What was the Stardust mission?

A) a mission to study the composition of an asteroid by hitting it with a massive object and observing the material thrown into space
B) a mission to study the outer planets of the solar system by sending a probe from one to the next with a wide variety of instruments
C) a mission to study the composition of a comet by collecting material from its tail and return that material to Earth
D) a mission to study the surface structure of a comet by dropping a lander onto its surface


C

Physics & Space Science

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The efficiency of inexpensive solar cells is closest to

A. 1% B.12% c. 65% D. 100%

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When a bus brakes to a stop its kinetic energy transforms to

A) stopping energy. B) potential energy. C) energy of motion. D) energy of rest. E) heat.

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A black hole is

A) a region of space that is collapsed in on itself. B) the result of the collapse of supergiant star. C) likely found at the center of each spiral galaxy. D) All of the above

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Potential Energy: An electric dipole with ±5.0 ?C point charges is positioned so that the positive charge is 1.0 mm to the right of the origin and the negative charge is at the origin. How much work does it take to bring a 3.0-?C point charge from very far away to the point x = 3.0 mm, y = 0.0 mm? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)

A. 23 J B. 110 J C. 19 J D. 49 J

Physics & Space Science