Two flywheels of negligible mass and different radii are bonded together and rotate about a common axis (see below). The smaller flywheel of radius 30 cm has a cord that has a pulling force of 50 N on it. What pulling force needs to be applied to the cord connecting the larger flywheel of radius 50 cm such that the combination does not rotate?

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22 September, 21:51

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Cassidy Daniel · Answer 1

Torque on smaller wheel

= F x r

50 x. 30

= 15 Nm

Torque on larger wheel

= F x. 5

For equilibrium

F x. 5 = 15

F = 15 /.5

= 30 N