Why is the claim of fossilized life in the Martian meteorite ALH84001 controversial?
A) it is doubtful that the rock actually came from Mars
B) the proposed fossilized organisms in no way resemble any kind of life found on Earth
C) the rock is too young to have fossilized life within it
D) there are many possible nonbiological explanations for the observed evidence
D
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A truck has four times the mass of a car and is moving with twice the speed of the car. If Kt and Kc refer to the kinetic energies of truck and car respectively, it is correct to say that
A) Kt = 16Kc. B) Kt = 4Kc. C) Kt = 2Kc. D) Kt = Kc. E) Kt = Kc.
Light reflects off the surface of Lake Superior. What phase shift does it undergo?
A) 0° B) 90° C) 180° D) 270° E) It does not undergo any phase shift.
Jupiter's _______________ shows that the planet cannot be as rigid as a Terrestrial planet
Fill in the blank(s) with correct word
Two motors in a factory are running at slightly different rates. One runs at 825 rpm and the other at 786 rpm. You hear the sound intensity increase and then decrease periodically due to wave interference
How much time elapses between successive maxima of the sound intensity? A) 1.5 s B) 1.4 s C) 1.7 s D) 1.8 s