A Fire Fighter Tightens the Nut on the Top of a Fire

question 39

Multiple Choice

A fire fighter tightens the nut on the top of a fire hydrant using a large wrench.If she applies a force of 250N perpendicular to the wrench,at a point 0.75m from the axis of rotation of the nut,how much work does she do on the nut as she rotates it through 45 $^{\circ}$ ?

• A) 190 J
• B) 150 J
• C) 290 J
• D) 130 J

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Definitions:

Physical Punishment

refers to the use of physical force with the intention of causing a child to experience pain, but not injury, for the purpose of correction or control.

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The reproductive organs, especially those external, involved in sexual reproduction and bodily pleasure.

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The act of investigating or traveling through new areas for discovery or examination.

Birth Control Pills

Oral contraceptives used to prevent pregnancy by inhibiting ovulation, thickening the cervical mucus, and thinning the uterine lining.