A water pipe with inner radius r1 is connected to a junction with two equal-diameter pipes. Water flows through each of the two pipes with a speed of v. If the diameter of each of the two pipes is ΒΌ the diameter of the single pipe, what is the flow rate in the single pipe?
a. v/8
b. v/4
c. 4v
d. 8v
a
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In what way do observations of binary star systems support the special theory of relativity?
A) Stars in binary systems often orbit at speeds close to the speed of light, allowing us to check whether time dilation really occurs. B) Stars in binary systems are moving, so we can compare their moving masses to their rest masses. C) The fact that the stars appear distinct supports the idea that the speed of light is unaffected by the motion of the stars. D) Binary systems have two stars, and therefore give us twice the opportunity to test the theory than single star systems.
The expression used for momentum, p=mv,
A. Is a good low-velocity approximation B. Is a good high-velocity approximation C. Is correct as long as we properly understand v D. Always gives too high a value for p
The effects of scaling are beneficial to small creatures
A) that get wet. B) that fall from great heights. C) who are hungry. D) all of the above E) none of the above
Which of the following is a consequence of the laws of thermodynamics?
A.Heat can be completely changed into work B.Heat transfers from a cold object to a hot object until equilibrium is reached
C.Atoms can be at any temperature, even absolute zero D.Work can be completely changed into heat