# Math-Algebra

(Engineering) The current / varies as the electromotive force E and inversely as the resistance R. If in a system, a current of 20A flows through a resistance of 20 ohms with an electromotive force of 100V, find the currect that 150V will send throu+gh the system.

(Navigation) The amount of coal used by a steamship travelling at a uniform speed varies jointly as the distance traveled and the square of the speed. If a steamship uses 45 tons of coal travelling 80 mi at 15 knots, how many tons will it use if it travels 120 mi at 20 knots?

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1. Since current varies directly as E, 1.5(100)V will send 1.5(20) = 30A

c = kdv^2
Since 120/80 = 3/2 and 20/15 = 4/3, the new c will be (3/2)(4/3)^2 * 45 = 120 tons

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posted by Steve
2. Ok. I got the same answers. Thanks.

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3. Thanks to the both of you for helping.

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