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Unformatted text preview: Physics 8A Review Session – Midterm 1 Problem 1: Launching a rocket A rocket rises vertically from rest, with an upward constant acceleration of 4.2 m/s² until it runs out of fuel at a height of 1200 m. After this point, the acceleration is that due to gravity alone. (a) Calculate the speed of the rocket at the instant that it runs out of fuel. (b) How long does it take for the rocket to run out of fuel? (c) Calculate the maximum height that the rocket reaches. Problem 2: Balancing masses Two equal masses are connected by a massless, unstretchable string over a frictionless pulley. The angled surface is also frictionless, but the horizontal surface has 4 . = s μ and 3 . = k μ (a) Find the maximum angle of the ramp max θ for which the system can remain at rest. (b) If max 2 θ θ = calculate the acceleration of the masses. Problem 3: Pushing a box on different surfaces Magic Mike pushes a 20 kg box (starting from rest) across the floor a total distance of 25 meters. The first 10 meters are frictionless, while the last 15 meters have a coefficient of sliding friction of 0.3. first 10 meters are frictionless, while the last 15 meters have a coefficient of sliding friction of 0....
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This note was uploaded on 10/25/2009 for the course PHYSICS 8A taught by Professor Jacobsen during the Fall '07 term at Berkeley.
 Fall '07
 JACOBSEN
 Physics, Acceleration

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