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Newton's Three Laws
  
 
Problems
Problem 1.1: Magnetic forces are often at least as powerful as gravitational forces. Consider a 5 kg piece of iron suspended in mid-air by a powerful magnet above the piece of iron. How much force does the magnet exert on the iron? [Solution]
Problem 1.2:
The earth rotates around the sun with a constant speed. Is the earth an inertial reference frame?
[Solution]
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