The formation of a galactic central bulge is believed to ____

a. be a slow steady process lasting billions of years
b. start after the formation of spiral arms
c. be a violent process which adds mass to the central black hole
d. begin when the central black hole has reached mature size
e. continue throughout the galaxy's life body


c

Physics & Space Science

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Which of the following is a vector quantity?

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What is the energy of the first rotational state of the hydrogen (H2) molecule? The separation between the protons is 10?10 m and the mass of each proton is 1.67 × 10^?27 kg. (h = 6.626 × 10^?34 J ? s and 1 eV = 1.6 × 10^?19 J.)

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A 0.50-kg toy is attached to the end of a 1.0-m very light string. The toy is whirled in a horizontal circular path on a frictionless tabletop. If the maximum tension that the string can withstand without breaking is 350 N

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Dana uses a rope to pull a box that weighs 600 N across a level surface with constant velocity. The rope makes an angle of 40° above the horizontal and the tension in the rope is 400 N. What is the coefficient of friction?

a. 0.89 b. 0.88 c. 2.00 d. 1.19 e. 0.84

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