Home
Class 11
PHYSICS
A force of -Fhatk acts on O, the origin ...

A force of `-Fhatk` acts on O, the origin of the coodinate system. The torque about the point (1,-1) is

A

`-F (hati + hatj)`

B

`F (hati + hatj)`

C

`-F (hati - hatj)`

D

`F (hati - hatj)`

Text Solution

Verified by Experts

The correct Answer is:
B
Here, `overset rarr(F) =- F hatk`
`overset rarr(r ) = (hati - hatj)`
`overset rarr(tau) = overset rarr(r ) xx overset rarr(F) = (hati - hatj) xx (-F hatk)`
`-F (hati xx hatk - hatj xx hatk) = - F(-hatj - hati)`
`overset rarr(tau) = F (hati + hatj)`
Promotional Banner

Similar Questions

Explore conceptually related problems

A force of -Fhatk actgs on O, the origin of the coodinate system. The torque about the point (1,-1) is

A force of -4Fhat(K) acts O, the origin of the coordinate system. The torque about the point (1,-1) is

A force of - F hat k on O , the origin of the coordinate system. The torque about the point (1, -1) is. .

A force Fhatk acts on O, the origin of the coordinate system. The torque of this force about the point is: (1,-1) is

Torque about O & Q

A single force acts on a particle situated on the negative x-axis. The torque about the origin is in the positive z-direction. The force is

A particle is placed at the origin of the coordinate system. Two forces of magnitude 20N & 10N act on it as shown in figure. It is found that it starts moving towards the point (1,1) . The net unknown force acting on the particle at this position can be :

Force hati + 2hatj -3hatk , 2hati + 3hatj + 4hatk and -hati - hatj + hatk are acting at the point P(0,1,2) . The moment of these forces about the point A(1,-2,0) is