Math
Pre-Algebra - Calculus 
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collision
In the collision described in Problem 2 above, consider an 85 kg passenger in each vehicle. What... ..?
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circular motion
An amusement park ride turns in a vertical circle (see, for instance, http://www.youtube.com/watch?v=sK010K3YprU). If riders are at a radius of... .. vertical.
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Electromagnetic Theory
Starting from Derive the solution of the above equation. The answer must be an expansion in spherical harmonics. You can also us... ..n. :-)
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tether ball problem
Randan is helping build a playground for his neighborhood and is asked to buy a rope for a tetherball setup (see photo at right). Th... ..?
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box on box
The boxes in the figure below are initially at rest. The coefficient of static friction is 0.60 between the boxes and between the lo... ..less.
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