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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: solve this plz.. and explain too..
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[Post New]6 Jun 2008 16:11:11 IST
    Subject: solve this plz.. and explain too..
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anpm_dev (111)

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If and are mutually perpendicular unit vectors, then is equal to :

 




  1. 3












  4. 1




 
The deepest secret is that life is not a process of discovery, but a process of creation. You are not discovering yourself, but creating yourself anew. Seek therefore, not to find out who you are; seek to determine who you want to be."
    
[Post New]6 Jun 2008 16:16:58 IST
    Subject: Re:solve this plz.. and explain too..
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allamraju (3415)

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Simple yaar...Ia+b+cI2=a2+b2+c2+2(a.b+b.c+c.a)=3+2(0)=3

Since a,b,c are mutually perpendicular,a.b=b.c=c.a=0 and a2=b2=c2=1 as it is mentioned that they are unit vectors.

So,the answer is .
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[Post New]6 Jun 2008 16:19:54 IST
    Subject: solve this plz.. and explain too..
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anpm_dev (111)

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oops truly.. that was quite simple.. well i've rated u because of my foolishness.
The deepest secret is that life is not a process of discovery, but a process of creation. You are not discovering yourself, but creating yourself anew. Seek therefore, not to find out who you are; seek to determine who you want to be."
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