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PHYS172-SP11-HW02

# PHYS172-SP11-HW02 - PHYS172-SP11-HW02...

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Web Assign PHYS172-SP11-HW02 (Homework) Edward Tackjewn Lee PHYS 172-SPRING 2011, Spring 2011 Instructor: Virendra Saxena Current Score : 9 / 26 Due : Tuesday, January 18, 2011 11:59 PM EST 1. 1/1 points Question: MI2 01.X.42 A good sprinter can run 100 meters in 10 seconds (a speed of 10 m/s). What is the magnitude of the momentum of a sprinter whose mass is 63 kg and who is running at a speed of 10 m/s? = 630 630 kg·m/s Solution or Explanation For speeds small compared to c , momentum is approximately mv . 2. 1/1 points Question: MI2 01.X.43 A baseball has a mass of about 155 g. What is the magnitude of the momentum of a baseball thrown at a speed of 93 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.) = 6.41 6.41 kg·m/s Solution or Explanation For speeds small compared to c , momentum is approximately mv . Mass is 0.155 kg. Speed is ( 93 mi/hr)*(1600 m/mi)*(1 hr/(3600 s)). The due date for this assignment is past. Your work can be viewed below, but no changes can be made. PHYS172-SP11-HW02 http://www.webassign.net/[email protected]/student.pl?p=2011... 1 of 5 2/9/2011 4:55 PM

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3. 0/6 points Question: MI2 01.X.46.02 An electron travels at speed | | = 0.997 c , where c =3e8 m/s is the speed of light. It travels in the
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PHYS172-SP11-HW02 - PHYS172-SP11-HW02...

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