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testf2005-2101

# testf2005-2101 - Question 1(8 points Figure showsa...

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Question 1 (8 points) Figure shows a three-pa,rticlesystem, with masses ml, m2, o,\d ms. (7) If m2 is graduatly decreased, does the center of mass of the system (circle the right answer) mg a a*' (2) If the only forces acting in the system a.re internal, the net force acting.on the center of mass of the system is (b) Can not be deternined from the information given. ml (a) shlft towards rn2, (c) remain statibnary.

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*ttu-.-&,/ +6l.*r"^ Problem L (LZ points) A rocket is fired vertically upward with an initial speed of. s00 mls. when it reaches an altitude of 1000 rn, and its speed has slowed to 480 mf s, it explodes producing three equal- mass ftagments. Just a,fter the explosion, one fragment continues to move upward with a speed of 450 m/s. The second fragment has a speed of 240 ml s and is moving east right a"fter the explosion. (1) What is the velocity of the third ftagment just after the explosion? ?. -P. 'd - "- \$,2+oe *M ,t4" 3 s 3 + M 3 (2) what is the maximum a.ltitude(ftom the ground) the center of mass of the system will reach? i " Q M o - - t-J) i4.Qg6 - O + 4so5 * g o ' * T 41 3 * t= 77o yg tL Ce*/et, 4 /r.,4r4 aonl'rr^'"a 4o t*<, ^ d ed 4f; 4 A* 'A%c "'to. 45=o, & - - X fV1: -E+ * SooV - + \$ = o 4 + '?r4r * V e . - * + " * % ? f * o L /r^,= -; 6,.fn 'eoos.' Jxx v-lss.tn* rtcp-- y, E r ' 9; 3
Question 2 (8 points) A block slides across a frictionless floor and then collides with a second block that was initially stationa.ry. The figure shows four possible graphs for the kinetic energies of the

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