Astronomers use the right ascension of an object as one part of its position on the celestial sphere. The right ascension can be compared to these direction lines on the Earth:
A. latitude.
B. longitude.
C. meridian.
D. declination.
longitude.
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Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m
A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s. A) 562 Hz B) 278 Hz C) 452 Hz D) 694 Hz E) 422 Hz
Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A) nuclear fusion and nuclear fission B) nuclear fusion and supernovae C) nuclear fission and supernovae D) nuclear fusion and gravitational contraction
The position of an object is given by 
where t is in seconds. At t = 2.0 s, what is the magnitude of the particle's acceleration?
A. 0 m/s2 B. 2.0 m/s2 C. 17 m/s2 D. 36 m/s2 E. 72 m/s2
A student adds two displacement vectors that have the magnitudes of 14.0 m and 6.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?