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Amolika Krishnamurthy
Asked: 2022-11-05T21:46:43+05:30 In:

A force of `-Fhatk` acts on O, the origin of the coodinate system. The torque about the point (1,-1) is
image
A. `-F(hati+hatj)`
B. `F(hati+hatj)`
C. `-F(hati-hatj)`
D. `F(hati-hatj)`

A force of `-Fhatk` acts on O, the origin of the coodinate system. The torque about the point (1,-1) is
image
A. `-F(hati+hatj)`
B. `F(hati+hatj)`
C. `-F(hati-hatj)`
D. `F(hati-hatj)`
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1 Answer

  1. `vecr=hati-hatj`, `vecF= -Fhatk`
    `vectau=vecrxxvecF=(hati-hatj)xx(-Fhatk)`
    `= -F[hatixxhatk-hatjxxhatk]`
    `= -F[-hatj-hati]=F[hati+hatj]`

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