What did Millikan measure in his oil-drop experiment?
A) the electric charge of an electron
B) the mass of an electron
C) the mass of oil drops
D) none of the above
Answer: A
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The mass of the Milky Way galaxy is a few ____
a. million solar masses b. hundreds of millions of solar masses c. billion solar masses d. hundreds of billions of solar masses e. trillion solar masses
Thermal Expansion: A large vat contains 1.000 L of water at 20°C. What volume will this water occupy when it is heated up to 80°C? Water has a volume expansion coefficient of 210 × 10-6 K-1.
A. 1.600 L B. 1.013 L C. 0.987 L D. 0.9987 L
Which of the following sequences correctly describes the stages of life (from beginning to end) for a low-mass star?
A) red giant, protostar, main-sequence, white dwarf B) protostar, main-sequence, red giant, white dwarf C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, white dwarf, red giant E) protostar, red giant, main-sequence, white dwarf
An auto moves 10 meters in the first second of travel, 15 more meters in the next second, and 20 more meters during the third second. The acceleration of the auto is
A. 5 m/s2. B. zero m/s2. C. 9.8 m/s2. D. 3.33 m/s2. E. 30 m/s2.