A wrench with a length of #20 cm# is being used to unscrew a #4/3 cm# bolt. If a torque of #5 Nm# is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?
It seems that some information might be missing or entered incorrectly.
However, it says that a torque of 5Nm is needed to overcome the friction keeping the bolt in place. Overcoming friction is all that is needed to unscrew the bolt.
I hope this helps,