1. A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 36.0 kg and diameter 80.0 cm. The power is off for 25.0 s, and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 160 complete revolutions

a. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on?

b. How many revolutions would the wheel have made during this time?

 

2. An advertisement claims that a centrifuge takes up only 0.127 mm of bench space but can produce a radial acceleration of 2200 gg at 5000 rev/min rev/min. Calculate the required radius of the centrifuge. 

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1 a To find out how long it would have taken the flywheel to stop if the power had not come back on ... View the full answer