Gertrude is changing a flat tire with a tire iron. The tire iron is positioned on one of...

Gertrude is changing a flat tire with a tire iron. The tire iron is positioned on one of the bolts of the wheel so

that it makes an angle of 30^? with the horizontal. (See Figure 1.68.) Gertrude exerts 40 lb of force straight down to turn the bolt. (a) If the length of the arm of the wrench is 1 ft, how much torque does Gertrude impart to the bolt? (b) What if she has a second tire iron whose length is 18 in?