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).
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
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