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Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
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Assign
Current Score:
16 out of 16
Due:
Monday, October 20, 2008 09:00 AM EDT
Description
Thermal energy; power; open and closed systems.
Instructions
Reading: Sections 6.46.7 and previous sections
Because Problem 6 is complex, in this assignment you may submit each question part (answer
box) separately. You are allowed 3 submissions for a numerical question part or a multiple
select question part, but only 2 for a multiple choice question part.
The due date for this assignment is past.
Your work can be viewed below, but no changes
can be made.
1. [MI2 06.X.07.01]
1/1 points
A certain motor is capable of doing
4500
joules of work in
7
seconds. What is the power output
of this motor?
Power =
643
643
watts
Solution or Explanation
Power =
= watts
2. [MI2 06.P.48]
2/2 points
(a) If you follow a diet of
1940
food calories per day (
1940
kilocalories), what is your average
power consumption in watts? (A food or "large" calorie is a unit of energy equal to 4.2
10
3
J;
a regular or "small" calorie is equal to 4.2 J.) Note for comparison that the power consumption
in a table lamp is typically about 100 watts.
94.3
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This note was uploaded on 04/19/2010 for the course PHYS 2212 taught by Professor Kindermann during the Spring '09 term at Georgia Institute of Technology.
 Spring '09
 Kindermann
 Current, Energy, Power, Work, Thermal Energy

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