A rocket is rising vertically at a rate of 4900 miles per hour. An observer on the ground is standing 18 miles from the rocket’s launch point. How fast (in revolution per minute) is the angle of elevation between the ground and the observer’s line of sight of the rocket increasing when the rocket is at an elevation of 32 miles?

Q: +r

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.