Question

35. The resultant of two forces (A+B) and (Ā-B) is a force 13A²+B2. The angla between A+B and Ā-B is​

Answer 1

Answer:

C

=

A

+

B

D

=

A

−

B

∠

C

D

=θ

∠

A

B

=φ

R=

C

2

+D

2

+2CDcosθ

=

(A

2

+B

2

+2ABcosφ)+(A

2

+B

2

−2ABcosφ)+2(A

2

−B

2

)cosθ

=

2A

2

+2B

2

+2(A

2

−B

2

)cosθ

R=

3A

2

+B

2

⇒cosθ=

2

1

⇒θ=

3

π

Explanation:

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