As water in a confined pipe speeds up, the pressure it exerts against the inner walls of the pipe
A) increases.
B) decreases.
C) remains constant if flow rate is constant.
D) none of the above
Answer: B
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The mass density of normal air is, at a particular temperature, 
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
a. 
b. 
c. 
d. 
e. 
f. 
What does Einstein's cosmological constant represent in his equations of general relativity?
A) the value of the expansion rate of the universe B) the value of the acceleration of the universe C) the value that measures the strength of gravity across the universe D) the size of the cosmological horizon E) a repulsive force that can counteract gravity
A sphere hanging freely from a cord is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.
A nutritionist in the United States measures food energy in units of
A) kilocalories. B) Calories. C) both are the same D) neither of the above