Lecture_5_-_Additional_Notes

Lecture_5_-_Additional_Notes - Example: As an airplane...

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Example : As an airplane takes off, it climbs with a constant speed of 75 m/s. The plane’s velocity vector makes an angle of 15 deg. with the horizontal. nfortunately, when the plane reaches an altitude of 2500 m during this Unfortunately, when the plane reaches an altitude of 2500 m during this climb, one of its engines falls off. How long does it take the engine to hit the ground below? v o = 75 m/s 15 o y y o = 2500 m v oy x y f = 0 m 8m/s 2 ) 2500 )( 9 . 4 ( 4 ) 4 . 19 ( 4 . 19 2 ± a y = -9.8 m/s 2 2 1 t a v y y y o o f y + + = ) 9 . 4 ( 2 = t 222 4 . 19 ± m/s 4 . 19 ) 15 )(sin 75 ( 15 sin = = = o o o o v v y 2 9 . 4 4 . 19 2500 0 t t + = ) 9 . 4 ( 2 t s 6 . 24 or s, 7 . 20 = = t t
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Example : A golf ball rolls off a horizontal cliff with an initial speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below. (a) How uch time does the ball spend in the air? (b) What is the speed f the ball much time does the ball spend in the air? (b) What is the speed
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Lecture_5_-_Additional_Notes - Example: As an airplane...

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