From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?
A) The star is moving toward us.
B) The star is moving away from us.
C) The star is getting hotter.
D) The star is getting colder.
E) The "star" actually is a planet.
B) The star is moving away from us.
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Car 1 with mass m rounds an unbanked curve of radius R traveling at a constant speed src="https://sciemce.com/media/4/8b3b5fb217c65962020-02-23 21_17_31-ch07_clicker [Compatibility Mode] - Microsoft PowerPoint.png" class="w-image" /> of the sideward static friction force on car 1?
. Car 2 with mass 2m rounds a curve of radius 2R traveling at a constant speed 2
. How does the magnitude 
of the sideward static friction force acting on car 2 compare with the magnitude
A. 
B. 
C. 
D. 
E. 
F. Other (specify)
Is it possible to see a virtual image?
A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B) No, since virtual images do not really exist. C) Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. D) Yes, but only by using an additional lens to form a real image before the light reaches the eye.
Where, other than at infinity, is the electric field 0 in the vicinity of the dipole shown?
1.Along the y-axis.
2.At the origin.
3.At two points, one to the right of (a, 0), the other to the left of (-a, 0).
4.At two points on the y-axis, one below the origin, one above the origin.
5.None of the above.
The function of the glass fibers in fiberglass is to increase the ______________.
Fill in the blank(s) with the appropriate word(s).