) A particle of mass 3kg is attached to the centre of a smooth table by a light inextensible string. If the particle is moving in a horizontal circle with speed 2v2 m/s and the string is 2 m long. Find (a) the angular speed, (b) the tension in the string. ii) A wheel of radius 0.5 m completes 6 revolutions in 3 seconds while rotating with a constant speed. Find (c) its angular speed in rad/s, (d) its acceleration. iii) An elastic string of natural length 0.4m and modulus of clasticity 16N is stretched until the tension in it is 9N. Calculate the extension in the string.

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The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: