The sum of the magnitudes of two forces acting at a point is 16 N. The resultant of these forces is perpendicular to the smaller force and has a magnitude of 8 N. If the smaller force is of magnitude x, then the value of x is
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a
2N
b
4N
c
6N
d
7N
answer is C.
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Detailed Solution
x + y =16. Also, y2= 82+ x2 or y2= 64 + 16 − y2 [ x = 16 − y] or y2= 64 + 256 +y2− 32y or 32y = 320 or y = 10 N ⇒ x + 10 = 16 or x = 6N