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09_19_Problem_Solving

# 09_19_Problem_Solving - x ∆ t v f 2 ∆ v 2 ∆ x ∆ t 2...

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9/19 Problem Solving / Text examples from chapter 2 and 3 / Exam I Thursday, 9/20 5-7 p.m. Wit 116 / No HW assigned today Choose problems from the text to do. Avoid those that give a, x, and one of the v’s. / Lab: “Kinematics” I know this #@%\$!

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Reasoning, not math!!!!!!! Exam: Use arrows to find v and a May not use t = 2 x/a to find x or a May use knowledge of speeding up, slowing down for relative directions for a and v Be willing to expose your reasoning skills. Attempts at reasoning are better that guessing with math.
Projectile Motion Example 2: An object is dropped from rest from a height of 45m above the ground. The acceleration is 9.8m/s 2 directed down. How long is the object in the air? What is its velocity just before it gets to the ground? a v t v ave

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Unformatted text preview: x ∆ t v f 2 ∆ v 2 ∆ x ∆ t 2 a Projectile Motion Example 3: A ball rolls off a table that is 45m above the ground. The acceleration is 9.8m/s 2 directed down. The initial velocity of the ball is 10m/s right. How long is the object in the air? What is its velocity just before it gets to the ground? (same as previous) Projectile Motion 3-25 v o = 135m/s at 15 ° above/below the horizontal. What is the velocity, magnitude and direction, just before it hits the ground? Note: drawing is not perfectly accurate. Acceleration is 9.8m/s 2 down. Find initial components Find ∆ t to the highest point Find ∆ x to the highest point Add this to 2000m Find ∆ t to fall from highest point Find ∆ v y from highest point (this is v fy )...
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