Compared to a G-type star, an F-type will have a(n) ________ habitable zone
Fill in the blank(s) with correct word
larger
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A protostar develops a bipolar flow of gas when it is still surrounded by an equatorial disk of ________
Fill in the blank(s) with correct word
The primary of a transformer is the coil connected to
A) the load. B) the Internet. C) the input power line. D) none of the above
What is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down?
A. The acceleration of the rock thrown upward has the same value of 7.2 m/s-sq downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will not change but the acceleration will remain different in magnitude and direction. B. The acceleration of the rock thrown upward has the same value of - 9.8 m/s2 downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will be changing but the acceleration will remain the same in magnitude and direction throughout its trip. C. The acceleration of the rock thrown downwards has the same value of 5 m/s-sq downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will be changing but the acceleration will remain the same in magnitude and direction throughout its trip.
Which of the following statements about parallax is not true?
A) The existence of stellar parallax is direct proof that Earth orbits the Sun. B) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes. C) Ancient astronomers were unable to measure parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe. D) Measurement of stellar parallax allows us to determine distances to nearby stars. E) The technique of stellar parallax was used by Hubble to determine that the Andromeda Galaxy (M 31 ) is about 2 million light-years away.