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Q. A person stands a distance of .30 m from the right end of a 2 m long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0kg and the person's mass is 75.0kg. (a) Find out the force exerted on the board by post on the left end and (b) determine the force applied on the board by the post on the right end.

Q. The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find out the wavelengths of these extremes while speed of sound in air is equal to 348 m/s.

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