For a system in simple harmonic motion, which of the following is the time required to complete a cycle of motion?

a. frequency b. amplitude c. period d. revolution

The answer is c. the period.

What does the length of a force vector represent?

The length of a force vector represents the magnitude of that force.

A newton is equivalent to which of the following quantities?

a.	kg	c.	kg·m/s^2
b.	kg·m/s	d.	kg·(m/s)^2

The answer is c. kg*m/s^2.  Newtons are the SI unit of force (units of mass*distance/time^2).