Recent content by Physicsman567

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    Why does P -> Q hold true when P is false and Q is true in mathematical logic?

    Thank you all so much!
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    Why does P -> Q hold true when P is false and Q is true in mathematical logic?

    Thank you very much Andrew Mason and Svein.
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    Why does P -> Q hold true when P is false and Q is true in mathematical logic?

    When P -> Q, why is it true when P is false and Q is true, but why is it false when P is true and Q is false? If I suppose P mean "Jon is a guy" and Q mean "Mary is a girl". When both P and Q are true it does make sense that this proposition is true because Jon is a guy and Mary is a girl...
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    Can Henry Be Converted to Ohm?

    Homework Statement I came across a question in my homework sheet where it give the unit of "L" in ohm when it supposed to be "Henry" (right?). So I just wondering, can ohm be converted into Henry? Homework EquationsThe Attempt at a Solution
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    Wave, finding the velocity of the incoming car.

    I solved it!
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    Wave, finding the velocity of the incoming car.

    Homework Statement [/B] The highway police, stationary hidden behind the barrier, shoot a radio wave that got a frequency of 8 GHZ, from his radar gun to measured the velocity of the incoming car, that's coming toward him. After the radio wave hit the car and reflect back, the police found...
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