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Unformatted text preview: Abd Elhai, Mohamed – Homework 10 – Due: Apr 21 2008, 9:00 pm – Inst: Dr Kevin Dean 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This is ONLINE HOMEWORK No. 10 It is due by 06:00 AM Abu Dhabi Time on Tuesday 22 April (9:00 PM Monday 21 April, Texas time). 001 (part 1 of 3) 5 points A solid sphere of radius R and mass M is held against a wall by a string being pulled at an angle θ . f is the magnitude of the frictional force and W = M g . W P F θ R Towhatdoesthetorqueequation X i ~ τ i = 0 about point O (the center of the sphere) lead? 1. F = f 2. W = f 3. F cos 2 θ = f 4. F sin θ cos θ = f 5. F + W = f 6. F sin θ = f 002 (part 2 of 3) 5 points To what does the vertical component of the force equation lead? 1. F cos θ + W = f 2. F sin θ = W 3. F sin θ + f = W 4. F sin θ = f 5. F sin θ = f + W 003 (part 3 of 3) 5 points Find the smallest coefficient of friction μ needed for the wall to keep the sphere from slipping. 1. μ = sin θ 2. μ = cos θ 3. μ = 1 cos θ 4. μ = 1 tan θ 5. μ = 1 sin θ 6. μ = tan θ 004 (part 1 of 1) 5 points A ladder is leaning against a smooth wall.A ladder is leaning against a smooth wall....
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