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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 6th Edition
3
Kinematics in Two Dimensions; Vectors
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3-2 to 3-4: Vector Addition
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3-5 and 3-6: Projectile Motion (neglect air resistance)
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3-8: Relative Velocity
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Problem 10
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a) (24.0,11.6)(24.0, 11.6)
b) R=26.7 units 25.8∘ above pos. x axisR=26.7 \textrm{ units } 25.8^\circ \textrm{ above pos. x axis}
Giancoli 6th Edition, Chapter 3, Problem 10 solution video poster
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COMMENTS
By sola115122 on Sat, 9/21/2013 - 8:48 PM

Why is it positive above the x axis? Im more of a conceptual type of person.

By Mr. Dychko on Sat, 9/21/2013 - 9:41 PM

This is just a math convention that "people" have agreed upon. Angles are positive counterclockwise starting from the x-axis, and negative going clockwise from the x-axis. An angle giving according to this convention is said to be in "Standard Position", which is a term you'll also come across in the trigonometry unit in mathematics class.

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