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Unformatted text preview: soto (rrs946) Homework 4 Spurlock (41003) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A hawk flies in a horizontal arc of radius 15 . 2 m at a constant speed of 1 . 6 m / s. Find its centripetal acceleration. Answer in units of m / s 2 . 002 (part 2 of 2) 10.0 points It continues to fly along the same horizon- tal arc but increases its speed at the rate of . 96 m / s 2 . Find the magnitude of acceleration under these new conditions. Answer in units of m / s 2 . 003 10.0 points A space station in the form of a large wheel, 334 m in diameter, rotates to provide an ar- tificial gravity of 5 . 2 m / s 2 for people located on the outer rim. Find the rotational frequency of the wheel that will produce this effect. Answer in units of rpm. 004 10.0 points A car is moving at 21 m / s along a curve on a horizontal plane with radius of curvature 56 m . The acceleration of gravity is 9 . 8 . What is the required minimum coefficient of static friction between the road and the cars tires to keep the car from skidding? 005 10.0 points Mars has a mass of about 6 . 72 10 23 kg, and its moon Phobos has a mass of about 9 . 1 10 15 kg. If the magnitude of the gravitational force between the two bodies is 4 . 52 10 15 N, how far apart are Mars and Phobos? The value of the universal gravitational constant is 6 . 673 10 11 N m 2 / kg 2 . Answer in units of m. 006 10.0 points A bucket full of water is rotated in a verti- cal circle of radius 1 . 134 m (the approximate length of a persons arm). What must be the minimum speed of the pail at the top of the circle if no water is to spill out? Answer in units of m / s. 007 10.0 points A car with mass 882 kg passes over a bump in a road that follows the arc of a circle of radius 59 . 5 m as shown in the figure....
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This note was uploaded on 11/10/2011 for the course PHYSICS 303L taught by Professor Hoffman during the Fall '11 term at University of Texas at Austin.
- Fall '11