Which of the following is the most numerous type of main-sequence star?
A) a G star B) an O star C) an A star D) an M star E) an F star
D
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Velma is in a train moving north at 20 m/s. She throws a stone toward the rear of the train, at 5 m/s relative to herself. Mort, standing beside the tracks, sees the stone move
A) south at 15 m/s. B) south at 25 m/s. C) north at 25 m/s. D) north at 15 m/s. E) north at 20 m/s.
Sound travels fastest in
A) air. B) water. C) steel. D) a vacuum.
Current geological evidence suggests that life
A) took billions of years to appear B) appeared as soon as the Earth formed C) appeared quite early in Earth's history D) appeared relatively recently in Earth's history
A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference
(a) What is the resistance of the wire? (b) What is the resistivity of the material from which the wire is made? What will be an ideal response?