Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found
A) in the halo.
B) only in or near star-forming clouds.
C) only in the central bulge.
D) evenly spread throughout the galactic disk.
B
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How have astronomers discovered planets orbiting a star beyond the Sun?
A. They can see the planet brighten as it passes in front of its parent star. B. They have bounced radar off them. C. They can be detected by the slight gravitational tug that they exert on their parent stars. D. So far, no planets have been discovered around any other stars.
Momentum is defined as
A) mass multiplied by velocity. B) mass multiplied by speed. C) force multiplied by velocity. D) mass multiplied by acceleration.
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z has a positive charge. E. Z is neutral (has no net charge).
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
A. 22 J B. 16 J C. 13 J D. 19 J E. 8.0 J