Which of these is the next evolutionary track for the Large Magellanic Cloud?
A) It will be free of our Local Group.
B) contraction into a spiral
C) collision with the Milky Way
D) It will become a satellite galaxy of Andromeda.
E) expansion into a giant elliptical
C
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In contrast to the outer solid mantle, parts of the central regions of Earth's interior are thought to be fluid because
a. P seismic waves cannot make it through those regions. b. S seismic waves cannot make it through those regions. c. neither P nor S seismic waves can make it through those regions. d. both P and S seismic waves easily make it through those regions.
Magnetic Field of a Current Loop: A long straight wire on the z-axis carries a current of 8.0 A in the +z direction (out of the paper). A circular loop of radius 10 cm lies in the xy-plane and carries a 3.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 3.0 × 106 m/s in the -x direction. What is the y component of the magnetic force on the electron? (e = 1.60 × 10-19, ?0 = 4? × 10-7 T ? m/A)
A. -9.0 × 10-18 N B. 9.0 × 10-18 N C. -4.5 × 10-18 N D. 4.5 × 10-18 N E. zero
If Newton's law of universal gravitation turned out to be Gm1m2/r rather than Gm1m2/r2, tides on Earth
A. would not happen because the force of gravity from the Moon would be too strong. B. would still occur because each side of the Earth would feel a different gravitational force from the Moon. C. would not occur because gravity would then be a repulsive force. D. would not occur because the Sun would cancel out the Moon's gravity.
The post-Newtonian age began in 1900 when
A) Einstein introduced the general theory of relativity. B) Maxwell introduced electromagnetic waves. C) Michelson declared the Newtonian age was over. D) Einstein introduced the special theory of relativity. E) Max Planck introduced the quantum of energy.