Aportion of a shaft where a gear is to be mounted has diameter of 50 mm. the gear transmits 335 n-m of torque. the shaft is to be made of sae 1040 cold-drawn steel. the gear is made from sae 8650 oqt 1000 steel the width of the hub of the gear mounted at this location is 45 mm. design the key. the standard key dimension for a 50-mm-diameter shaft would be 14mm '9 mm rectangular. material selection is a design decision. let's choose sae 1018 steel with s 372 mpa

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acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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