A steel stack of 4 m diameter is 60 m high and is used to exhaust gases that are at an average temperature of 600ºC. The stack wall temperature is 1000 when the surrounding air temperature is 20ºC. Estimate the stack gas velocity.
What will be an ideal response?
The velocity due to the chimney effect, or stack effect, assuming ideal gases in the
stack, using properties of air for these gases is
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Randomly polarized light of intensity I0 is passed through two polarizers whose transmission axes differ by 45
What is the intensity of the light that has passed through both polarizers?
a. 
b. 
c. 
d. 
E. 0.00
If a floating log is seen to bob up and down 15 times in 1.0 min as waves pass by you, what are the frequency and period of the oscillation?
What will be an ideal response?
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Answer the following statement true (T) or false (F)
Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters. B) the expansion of the universe. C) old, red stars in distant galaxies. D) supermassive black holes.