Decide Whether the Expression Is or Is Not an Identity $\theta _ { \mathrm { S } }$

question 269

Multiple Choice

Decide whether the expression is or is not an identity.
-A wooden block sitting at rest on a flat, level board will just begin to slide when the board is tilted up to a critical angle of inclination, $\theta _ { \mathrm { S } }$ . An experiment that determines this critical angle can be used to find the coefficient of static friction, $\mu _ { \mathrm { S } }$ , for the block on the board by using the relation $\mu _ { \mathrm { S } } = \frac { \sin \theta _ { \mathrm { S } } } { \cos \theta _ { \mathrm { S } } }$ . Rewrite this relation using a quotient identity.

• A) \(\mu _ { \mathrm { S } } = \cot \theta _ { \mathrm { S } }\)
• B) \(\mu _ { \mathrm { S } } = \sec \theta _ { \mathrm { S } }\)
• C) \(\mu _ { \mathrm { s } } = \tan ^ { 2 } \theta _ { \mathrm { s } }\)
• D) \(\mu _ { \mathrm { S } } = \tan \theta _ { \mathrm { S } }\)

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The cost associated with the consumption of supplies used in the operation of a business.

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A journal entry made at the end of an accounting period to allocate income and expenditure to the appropriate period.

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Items or materials kept on hand by a business for the production process or for sale.

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Money received by a business for goods or services yet to be provided, recorded as a liability until earned.