A spherical region that surrounds the Solar System and extends up to about 100,000 AU from the Sun is called the
A. Solar nebula.
B. Kuiper belt.
C. Asteroid belt.
D. Oort cloud.
Answer: D
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Compressed air from a tank blows on a windmill. The windmill is connected to a generator that produces electrical energy. Part of that electrical energy is used to compress more air into the tank.
A. first kind B. second kind
In straight-line motion, if a moving object speeds up, the direction of the acceleration is ______________ the direction of the velocity
Fill in the blank(s) with correct word
The Ptolemaic model of the universe was heliocentric
Indicate whether the statement is true or false
What is proper motion?
A) It is the true, not apparent, motion of a star in space. B) It is the apparent shift as we go to opposite sides of our orbit every six months. C) It is the annual apparent motion of a star across the sky. D) It is the motion of a star towards or away from us, revealed by Doppler shifts. E) It is the orbital motion of a star around the Galaxy.