sp09midterm - Midterm Exam March 5 2009 NAME Units must be...

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Midterm Exam, March 5, 2009 NAME: Units must be included in final answers, where appropriate. Note on constants: Magnitude of gravitational acceleration = g = 9.8 m/s 2 Problem 1 A projectile is fired with a speed of 56 m/s at a launch angle of 30 with respect to level ground. a.) What is the maximum height attained by the projectile? b.) Sometime before reaching the top of the trajectory, the projectile has a vertical displacement of half the maximum height. What is the vertical component of the velocity of the projectile when it is at half the maximum height of the trajectory? c.) How far has the projectile traveled horizontally when it first reaches half the maximum height of its flight path?
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Problem 2 h 45 A block of mass m = 25 kg slides down an incline of angle 45 . The coefficient of kinetic friction between the surface of the incline and that of the block is μ k = . 26. The block starts its motion at a height of h = 3 / 2 2 . 12 m above the ground. a.) Draw a free body diagram for the block. b.) What is the acceleration of the block? c.) What is the work done on the block by the friction of the incline as it moves from height h to the bottom of the incline?
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