Question

find the torque of a firce 7i+3j-5k about the origin r=i-j+k​

Answer 1

Answer:

Explanation:

Here r=  i ^-  j ^

^

 

and F=7  

i

^

+3  

j

^

​  

−5k.

We shall use the determinant rule to find the torque τ=r×F

τ=  

∣

∣

∣

∣

∣

∣

∣

∣

​  

 

i

^

 

1

7

​  

 

j

^

​  

 

−1

3

​  

 

k

^

 

1

−5

​  

 

∣

∣

∣

∣

∣

∣

∣

∣

​  

 =(5−3)  

i

^

−(−5−7)  

j

^

​  

+(3−(−7))  

k

^

 

or τ=2  

i

^

+12  

j

^

​  

+10  

k

^