A generator produces 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by an ideal transformer and transmitted through a power line of total resistance 1.0 ?
Find the number of turns in the secondary if the primary has 200 turns.
A) 4500 B) 7500 C) 200 D) 5
B
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To make an n-type semiconductor from silicon, one adds impurity atoms of
A. cobalt. B. oxygen. C. arsenic. D. fluorine. E. gallium.
Astronomers think the Milky Way has spiral arms because
A. they can see them unwinding along the celestial equator. B. Pop II stars, hot molecular clouds, and asterisms outline spiral arms. C. globular clusters outline spiral arms. D. radio maps show that gas clouds are distributed in the disk with a spiral pattern. E. All of these choices are correct.
A Carnot engine is operated between a hot and a cold reservoir. The temperature difference between the two reservoirs is 284°C. If the efficiency of this ideal engine is 24.0%, find the temperature of the cold reservoir in °C
What will be an ideal response?
If you see the stars and constellations rotating around a point in the night sky in the clockwise direction, you are looking north
a. True b. False Indicate whether the statement is true or false