Why was it advantageous for the Voyager mission to consist of flybys rather than orbiters?
A) Spacecraft making flybys can return to Earth more quickly than orbiters.
B) Each individual spacecraft was able to visit more than one planet.
C) It was easier for data to be radioed back to Earth with flybys than orbiters.
D) Flyby spacecraft can get closer to a planet than an orbiting spacecraft.
B
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Which of the following methods has been the LEAST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
A student uses a thermometer calibrated in Kelvin units. A temperature change of 20 K is equivalent to a change of how many degrees on the Celsius scale? ________.
Fill in the blank(s) with the appropriate word(s).
A "standing wave" is a wave that
A) vibrates at zero amplitude. B) vibrates and moves from one place to another but whose shape does not change. C) doesn't vibrate. D) a wave that is in the process of reversing its direction of motion. E) vibrates but whose "loops" don't move from one place to another.
A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his lowest point during the ride?
a. 5.7 m/s2 downward b. 4.1 m/s2 upward c. 14 m/s2 downward d. 4.1 m/s2 downward e. 19 m/s2 downward