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Q1. A disc of mass M and radius R is rolling purely without slipping with velocity V on a flat horizontal floor. When it hits a step in the floor of height R/2.what is the velocity of the center of mass of the disc just after impact.

Q2. A piece of moon rock reads 3.800 N on a scale when in air, but 2.156 N in a fluid having a density of 790 kg/m^3. What is the density of te moon rock in kg/m^3?

A) An electron has the same energy as a photon of blue light (400 nm). What is the momentum of the electron?

B) What is the ratio of the momentum of the electron to momentum of the photon?

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Category:- Physics
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