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1) A ballistic pendulum consists of a 3.60 kg wooden block on the end of a...

1) A ballistic pendulum consists of a 3.60 kg wooden block on the end of a long string. From the pivot point to the center‐of‐mass of the block is a distance of 2.80 m. With the pendulum hanging straight down, a rifle bullet of 28.0 g mass moving with a speed of 210 m/s embeds itself into the wood. To what maximum angle does the pendulum (with embedded bullet) swing upward?

2) The thorium‐228 nucleus decays by emitting an alpha particle with a speed of 1.8 x 107 m/s.What is the recoil speed of the remaining radon atom? The thorium nucleus mass is 3.8 x 10-25 kg, and the alpha‐particle (Helium nucleus) mass is 6.68 x 10-27 kg.

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