I am totally lost in physics, can someone help me?

Question

I am taking physics and I am having trouble with the vector section. I am mostly having trouble with sin, cos, and tan. I did not take trigonometry so this might be why I don't know what to do with these terms. How do you find the sin or cos of an angle for example cos of a 25 degree angle and sin of a 25 degree angle. I did it in the calculator using the cos and sin buttons and then putting 25 in parenthesis but it gives me a different answer than the book. Can anyone explain clearly for a beginner?

Answer 1

For physics, most likely you need to set your calculator's mode to 'degrees', and then try again. The radian function is used more often in mathematics than in physics.

Answer 2

Make sure you have the angle specified in degrees or radians as you prefer. pi radians = 180 degrees. Check this by pressing the MODE button on a TI 83+. 25 degrees =
25pi/180 = .436332313 radians.

Answer 3

when you do the math on a calculator you have to set it for degrees or radians. these are to measuring units for angles, as sin, cos and the rest are trigonometric functions with angle input and a number between -1 +1 as output

more details on: http://en.wikipedia.org/wiki/Trigonometry

Answer 4

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