A hollow shaft is 1 m long and has external diameter 50 mm. It has 20 mm internal diameter for a part of length and 30 mm internal diameter for the rest of length. If the maximum shear stress is not to exceed 80 N/mm², determine the maximum power transmitted by it at a speed of 300 rpm. If the twists produced in the two portions of the shaft are equal, find the lengths of the two portions. Refer Fig. 9.7.3. 1 L1 1 m Fig. 9.7.3 L2

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.