Applications to Astronomy: A white dwarf star with a mass equal to that of the sun is about the size of
A. the sun.
B. the earth.
C. a basketball.
D. a proton.
Answer: B
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Scientific Notation: Which of the following numbers is the smallest?
A. 15 × 10-3 B. 0.15 × 100 C. 0.00015 × 103 D. 0.00000015 × 106
A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?
A. 17.7 m/s. B. 17.5 m/s. C. 20.3 m/s. D. 15.4 m/s.
As the number of loops in a current-carrying wire is increased, the
A) more spread out is the magnetic field. B) stronger the enclosed magnetic field. C) weaker the current. D) greater the back emf.
An iceberg is floating in the ocean with 10% of its volume extending above the ocean's surface. What can you say about the iceberg?
A. As it melts, a smaller fraction of its volume will extend above the surface B. Its density is close to but smaller than the density of water C. It displaces only 90% of its weight in water D. Its weight is less than the water it displaces