what is the horizontal distance of the center of gravity of the person-ladder system from the point where the ladder touches the ground?

Amachine, modeled as a simple spring-mass system, oscillates in simple harmonic motion. its acceleration is measured to have an amplitude of 5,000 mm/s with a fre- quency of 10 hz. compute the maximum displacement the machine undergoes during this oscillation.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane