Задача id8791

The dynamo is driven into rotation by a steam engine using a belt drive. The steam engine pulley has a radius R = 75 cm, and the dynamo pulley has a radius r = 30 cm. The steam engine starts moving from rest and rotates with an angular acceleration of 0.4 πsec-2. How long will it take for the dynamo to rotate at 300 rpm?

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