Vision Problems: If the lens in a person's eye is too highly curved, this person is suffering from

A. farsightedness.
B. spherical aberration.
C. astigmatism.
D. chromatic aberration.
E. nearsightedness.


Answer: E

Physics & Space Science

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An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to reach you is

a. 20 s b. 10 s c. 1 s d. 0.1 s e. more than 20 s

Physics & Space Science

In a steam engine, steam at 140°C in a turbine does work on an external system, and the steam leaves the turbine at 100°C. The efficiency of the steam engine is 5%. The relevant physical principle is the __________ law of thermodynamics

Fill in the blank(s) with correct word

Physics & Space Science

A stellar core with a mass greater than 3 solar masses will collapse until it reaches _____

a. the radiusof Earth b. the radius of Mt. Everest c. the radius of a grain of sand. d. the radius of a helium atom e. a radius of zero

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According to current understanding of plate tectonics, which of the following is true about Earth's seafloors?

A) They are built from rocks that are older than the rocks found on the continents. B) They represent the thickest regions of Earth's crust. C) Their material is almost completely recycled over a time period of about 200 million years. D) They should be covered with numerous impact craters dating to the time of the heavy bombardment.

Physics & Space Science