Which scientists played a major role in overturning the ancient idea of an Earth-centered universe, and about when?
A) Copernicus, Kepler, and Galileo; about 400 years ago
B) Aristotle and Copernicus; about 400 years ago
C) Newton and Einstein; about 100 years ago
D) Huygens and Newton; about 300 years ago
E) Aristotle and Plato; about 2,000 years ago
A
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An airplane is traveling at 150 m/s in level flight. If the airplane is to make a change in direction, it must travel in a horizontal curved path. To fly in the curved path, the pilot banks the airplane at an angle such that the lift has a horizontal component that provides the horizontal centripetal acceleration to move in a horizontal circular path. If the airplane is banked at an angle of 12.0 degrees, then the radius of curvature of the curved path of the airplane is
A. 10.8 km. B. 8.74 km. C. 8.00 km. D. 7.33 km. E. 6.90 km.
About 80% of the mass of the atmosphere and most of the clouds and water vapor are located in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. The charges on the inner and outer surfaces of the shell are, respectively,
A. ?q, ?q. B. ?q, +q. C. +q, ?q. D. +q, +q. E. +q, 0.
A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A) 53.1° S of E B) 53.1° E of S C) 36.9° E of S D) 36.9° S of E