During the Mesozoic, the supercontinent of Laurasia fragmented into the continents of
A) North America, Europe, and Asia.
B) South America, Africa, Antarctica/Australia, and India/Madagascar.
C) North America, Europe, and Africa.
D) South America, Australia, and Antarctica.
Answer: A
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If the north poles of two bar magnets are brought close to each other, the magnets will
A) attract. B) repel.
Which state of matter is associated with the very highest of temperatures?
a. liquid b. plasma c. gas d. solid
For a certain ideal Carnot engine, the hot reservoir is 35°C higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A) 70.0 K B) 140 K C) 175 K D) 210 K E) 245 K
Coulomb's Law: A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force on it is zero?
A. 3.4a B. 6.8a C. 8.6a D. 9.3a E. 1.0a