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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze ...

  3. RC time constant - Wikipedia

    en.wikipedia.org/wiki/RC_time_constant

    The time constant is related to the cutoff frequency fc, an alternative parameter of the RC circuit, by. or, equivalently, where resistance in ohms and capacitance in farads yields the time constant in seconds or the cutoff frequency in Hz. Short conditional equations using the value for : fc in Hz = 159155 / τ in μs. τ in μs = 159155 / fc ...

  4. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    The doubling time is the time it takes for a population to double in size/value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time. When the relative growth rate (not the absolute growth rate) is constant ...

  5. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    Animation showing the difference between a sidereal day and a solar day. Sidereal time ("sidereal" pronounced / saɪˈdɪəriəl, sə -/ sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system, it is easy to locate the positions of celestial objects in the night sky.

  6. Time is Money: a review of the Meeting Cost Calculator and ...

    techcrunch.com/2010/04/23/time-is-money-a-review...

    Simply saunter (or swagger, if you prefer) into your next business meeting with TIM in your hand. Plop TIM down on the table, and press the plus or minus button to set the average hourly rate of ...

  7. Check or calculate the value of a savings bond online - AOL

    www.aol.com/finance/check-calculate-value...

    You can check the value of your savings bond through the TreasuryDirect website. Even if you have paper savings bonds, you can check your value online, as long as you have the issue date, bond ...

  8. Use your iPhone to impress your friends with these cool ...

    www.engadget.com/2013-11-12-use-your-iphone-to...

    Open your iPhone calculator. Type in the first 3 digits of your phone number (not your area code) (So you would type in 759 if your number was 801-759-1234) Multiply that number by 80 (759 x 80 ...

  9. Mean time between failures - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_failures

    Mean time between failures ( MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system. The term is used for repairable systems while mean time to failure ( MTTF) denotes the expected ...

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