This image shows the velocity of gas moving toward or away from us on the Sun's surface, as measured through Doppler shifts; the key indicates the measured velocity, with negative velocities indicating gas moving toward us and positive velocities away from us. Based on this map, about how fast is the sun rotating at its equator? (Hint: determine the speed at which equatorial gas is moving toward us on one side of the equator and away from us on the other.)
A) about 200 m/s
B) about 2000 m/s
C) about 20,000 m/s
D) The Sun is not rotating.
B) about 2000 m/s
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Which of the following is not a consequence of the high thickness and peculiar composition of Venus's atmosphere?
a. We cannot see down to its surface in visible light. b. Its surface is very smooth. c. Venus looks highly reflective. d. The surface pressure is 100 times higher than on Earth's surface.
Which statement best describes the smaller moons of Uranus?
a. bright, spherical bodies b. bright, highly grooved surfaces c. dark, icy worlds d. dark, rocky worlds e. dark, highly active worlds
A metal wire has a resistance of 14.00 ? at a temperature of 25.0°C. If the same wire has a resistance of 14.55 ? at 90.0°C, what is the resistance when its temperature is ?32.0°C?
a. 2.21 ? b. 13.5 ? c. 5.13 ? d. 39.2 ? e. 13.0 ?
In the Doppler effect for electromagnetic waves, which of the following gives the greatest shift in frequency?
a. the source moving toward the non-moving observer at speed v b. the observer moving toward the non-moving source at speed v c. the source moving toward the approaching observer, both at speed v /2 d. All of the above give the same shift.