Question

The force of magnitude 15n and 8n act a point.if magnitude of resultant is 17n,the angle between forces

Answer 1

Resultant of two vector like A and Bis given by
R^2= (A^2 +B^2 + 2AB×cosP)
17^2= (15^2 +8^2 + 2×15×8 cosP)
289 = (225 + 64 + 240 cosP)
289 = 289 + 240cosP
cosP= 0
P = 90 degree