A hiker walks 200 m east and then walks 100 m north. In what direction is her resulting displacement?

a. north
c. northeast
b. east
d. None of the answers is correct.


D

Physics & Space Science

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Which of the following statements is true about the very early universe (within the first three minutes)?

a. The electroweak force was the force believed to have first separated from the others. b. The entire first three minutes can be explained by applying a grand unified theory. c. Electrons only formed after the protons and neutrons. d. The end of the first three minutes signaled the first probable nucleosynthesis. e. By about 1 second, the universe was about half the present size.

Physics & Space Science

An electrical generating plant operates at a boiler temperature of 218°C and exhausts the unused heat into a nearby river at 24°C. What is the maximum theoretical efficiency of the plant? (0°C = 273 K)

a. 16% b. 62% c. 63% d. 40% e. 73%

Physics & Space Science

Copernicus proposed his theory because

A) he thought that Ptolemy's theory was too messy and that his was more "fitting." B) it was obvious to most educated people by that time that Earth orbits the sun. C) Ptolemy's theory was known to be wrong. D) it was more in line with Church thinking than was the pre-Christian Greek theory. E) it fit the data taken by Tycho Brahe.

Physics & Space Science

In a colliding-beam experiment, protons moving at 0.800 c in opposite directions strike one another. What is the speed of the incoming proton as viewed by the proton about to be hit?

A. 1.60 c B. 0.00 C. 0.640 c D. 0.976 c E. 0.960 c

Physics & Space Science