A room has dimension 10cm×15cm ×20com the recerberation time for an empty room is 0.4sec find the average absorption coefficient of the room if the room is provided with curtain clothes of absorption coefficient 0.5what area is covered by the clothes.

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."