# physics

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The blades of a fan running at low speed turn at 200 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to 340 rpm in 5.92 s.

How many revolutions do the blades go through while the fan is accelerating?

• physics -

change rpm to rev per second

wf^2=wi^2+2*a*revolutions if wf,wi are in rev/sec, a is rev/sec^2

a= wfinalinrev/sec / 5.92sec

• physics -

The magnetic field in a cyclotron is 0.50T. What is the magnitude of the magnetic force on a proton with velocity of 1.0 x 107 m/s in a plane perpendicular to the field?

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