What is the difference between energy and power?
A) Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time.
B) Power is measured in joules and energy is measured in watts.
C) Power is used to describe energy of light, whereas the term energy has a broader meaning.
D) There's no difference; energy and power are different names for the same thing.
A) Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time.
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The critical evidence for cosmic acceleration in 1998 came from two teams of astronomers, both observing:
A) hypernovae. B) gamma ray bursts. C) type I supernovae. D) type II supernovae. E) ages of globular clusters.
Centripetal force does no work on a circularly-moving object because
A) no change in energy occurs. B) rotational energy transfers to kinetic energy. C) centripetal force has no component in the direction of motion. D) none of the above.
What types of observations are necessary to determine the motion of a star through space?
What will be an ideal response?
What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 10^6 m around the Earth? (Mass of Earth = 6.0 × 10^24 kg.)
a. 5.0 × 10^9 J b. 1.0 × 10^10 J c. 1.5 × 10^10 J d. 2.0 × 10^10 J e. 2.5 × 10^9 J