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Section 4-8 There are two kinds of applications we will study in section 4-8 1) Right triangle trigonometry (angle of elevation/depression and navigation) 2) Sinusoids (Ferris wheel, harmonic motion) ex. From the top of a 100 ft tall building a man observes a car moving toward the building. If the angle of depression of the car changess from 20 to 42 during the period of observation, how far does the car travel? Ex A patrol boat leaves port and averages 35 knots traveling for 2 hours on a course of 53 and then 3 hours on a course of 143 . What is the boat's bearing and distance from port. Ex. A mass oscillating up and down on the bottom of a spring can be modeled as harmonic motion. If the weight is displaced a maximum of 5 cm, find a modelling equation if it takes 2 seconds to complete one cycle. Ex. A Ferris wheel 50 ft in diameter makes one revolution every 40 sec. If the center of the wheel is 30 ft above ground, create a model of the height of a rider in terms of time. How long after reaching the low point is the rider 50 ft above the ground?