Consider beam ABC of the seesaw to be a slender rod with a mass of 3kg. (Hint: Irod = mL2/12)  One day, clumsy Goofy got tripped and lost control of the 0.6kg ball he was playing with. The ball hit the end A of the beam ABC that was initially at rest. Just before impact, the velocity of the ball is 8m/s directed 75 degrees from the horizontal as indicated. Note: Point G is the centroid of the beam. 1. Just after impact, the vertical component of the velocity of end C of the beam is 4 m/s upward. Which of the following best approximates the angular velocity of the beam ABC just after impact? 2.  Just after impact, the ball bounces purely vertically. Which of the following best approximates the magnitude of the velocity of the ball just after impact? 3. Which of the following best approximates the coefficient of restitution between the ball and the beam? 4. If the ball was in contact with the beam for 0.002 s, which of the following best approximates the magnitude of the reaction force at B?

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Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.