A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?
A) 92 km/h B) 90 km/h C) 85 km/h D) 88 km/h
D
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Galactic fountains are an important way to explain _____
a. the distribution of metals in and above the plane of the galactic disk b. the nature of dark matter c. the formation of the galactic disk from the first stages of our galaxy d. the generation and support of spiral density waves e. why the spiral arms are active sites of star formation
Which physical property in Laplace's nebular hypothesis could not explain the Sun's slow rotation?
a. angular momentum b. angular diameter c. gravitational pull d. radiation pressure e. electromagnetic energy
An airplane flying faster than the speed of sound of 340 m/s produces a shock wave with an angle ?0 = 50°. What is the speed of the plane?
A) 490 m/s B) 530 m/s C) 390 m/s D) 440 m/s E) 405 m/s
Comparing and contrasting the characteristics of planets is known as _____
a. geology b. plate tectonics c. greenhouse effect d. comparative planetology e. Terrestrial planet classification