The figure shows a view of the Earth as looking down from the North Star. From t

Question

The figure shows a view of the Earth as looking down from the North Star. From this viewpoint, the Earth spins counterclockwise with a spin rate  of 2 radians per day. The drawing, which is not to scale, shows a man standing on a spring scale at the Earth's equator; since our planet rotates, this man will travel the circumference of the Earth once every 24 hours. Compare two forces, the force on gravity on the man by the Earth and the normal force on the man by the scale. Which force is larger?

A- The gravity force is larger. B- The contact force by the scale is larger. C- The two forces must be the same size by Newton's Third Law. D- The two forces must be the same size by Newton's First Law. C) Not to Scale

Explanation / Answer

c) The two forces must be same by Newton's third law which says that to every action there is an equal and opposite reaction.

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