Chapter 5, Problem 67P

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A box with friction coefficient of 0.2 rests on a 12 foot long plank of wood.  How high (in feet) must one side of the plank be lifted in order for the box to begin to slide?

What is a good general rule to follow in order to find the best choice of coordinate system to solve a dynamics problem?

What is the meaning of a first order approximation?

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A hydrogen atom has just a single electron orbiting the nucleus, which happens to be a single proton without any neutrons. The proton is positively charged, the electron negatively, but both with the same magnitude of charge given by e=1.602x10-19C. The mass of an electron is 9.11x10-31kg, and the proton is 1.67x10-27kg. Find the ratio of the electrostatic to the gravitational force of attraction between the electron and the proton in hydrogen. \

What is the third law pair to the normal force as you sit in a chair?  What effect does the sun's pull on earth have in terms of third law pairs?

Using Newton's 2nd law, show that all objects subject to the pull of gravity alone should fall at the same rate. What is that rate?

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