Danny and Stacey Have Gone from the Swing to the Slide

question 51

Multiple Choice

Danny and Stacey have gone from the swing to the slide at the park. The slide is inclined at an angle . Danny weighs 39.0 pounds. He is sitting in a cardboard box with a piece of wax paper on the bottom. Stacey is at the top of the slide holding on to the cardboard box. Find the magnitude of the force Stacey must pull with, in order to keep Danny from sliding down the slide. (We are assuming that the wax paper makes the slide into a frictionless surface, so that the only force keeping Danny from sliding is the force with which Stacey pulls.) ​    ​

• A)37.8 lb
• B)31.1 lb
• C)26.5 lb
• D)22.7 lb
• E)29.8 lb

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Definitions:

Per Unit

A measurement specific to one unit of a good or service, indicating cost, price, or quantity related to a single unit.

Output

The total amount of goods or services produced by a company or country.

Input

Resources used in the production process, including labor, raw materials, and capital.

Marginal Revenue Product

The additional revenue generated from employing one more unit of a factor of production, such as labor.