A neon atom makes a perfectly elastic collision with
Chapter 7, Problem 48(choose chapter or problem)
A neon atom makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 55.6 angle from its original direction and the unknown atom travels away at a angle. What is the mass (in u) of the unknown atom? [Hint: You could use the law of sines.]
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