1. Suppose you start an antique car by exerting a force of 300 N on its crank fo

Question

1. Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250 s. What angular momentum is given to the engine if the handle of the crank is 0.300 m from the pivot and the force is exerted to create maximum torque the entire time?
2. Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.
3. Two 25 kg children are sitting on a merry go round that is rotating at 0.10 rad/s. If one child is 1.0 m from the center and the other is 1.5 m from the center, what is their combined angular momentum?
1. Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250 s. What angular momentum is given to the engine if the handle of the crank is 0.300 m from the pivot and the force is exerted to create maximum torque the entire time?
2. Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.
3. Two 25 kg children are sitting on a merry go round that is rotating at 0.10 rad/s. If one child is 1.0 m from the center and the other is 1.5 m from the center, what is their combined angular momentum?

2. Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.
3. Two 25 kg children are sitting on a merry go round that is rotating at 0.10 rad/s. If one child is 1.0 m from the center and the other is 1.5 m from the center, what is their combined angular momentum?

Explanation / Answer

1. torque = r x F = 0.300 x 300 = 90 N m

torque x time = delta(L)

delta(L) = 90 x 0.250 = 22.5 kg m^2 /s ......Ans

2. torque = r x F

0.6 x 17.5 = 0.450 F

F = 23.3 N

3. L = ((25 x 1^2) + (25 x 1.5^2) )(0.10)

L = 8.125 kg m^2 /s

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