Why should isotherms and heat flow lines be orthogonal or perpendicular to each other?
What will be an ideal response?
Heat flow occurs because of a temperature difference and isotherms have no
temperature difference. Thus heat cannot flow along isotherms, but must be
perpendicular or orthogonal to isotherms.
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An 8000 kg satellite is launched from the surface of the earth, and injected into outer space a long distance from the earth. The kinetic energy needed to launch the satellite into outer space is 
A. 
B. 
C. 
D. 
E. 
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A) a door-bell B) a humidifier C) a smoke detector D) a food sterilizer
What is the average distance between air molecules at STP?
a. 
b. 
c. 
d. 