Transformers: An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,(a) what voltage is present in the secondary?(b) what current is present in the secondary?
Fill in the blank(s) with the appropriate word(s).
(a) 240 V (b) 0.40 A
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The air in this room has
A) mass. B) weight. C) energy. D) all of the above E) none of the above
If perihelion of Earth were noticeably closer to the sun than is currently the case, what would be the probable affect on the climate of the Southern Hemisphere?
a. Their winter season would be much colder than present. b. Their winter season would be much warmer than present. c. Their summer season would be much colder than present. d. Their summer season would be much warmer than present. e. Their would be no change in any of their seasonal temperatures.
What is the "runaway greenhouse effect"?
What will be an ideal response?
A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down. b. down and inwards. c. down and outwards. d. down and backwards. e. down, inwards and backwards.