Physics: Post your doubts here!

[Thought blocker]

Using cosine rule: c^2 = a^2 + b^2 +2abcosC
c^2 = 10^2 + 10^2 +2(100)cos 120
C = 10 N
What are you guys talking about

Zainab, Formula has - Sign instead of + So make her understand why we used + ?

 

[mehria]

the law of cosine is a square + b square -2ab cos angle c = c square

ikr... it cn never have '+' sign....

 

[ZaqZainab]

the law of cosine is a square + b square -2ab cos angle c = c square

that's how my teacher thought me

 

[Thought blocker]

that's how my teacher thought me

 

[usama321]

that's how my teacher thought me

Well then, he/she is teaching you wrong Google it

 

[ZaqZainab]

maybe this would make more sense

then wat is it?? sorry m confuseddddd...........

 

[mehria]

so wat will b the correct solution for this MCQ usama321 ??? i tried ur method but still didnt get it

 

[usama321]

maybe this would make more sense

so wat will b the correct solution for this MCQ usama321 ??? i tried ur method but still didnt get it

This is how i solved it and explained to you. Maybe the diagram will help

 

[Thought blocker]

I got thee answer yupy!

 

[mehria]

maybe this would make more sense

This is how i solved it and explained to you. Maybe the diagram will help

then it means that the resultant force is already given in the diagram...

 

[ZaqZainab]

then it means that the resultant force is already given in the diagram...

if they had given different values then the resultant force would be different and not the same as the forces given in the diagram

 

[mehria]

if they had given different values then the resultant force would be different and not the same as the forces given in the diagram

m still confused... btw thnks to all

 

[mehria]

i got it now... the forces to the right is +ve and the forces to the left is -ve...
that's y when we solve the question we get 10N as an answer....
i.e. a^2=(10)^2 + (-10)^2 - 2(10)(-10)cos120

 

[Thought blocker]

i got it now... the forces to the right is +ve and the forces to the left is -ve...
that's y when we solve the question we get 10N as an answer....
i.e. a^2=(10)^2 + (-10)^2 - 2(10)(-10)cos120

Bingo!

 

[mehria]

Bingo!

try to clear ur concepts instead of mkng smthng by ur own

 

[Thought blocker]

try to clear ur concepts instead of mkng smthng by ur own

ok

 

[mehria]

ok

yes... i told u ths just to make the whole cncpt clear to all of us...

 

[mehria]

ok

y u deleted that maths question??

 

[Thought blocker]

y u deleted that maths question??

I posted in math doubt, I forgot it is phy doubt thread.

 

[mehria]

I posted in math doubt, I forgot it is phy doubt thread.

oh ryt