A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 4.00 s of acceleration? (Hint: First convert the speed to m/s.)
a. 27.8 m/s
b. 41.7 m/s
c. 20.9 m/s
d. 13.9 m/s
e. 6.95 m/s
d
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Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther b. globular clusters and the Andromeda Galaxy, but not more distant objects c. galaxies that are within 30 megaparsecs, a relatively short distance d. galaxies that are moderately far away, up to about 500 megaparsecs e. galaxies and galactic clusters within a gigaparsec of the Milky Way
Photoelectric Effect: A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light, which of the following statements are correct? (There could be more than one correct choice.)
A. The kinetic energy of the ejected electrons doubles. B. The speed of the ejected electrons doubles. C. The number of electrons ejected per second doubles. D. Twice as many photons hit the metal surface as before. E. None of these things occur.
Consider the circuit below. Switch S is closed at t = 0
What is the voltage across the capacitor
C long after the switch is closed?
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 27 c. 36 d. 40 e. 80