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Unformatted text preview: mata (jpm2873) HW #5 Antoniewicz (57420) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 5.0 points A 3 . 2 kg block is placed on top of a 11 . 7 kg block. A horizontal force of F = 55 . 9 N is applied to the 11 . 7 kg block, and the 3 . 2 kg block is tied to the wall. The coefficient of kinetic friction between all moving surfaces is 0 . 178. There is friction both between the masses and between the 11 . 7 kg block and the ground. The acceleration of gravity is 9 . 8 m / s 2 . 3 . 2 kg 11 . 7 kg = 0 . 178 = 0 . 178 F T Determine the tension T in the string. Answer in units of N. 002 (part 2 of 2) 5.0 points Determine the magnitude of the acceleration of the 11 . 7 kg block. Answer in units of m / s 2 . 003 (part 1 of 2) 5.0 points A small metal ball is suspended from the ceil- ing by a thread of negligible mass. The ball is then set in motion in a horizontal circle so that the thread describes a cone. The acceleration of gravity is 9 . 8 m / s 2 . v 9 . 8 m / s 2 1 . 4 m 5 . 6 kg 3 1 What is the speed of the ball when it is in circular motion? Answer in units of m / s. 004 (part 2 of 2) 5.0 points How long does it take T period for the ball to rotate once around the axis? Answer in units of s. 005 10.0 points The force required to stretch a spring varies directly with the amount the spring is stretched. A force of 85 pounds is needed to stretch a spring 18 inches, as shown in the...
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- Spring '08