energy $ CH l. ar moment of inertia. sca i ar work_$ 0 @ l ar wavelength ofa ds aur angular acceleration__V@C tor mass SCA lar 2) (4 points) A popgun fires a rubber suction cup with a mass of 0.0030 kg, horizontally with a velocity of 7.5 m/s from a height of 1.00 m. A) How far from the end of the gun “pe yt hay at? Kevq A t ) ~lm2 SCs) 4? > TS (457 &> #528 * 3am yoo Gash +E = BT “t O 466459) 2 2 443m Otay A) ~ 30.6" C) @ points) How does the momentum when the bullet hits the ground compare with the momentum initially? Does this violate conservation of momentum? Why or why not? 7 pif m Vi = (o03(75)t = 0295 kg m/s 7 Pe : m (%)= ,003(7.5 4 g*-1.43p) 2 ,020dT “ 01344) ka m/s Momentum has changed magni te 2 and direction. This does NOT violate conserva tion of momentum, since gravty iSanexternal Pree, 3) (3 points) A cannon is backed up against a tree so that it cannot recoil. How does that affect the speed of a cannonball fired from the cannon? Explain. (Hint: Consider conservation of energy.) . 2 For energy to be aonsene d, °F Yke cannes cannot recor’, wore Kinetic energ-y foes in to Yhe cannon ball, 50 4 wi I have a lager ini tial veloerty