An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
What will be an ideal response?
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The six diagrams represent the sky at six different latitudes. Which diagram represents the paths of stars at the North Pole?
What will be an ideal response?
Which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.
Which of the following stars would be most likely to have the same abundance of elements heavier than helium as a red main sequence star in globular cluster M13?
A) a red main-sequence star in the disk of the Milky Way B) red giant in globular cluster M13 C) None of these choices
When the frequency of the source of a water wave increases, the speed of the waves traveling in the water
a. remains unchanged. b. increases. c. decreases. d. cannot be determined.