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# ch 1 hw 3 - Ch1 HW3 f10 Page 1 of 6 WebAssign Ch1 HW3...

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Web Assign Ch1 HW3 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 24 / 26 Due : Sunday, September 5, 2010 11:30 PM CDT 1. 2/2 points Question: MI3 1.7.X.035 Powerful sports cars can go from zero to 25 m/s (about 60 mph) in 6 seconds. What is the magnitude of the acceleration, including units? 4.167 4.17 m/s/s m/s/s How does this compare with the acceleration of a falling rock? 2. 1/1 points A baseball has a mass of about 155 g. What is the magnitude of the momentum of a baseball thrown at a speed of 96 miles per hour? (Note that you need to convert mass to kilograms and speed to meters/second. A mile is 1.6 kilometers or 1600 meters.) | | = 6.613 6.61 kg·m/s Solution or Explanation For speeds small compared to c , momentum is approximately mv . Mass is 0.155 kg. Speed is ( 96 mi/hr)*(1600 m/mi)*(1 hr/(3600 s)). 3. 6/6 points 4. 6/8 points 5. 2/2 points 6. 2/2 points Question: MI3 1.9.X.043 7. 5/5 points A tennis ball of mass 57 g travels with velocity < 68 , 0, 0 > m/s toward a wall. After bouncing off the wall, the tennis ball is observed to be traveling with velocity < -64 , 0, 0 > m/s. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. It is less.

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ch 1 hw 3 - Ch1 HW3 f10 Page 1 of 6 WebAssign Ch1 HW3...

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