What evidence suggests that the protogalactic cloud that formed the Milky Way resulted from several collisions among smaller clouds?
A) The stars in the halo of the Milky Way are organized into several dense clusters arranged throughout the halo.
B) The Milky Way resembles an elliptical galaxy more than other spirals do.
C) Halo stars differ in age and heavy-element content, but these variations do not seem to depend on the stars' distance from the galactic center.
D) The bulge of the Milky Way is surrounded by many globular clusters, just as elliptical galaxies are.
E) The Milky Way is the central galaxy of a cluster of galaxies.
C
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A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm. What is the magnitude of the electric field at the curved surface of the cylinder?
A. 436 N/C B. 103 N/C C. 51.5 N/C D. 135 N/C E. 0.0
Auroras are caused by
a. gases fluorescing in the atmosphere because of collisions with solar wind particles. b. the magnetosphere of Earth touching its atmosphere. c. the ozone layer being destroyed by UV light. d. a product of the atmospheric greenhouse effect. e. scattering of sunlight from particles in Earth's stratosphere.
Based on observations by the Dawn spacecraft, scientists have concluded that Vesta might be:
A) a planetesimal leftover from the solar system's formation. B) the only remaining protoplanet in our solar system. C) one of the dwarf planets in our solar system. D) a fragment of Mars. E) one of the remnants of the planet that broke up to form the asteroid belt.
The second law of thermodynamics forbids a heat engine to have thermal efficiency of ______________
Fill in the blank(s) with correct word