Estimation: Which of the following is the most reasonable estimate of the number of characters (typed letters or numbers) in a 609-page book? Assume an average of 194 words per page and a reasonable average number of letters per word.
A. 5 × 105 char
B. 5 × 107 char
C. 5 × 106 char
D. 5 × 104 char
Answer: A
Physics & Space Science
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John's mass is half the mass of Jill. They both start walking and John moves twice as fast as Jill. What is the ratio of the kinetic energy of Jill to the kinetic energy of John?
A) 4 B) 2 C) 1 D) 1/2 E) 1/8
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The pressure in a liquid depends on liquid
A) density. B) depth. C) both of these D) none of the above
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All the known matter, both normal and dark, only gives us an ?o of about .3
Indicate whether the statement is true or false
Physics & Space Science
When a light wave enters into a medium of different optical density
A) its speed and frequency change. B) its speed and wavelength change. C) its frequency and wavelength change. D) its speed, frequency, and wavelength change.
Physics & Space Science