A Ball That Is Bobbing Up and Down on the End

question 12

Multiple Choice

A ball that is bobbing up and down on the end of a spring has a maximum displacement of 3 inches.Its motion (in ideal conditions) is modeled by? $y = \frac { 1 } { 4 } \cos 18 t ( t > 0 )$ where y is measured in feet and t is the time in seconds. What is the period of the oscillations?
?

• A) \(\frac { 9 } { \pi }\)
• B) \(\frac { 18 } { \pi }\)
• C) \(\frac { \pi } { 18 }\)
• D) \(\frac { \pi } { 2 }\)
• E) \(\frac { \pi } { 9 }\)

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Definitions:

Installment Method

An accounting technique for recognizing revenue and expenses from sales made on credit in proportion to the payments received, rather than at the time of sale.

Deferred Gross Profit

Profit from sales transactions not yet recognized in the income statement, typically because the revenue recognition criteria have not been fully met.

Installment Receivables

Money owed to a company from its customers who have purchased goods or services on a payment plan over a set period of time.

Realized Gross Profit

The total earnings a company makes after deducting the direct costs associated with producing its goods or services.