Calculating the holding torque in a gear box.

A gear box has the input power 10kw at 2400 rev/min. The gear ratio is a reduction of 2 to 1. The efficiency is 98%. What is the holding torque required?

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...ember that Power is = Torque (T) * rotational speed (w). In such a way,

T2 * W2 = 9.8 Kw

But W2 = 2 W1. ...