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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Physics & Space Science

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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?

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science