B find the magnitude of the friction force exerted by

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b) Find the magnitude of the friction force exerted by the bed on the crate when the truck decelerates at 1.2 m/s 2 . c) Find the magnitude of the friction force exerted by the bed on the crate when the truck decelerates at 3.5 m/s 2 . 4. Problem 12.39 in your book. 5. Gravity causes a gymnast to rotate from a horizontal position clockwise around a high bar. Assuming she keeps her body in a straight line as she rotates the distance from her hands to her center of gravity is constant and = L: a) write expressions for position, velocity, and acceleration of the center of gravity using a Cartesian coordinate system and the origin indicated. b) use conservation of angular momentum to write an expression for ˙ ˙ " . c) What does the equation in part b tell us about the relationship between acceleration and the gymnast’s mass? height?

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Work Energy Methods (Ch 13) 6. A 3,500 lb car is traveling down a 6 o incline at 60 miles per hour when the breaks are suddenly applied, producing a breaking force of 1.500 lb.
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