Most of the moons of Saturn have rocky, cratered surfaces, like Deimos and Phobos
Indicate whether the statement is true or false
FALSE
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Hubble's law is not applicable to ________ because the motion of these galaxies is affected by ________.
A. galaxies in the Local Group; gravitational interaction with the Milky Way B. distant galaxies; intervening dust C. spiral galaxies; their spiral arms D. elliptical galaxies; their rotation
If 10 J of work is used in pushing 1 C of charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V. B) 10 V. C) more then 10 V. D) none of the above
If a star has an extrasolar planet, the amplitude of its radial velocity curve is related to the planet's
A) mass B) orbital shape C) orbital period D) radius
A nearsighted person cannot see objects beyond 80 cm from his eyes. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the distant objects clearly?
A) +80 cm, +1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, -1.3 diopters D) -80 cm, -1.3 diopters E) -1.3 cm, +1.3 diopters