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Physics 1 Problem Solutions 122

Physics 1 Problem Solutions 122 - 118 Chapt 13 Equilibrium...

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118 Chapt. 13 Equilibrium and Elasticity c) Why is there a center of mass, Alex? d) Why is there a center, Alex? e) Why is there a universe, Alex? 013 qmult 00400 1 3 5 easy math: simple beam torque calculation 4. An object of mass 1 kg sits on a horizontal beam at 1 m from a pivot point. What is the torque about the pivot point that the weight of the mass causes? a) 1 N m. b) 2 N m. c) 3 N m. d) 4 N m. e) 9.8 N m. 013 qmult 00500 2 3 1 moderate math: torque calculation with a beam 5. Two objects are sitting on a uniform horizontal beam. The beam rests on a pivot at its center of mass. The beam is free to rotate about the pivot. Object 1 sits on the left-hand side of the pivot at a distance 1 from the pivot. Object 2 sits on the right-hand side at a distance 2 . Given m 1 = Nm 2 , what is 2 in terms of 1 ? HINT: Draw a diagram. a) 2 = Nℓ 1 . b) 2 = 1 /N . c) 2 = 1 . d) 2 = 2 1 . e) 2 = 0. 013 qmult 00600 1 1 3 easy memory: indeterminate equilibrium cases 6. In a planar or 2-dimensional case of static equilibrium with no special rules relating forces, can
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