A pipe of diameter three cm is replaced by one of the same length but of diameter six 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. 2
b. 4
c. 8
d. 16
e. 32
d
Physics & Space Science
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Jupiter does not have
a. a hot interior. b. convection occurring in its atmosphere. c. crustal plates on its surface. d. a dynamo effect. e. any rings.
Physics & Space Science
An object accelerates when it slows or its direction of movement changes
a. true b. false
Physics & Space Science
Most pulsars have a measured mass of:
A) about 1.4 solar masses. B) less than 1.0 solar masses. C) between 2 and 4 solar masses. D) 5.2 solar masses. E) greater than 10 solar masses.
Physics & Space Science
Einstein believed that the principle of relativity should apply to Maxwell's theory of electromagnetism. Which basic principle or law did this lead Einstein to propose?
A) length contraction B) the law of inertia C) the constancy of lightspeed D) the relativity of time E) E=mc2
Physics & Space Science