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Unformatted text preview: Abd Elhai, Mohamed – Homework 5 – Due: Feb 25 2008, 11:00 pm – Inst: Dr Kevin Dean 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This is ONLINE HOMEWORK No 5 It is due 09:00 Tuesday morning, 26 Febru- ary (Abu Dhabi time) - (same as 23:00 Mon- day night in Texas). 001 (part 1 of 2) 5 points Twoblocksarearrangedattheendsofamass- less cord over a frictionless massless pulley as shown in the figure. Assume the system starts from rest. When the masses have moved a dis- tance of 0 . 374 m, their speed is 1 . 27 m / s. The acceleration of gravity is 9 . 8 m / s 2 . 5 . 5 kg 4 . 2 kg μ What is the coefficient of friction between m 2 and the table? 002 (part 2 of 2) 5 points What is the magnitude of the tension in the cord? Answer in units of N. 003 (part 1 of 2) 5 points A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle φ with the horizontal, as shown above. The frictional force on the block exerted by the surface has magnitude f . f F φ m What is the magnitude of the acceleration ~a of the block? 1. | ~a | = F m 2. | ~a | = F cos φ- f m 3. | ~a | = F cos φ m 4. | ~a | = F sin φ- mg m 5. | ~a | = F- f m 004 (part 2 of 2) 5 points Which of the following expressions for the coefficient of friction is correct?coefficient of friction is correct?...
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