The Sun is on your meridian, and you have a UT clock that tells you it is midnight in Greenwich. What is your longitude?
A) 12° west of Greenwich
B) 12° east of Greenwich
C) 60° west of Greenwich
D) 60° east of Greenwich
E) 180° of longitude from Greenwich
E
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Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
What is the quantity used to measure an object's resistance to changes in rotational motion?
A) mass B) moment of inertia C) torque D) angular velocity E) angular acceleration
What is the composition of the gas clouds (nebulae) we see in space?
a. about half hydrogen and helium, half heavier elements (iron, carbon, silicon, etc.) b. about 98% hydrogen and helium, and 2% heavier elements c. about 2% hydrogen and helium, and 98% heavier elements
Lasers are used to create holograms because
A. they are cool B. they exhibit high coherence C. they are red D. they have lots of energy