Question

plz solve these two questions of vector

Answer 1

Answer:

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First of all the question should be

|a×b|=√3a.b because a vector can never be equal to a scalar.

So |a×b|=ab sintheta where theta is angle between 2 vectors.

a.b=ab costheta

Equating above two we get

Sintheta=√3costheta

=> tantheta =√3

=> theta =60 ° or 240° or more general theta = nπ+60°.

so |a+b| =√|a|^2+|b|^2+2|a||b| costheta)

Since we have two different values of theta there are two different answers.

1st answer is√|a|^2+|b|^2+|a||b| )

2nd answer is√|a|^2+|b|^2-|a||bl )

Explanation:

Answer 2

Answer:

Explanation:

Then F1 = 30N &

F2=20N &

The next one is not known by me sorry