Which of these was NOT a part of the original Copernican model?
A) The Sun lies at the center of the solar system.
B) Mercury must move faster in its orbit than any other planet.
C) The Earth rotates on its axis once a day.
D) Venus can go all the way around the Sun.
E) Mercury speeds up at perihelion, and slows down at aphelion.
E
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As stars evolve, their temperature and luminosity change; therefore, their spectral type (OBAF, etc.) changes as well.
Answer the following statement true (T) or false (F)
Two objects, each of weight W, hang vertically by spring scales as shown in the figure. The pulleys and the strings attached to the objects have negligible weight, and there is no appreciable friction in the pulleys. The reading in each scale is
A) W. B) more than W, but not quite twice as much. C) less than W. D) 2W. E) more than 2W.
If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's:
A) transverse motion. B) radial motion. C) parallax shift. D) Doppler shift. E) true space motion.
We construct a closed Gaussian surface in the shape of a spherical balloon. Assume that a small glass bead with total charge Q is in the vicinity of the balloon. Consider the following statements:
A. If the bead is inside the balloon, the electric flux over the balloon's surface can never be 0. B. If the bead is outside the balloon, the electric flux over the balloon surface must be 0. Which of these statements is valid?
1.Only A is valid. 2.Only B is valid. 3.Both A and B are valid. 4.Neither one is valid.