What type of galaxy has only old stars, little dust, low density, hot gas, and no star formation?
A. irregular galaxies
B. elliptical galaxies
C. spiral galaxies
D. All types of galaxies share these features
Answer: B
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Which of the following statements about electromagnetic waves in free space are true?
A. The higher-frequency travel faster than the lower-frequency waves. B. The higher-frequency waves have shorter wavelengths than the lower-frequency waves. C. The wavelengths of the visible waves are some of the longest electromagnetic waves. D. The wavelengths of the visible waves are some of the shortest electromagnetic waves. E. The electric field vector is always at right angles to the magnetic field vector.
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 sin (?t + ?/3). The velocity (in m/s) of the body at t = 1.0 s is
A. +7.9. B. ?7.9. C. ?14. D. +14. E. ?5.0.
For normal vision, an object can be seen clearly when it is beyond the ______________
Fill in the blank(s) with correct word
A long nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its column. Determine the magnitude of the electric field 5.0 cm from the axis of the cylinder
a. 25 N/C b. 20 N/C c. 14 N/C d. 31 N/C e. 34 N/C