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  • Calculating Electricity Needs?

    How much energy can be stored in a common 12 volt automotive battery? How much energy in terms of amps? and watts?

    If I have an alternator that produces 40 amps into a 12 volt battery, how long would it take the battery to get full? And how many watts of electricity has been created?

    Thanks a ton!!!

    2 AnswersOther - Science1 decade ago

  • Magnetic to Magnet Shield?

    What material can be used to shield magnets from each other if I held two magnets that attract each other in my hand?

    1 AnswerOther - Science1 decade ago

  • Math Probability/Combinations?

    I'm forgetting how to do the combinations correctly. Say there are five categories, and three possible items in each category, how many possible combinations are there? Just a random example, pretend there are five divisions in a sports league and there are three teams in each division...

    Could you please explain how the answer is derived? I used to know combinations and permutations but it's been soooo long I honestly can't remember. I used to remember what nPr and nCr and "!" etc were used for but I forget it all!

    Is it 3!x3!x3!x3!x3!x3! ?

    2 AnswersMathematics1 decade ago