This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: soto (rrs946) – Homework 6 – Spurlock – (41003) 1 This printout should have 78 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the momentum of a twoparticle 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 α 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 α 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 ˆ 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 ˆ j , where b = 4 . 8 m / s....
View
Full
Document
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.
 Fall '11
 HOFFMAN
 Momentum, Work

Click to edit the document details