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?

  1. 👍 0
  2. 👎 0
  3. 👁 49
  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

    1. 👍 0
    2. 👎 0
    posted by Steve
  2. Ok. I got the same answers. Thanks.

    1. 👍 0
    2. 👎 0
  3. Thanks to the both of you for helping.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. nwfsc

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 20 A (amperes), the resistance is 7 ohms. What is the resistance when the current is 14 A ?

    asked by Anonymous on November 10, 2015
  2. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked by n on November 7, 2012
  3. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked by n on November 7, 2012
  4. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked by n on November 7, 2012
  5. Physics

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?

    asked by Rachal on February 9, 2011
  6. math

    The current I in an electrical conductor varies inversely as the resistance r of the conductor. The current is 6 amperes when the resistance is 920 0hms , what is the current when the resistance is 560 ohms

    asked by De'andre on January 20, 2012
  7. beginning algebra

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?

    asked by Rachal on February 8, 2011
  8. Algebra

    in an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 5A, the resistance is 20 ohms. What is the current when the resistance is 25 OHMs?

    asked by Wendy on March 1, 2014
  9. Math

    Amperes (abbreviated amp) measure the strength of electric current. An ohm is the unit of electrical resistance. In an electric circuit, the current varies inversely as the resistance. If the current is 24 amps when the resistance

    asked by Haylie on May 14, 2012
  10. ALG WORD PROBLEM

    The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is 9 amperes when the resistance is 940 ohms. What is the current when the resistance is 580 ohms? Thank you yet again.

    asked by TOTALLY lost on March 11, 2012

More Similar Questions