The transit method searches for extrasolar planets by
A) monitoring stars for slight dimming that might occur as unseen planets pass in front of them.
B) obtaining high-resolution photographs of other star systems.
C) observing Doppler shifts in a star's spectrum caused by an unseen planet.
D) looking for slight back and forth shifts in a star's position in our sky.
A) monitoring stars for slight dimming that might occur as unseen planets pass in front of them.
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A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)
A) She is subject to a constant non-zero torque. B) Her kinetic energy remains constant. C) Her moment of inertia remains constant. D) Her angular momentum remains constant.
Motion necessarily involves
a. a change in velocity. b. a change in speed. c. a change in direction. d. a change in position. e. all of these
Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has 9 times times the resistivity of the shorter wire. B) The longer wire has 27 times times the resistivity of the shorter wire. C) The longer wire has 3 times the resistivity of the shorter wire. D) Both wires have the same resistivity.
A star with a large parallax:
A) is at a great distance from Earth. B) is moving at a great speed with respect to Earth. C) is at a short distance from Earth. D) is moving at a slow speed with respect to Earth. E) is not moving with respect to Earth.