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The Wright Brothers’ plane had a 2.4 m ( diameter) long propeller that operated at a constant 350 rpm (revolutions per minute). Find the acceleration of a particle at the tip of the propeller.

What is the steepest incline on which a vehicle can remain parked without the wheels slipping? The coefficient of static friction between the tires and the incline is 0.90.

A man has a weight of W. He is standing at the center of the string according to the picture. Person_on_Wire.png The magnitude of the Tension in the string

Three different skiers start from rest. They ski from the top of a hill from the same height but take different paths (see the figure). The friction is negligible. Which skier has the largest speed at the bottom of the hill? Three_Skiers_Varying_Track.png

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.