An eclipsing binary will
a. be more luminous than a visual binary.
b. also be observed as a spectroscopic binary.
c. give off most of its light in the infrared.
d. show a constant Doppler shift in its spectral lines.
e. show two stars with variable proper motion.
b
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Assuming the Moon actually travels in the same plane as the ecliptic, how many total lunar eclipses would occur each year? How many total solar eclipses?
A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 24 N, what is her speed at the bottom?
a. 5.0 m/s c. 11 m/s b. 10 m/s d. She stops before she reaches the bottom.
Which of these are nearly 90 degrees to the orbit plane of Uranus?
a. Uranus' equator b. the orbital planes of its major satellites c. the orbital plane of its rings d. Uranus' equator, the orbital planes of its major satellites, and the orbital plane of its rings.
What is the Great Red Spot?
A) a long-lived, high-pressure storm on Jupiter B) a hurricane that comes and goes on Jupiter C) a place where reddish particles from Io impact Jupiter's surface D) a region on Jupiter where the temperature is so high that the gas glows with red visible light