When we see a meteor shower, it means that ________
A) an Earth-approaching asteroid has recently come very close to our planet
B) you should duck and run for cover to avoid being blasted on the head by a rock from space
C) the solar wind is unusually strong
D) Earth is crossing the orbit of a comet
D
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When a photon collides with a free electron at rest and the direction of motion of the photon changes,
a. the magnitude of the momentum of the photon does not change. b. the momentum of the electron does not change. c. the kinetic energy of the electron does not change. d. the total energy of the photon does not change. e. both the magnitude of the momentum and the total energy of the photon decrease.
The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun
The great contribution of Nicholas Copernicus was to ________
A) create a detailed model of our solar system with the Sun rather than Earth at the center B) discover the laws of planetary motion C) discover the law of gravity D) prove that the Earth is not the center of the universe
Two parallel wires run in a north-south direction. The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward. If the wires are separated by 30 cm, what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?
A. 3.0
T
B. 6.0T
C. 15T
D. 27T
E. 90T