14. A shaft $30 \mathrm{~mm}$ diameter is transmitting power at a maximum shear stress of $80 \mathrm{MPa}$. If a pulley is connected to the shaft by means of a key, find the dimensions of the key so that the stress in the key is not to exceed $50 \mathrm{MPa}$ and length of the key is 4 times the width.

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