quiz2v1sol - Ph 111 September 19, 2008 NAME _RWB_ Class...

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Ph 111 NAME ________RWB ______________________ September 19, 2008 Class Average: 5/10 Quiz 2 Solutions Problem 1. A cannonball is fired out of a cannon on level ground, as shown. Its initial horizontal and vertical velocities are v 0x = 40 m/s and v 0y = 30 m/s, respectively. Please take g = 10.0 m/s 2 , and give the units as part of your numerical answers. Give numerical answers to at least three significant figures. (a) What is the value of v 0 , the initial speed of the cannonball? Use the Pythagorean theorem: () 22 00 0 40 m/s 30 m/s 2500 m / s 50 m/s xy vv v =+ = + == v 0 = 50 m/s x y 0 v G v 0x v 0y (b) What is the value of the initial angle of the path of the cannonball, above the horizontal? 0 0 30 m/s tan .75 40 m/s 36.87 y x v v θ = →= ° (c) How long will it take the cannonball to reach the highest point of its trajectory? θ = 36.87 ° Use with v 0 yy g =− t y = 0: 0 2 30 m/s 3.000 sec 10.0 m/s y v t g = Problem 2. Now suppose that the initial speed of the cannonball is unchanged, but the initial angle is increased so that the velocity components are reversed: v 0x = 30 m/s and v 0y = 40 m/s. Indicate with a check mark which of the following quantities will be greater, the same, or less, than in Problem 1 above.
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This note was uploaded on 05/13/2010 for the course PHYSICS 111 taught by Professor Staff during the Fall '08 term at S.F. State.

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quiz2v1sol - Ph 111 September 19, 2008 NAME _RWB_ Class...

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