If gravity is unimportant, and H equals 75 km/sec/Mpc, then the age of the universe is about
a. 8.9 billion years.
b. 13 billion years.
c. 16.6 billion years.
d. 26 billion years.
e. 74 billion years.
B
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A 1000-kg barge is being towed by means of two horizontal cables. One cable is exerting a force of 80.0 N in a direction 30.0° west of north
In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge. A) 19.5° east of north B) 21.1° east of north C) 39.0° east of north D) 47.5° east of north E) 54.7° east of north
Why does the Moon have a layer of "powdery soil" on its surface?
A) Recent, large impacts shattered lunar rock to make this soil. B) It is made by the same processes that make powdery sand on Earth. C) It is the result of countless tiny impacts by small particles striking the Moon. D) It exists because the Moon accreted from powdery material after a giant impact blasted Earth.
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is ? rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
a. zero b. 13 mV c. 26 mV d. 20 mV
Matter swirling into a compact object forms a(n) _______________ disk
Fill in the blank(s) with correct word