A 5.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, ?4.0) m. What is the moment of inertia of this system of masses about the x axis?
a. 280 kg·m2 b. 33 kg·m2
c. 176 kg·m2 d. 99 kg·m2
e. 44 kg·m2
c
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How does the traditional theory of the formation of the galaxy explain the origin of globular clusters?
a. They formed in the disk and later were ejected to the halo. b. They formed in other galaxies and were captured by close interactions. c. They build over time from the collision of stars in the halo. d. They formed early on during the free-fall collapse of the proto-galactic material.
Viscosity: A fluid is flowing with an average speed of 1.5 m/s through a tube that has a radius of 2.0 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?
A. 0.0018 N ? s/m2 B. 0.0056 N ? s/m2 C. 0.028 N ? s/m2 D. 0.013 N ? s/m2 E. 0.0034 N ? s/m2
Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers
The unusually bright centers found in some galaxies are called
A) active galactic nuclei. B) halos. C) supermassive black holes. D) starbursts.