Which technique is best for measuring the distances of nearby galaxies?
What will be an ideal response?
Cepheids
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Stars are born in
a. reflection nebulae. b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble.
Astronomers think most galaxy interactions took place at redshifts of greater than 1 because:
A) stars were bigger. B) galaxies were bigger. C) galaxies were smaller. D) clusters were more diffuse. E) clusters were more compact.
A cubic box with sides of 20 cm contains 2 × 1023 molecules of helium with a root-mean-square (rms) speed of 200 m/s. The mass of a helium molecule is 3.4 × 10-27 kg
What is the average pressure exerted by the molecules on the walls of the container? A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 2.26 kPa E) 9.1 Pa
Consider an AC series circuit containing a coil, capacitor, and resistor. Doubling the frequency will change the capacitive reactance by what factor?
a. 1.41 c. 2.0 b. 1.0 d. 1/2