Homework Help: physics

Posted by Kelsey on Saturday, December 11, 2010 at 9:47pm.

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 - bobpursley, Saturday, December 11, 2010 at 9:56pm
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 - mohamed mokhbat, Thursday, December 16, 2010 at 4:18pm
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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