Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
0.15 m/s
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One way astronomers deduce that the Milky Way has a disk is that they
A. see the same number of stars in all directions in the sky. B. see far more stars along the band of the Milky Way than in other directions. C. see a large dark circle silhouetted against the Milky Way in the Southern Hemisphere. D. see stars arranged in a circular region around the north celestial pole. E. None of these choices is correct.
A gamma ray is another name for a(n)
a. electron b. proton c. neutron d. helium nucleus e. photon
Venus is most like Earth in terms of size
a. True b. False Indicate whether the statement is true or false
According to the theory of cosmic inflation, the universe
A) began as the result of the "big crunch" collapse of some pre-existing universe. B) began from a powerful electromagnetic effect in vacuum. C) had no beginning but instead has always existed. D) began as a tiny fragment of space and time. E) began when two very massive pre-existing particles collided and annihilated with each other.