Define velocity, and give an example
Velocity is the time rate of change of displacement. Ex: a car is traveling north at
60 km/h.
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Double-lobed radio galaxies are____
a. spiral galaxies with unusually luminous nuclei b. elliptical galaxies with very broad emission lines c. explained by the double-exhaust model d. extremely luminous objects with high redshifts e. glowing green gases due to excitation from energy from an active core
Most meteorites collected on Earth are of the rocky primitive variety, although most asteroids are of the carbon-rich variety
Indicate whether the statement is true or false
What is the Sun made of (by mass)?
A) 70% hydrogen, 28% helium, 2% other elements B) 100% hydrogen and helium C) 50% hydrogen, 25% helium, 25% other elements D) 90% dark matter, 10% ordinary matter
In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch
If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment? A) 3.00 × 108 m/s B) 3.00 × 10-8 m/s C) 3.22 × 108 m/s D) 3.22 × 10-8 m/s E) 2.25 × 108 m/s