NCERT Example 7.15 || ncert Class 11th physics || NCERT Chapter 7 || System of particles

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NCERT Example 7.15 || ncert Class 11th physics || NCERT Chapter 7 || System of particles #physicsclass11

Example 6.15
Example 7.15
A cord of negligible mass is wound round the rim of a fly wheel of mass 20kg and radius 20cm. A steady pull of 25N is applied on the cord as shown in Fig. The flywheel is mounted on a horizontal axle with frictionless bearings.
(a) Compute the angular acceleration of the wheel.
(b) Find the work done by the pull, when 2m of the cord is unwound.
(c) Find also the kinetic energy of the wheel at this point. Assume that the wheel starts from rest.
(d) Compare answers to parts (b) and (c).

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