SolutionsQuiz2&3

SolutionsQuiz2&3 - Algebraic Solution: Quiz #2 (15...

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Unformatted text preview: Algebraic Solution: Quiz #2 (15 minutes) Feb. 10, 2011 Physics 2101 Section 7 (odd) Name_________________________________________ In Figure ( a ), a block of mass m lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (spring constant k ) whose other end is fixed. The block is initially at rest at the position where the spring is unstretched ( x = 0) when a constant horizontal force in the positive direction of the x axis is applied to it. A plot of the resulting kinetic energy of the block versus its position x is shown in Figure ( b ). The scale of the figure's vertical axis is set by K s = 3.6 J and the scale of the figure's horizontal axis is set by x max = 4.0 m. (a) (b) a) What is the magnitude of F ? W = E mech = mv 2 2 + kx 2 2 = Fx , E K = Fx kx 2 2 at the end x=d, d= 2 F k E K (max) found at dE K dx = 0, x max = F k E k ( x = F k ) = F 2 k F 2 2 k = F 2 2 k = dF 4 b) What is the work done by the applied force? W=Fd c) Where did the block have the maximum speed? At x max Algebraic Solution: Quiz #2 (15 minutes) Feb. 10, 2011 Physics 2101 Section 7 (even) Name_________________________________________ In Figure ( a ), a block of mass m lies on a horizontal frictionless surface and is...
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SolutionsQuiz2&3 - Algebraic Solution: Quiz #2 (15...

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