[計量] 請教一題計量
for a light that has an intensity of 60 candles at its source, the intensity
in candles, S, of the light at a point d feet from the source is given by the
formula S=60k/(d^2) , where k is a constant. if the intensity of the light is
30 candles at a distance of 2 feet from the source, what is the intensity of
the light at a distance of 20 feet from the source?
Ans: 3/10 candles
拜託各位高手了，文意實在不好理解...
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10/23 18:39, , 1F
10/23 18:39, 1F
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10/23 18:39, , 2F
10/23 18:39, 2F
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10/23 18:40, , 3F
10/23 18:40, 3F
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10/23 18:41, , 4F
10/23 18:41, 4F
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10/23 18:42, , 5F
10/23 18:42, 5F
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10/23 18:42, , 6F
10/23 18:42, 6F
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10/23 18:43, , 7F
10/23 18:43, 7F
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10/23 19:46, , 8F
10/23 19:46, 8F
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