What is the ecliptic?
A. the extension of Earth's path on the celestial sphere
B. the line of the solar and lunar eclipses on the celestial sphere
C. the elliptical shape of Earth's orbit around the Sun
D. All of these choices are correct.
Answer: A
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The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
Indicate whether the statement is true or false
The cosmological principle states that the Universe is I. expanding. II. accelerating. III. homogeneous. IV. isotropic
a. I and II b. III and IV c. I and III d. II and IV e. I, II, III, and IV
When observing a star that increases dramatically in brightness, if a plateau is observed in the light curve during the declining phase, the event is probably:
A) a nova. B) a type I supernova. C) a type II supernova. D) fusion in an accretion disk around a white dwarf. E) fusion in an accretion disk around a neutron star.
A object on a spring undergoes SHM. When the object passes through the equilibrium position, which of the following statements about object-spring system are true? (There could be more than one correct choice.)
A) Its acceleration is zero. B) Its speed is zero. C) Its elastic potential energy is zero. D) Its kinetic energy is a maximum. E) Its total mechanical energy is zero.