A wagon with mass 4.5 kg is dragged along a flat surface with constant velocity by a force of 73 N at an angle of 27 degrees above the horizontal. How big is the normal force acting on the wagon? How big is the frictional force acting on the wagon?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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