# physics

A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at a rate of about 3000 revolutions per minute.Why will the time base setting 10ms?cm dispaly clearly separate pulses on the screen?

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1. Rotation is 3000 rev per min.
F=1/T or T=1/F
F is measured in rev per second.
F=3000/60=50
T=1/50=0.02s
S to MS is x1000 so 0.02s => 20ms
Hence, it is appropriate to use 10ms/cm for a clear display of pulse.

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posted by Janet

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