A 320-G Ball and a 400-G Ball Are $0.00070 \mathrm {~N} \cdot \mathrm { m }$

question 10

Multiple Choice

A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate. What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released?

• A) \(0.00070 \mathrm {~N} \cdot \mathrm { m }\)
• B) \(0.61 \mathrm {~N} \cdot \mathrm { m }\)
• C) \(0.068 \mathrm {~N} \cdot \mathrm { m }\)
• D) \(0.063 \mathrm {~N} \cdot \mathrm { m }\)
• E) \(0.079 \mathrm {~N} \cdot \mathrm { m }\)

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Definitions:

Eyeball

The sphere-shaped organ of vision contained within the orbit of the skull.

Palpebrae

The medical term for eyelids, serving as protective covers for the eyes that help moisturize and clean the ocular surface through blinking.

Lacrimal Caruncle

A small, flesh-colored nodule at the inner corner of the eye, responsible for producing mucus and oil to lubricate the eye.

Tears

The liquid produced by the lacrimal glands to lubricate, clean, and protect the eyes from irritation and infection.