The acceleration of the Universe depends on the effect of ____
a. baryonic matter being greater than the effects of dark matter and dark energy
b. baryonic matter and dark energy being greater than the effect of dark matter.
c. dark matter and dark energy being greater than the effect of baryonic matter.
d. baryonic matter and dark matter being greater than the effect of dark energy.
e. dark matter being greater than the effect of dark energy.
d
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The Hubble time is
a. the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the Universe stops expanding and begins to contract. e. an estimate of the age of the Universe based on the Hubble constant.
Energy Conservation With Conservative Forces: A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A. 3.1 m/s B. 4.4 m/s C. 6.3 m/s D. 8.9 m/s E. 13 m/s
In the gap between quasars and normal spirals lie
A) Fisher-Tully galaxies. B) Irr II galaxies. C) lobe radio galaxies. D) Seyfert galaxies. E) S0 galaxies.
If ? = 40°, ? = 60°, and M = 4.0 kg, determine the tension in string 1
a.
15 N
b.
22 N
c.
17 N
d.
20 N
e.
36 N