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Unformatted text preview: What is the torque due to gravity around the bottom of the ladder? (Hint: you can assume gravity acts at the center of the ladder.) torque = (length of lever arm) x (perpendicular component of force to lever) 2 Quiz 7  Rubric Problem 1 Q  1.5  correct answer (80 N) reasoning: F ⊥ = τ /r = (40 Nm)/(0.5 m) R  1.2  minor calculational error U  0.2  major error Problem 2 Q  1.5  correct answer (to the left of the bike) and explanation (right hand rule) R  1.0  correct answer but wrong explanation S  0.2  incorrect Z  0.0  blank Problem 3 Lever arm = 1.5 m; perpendicular force = 150 N ∴ torque = 225 N Q  1.5  correct answer S  1.0  incorrectly obtained perpendicular component of force T  1.0  wrong lever arm (should be 1.5 m) U  0.5  major errors (both S and T or other) W 0.0  blank or negligible work mg cos 60 o = 150 N...
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 Spring '10
 Cebra
 Energy, Force, Simple machine, mechanical advantage

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