Question

Find the torque about the origin due to a force F = ( 1.54 j + 2.77 k ) N acting at the point r = ( 3.91 i + 4.30 j ) m. Enter the torque in component form in N*m (do not enter units).

Answer 1

torque = F x r = (1,54 j + 2,77 k) x (3,91 i +4,3 j)
torque = (1,54x3,91)(jxi) + (2,77x3,91)(kxi) + (1,54x4,3)(jxj) + (2,77x4,3)(kxj)

jxi = k
kxi = -j
jxj = 0
kxj =i

Answer 2

so we'll find
torque = 11.9 i + 6,02 k - 10.83 j

Answer 3

You are amazing! Thank you!