Elementary Particles: The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A. uud
B. ddu
C. udd
D. ttb
E. bst
Answer: C
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A uniform solid sphere of mass M and radius R rotates with an angular speed ? about an axis through its center
A uniform solid cylinder of mass M, radius R, and length 2R rotates through an axis running through the central axis of the cylinder. What must be the angular speed of the cylinder so it will have the same rotational kinetic energy as the sphere? A) 2?/5 B) ? C) 4?/5 D) 2?/ E) ?/
Fluid Flow: Water flows out of a large reservoir through an open pipe, as shown in the figure. What is the speed of the water as it comes out of the pipe?
A. 8.9 m/s B. 9.9 m/s C. 13 m/s D. 14 m/s E. 16 m/s
Pulsars are thought to be
A) accreting white dwarfs. B) rapidly rotating neutron stars. C) unstable high-mass stars. D) accreting black holes.
What is the inductive reactance of a 20-mH inductor at a frequency of 60 Hz?
A) 7.5 ? B) 0.13 ? C) 1.2 ? D) 1.2 m? E) 7.5 m?