lecture_08

# A cos 45 b sin 35 5 4 c sin 45 d cos

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Unformatted text preview: h cos! h tan ! = o / a θ = tan −1 (o / a ) θ A = “angle whose tangent is o/a” Angles measured in degrees or radians: 2π rad = 360o 1/31/2014 !" D B Dy o a D x +x o ‐ opposite a ‐ adjacent h ‐ hypotenuse PHYS‐2010 13 Room Frequency BA Clicker Ques;on Angle θ = π/4 radians. What is the measure of θ in degrees? A)  30° π = 180 deg B)  45° π/4 = 180/4 = 45 deg C)  60° D)  90° E)  180° 1/31/2014 PHYS‐2010 14 Room Frequency BA Clicker Ques;on Consider the triangle below. Which one of the following is correct? A)  cos α = 4/5 β B)  sin α = 3/5 5 4 C)  sin β = 4/5 D)  cos β = 3/4 α E)  tan α = 4/3 1/31/2014 3 PHYS‐2010 15 Special Triangles: 60° 45° 2 2 1 30° 45° 1 3 3 sin 60 = 2 o 1/31/2014 1 1 2 2 cos 45 = 2 = 2 2 o PHYS‐2010 16 Components Length, Angle !" D = ( Dx , Dy )= (4,4) !" D= |D| = +y B 2 2 Dx + Dy = 32 !" D (Pythagorean Theorem) # Dy & ) ! = tan % ( = tan "1 (1) = = 4...
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## This document was uploaded on 03/09/2014 for the course PHYSICS 2010 at Colorado.

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