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26 March, 08:14

The area of a telescope lens is 6.676 x 10 mm. (a) What is the area in square feet (ft) ? Enter your answer in scientific notation. x 10ft (b) If it takes a technician 51.7 s to polish 1.46 x 10mm', how long does it take her to polish the entire lens?

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  1. 26 March, 12:12
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    a) A = 7.186 E-4 ft²

    b) t = 236.403 s

    Explanation:

    A = 6.676 E1 mm²

    a) A = 6.676 E1 mm² * (ft / 304.8 mm) ²

    ⇒ A = 7.186 E-4 ft²

    b) t = 51.7 s → A = 1.46 E1 mm²

    ⇒ relation (r) = 6.676 E1 mm² / 1.46 E1 mm² = 4.573

    ⇒ t = 51.7 s * 4.573 = 236.403 s
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