The impulse required to bring an auto to a stop is ordinarily provided by ________ forces.
Fill in the blank(s) with the appropriate word(s).
frictional
external
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The equilibrium rule states that the vector sum of all forces acting on a
A) body at rest is zero. B) body in uniform motion is zero. C) non-accelerating body is zero. D) all of the above
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^-23 m. c. 1.84 × 10^-14 m. d. 1.80 × 10^-13 m. e. 2 m.
The semi major axis of an ellipse is
a. the ratio of the longest diameter of the ellipse to that of the shortest diameter of the ellipse. b. half the length of the shortest diameter of the ellipse. c. half the length of the longest diameter of the ellipse. d. the distance between the two foci of the ellipse. e. the ratio of the distance between the two foci to the length of half the longest diameter of the ellipse.
The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true? I. Circini has a surface temperature less than the sun. II. Circini has a diameter that is greater than that of the sun. III. Circini is more luminous than the sun. IV. Circini is located near the upper left hand corner in the HR diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV