HW05-solutions - burgin (lcb626) – WH05 – markert –...

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Unformatted text preview: burgin (lcb626) – WH05 – markert – (56480) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A force F is exerted by a broom handle on the head of the broom, which has a mass m . The handle is at an angle θ to the horizontal, as shown below. F θ What is the work done by the force on the head of the broom as it moves a distance d across a horizontal floor? 1. W = F m tan θ 2. W = F md sin θ 3. W = F d sin θ 4. W = F d cos θ correct 5. W = F m cos θ Explanation: By definition, the work done by a force is given by the formula W = vector F · vector d = F d cos θ, where vector d is the displacement vector, and θ is the angle between vector F and vector d . Simply apply the definition, the work is W = F d cos θ . 002 10.0 points A cart loaded with bricks has a total mass of 12 . 5 kg and is pulled at constant speed by a rope. The rope is inclined at 20 . 6 ◦ de- grees above the horizontal and the cart moves 11 . 6 m on a horizontal floor. The coefficient6 m on a horizontal floor....
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This note was uploaded on 10/25/2010 for the course PHY PHYSICS taught by Professor Swinney during the Fall '08 term at University of Texas at Austin.

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HW05-solutions - burgin (lcb626) – WH05 – markert –...

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