### What is the index of refraction of the unknown liquid

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Q. A model rocket is launched straight upward. Its altitude y as a function of time is given by y = bt -ct2, where b = 82 m/s, c = 4.9 m/s2, t is the time in seconds, and y is in meters, (a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?

Q. layer of oil (n = 1.45) floats on an unknown liquid. A ray of light shines from the oil into the unknown liquid. The angles of incidence and refraction are, respectively, 65.0° and 56.0°. What is the index of refraction of the unknown liquid?

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