Two Motors in a Factory Are Running at Slightly Different

question 6

Multiple Choice

Two motors in a factory are running at slightly different rates.One runs at 825 rpm and the other at 786 rpm.You hear the sound intensity increase and then decrease periodically due to wave interference.How much time elapses between successive maxima of the sound intensity?

• A) 1.5 s
• B) 1.4 s
• C) 1.7 s
• D) 1.8 s

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Definitions:

Amortization Table

A schedule that details each payment on an amortizing loan (such as a mortgage), including how much of each payment is interest vs. principal and the remaining balance.

Semiannual Interest

Semiannual interest is interest that is calculated and paid twice a year on investments or loans.

Straight-Line Method

A depreciation technique that allocates an equal amount of depreciation expense over the useful life of an asset.

Semiannual Interest

Interest payments made twice a year on investments or loans.