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
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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
What is the maximum speed the mass can have without breaking the string? A) 700 m/s B) 26 m/s C) 19 m/s D) 13 m/s
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
Which of the following is a vector quantity?
a. Force b. Power c. Work d. Time e. None of these
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.)