The relatively small number of impact craters and the near absence of small craters on the surface of Venus are thought to be a result of:
A) the soft and resilient nature of the Venusian surface.
B) the thick Venusian atmosphere.
C) the position of Venus in the solar system—not many meteoroids cross Venus' orbit.
D) Venus' lack of a satellite.
E) the ancient oceans that once existed on Venus.
A
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How do we know that galaxy clusters contain a lot of mass in the form of hot gas that fills spaces between individual galaxies?
A) We detect this gas with x-ray telescopes. B) We infer its existence by observing its gravitational effects on the galaxy motions. C) The hot gas shows up as bright pink in visible-light photos of galaxy clusters. D) We can observe the frictional effects of the hot gas in slowing the speeds of galaxies in the clusters.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The kinetic energy of the crate is 1/2 mv2
a. True b. False Indicate whether the statement is true or false
Which of the following wavelengths could NOT be present as a standing wave in a 2 m long organ pipe open at both ends?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
Which space mission orbited Jupiter and dropped a probe into Jupiter's atmosphere?
a. Pioneer b. Voyager c. Galileo d. Cassini e. New Horizons