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29 Conservation of Angular Momentum

# 29 Conservation of Angular Momentum - A wheel is free to...

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A wheel is free to rotate on an axle that has a built-in motor. If the axle is placed on the ice and the motor begins to turn the wheel, what happens to the axle? a) It begins to turn the same direction, with the same speed. b) It begins to turn the opposite direction, with the same speed. c) It falls over. d) It does not turn ( L is not conserved because of the motor). e) None of the above. motor axle wheel
A toy cannon is fixed onto a 6m-diameter merry-go-round at one half the radius. When the cannon is fired, the merry-go-round begins to rotate with an angular momentum of 150 kg*m 2 /s 2 . Given that the cannonball is 400g, what is the exit speed of the ball? cannon

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The earth travels around the sun in an elliptical pattern. When is the earth travelling at the greatest speed? a) When it is closest to the sun. b) When it is farthest from the sun. c) Between the closest and farthest positions. d) The earth travels at a constant speed.
A long pole is free to rotate about its center. A paddle is attached to the end of the pole and you wish to get it moving fast by throwing a ball at the paddle. Should you throw a sticky ball or a bouncy ball?

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