Why are clay surfaces good at promoting the formation of biological polymers?
A) they are the only types of material monomers will stick to
B) they bring monomers close together, allowing them to react with each other
C) they are very common on the Earth
D) clays are made of biological polymers
B
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According to general relativity, how is time affected by gravity?
A) Time runs slower in places where gravity is stronger. B) Time runs faster in places where gravity is stronger. C) Time is stopped in places where gravity is strong. D) Time is not affected by gravity.
According to Archimedes’ principle, the buoyant force
A. is equal to the mass of the object B. is always greater than the weight of the object C. is equal to the weight of the displaced fluid D. is less than the weight of the displaced fluid if the object sinks
On a Hertzsprung-Russell diagram, where would you find red giant stars?
A) upper right B) lower right C) upper left D) lower left
Work: How much work would a child do while pulling a 12-kg wagon a distance of 4.3 m with a 22 N force?
A. 95 J B. 52 J C. 66 J D. 109 J