The Kepler mission discovered thousands of stars by using
A) the transit method.
B) the Doppler method.
C) the astrometric method.
D) direct detection.
E) gravitational lensing.
A) the transit method.
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An object of mass m is hanging by a string from the roof of an elevator. The elevator is slowing down. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator
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
What is the primary way in which we determine the mass distribution of a spiral galaxy?
A) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center. B) We calculate its mass-to-light ratio. C) We apply Newton's version of Kepler's third law to the orbits of globular clusters in the galaxy's halo. D) We count the number of stars we can see at different distances from the galaxy's center.
The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?
A) It can do work more quickly B) It can operate for a longer time. C) It can burn fuel more efficiently. D) It can store more potential energy.