Someone shakes a string to create a wave. The string is tied to the other side of a room. The wave takes 2.0 seconds to propagate from one end of a room to the other. If this experiment is repeated, how could the wave be made to travel across the room in 4.0 seconds?
1.Shake the string half as quickly.
2.Shake the string with vibrations that are half the amplitude.
3.Double the string tension.
4.Quarter the string tension.
4
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A large _______________ makes it easier for a planet to hold onto orbiting ring particles
Fill in the blank(s) with correct word
According to the nebular theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because only metal and rock could condense in the inner solar system, whereas ice also condensed in the outer solar system B) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system D) because only the outer planets captured hydrogen and helium gas from the solar nebula
This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?
A) its mass B) its age C) its chemical composition D) all of the above
Characteristic x-ray spectra come from