When the Moon is directly opposite the Sun in the sky, its phase is
A) first or third quarter.
B) waxing or waning gibbous.
C) new.
D) full.
E) waxing or waning crescent.
D
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The water hole is important to SETI because it is a(n) ________ part of the radio spectrum
Fill in the blank(s) with correct word
The graph shows 
versus t for an object moving along straight line. What is the acceleration at t = 11 s?
A. -10 
B. 10
C. 22
D. -22
If the nonzero momentum of a particle with mass is doubled, what happens to its total energy?
a. It also doubles. b. It increases, more than doubling. c. It stays the same since total energy is a constant for a given particle. d. It increases, but less than doubling.
Which of the following is an example of the type of force that acts at a distance?
a. gravitational b. magnetic c. electrical d. all of the above