# Answer to Question #64087 in Mechanics | Relativity for Mai

Question #64087

7. An 80-kg man and his car are suddenly accelerated from rest to a speed of 5 m/s

as a result of a rear-end collision. Assuming the time taken to be 0.3s, find:

a) the impulse on the man and

b) the average force exerted on him by the back seat of his car.

8. An airplane propeller is rotating at 1900 rev/min.

a. Compute the propeller's angular velocity in rad/s.

b. How long in seconds does it take for the propeller to turn through 30.0

degrees?

9. A disk with a 1.0-m radius reaches a maximum angular speed of 18 rad/s before

it stops 30 revolutions after attaining the maximum speed. How long did it take

the disk to stop?

as a result of a rear-end collision. Assuming the time taken to be 0.3s, find:

a) the impulse on the man and

b) the average force exerted on him by the back seat of his car.

8. An airplane propeller is rotating at 1900 rev/min.

a. Compute the propeller's angular velocity in rad/s.

b. How long in seconds does it take for the propeller to turn through 30.0

degrees?

9. A disk with a 1.0-m radius reaches a maximum angular speed of 18 rad/s before

it stops 30 revolutions after attaining the maximum speed. How long did it take

the disk to stop?

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