rod ab is fixed to a smooth collar d, which slides freely along the vertical guide. determine the internal normal force at point c, which is located just to the left of the f=68-lb concentrated load.

avoid hitting the Earth, an orbiting projectile must be launched with a horizontal speed. Projectile launched horizontally with a speed of about 8000 m/s will be capable of orbiting the earth in a circular path. This assumes that it is launched above the surface of the earth and encounters negligible atmospheric drag.

Explanation: