Recent content by thwhistler

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    High School Can microwave radiation penetrates building materials?

    The microwave radiation penetrates building materials effectively, unless you have aluminum foil as an insulator in your house or on your head. A tin foil hat will protect you. An antenna for a microwave measurement could be useful too. The signal power from a cell phone mast is...
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    Lim x -> 0 of (1/(2+x) - 1/2)/x

    You can use "partial fractions" to simplify. [1/(2+x) - 1/2] / x <=> 1/x(2+x) - 1/2x <=> 1/2x-1/(2x+4)-1/2x <=> -1/(2x+4) When x goes to 0, the solution is goes towards -1/4 = -1/(2*0+4) The partial fraction of found by solving 1/x(2+x) = a/x + b/(x+2)
  3. T

    Lim x -> 0 of (1/(2+x) - 1/2)/x

    You can use "partial fractions" to simplify. [1/(2+x) - 1/2] / x <=> 1/x(2+x) - 1/2x <=> 1/2x-1/(2x+4)-1/2x <=> -1/(2x+4) When x goes to 0, the solution is goes towards -1/4 = -1/(2*0+4) The partial fraction of found by solving 1/x(2+x) = a/x + b/(x+2)