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# HW5 - Oregon State University Physics 201 Fall Fall Term...

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Oregon State University Physics 201 , Fall 2009 HW5 W (due Nov. 2 at 5:00 p.m.) Page 1 Oregon State University Physics 201 Fall Term, l 2009 HW5 This HW assignment, due November 2, covers topics in Chapter o 9 of the text—freely mixed together (and r youʼll need the basics of projectile motion, too). Donʼt forget the extra credit point available. Follow the recommended format for solutions, with SI units unless directed otherwise and 3 significant digits in all numerical answers. Use a separate page for each solution—donʼt crowd your solutions on a page. Assume that the magnitude of local gravitational acceleration, g, is 9.80 m/s 2 . 1. A 250-kg projectile is fired from the ground with a speed of 120 m/s at a 60.0° angle above the hori- zontal. At the highest point of its arc, it explodes into three pieces, A, B and C, all of equal mass. Immediately after the explosion, pieces A and B are still moving with the same speed as the whole projectile had right before the explosion. However, A is moving vertically downward, and B is mov- ing horizontally forward (i.e. in the same direction as the projectile prior to its explosion). Find the velocity of C right after the explosion. 2. Two pucks collide on a level air-hockey table. Puck A has a mass of 0.0250 kg and is moving ini- tially due eastward at a speed of 5.50 m/s. Puck B has a mass of 0.0500 kg and is initially at rest. f Right after the collision, puck A is moving in a direction 65.0° north of east; and puck B is moving in a direction 37° south of east. Find the speed of each puck right after the collision.

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