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Phys_115_Mock_Midterm_Questions_and_Solutions_2012

# Chapter3problem92partbonlyatoycartofmassm1movesonfrict

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Unformatted text preview: ic energy is always conserved 14. If an object weighing 40 N rests without moving on a table that is slanted by 10⁰, what can we say about its coefficient of friction? a. µs ≥ 0.18 b. µs = 0.23 c. µs ≤ 0.18 d. µk = 0.18 Part B: Long Answer You only have to do 2 out of the 3 long answer questions. 1. If a ball with mass 2.55 kg is thrown at 31.5 m/s from the ground at an angle of 50.0⁰ from the horizontal, and it hits the ground at the same elevation with a velocity in the x‐direction of 11.0 m/s and a velocity in the y‐direction of ‐15.0 m/s, how much work was done to the ball in the air? 2. Chapter 3, Problem 92, part (b) only. A toy cart of mass m1 moves on frictionless wheels as it is pulled by a string under tension T. A block of mass m2 rests on top of the cart. The coefficient of static friction between the cart and the block is . Find an expression for the maximum tension T that will not cause the block t...
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