Which type of star spends the shortest time as a main sequence star?
A) B star B) G star C) O star D) M star
C
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The corona and chromosphere of the Sun are believed to be heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. sunspots. d. magnetic carpets. e. differential rotation.
What is a planetary nebula?
A) gas ejected from a low-mass star in the final stage of its life B) gas created from the remains of planets that once orbited a dead star C) interstellar gas from which planets are likely to form in the not-too-distant future D) the remains of a high-mass star that has exploded
What is the exosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere in which the greenhouse effect is strongest E) the outermost, very low-density region of the atmosphere
Consider a square which is 1.0 m on a side. Charges are placed at the corners of the square as follows: +4.0 ?C at (0, 0); +4.0 ?C at (1, 1); +3.0 ?C at (1, 0); -3.0 ?C at (0, 1)
What is the magnitude of the electric field at the square's center? A) 1.1 × 105 N/C B) 1.3 × 105 N/C C) 1.5 × 105 N/C D) 1.7 × 105 N/C E) 1.9 × 105 N/C