An airplane increases its speed at the average rate of 15 m/s2. How much time does it take to increase its speed from 100 m/s to 160 m/s?
A) 17 s
B) 0.058 s
C) 4.0 s
D) 0.25 s
C
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If the resistance in a circuit using an ideal (no internal resistance) battery is increased, then
A. the voltage difference maintained by the battery does not change. B. the current coming out of the battery does not change. C. the power output of the battery does not change. D. All of these choices are correct
Poor clusters
a. contain more than 1000 stars and are found in the halo of the galaxy. b. contain lots of young stars and are found in the disk of a spiral galaxy. c. contain more than 1000 galaxies and are generally elliptical in shape. d. contain fewer than 1000 galaxies and tend to be irregularly shaped. e. are found in the nucleus of the galaxy.
These diagrams represent four possible models for the universe. Each model shows how the size of the observable universe changes with time. Of the four models, which one gives the universe the oldest age at present?
A) accelerating universe B) coasting universe C) critical universe D) recollapsing universe E) The age of the universe would be the same no matter which model is correct.
Two isotopes have the same
a. mass number. b. neutron number. c. atomic number. d. quantum number. e. none of the above