Galaxy A is 300 Mpc from Galaxy B. Hubble's Law says that V=H0 x D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A) 75 km/s
B) 15000 km/s
C) 30000 km/s
D) 225 km/s
E) 22500 km/s
Ans: E) 22500 km/s
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Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity. b. Mars’ interior would have been warmer in the past. c. Some meteorites from Mars come from relatively young lava. d. All of the above. e. b and c.
Which of the following patterns in the Milky Way structure is consistent with the idea that the Milky Way has not suffered a major collision with another massive galaxy?
A) The halo is full of old stars orbiting in many different directions. B) Globular clusters are compact groups of thousands of stars. C) The disk is composed of stars of many different ages. D) The disk is composed of stars orbiting in the same plane, same direction.
In the "special theory of relativity," what does the word "special" refer to?
A) This theory is restricted to the study of light beams. B) This theory is restricted to the study of gravitational forces. C) This theory is restricted to the observations of stationary observers. D) This theory is restricted to the observations of accelerated observers. E) This theory is restricted to the observations of non-accelerated observers.
An adiabatic expansion refers to the fact that
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant.