How do astronomers estimate the approximate age of the Universe?
A. The age of the Universe is equal to 1/H.
B. The age of the Universe is approximately the age of our Sun.
C. The age of the Universe is equal to the Hubble constant (H).
D. They measure the distance to the cosmic horizon and divide by the speed of light.
Answer: A
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Newton's modification of Kepler's Third law allows astronomers to determine the ________ of celestial objects.
A. period B. mass C. acceleration D. distance
A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the speed with which to take the curve without tending to slide either up or down the surface of the road?
A) 9.4 m/s B) 28 m/s C) 780 m/s D) The curve cannot be taken safely at any speed.
The motion of the Sun with respect to the stars is retrograde, i.e., east to west relative to the stars.
Answer the following statement true (T) or false (F)
According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Oxygen released by life was removed from the atmosphere by chemical reactions with surface rocks until the surface rock could absorb no more. B) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. C) Early life did not release oxygen, and oxygen-releasing organisms didn't evolve for a billion years after the earliest life. D) Oxygen released by life was removed from the atmosphere by dissolving in the ocean until the oceans could dissolve no more.