The observation of a "wet spot" on a hot highway in the summer is caused by

a. dispersion.
b. diffraction.
c. refraction.
d. reflection.


c

Physics & Space Science

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A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?

A. 30 hours B. 24 hours C. 20 hours D. 18 hours E. 12 hours

Physics & Space Science

A taxicab moves five blocks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point?

a. 13 blocks b. 9.4 blocks c. 9.2 blocks d. 8.6 blocks

Physics & Space Science

In a wet and humid climate, the mineral halite will succumb to weathering more easily than granite because

A) granite is more resistant. B) halite readily dissolves in water. C) halite is relatively soft (hardness of 2.5). D) all of the above.

Physics & Space Science

A spaceship is moving past us at a speed close to the speed of light. What would we conclude about time (clocks) on the spaceship as it goes by?

A) Time is the same for everyone. B) We would conclude that their clocks are going at the same rate as ours. C) We would conclude that their clocks are going exactly half as fast as ours. D) We would conclude that their clocks are going faster than ours. E) We would conclude that their clocks are going slower than ours.

Physics & Space Science