There are more large spiral galaxies than there are large elliptical galaxies
Indicate whether the statement is true or false
TRUE
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A surprise from the Pioneer Venus photos was that:
A) the craters on Venus are all large. B) the clouds rotate around the planet in only four days, very unlike the slow surface rotation. C) the clouds of Venus are mainly water vapor, like our own. D) the highest volcano, Maxwell Mons, protrudes above the cloud deck. E) no impact craters at all are found on the Venusian surface.
Large amounts of material can often be seen rising from the cooling towers often seen at steam-electric power plants. These emissions are mostly
A) radioactive waste. B) soot. C) oxides of sulfur. D) water vapor, i.e., steam. E) carbon dioxide.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (-2, -2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (-3, -1) m b. (+1, +3) m c. (+3, -1) m d. (-1, -3) m e. (-0.5, -2) m
A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. Under double the compression, the spring is now used to launch the mass. How high does the mass now rise above its starting position?
a. 2h c. 3h b. 1.41h d. 4h