Suppose you throw a ball vertically downward with a speed of 10 m/s. Neglecting air friction, what would be the speed of the ball one second later?
A. 24.8 m/s
B. 19.8 m/s
C. 9.8 m/s2
D. -9.8 m/s2
E. 15 m/s
Answer: B
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A solid has a solubility at room temperature of 78 grams per liter. If 1.0 L of a hot solution containing 100. g of solute is cooled to room temperature, how much solid is formed?
A) 22 g B) 100 g C) 78 g D) 1 L E) 78g/L
In what way do observations of Mercury support Einstein's general theory of relativity?
A) Mercury's orbit slowly precesses in a way that matches the prediction of general relativity but disagrees with the prediction based on Newton's universal law of gravitation. B) Einstein discovered that time runs slower on Mercury than on Earth, as his theory predicted. C) Einstein was able to explain the fact that Mercury orbits the Sun exactly twice for every three rotations, and Newton's theory of gravity cannot account for this. D) We can see that Mercury lies deeper in the spacetime bowl that surrounds the Sun than does Earth.
_________________ have the highest electrical conductivity at room temperature.
(a) Metals (b) Semiconductors (c) Insulators (d) Superconductors
When strong solar winds are displaced poleward by our magnetic fields, we get:
A) the Van Allen radiation belts. B) intense auroral displays. C) sunspots. D) hurricanes in the tropics. E) droughts and dust bowls in the American West.