Which statement is correct?
A. No systems of multiple exoplanets have been detected.
B. No gas giants have been detected orbiting closer than 1 au to their stars.
C. No exoplanets have been detected orbiting closer than 1 au to their stars.
D. No exoplanets have been detected orbiting binary stars.
E. None of these choices are correct.
Answer: E
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Why don't we see the constellation Orion all year?
a) As the Earth orbits the Sun, its nighttime side points to different constellationsat different points along its orbit. b) It is frequently eclipsed by the Moon. c) When we are close to Orion it appears bright, but when we are far away it gets toofaint to see. d) Half the year it is visible in North America, and the other half in SouthAmerica. e) It is not along the Ecliptic path and only the constellations of the Zodiac are visibleall year round.
Answer the following statement(s) true (T) or false (F)
1. If we choose our origin to be the hinge in the situation discussed in problem N4T.4, the torque exerted by the lid’s weight around the hinge is away from the viewer.
Two projectiles are launched 50° above horizontal but with different initial speeds. Which of the following must be true while the projectiles are in the air? (Ignore air resistance.)
A. The horizontal speeds of both projectiles are the same B. The one with larger initial speed will experience a larger vertical acceleration C. The projectiles will reach the same maximum height D. The horizontal accelerations of both projectiles are the same: zero
If the image formed by a concave mirror is closer to the mirror than the object is, then, compared to the object, the image will be
A. smaller and inverted. B. larger and erect. C. larger and real. D. larger and inverted.