All of the following are scalars, except
A) mass.
B) force.
C) temperature.
D) distance.
E) time.
B
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A ball is released moving straight up at 15. m/s. At some time later it is falling downward at 15. m/s. What was the magnitude of its average velocity over this time period?
A) 0. m/s B) 30. m/s C) 15. m/s D) 7.5 m/s E) 22. m/s
Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf B) protostar, main-sequence, white dwarf, red giant C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, red giant, white dwarf E) red giant, protostar, main-sequence, white dwarf
The main energy transformation that occurs while an electric blender is mixing your orange juice is
A) electric E ? kinetic E. B) chemical E ? thermal E. C) electric E ? chemical E. D) kinetic E ? electric E. E) thermal E ? kinetic E.
The distance between two asteroids is 1600 km. How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)
A) 19 ms B) 4.5 ms C) 5.3 ms D) 13 ms E) 19 µs