Question

if f=2i+j+2k, r=i+j+2k find torque.​

Answer 1

Answer:

torque = k Nm

Explanation:

the formula of torque is ...torque =f×r

=(2i+j+2k)×(i+j+2k)

.:i×i=j×j=k×k=0

and i×j =k..j×k=i..k×i=j so

=2i×(i+j+2k) +j×(i+j+2k)+2k×(i+j+2k)

=(2i×i+2i×j+2i ×k)+(j×i +j×j+j×2k) +(2k×i +2k×j+2k×2k)

=(0+2k+(-2j)) +(-k +0+2i)+(2j+(-2i)+0)

=2k -2j -k +2i +2j -2i

=k Nm

hope it will help