hw 10 - Patel(pnp223 – homework 10 – Turner –(92160 1...

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Unformatted text preview: Patel (pnp223) – homework 10 – Turner – (92160) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A snowboarder of mass m is at rest on the top of a sand dune. The coefficients of static and kinetic friction are μ s and μ k , respectively. The acceleration of gravity is 9 . 8 m / s 2 . m μ s μ k θ What is the angle θ the incline must exceed so that the snowboarder starts sliding? 1. θ = arcsin μ s 2. θ = 1 arctan μ s 3. θ = arcsin μ k 4. θ = arctan μ k 5. θ = 1 arctan μ k 6. θ = arccos μ s 7. θ = arccos μ k 8. θ = arctan μ s 002 (part 2 of 2) 10.0 points What is the acceleration down the incline if θ exceeds the value found in the previous question? 1. a = g ( μ k sin θ- μ s cosθ ) 2. a = g ( μ s sin θ- cos θ ) 3. a = g μ k cos θ 4. a = g μ s cos θ 5. a = g (sin θ- μ s cos θ ) 6. a = g (sin θ- μ k cos θ ) 7. a = g μ s sin θ 8. a = g ( μ k sin θ- cos θ ) 9. a = g (...
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hw 10 - Patel(pnp223 – homework 10 – Turner –(92160 1...

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