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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 = /r = (40 N-m)/(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