The area of a telescope lens is 7.195 x 10^3 mm^2 A) What is the area...

Question

Question

The area of a telescope lens is 7.195 x 10^3 mm^2

A) What is the area in square feet (ft^2)? Enter your answer in scientific notation

B) If it takes a technician 47.8 seconds to polish 1.57 x 10^2 mm^2, how long does it take her to polish the entire lens?

Answer 1

Answer #1

A) 1 mm² = 1.076 × 10^-5 ft²

Area in square feet =7.195 × 1.076 × 10^-5 × 10³ ft²

= 7.742 × 10^-2 ft²

B) 1.57 × 10² mm² takes 47.8 seconds to polish.

7.195 × 10³ mm² takes 47.8×7.195×10³ /1.57×10² seconds

= 2190.6 seconds

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Answer 2

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