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# 8b - What is the initial speed of the bullet 0.8 m 1.2 m 10...

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PHY2053 – Section 6168 Quiz #8 Friday, March 5, 2004 Name_______________________________ UFID___________________ Please read the problem carefully and be sure to show all of your work. Partial credit will be given. A 10 g bullet is fired into a 1.3 kg block that is initially at rest at the edge of a frictionless table 1.2 m high. The bullet remains in the block, and after the impact the block lands 0.8 m from the bottom of the table.
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Unformatted text preview: What is the initial speed of the bullet? 0.8 m 1.2 m 10 g 1.3 kg Solution: Momentum conservation gives: m b v b = (mb+m bl )v or b b m v )v m (m bl b + = Need to find from kinetic equations. Find time of flight from: ∆ y = ½ gt 2 or g y t ∆ = 2 Use this to get the velocity v : v = x/t = g y x ∆ ∆ 2 = 1.6 m/s Finally v b = 0.01 1.6 1.3) (0.01 + = 211 m/s...
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