Which component of Earth's motion causes the stars to rise earlier on successive nights?
What will be an ideal response?
Its orbit around the Sun.
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The radio lobes that are on each side of some radio galaxies and jets from them produce mainly
a. 21-cm radiation. b. synchrotron radiation. c. black body radiation. d. emission lies due to hydrogen. e. absorption lines due to hydrogen.
An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east
How fast was the boy moving just before the collision?
As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz. After the car goes by, you hear a frequency of 60.0 Hz
What is the speed of the car? The speed of sound in the air is 343 m/s. A) 64.0 m/s B) 49.0 m/s C) 16.0 m/s D) 36.0 m/s E) 25.0 m/s
Neptune may have more atmospheric activity than Uranus because it:
A) lacks an inclined magnetic field. B) contains 1.5 times less methane. C) has minimal cloud formations. D) has more heat flowing out of its interior.