A pipe of diameter 4 cm is replaced by one of the same length but of diameter 5 cm. If the pressure difference between the ends of the pipe remains the same, by what factor is the rate of flow of a viscous liquid through it changed?
a. 5.1
c. 2.4
b. 3.4
d. 1.5
C
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Refer to the diagram of Racetrack X. 
Refer to the diagram of Racetrack X. It is ________ for a racer to have uniform acceleration ________ on this track.
A. possible; everywhere B. guaranteed; at some places C. impossible; anywhere D. impossible; at some places
No optical traces have been found of the gamma-ray bursters
Indicate whether the statement is true or false
If the carbon dioxide in Earth's rocks were suddenly released into its atmosphere, what would happen?
a. It would rapidly escape into space. b. It would dissociate into carbon and oxygen. c. It would collect as ice on the north and south poles. d. It would cause a runaway greenhouse effect.
The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A) 25 Hz B) 50 Hz C) 100 Hz D) 200 Hz