A sinusoidal wave of wavelength ? travels along a stretched string. Then the string is brought to rest and a second simultaneous wave of wavelength 2? is established on the string. The wave speed of the second wave is
1. twice that of the first.
2. half that of the first.
3. ?2 times that of the first.
4. same as that of the first.
4
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According to the text, an orbiting object having energy E < 0 follows an elliptical orbit. When we specify the numerical value for an object’s energy, we are implicitly comparing it to the energy the object has in some reference situation. So, when we say that E < 0 in this case, we are comparing the energy of the orbiting object to the energy of an object with the same mass that is
A. At rest at the primary’s center. B. At rest on the primary’s surface. C. In a circular orbit just above the primary’s surface. D. At rest at r = ?. E. Some other situation (specify).
Why is the angular resolution of radio telescopes much worse than that of smaller optical telescopes?
What will be an ideal response?
A satellite orbits the earth a distance of 1.50 × 107 m above the planet's surface and takes 8.65 hours for each revolution about the earth. The earth's radius is 6.38 × 106 m. The acceleration of this satellite is closest to
A) 0.870 m/s2. B) 0.0690 m/s2. C) 9.80 m/s2. D) 2.72 m/s2. E) 1.91 m/s2.
The fact that one side of the Moon always faces Earth is evidence that while revolving about the Earth it
A) does not rotate about its axis. B) rotates about its axis.