What kind of energy does gasoline possess?
A) mechanical
B) kinetic
C) potential
D) radiative
C
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If Vega is apparent magnitude zero, and Deneb first magnitude, then
A) Deneb must be a main sequence star, and Vega a giant. B) Vega must be 2.5× hotter than Deneb. C) Deneb is one magnitude brighter than Vega. D) Vega is about 100× brighter than Deneb. E) Vega is 2.5× brighter than Deneb.
Increasing the amplitude of a mass-and-spring system causes what kind of change in the resonant frequency of the system? (Assume no other changes in the system.)
A) The frequency increases. B) The frequency decreases. C) There is no change in the frequency. D) The frequency depends on the displacement, not the amplitude.
A radioactive material initially is observed to have an activity of 1000 decays/sec. If nine hours later it is observed to have an activity of 125 decays/s, what is its half-life?
a. 1/2 hour c. 3 hours b. 8 hours d. 1 hour
Rocks from the Carboniferous period are significant because they
A) contain diamonds. B) provide gold and silver deposits. C) have large deposits of coal and oil. D) are a source of cement.