The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?

A. 16 s
B. 21 s
C. 24 s
D. 14 s
E. 19 s


Answer: A

Physics & Space Science

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Earth possesses few visible craters and the Moon possesses many. This is because

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Potential: As a proton moves in the direction the electric field lines

A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.

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In a nuclear reactor, how many neutrons [on the average] created during the fission of a 235U nucleus cause further fission in other uranium nuclei?

A) None B) Less than one C) More than one D) One E) Ten

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When the frequency of the source of a water wave increases, the speed of the waves traveling in the water

a. remains unchanged. b. increases. c. decreases. d. cannot be determined.

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