Three Children Are Pulling on a Rotatable Platform on a Playground

question 44

Multiple Choice

Three children are pulling on a rotatable platform on a playground. The platform has a radius of 3.80 m. In the picture, two children are pulling with equal forces of 40.0 N in an attempt to make the platform rotate clockwise. The third child applies a force of 60 N as shown. What is the net torque on the platform? Note: "ccw" is counterclockwise and "cw" is clockwise.

• A)76 N . m, ccw
• B)76 N . m, cw
• C)290 N . m, ccw
• D)290 N . m, cw
• E)0 N . m

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Definitions:

Technological Efficiency

A state of production where a business cannot produce more of one good without lowering the production level of another good, given current technology.

Import Protection

Measures by a government to restrict foreign imports to protect domestic industries.

Import Quotas

Restrictions set by a country on the amount or volume of goods that can be imported into the country over a set period of time.

Consumer Surplus

The discrepancy between what consumers are prepared to spend on a good or service and what they end up paying.