A proton is an example of

A)

a lepton.
B)

a meson.
C)

a baryon.
D)

a gauge boson.
E)

none of the above.


C

Physics & Space Science

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One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (LF,ice = 3.33 × 105 J/kg; cice = 2.09 × 103 J/kg?°C)

A. 13 B. 1.5 C. 15 D. 16 E. 33

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What is the solar wind, and how does it affect objects in the solar system?

What will be an ideal response?

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Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/s2?

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