Explain the difference between a star cluster and a stellar association
What will be an ideal response?
A collapsing cloud of gas does not form a single star. Because of instabilities, the cloud breaks into fragments, producing perhaps thousands of stars. A stable group of stars that formed and are held together by their combined gravity is called a star cluster. In contrast, a stellar association is a group of stars that formed together but are not gravitationally bound to one another. The stars in an association drift away from each other in a few million years.
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The addition of Na2O to SiO2 to form soda glass reduces the _____________of SiO2.
Fill in the blank(s) with the appropriate word(s).
Suppose two equipotential surfaces are the planes x = 3 m and x = 5 m. If the potential at the x = 3 m surface is 10 V and the potential at the x = 5 m surface is 50 V, what is the magnitude of the electric field between the two surfaces?
a. 40 N/C c. 15 N/C b. 20 N/C d. 10 N/C
Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b e. none of the above
Three spaceships A, B, and C are in motion, as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.78c
The commander also observes ship A, advancing in the rear, with a relative velocity of 0.31c. What is the velocity of ship C, relative to an observer on ship A? A) 0.88c B) 0.38c C) 1.4c D) 0.62c E) 1.1c