during the game against the kansas city chiefs last sunday michael vick threw a

Question

during the game against the kansas city chiefs last sunday michael vick threw a football in a tight spiral. (a) if the ball spun at a rate of 650 rpm, what was its angular velocity in rad/s? (b) if it spun for 1.2 seconds before it was caught by percy harvin, how many radians did it rotate in total and how many revolutions did it rotate in total? Assume there was no air resistance.

Now lets consider more realistic situation in which there was air resistance. So, the ball slowed down and spun slower (350 rpm ) when it was caught by percy (c) what was the angular acceleration? (b) in this case how many revolutions did the ball make?

Explanation / Answer

PART 2

w2 = w1 + at

350=650 +a1.2

a= -250 rev/sec2 = - 2*3.141*250

a= 1570.796rad/sec2

average rev = [(650+350)/2]*1.2/60 = 10

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