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Unformatted text preview: oldmidterm 02 – KORCZYNSKI, ALLISON – Due: Mar 5 2007, 4:00 am 1 Question 1 part 1 of 1 10 points An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (see figure). The coefficient of static friction between the person and the wall is μ and the radius of the cylinder is R . ω R What is the minimum tangential velocity needed to keep the person from slipping down- ward? 1. v = 1 μ radicalbig g R 2. v = radicalbig 2 μg R 3. v = 2 radicalbig g R 4. v = 2 μ radicalbig g R 5. v = radicalBigg g R μ 6. v = μ radicalbig g R 7. v = 1 2 radicalbig g R 8. v = μ radicalbig 2 g R 9. v = μ radicalbig 2 π g R 10. v = radicalbig g R Question 2 part 1 of 1 10 points The following figure shows a Ferris wheel that rotates 5 times each minute and has a diameter of 24 m. The acceleration of gravity is 9 . 8 m / s 2 . What force does the seat exert on a 42 kg rider at the lowest point of the ride? Answer in units of N. Question 3 part 1 of 1 10 points A(n) 30 kg boy rides a roller coaster. The acceleration of gravity is 9 . 8 m / s 2 . With what force does he press against the seat when the car moving at 7 . 6 m / s goes over a crest whose radius of curvature is 15 m? Answer in units of N. Question 4 part 1 of 1 10 points An object attached to the end of a string swings in a vertical circle of radius 2 . 4 m as shown. At an instant when θ = 30 ◦ , the speed of the object is 11 m / s and the tension in the string is 48 N. The acceleration of gravity is 9 . 8 m / s 2 . 1 1 m / s 4 8 N 2 . 4 m 30 ◦ 9 . 8 m / s 2 What is the mass m of the object? Answer in units of kg. Question 5 part 1 of 1 10 points oldmidterm 02 – KORCZYNSKI, ALLISON – Due: Mar 5 2007, 4:00 am 2 A 9 kg mass moves in a circular path of 4 m radius on a frictionless horizontal table....
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This note was uploaded on 04/15/2010 for the course PHY 12343 taught by Professor Turner during the Spring '10 term at University of Texas at Austin.
- Spring '10