Star brightnesses expressed in the magnitude system are known as _____, describing how the stars look to human eyes observing from Earth
A) apparent celestial magnitudes
B) apparent angular magnitudes
C) apparent visual magnitudes
D) apparent rotational magnitudes
C
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If the entire galaxy (with a diameter of 100,000 light years) were represented by a circle with a diameter of 4,400 km (similar to the width of the continental United States), then how far apart would be the Sun and its nearest stellar neighbor,
Proxima Centauri (which is 4.2 light years away)? A) about 0.2 meters (about the length of an adult's forearm) B) about 200 meters (about 2 football fields) C) about 20 meters (about the size of a large classroom) D) about 2 meters (about 2 long footsteps)
The electric force between charges is strongest when the charges are
A) close together. B) far apart. C) either of these
When atoms of two elements with a medium difference in electronegativity bond together, the bonding is probably
a. ionic. b. covalent. c. polar covalent. d. metallic.
Which of the following is not true?
1.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval may not be equal to zero at any time during the interval. 2.The instantaneous velocity of a particle can be less than its average velocity. 3.The instantaneous velocity of a particle can be greater than its average velocity. 4.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval must be equal to zero at some time during the interval.