The figure shows a graph of the velocity as a function of time for a basketball player traveling up and down the court in a straight-line path. For the 10 s shown on the graph, find (a) the net displacement of the player. (b) the total distance run by the
What will be an ideal response?
Answer: (a) 18 m (b) 20 m
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The idea of inflation makes one clear prediction that, until the discovery of an accelerating expansion, seemed to contradict the available observations. What is this prediction?
A) Inflation predicts that the early universe should have regions of enhanced density that could have acted as "seeds" for the formation of galaxies and large structures. B) The universe should be geometrically "flat" (in the four dimensions of spacetime). C) Inflation predicts that the temperature of the cosmic microwave background should be almost (but not exactly) the same everywhere. D) Inflation predicts that the entire universe must be far larger than the observable universe.
Which one of the following volumes is largest?
A) 500. cm3 B) liter C) quart D) cc E) cubic inch
In geology, a crystal of a particular chemical composition or structure is referred to as a
A) rock B) fossil C) mineral D) stone
Have objects like Jupiter been found? How?
A. No, only Earth-like planets have been found. B. Yes, cool Jupiters have been found from the microlensing method. C. No, only Mars-like planets have been found. D. Yes, hot Jupiters have been found from the radial velocity method. E. Yes, warm Jupiters have been found from the transit method.