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A person is standing on a platform that is free to rotate around a vertical axis (frictionless).  Initially the person and the platform are not rotating. The person holds a wheel in their hands that when viewed from above is rotating in a counterclockwise (ccw) direction. The person flips the wheel over so now viewed from above it is rotating in a clockwise (cw) direction. Which of the following statements best describes what happens after the wheel is flipped and why? 

By what factor must one change the weight suspended vertically from a spring coil in order to triple its period of simple harmonic motion?

The following graphs show an aspect of motion as a function of time. Take note of the y axis of each graph. Which of the graphs show a motion that has a constant non-zero acceleration? Four_Graphs.png

The diagram shows a mass, M, starting at point A with a speed vo.  The mass moves along a path that includes a hill of height, h, a valley of height –h/2, and when it reaches point B, which is at the same height as point A, it has a speed, v = 0.5vo.  Which of the following expressions correctly corresponds to the work done by an external force (Fext)? 

Which blood type is the universal receiver?

An individual with type O blood can receive which of the following? Select all that apply.

Which of the following best describes glacial movement?

This wind transport mechanism moves large particles by sliding or rolling them along the surface.

Barrier islands gradually migrate further over time.

How many distinct permutations are there of the letters in the word “HAWAII”?