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Q. What is the size of the smallest vertical plane mirror in which a 10.0 tall giraffe standing erect can see her full-length image? (Hint: Locate the image by drawing a number of rays from the giraffe's body that reflect off the mirror and go to her eye. Then eliminate that part of the mirror for which the reflected rays do not reach her eye.)

Q. If a mechanic tightens the spark plug with a wrench that is 31 {rm cm} long, what is the minimum force necessary to create the desired torque? if a mechanic tightens the spark plug with a wrench that is 31 {rm cm} long, what is the minimum force necessary to create the desired torque?

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