The specific gravity of an unknown liquid is known to be 1.26. The liquid is most likely:
(A) Glycerin
(B) Carbon tetrachloride
(C) Mercury
(D) Water
(A) Glycerin
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Uranium-238 decays into lead-206 with a half-life of 4.5 billion years. Suppose you found a rock in which only 1/4 of the original uranium-238 remained (the other ¾ having become lead-206). How old would the rock be?
A) 9 billion years B) 4.5 billion years C) 2.25 billion years D) 13.5 billion years
What is hot dark matter?
A) a type of electron that moves more rapidly than ordinary electrons do. B) hypothetical heavy fundamental particles that interact with baryons only through gravity and the weak force. C) hypothetical low mass particles that travel close to the speed of light but do not emit radiation. D) a type of proton that moves more rapidly than ordinary protons do. E) a type of neutron that moves more rapidly than ordinary neutrons do.
According to Copernicus, the retrograde motion for Mars must occur
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
From Earth, one satellite appears to overtake another. The faster satellite that is seen to overtake the other is
A) higher. B) lower. C) can't say