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Unformatted text preview: Abd Elhai, Mohamed – Homework 8 – Due: Apr 7 2008, 9:00 pm – Inst: Dr Kevin Dean 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This is ONLINE HOMEWORK No. 8 (HW19-OH08). It is due by 06:00 AM Abu Dhabi Time on Tuesday 8 April (9:00 PM Monday 7 April, Texas time). 001 (part 1 of 1) 10 points A 8 kg steel ball strikes a wall with a speed of 12 . 1 m / s at an angle of 49 ◦ with the normal to the wall. It bounces off with the same speed and angle, as shown in the figure. x y 1 2 . 1 m / s 8 kg 1 2 . 1 m / s 8 kg 49 ◦ 49 ◦ If the ball is in contact with the wall for . 106 s, what is the magnitude of the average force exerted on the ball by the wall? Answer in units of N. 002 (part 1 of 3) 4 points The force of magnitude F x acting in the x direction on a 2 . 5 kg particle varies in time as shown in the figure. 1 2 3 4 5 1 2 3 4 F x (N) t (s) Find the impulse of the force. Answer in units of N · s. 003 (part 2 of 3) 3 points Find the final velocity of the particle if it is initially at rest. Answer in units of m / s. 004 (part 3 of 3) 3 points Find the final velocity of the particle if it is initially moving along the x axis with a velocity of- 9 m / s. Answer in units of m / s. 005 (part 1 of 4) 3 points Allison (of mass 40 kg) is coasting in her wagon (of mass 15 kg) at a constant velocity of 6 m / s . She passes her mother, who drops a bag of toys (of mass 2 kg) into the wagon....
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