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Unformatted text preview: soto (rrs946) Homework 6 Spurlock (41003) 1 This print-out should have 78 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 50 m / s and a second 1200 kg car moving west at 105 m / s? Let east be the positive direction. Answer in units of kg m / s. 002 (part 1 of 2) 10.0 points A 998 kg drag race car accelerates from rest to 117 km / h in 0 . 955 s. What change in momentum does the force produce? Answer in units of kg m / s. 003 (part 2 of 2) 10.0 points What average force is exerted on the car? Answer in units of N. 004 10.0 points A 3 kg steel ball strikes a wall with a speed of 5 . 06 m / s at an angle of 57 . 3 with the normal to the wall. It bounces off with the same speed and angle, as shown in the figure. x y 5 . 6 m / s 3 kg 5 . 6 m / s 3 kg 57 . 3 57 . 3 If the ball is in contact with the wall for . 247 s, what is the magnitude of the average force exerted on the ball by the wall? Answer in units of N. 005 (part 1 of 2) 10.0 points A(n) 11800 lb railroad car traveling at 6 . 7 ft / s couples with a stationary car of 6000 lb. The acceleration of gravity is 32 ft / s 2 . What is their velocity after the collision? Answer in units of ft / s. 006 (part 2 of 2) 10.0 points What impulse did the first car receive? Answer in units of lb s. 007 10.0 points A uranium nucleus 238 U may stay in one piece for billions of years, but sooner or later it de- cays into an particle of mass 6 . 64 10 27 kg and 234 Th nucleus of mass 3 . 88 10 25 kg, and the decay process itself is extremely fast (it takes about 10 20 s). Suppose the uranium nucleus was at rest just before the decay. If the particle is emitted at a speed of 1 . 71 10 7 m / s, what would be the recoil speed of the thorium nucleus? Answer in units of m / s. 008 (part 1 of 2) 10.0 points A small block of mass 64 g is released from rest at the top of a curved frictionless wedge of mass 277 g which sits on a frictionless horizontal surface as shown. The acceleration due to gravity is 9 . 81 m / s 2 . Right is the positive direction. 64 g 277 g h When the block leaves the wedge, its veloc- ity is 4 . 34 m / s to the right. soto (rrs946) Homework 6 Spurlock (41003) 2 64 g 4 . 34 m / s 277 g v b What is the velocity v b of the wedge after the block reaches the horizontal surface? Answer in units of m / s. 009 (part 2 of 2) 10.0 points What is the height h of the wedge? Answer in units of m. 010 10.0 points A 3 . 74 kg mass with an initial velocity of v 1 = a i , where a = 2 . 81 m / s collides with and sticks to a 1 . 88 kg mass with an initial velocity of v 1 = b j , where b =- 4 . 8 m / s....
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