8. The needle of a record player moves 7.2 cm when playing a particular record. If the record makes 900 revolutions, find the width of

Question

8. The needle of a record player moves 7.2 cm when playing a particular record. If the
record makes 900 revolutions, find the width of the groove.​

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Josephine 3 days 2021-11-24T21:06:41+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-11-24T21:08:09+00:00

    Given :–

    • The needle of a record player moves when playing a particular record = 7.2cm.
    • Number of revolutions = 900

    To Find :–

    • Width of the groove.

    Solution :–

    So, here find the width of the groove =  \frac{Total \: distance \: covered \: by \: the \: needle}{No. \: of \: revolutions - 1}

     \frac{7.2}{900 - 1}

     \frac{7.2}{899}

     \frac{72}{899 \times 10}

     \frac{72}{8990}

     \frac{36}{4495}

    → 0.00801cm

    We know that,

    • 100 centimeters (cm) = 10,00,000 micrometer (um)

    And,

    • 1cm = 10,000 um

    So,

    For converting cm into um, we need to multiply the cm by 10000.

    I.e., 0.00801 × 10,000

    → 80.1 um

    0
    2021-11-24T21:08:30+00:00

    Answer:

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