A meteor starts from rest at a very great distance from the earth. Knowing that the radius of the earth is 6370 km and neglecting all forces except the gravitational attraction of the earth, determine the speed of the meteor (a) when it enters the ionosphere at an altitude of 1000 km, (b) when it enters the stratosphere at an altitude of 50 km, (c) when it strikes the earth’s surface.

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Q: An aircraft flying at a height of 800m with uniform horizontal velocity of 360km/hr releases a bomb…

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Q: I m's 1.5 m/s PROBLEM 13.155 The coefficient of restitution between the two collars is known to be…

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Q: A spring AB of constant k=200kn/m is attached to a support at A and to a collar of mass m=D200 gm.…

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A:

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Q: Packages in an automobile parts supply house are transported to the loading dock by pushing them…

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.