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
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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?
The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses. b. 80 solar masses. c. 8 solar masses. d. 0.08 solar masses. e. 0.001 solar masses.
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?
A) 86. lb B) 1.4 × 102 lb C) 1.2 × 102 lb D) 96. lb E) 1.56 × 102 lb
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