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December 20, 2014

December 20, 2014

Posted by **anonymous** on Saturday, October 15, 2011 at 9:17am.

- physics -
**drwls**, Saturday, October 15, 2011 at 9:22amThe sum of the three force vectors must be zero since there is no acceleration.

The third force will be the equilibrant (which is minus the resultant) of the first two.

Since the first two forces are perpendicular, the equilibrant magnitude is given by the Pythagorean theorem. It is 6.67 N

- physics -
**anonymous**, Saturday, October 15, 2011 at 9:37amWhen you push a 1.70 kg book resting on a tabletop it takes 2.60 N to start the book sliding. Once it is sliding, however, it takes only 1.50 N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between the book and the tabletop?

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