Which of these observations helped test the idea that Mars' atmosphere thinned due to interactions with the solar wind?
A) The MAVEN orbiter measured present-day gas loss from Mars' atmosphere.
B) The Curiosity rover measured the carbon content of rocks on Mars' surface.
C) Astronomers used spectrographs on the Keck telescope to measure the density of Mars' atmosphere.
D) Geologists measured the carbon content of Martian rocks that were transported to Earth by asteroid impacts.
A) The MAVEN orbiter measured present-day gas loss from Mars' atmosphere.
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Which of the following best defines animated GIFs?
A. A static image that one downloads from a developer for use in websites. B. A feature-length movie in web format. C. A single file that stores separate images within multiple animation frames. D. A series of files stored in a folder that create a short animation or movie.
If you exert 100 J to lift a box in 50 s your power output is
A) 1/4 W. B) 1/2 W. C) 2 W. D) 4 W. E) more than 4 W.
Two very long parallel wires are a distance d apart and carry equal currents in opposite directions. The locations where the net magnetic field due to these currents is equal to zero are
A) midway between the wires. B) a distance d/2 to the left of the left wire and also a distance d/2 to the right of the right wire. C) a distance d to the left of the left wire and also a distance d to the right of the right wire. D) a distance d/ to the left of the left wire and also a distance d/ to the right of the right wire. E) The net field is not zero anywhere.
An object's weight is properly expressed in units of
A) meters. B) kilograms. C) newtons. D) cubic centimeters.