Ch1 HW3 2008 (Homework)
Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
Web
Assign
Current Score:
26 out of 26
Due:
Wednesday, August 27, 2008 09:00 AM EDT
Description
Relativistic and nonrelativistic momentum; Change in Momentum. Reading : 1.82.2
Instructions
Answer all questions carefully before submitting the assignment, then correct any errors that
are reported.
The due date for this assignment is past.
Your work can be viewed below, but no changes
can be made.
1. [MI2 01.X.42]
1/1 points
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
66
kg and who is running at a speed of 10 m/s?
=
660
660
kg
·
m/s
Solution or Explanation
For speeds small compared to
c
, momentum is approximately
mv
.
2. [MI2 01.X.43]
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
95
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.)
=
6.58
6.54
kg
·
m/s
Solution or Explanation
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 Spring '09
 Kindermann
 Current, Force, Mass, Momentum, Work, Special Relativity, Metre per second, Metre

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