11. The impulse experienced by s body is equivalent to its change in a. velocity

Question

11. The impulse experienced by s body is equivalent to its change in a. velocity b. Kinetic energy c. Momentum. d. None of the above choices are valid. 12.A grindstone spinning at the rate of 8.,3 nevis has what approxcimate angular speed? a. 3.20 rad's b. 26.0 rad's c. 52.0 rad's d. 81.0 rad's 13. A 0.300 m radius automobile tire accelerates steadily from rest t 2.0 rad What is the centripetal acceleration of a point on the outer ed ge of the tire after 5.0 s? a. 300, m/s b. 33.0ms c 30.0 m's d. 3.00m's

Explanation / Answer

11) impulse is the force*time

from newtons secodn law force is the rate of change in momentum

so impulse is equals to the momentum

12) 1 rev/s = 1*2*3.14 rad/s = 6.28 rad/sec

w = 8.3*6.28 = 52.1 rad/s

13) a = v^2/r

v = rw

v = rw^2

w = w0+alpha*t = 0+2*5 = 10 rad/s

a = 0.3*10 = 3 m/s^2

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