A spinning raw egg and then released by the fingers will res

A spinning raw egg, and then released by the fingers, will resume spinning. Explain. Will this happen with a hard-boiled egg? Explain. Compare the magnitude of Earth\'s rotational momentum about its axis to that of the Moon about Earth. The tides exert a torque on Earth and Moon so that eventually they rotate with the same period. The object with the greatest rotational momentum will experience the smallest percent change in the momentum will experience the smallest percent change in the period of rotation. Will Earth\'s solar day increase more than the moon\'s period of rotation decreases? Explain. You lay a pencil on a smooth desk (ignore sliding friction). You push the pencil, exerting a constant force first directly at its center of mass and then close to the tip of the pencil. In both cases, the force is exerted perpendicular to the body of the pencil. If the forces that you exert on the pencil are exactly the same in magnitude and direction, in which case is the translational acceleration of the pencil greater in magnitude? If you watch the dive of an Olympic diver, you note that she continues to rotate after leaving the board. However, her center of mass follows a parabolic curve. Explain why. Explain why you do not tip over when riding a bicycle but do tip when stationary at a stoplight. Sometimes a door is not attached properly and it will open by itself or close by itself. But it will never do both. Why?

Solution

The case where the force is applied on the centre of mass will have more translational acceleration.

The force which is applied on the tip would produce translation as well as rotational motion. As, the tip would tend to move more than the far end, it would produce rotational motion along with the translational motion. So, the total energy will be distributed between the rotational and translational energy.

Where as, the force being applied on the centre of mass would only produce translational motion. So there would be only translational acceleration and it would be higher than the other case where force is being applied on the tip.