Are you reading the Energy Guide material on the appliances you purchase? Do you look for the Energy Star label? Why or why not? Do you think you should if you don't? Do you think it's helped if you do? Explain your answer
What will be an ideal response?
We do hope that people will do this, and the ubiquity of the labels and the striking
color lends hope that that will happen. Look for some logic in the students' explanations.
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Water has a specific heat capacity of 4186 J/kg 
C? A tank contains 500 kg of water at 10.0
C. If electricity costs $0.100 per kilowatt-hour, then what is the cost of heating the water?
A. $8.75 B. $6.22 C. $4.65 D. $3.79 E. $3.10
Starburst galaxies produce most of their light in the infrared
Indicate whether the statement is true or false
An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when the elastic potential energy of the system object-spring is a maximum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points
Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate
When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10-19 C) A) 7.2 × 10-19 J B) 2.4 × 10-19 J C) 9.6 × 10-19 J D) 4.8 × 10-19 J