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Q. A uniform thin rod of length L=2.3 m and mass 1 kg can rotate in a horizontal plane about a vertical axis through its center. The rod is at rest when a 0.6 kg ball of putty, moving in the horizontal plane of the rod, hits and sticks to one end. As viewed from above, the ball's velocity vector makes an angle of θ =60° with the rod. If the ball's speed just before impact is 100 m/s, what is the angular velocity of the rod immediately after the collision?

Q. What is the thinnest film of on glass that produces a strong reflection for orange light with a wavelength of 600 nm?

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