what is the Saros cycle
a) the period between total solar eclipses
b)the period between a total solar eclipse and a total lunar eclipse
c) the 18-year cycle over which the pattern of eclipses repeats
c) the 18-year cycle over which the pattern of eclipses repeats
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The explosion of a supernova typically leaves behind
a. a planetary nebula. b. a shell of hot, expanding gas with a white dwarf at the center. c. a shell of hot, expanding gas with a pulsar at the center. d. nothing is ever left behind.
Plane Mirrors: A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?
A. 43° B. 86° C. 45° D. 90° E. 0°
Can an object's velocity change direction when its acceleration is constant?
A) Yes, this is possible, and a rock thrown straight up is an example. B) No, this is not possible because it is always speeding up. C) No, this is not possible because it is always slowing up. D) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. E) No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.
Quadrupling the power output from a speaker emitting a single frequency will result in what increase in loudness?
a. 17 dB b. 7.0 dB c. 6.0 dB d. 1.4 dB e. 0.48 dB