For cos(2.51 rad) I tried —> cos(sqrt2.51) and answered 0.999 & 1.00 and both an

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For cos(2.51 rad) I tried —> cos(sqrt2.51) and answered 0.999 & 1.00 and both answers were wrong; I tried sqrt bc I thought that’s what was meant by rad (not sure what rad means) —> cos(2.51) and got 0.999 and that was wrong previously
-last question I’m just really confused about how to even approach it.
2 LON-CAPA (5) Calc: Ang X https://spock.physastuga.edu/res/uga/Physic Lib/MathModules Calculator/angle calcs prob PHYS 1111: Intro Physics I (Mech cle Secure Janina N. Vega-rodriguez v (Student section: 27121) Main Menu ContentsGrades Course Contents »...>» Problem Set 1 (5) Calc: Angles Use a scientific calculator for the following problems. Calculate the quantity tan(111.9°). 2.488 Good! Always make sure that your calculator is in the correct angle mode. You are correct: Your receipt no, is 161-8635 Previous Tries Calculate the quantity cos(2.51 rad). 1.000 Submit Answer Incorrect. Tries 3/6 Previous Tries A straight line has a slope of 2.82. Calculate the angle that the line makes With the +x (horizontal) axis. 0 355 deg Submit Answer Incorrect. Tries 1/6 Previous Tries Threaded View Chronological view 0ther Views NEW Emly L Haynes Reply (Wed Jan 10 12:12:06pm 2018 (EST) Im not sure how to solve this. I've tried to use trig to solve this but I don't have enough informatio

Explanation / Answer

Just like degree, radian (short: rad) is a unit of measurement of angles.

In your calculator, you have to change the angle mode from degree to rad and then proceed with the calculations.

It gives:

cos(2.51 rad) = -0.8071

Slope = tan (th), where th is the required angle.

Therefore:

th = arctan (slope)

= arctan(2.82)

= 70.47 degrees

(arctan is the inverse tangent; remember to change the mode of your calculator to degrees while calculating for the last part)

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