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Homework Help: Finding the magnitude of a net force

  1. Nov 4, 2009 #1
    2 problems both with dealing with finding the magnitude of a net force.

    1. A gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25 N downward, and the force of the wind on the apple is 1.05 N to the right. Find the magnitude and direction of the net force on the apple.

    2. The wind exerts a force of 452 N north on a sailboat, while the water exerts a force of 325 N west on the sailboat. Find the magnitude and direction of the net force on the sailboat.

    I found the direction already.
    tan theta = x/y

    1. 1.05/2.25 tan-1 = 25 degrees

    2. 325/452 tan-1 = 35.7 degrees

    So how do you find magnitude?
  2. jcsd
  3. Nov 4, 2009 #2
    never mind. i figured it out. you have to use Pythagorean theorem.
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