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OH-05-problems

# OH-05-problems - mohammed(omm269 OH-05 bradley(19101 This...

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mohammed (omm269) – OH-05 – bradley – (19101) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is Online Homework No. 5 (OH-05). All answers should be submitted online be- fore 2300 on Tuesday 1 March (UAE time). Computers and network connections can give trouble, so do not wait until the last minute! 001(part1of2)10.0points Two blocks are arranged at the ends of a mass- 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 . 381 m, their speed is 1 . 32 m / s. The acceleration of gravity is 9 . 8 m / s 2 . 5 . 1 kg 3 . 7 kg μ What is the coefficient of friction between m 2 and the table? 002(part2of2)10.0points What is the magnitude of the tension in the cord? Answer in units of N. 003(part1of2)10.0points 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 vectora of the block? 1. | vectora | = F cos φ - f m 2. | vectora | = F - f m 3. | vectora | = F cos φ m 4. | vectora | = F m 5. | vectora | = F sin φ - m g m 004(part2of2)10.0points Which of the following expressions for the coefficient of friction is correct?

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OH-05-problems - mohammed(omm269 OH-05 bradley(19101 This...

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