Question

A wrench .9m long lies along the positive y-axis, and grips a bolt at the origin. A force is applied in the direction of (0,1,3) at the end of the wrench. Find the magnitude of the force in newtons needed to supply 100 J of torque to the bolt.
This is the formula i have:
T=|r x F| Can anybody point me in the right direction?

Answer 1

T=100J
r=.9j
F=F (0i+1j+3k)/sq root 1^2+3^2)

Replace the values on the formula and solve for F.

Answer 2

A wrench 0.4 meters long lies along the positive y-axis, and grips a bolt at the origin. A force is applied in the direction of ⟨0,1,5⟩ at the end of the wrench. Find the magnitude of the force in newtons needed to supply 100 newton-meters of torque to the bolt.