What is the eventual fate of a brown dwarf?
A) It remains the same forever.
B) It gradually cools down and becomes ever dimmer.
C) It gradually contracts and heats up until nuclear fusion ignites in its interior and it becomes a faint star.
D) It becomes ever denser and hotter until it becomes a white dwarf.
E) Gravity ultimately "wins" and it becomes a small black hole.
B
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"Unless you look outside, you cannot tell how fast you are going." This is one way of stating
A) the relativity of space. B) the relativity of time. C) the principle of the constancy of lightspeed. D) Galileo's theory of relativity. E) the principle of relativity.
By what factor should the length of a simple pendulum be changed if the period of vibration were to be increased by a factor of three?
a. 1/32 b. 1/3 c. 3 d. 32 e. 1
Combining a star's proper motion and its distance allows us to determine its transverse velocity
Indicate whether the statement is true or false
Which of the following explains why the stars of Orion's belt rise in the east and set in the west?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.