What is the magnitude of vertical force required to produced a moment of 20 Nm at point A (1 m, 1 m) if the force is acting at point B (2m,2m)
A
40 N
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B
30 N
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C
20 N
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D
10 N
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Solution
The correct option is C 20 N let the Force vector be →F^j Radial vector ¯¯¯¯¯¯¯¯BA=^i+^j we Rnow foru moment →τ→τ=→r×→F=(^i+^j)×F^j→τ=F^k and |→τ|=20Nm given ⇒F=20N Hence, option (c) is correct.