The angular size of your fist, held at arm’s length, is about
a. 1 degree.
b. 10 degrees.
c. 12.7 centimeters.
d. 25.4 centimeters.
Answer: b. 10 degrees.
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A) cut in half. B) full length. C) either cut in half or full length.
Firefighters find that the temperature of burning material is best lowered when water is
A) used in small amounts. B) pointed away from the flames. C) sprayed as a fine mist. D) salted.
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?
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If the size of our solar system were scaled down to a radius of 1 kilometer, approximately how far away would the nearest stars be on this scale?
A) several hundred kilometers B) several million kilometers C) several thousand kilometers D) several billion kilometers