Which one of the following is FALSE?
a) Irregular galaxies, although small, often have lots of star formation taking place in them.
b) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature.
c) Galaxy collisions destroy most of the stars in the galaxies involved.
d) Most galaxies appear to be receding from the Milky Way Galaxy.
e) Most elliptical galaxies contain only old stars.
Ans: c) Galaxy collisions destroy most of the stars in the galaxies involved.
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Fluid Flow: A pump uses a piston of 15 cm diameter that moves at 2.0 cm/s as it pushes a fluid through a pipe. What is the speed of the fluid when it enters a portion of the pipe that is 3.0 mm in diameter? Treat the fluid as ideal and incompressible.
A. 50 m/s B. 50 cm/s C. 6.0 cm/s D. 22 cm/s
Energy in the Electric Field: Each plate of a parallel-plate air-filled capacitor has an area of 0.0040 m2, and the separation of the plates is 0.020 mm. An electric field of 8.2 × 106 N/C is present between the plates. What is the energy density in the region between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 300 J/m3 B. 200 J/m3 C. 400 J/m3 D. 500 J/m3 E. 610 J/m3
If the sequence of the values of sin2 ? for the diffraction peaks of a cubic crystal are 3, 4, 8, 11, 12, 16, 19, then the crystal is _________ cubic.
Fill in the blank(s) with the appropriate word(s).
The darker-colored bands in Jupiter's atmosphere are ________.
A. moving downward B. lower in altitude than the lighter-colored bands C. transparent, relative to the lighter-colored bands D. warmer than the lighter-colored bands E. All of these choices are correct.