……….. umbrella
……….. umbrella
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Rain is falling vertically. A man running on the road keeps his umbrella tilted but a man standing on the street keeps his umbrella vertical to protect himself from the rain. But both of them keep their umbrella vertical to avoid the vertical sun-rays. Explain.
A boy is standing on a platform which is free to rotate about its axis. The boy holds an open umbrella in his hand. The axis of the umbrella coincides with tht of the platform. The moment of inertias of the platform plus the boy sytem is 3.0xx10^-3 kg-m^ and that of the umbrella is 2.0xx10^-3 kg-m^2 . The boy starts spinning the umbrella ils 2.0xx10^-3 kg-m^2 . and that the umbrella is 2.0xx10^-3kg-m^2 . The boy starts of 2.0 rev/s with repsect to himself. Find the angular velocity imparted to the platform.
A wet open umbrella is held verticle and whirled about the handle at a uniform rate of 21 rev in 44 s. If the rim of the umbrella is a circle of 1 m in diameter and the hight of the rim above the floor is 4.9 m. The locus of the drop on the floor is a circle of radius
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