# cw14 - patel(kp9583 CW14 Mackie(20211 This print-out should...

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patel (kp9583) – CW14 – Mackie – (20211) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A student performs a ballistic pendulum experiment using an apparatus similar to that shown in the figure. Initially the bullet is fired at the block while the block is at rest (at its lowest swing point). After the bullet hits the block, the block rises to its highest position, see dashed block in the figure, and continues swinging back and forth. The following data is obtained: the maximum height the pendulum rises is 6 cm, at the maximum height the pendulum sub- tends an angle of 53 . 1 , the mass of the bullet is 83 g, and the mass of the pendulum bob is 833 g. The acceleration of gravity is 9 . 8 m / s 2 . 833 g 83 g v i v f 53 . 1 6 cm Determine the initial speed of the projec- tile. Correct answer: 11 . 968 m / s. Explanation: Let : θ = 53 . 1301 , m 1 = 83 g , m 2 = 833 g , and h = 6 cm = 0 . 06 m .

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