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    susus's Avatar
    susus Posts: 138, Reputation: 2
    Junior Member
    		  
    #1

    Feb 28, 2011, 07:51 AM
    Vector operations: Please i can not know whether each statement is true or false.
    Vector operations: so I need help to know when one is true or false.
    The x-component of a vector can be (+),(-), or zero
    A × C = C × A
    The scalar (or dot) product of two vectors can be (+),(-), or zero
    If A is perpendicular to B, then B • A = 0
    The magnitude of a vector is always positive or zero.
    If A = B × C and C = 16j, then Ay =0

    thanks,
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
    Senior Member
    		  
    #2

    Feb 28, 2011, 08:19 AM
    susus, copying and pasting doesn't work very well here. You'll need to repost your question, typing it in manually. Otherwise, your question is unreadable.

    Also, you'll need to show some work on your part so we know you're actually trying. We're here to help, not to do your homework for you. What do you think the answers are and why?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #3

    Feb 28, 2011, 08:43 AM

    If I understood well, there are 3 statements?

    The x-component of a vector can be (+),(-), or zero
    A × C = C × A

    The scalar (or dot) product of two vectors can be (+),(-), or zero
    If A is perpendicular to B, then B • A = 0

    and

    The magnitude of a vector is always positive or zero.
    If A = B × C and C = 16j, then Ay =0

    ?

    If so, then I'd ask you to say what you think are true and which are false. You should know by now how asking homework questions work...
    susus's Avatar
    susus Posts: 138, Reputation: 2
    Junior Member
    		  
    #4

    Feb 28, 2011, 02:53 PM
    Comment on Unknown008's post
    I just want to tell you that in my physics course which is 8 points, I got 99/100, and I want to thank you, for letting me think , and because you never just gave me the answers .
    I really worked hard for that score. Thanks.
    I will try again and then submit my answer
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