CBSE Class 11-science Answered
at what angle do forces P+Q and P-Q act so that their resultant is
Asked by | 18 Dec, 2009, 01:14: PM
Expert Answer
R = (F12 + F22 +2F1F2cosθ)1/2
cosθ = (R2 - F12 - F22 )/(2F1F2)
= (3P2+Q2 - (P+Q)2 - (P-Q)2)/(2(P+Q)(P-Q))
= (3P2+Q2 -2P2 - 2Q2 )/(2(P+Q)(P-Q))
= (P2-Q2)/(2(P2-Q2))
= 1/2
Hence the angle is 600
Regards,
Team,
TopperLearning.
Answered by | 18 Dec, 2009, 06:30: PM
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