You Do 174 J of Work While Pulling Your Sister

question 34

Multiple Choice

You do 174 J of work while pulling your sister back on a swing,whose chain is 5.10 m long.You start with the swing hanging vertically and pull it until the chain makes an angle of 32.0° with the vertical with your sister is at rest.What is your sister's mass,assuming negligible friction?

• A) 22.9 kg
• B) 19.5 kg
• C) 26.3 kg
• D) 28.4 kg

---

Definitions:

Spinal Cord

A long, thin, tubular bundle of nervous tissue and support cells that extends from the brain, forming the central part of the nervous system and connecting the brain to the body.

Schwann Cells

Neuroglial cells whose cell membrane coats the axons.

Myelin

A fatty substance that forms a sheath around the axons of many neurons, serving as insulation and speeding up the transmission of nerve impulses.

Muscle Weakness

A decrease in the strength of one or more muscles, which can result from a wide range of diseases, disorders, or conditions.