HW01-solutions

HW01-solutions - sela (ds39632) – HW01 – janow –...

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Unformatted text preview: sela (ds39632) – HW01 – janow – (11196) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points How many square meters are in 2 . 6 acres? There are 640 acres in a square mile. Correct answer: 10517 . 3 m 2 . Explanation: Let : A = 2 . 6 acres . A = (2 . 6 acres) · 1 mi 2 640 acres · parenleftbigg 1609 m 1 mi parenrightbigg 2 = 10517 . 3 m 2 . 002 10.0 points For the given triangles, a = 12 m, b = 8 . 99 m, and α = 53 . 5 ◦ . a b α θ Find θ . Correct answer: 33 . 6662 ◦ . Explanation: Let the common side be x . a b x α θ In the triangle on the left, tan α = x a x = a tan α , and in the triangle on the right, sin θ = b x = b a tan α θ = arcsin parenleftbigg b a tan α parenrightbigg = arcsin bracketleftbigg 8 . 99 m (12 m) tan53 . 5 ◦ bracketrightbigg = 33 . 6662 ◦ . 003 10.0 points Convert the volume 6 . 61 in . 3 to m 3 , recalling that 1 in. = 2.54 cm and 100 cm = 1 m. Correct answer: 0 . 000108318 m 3 . Explanation: V = ( 6 . 61 in . 3 ) parenleftbigg 2 . 54 cm 1 in parenrightbigg 3 parenleftbigg 1 m 100 cm parenrightbigg 3 = . 000108318 m 3 . 004 (part 1 of 3) 10.0 points A girl delivering newspapers travels 2 blocks west, 8 blocks north, then 5 blocks east....
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This note was uploaded on 03/09/2012 for the course PHYS 111 taught by Professor Moro during the Spring '08 term at NJIT.

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HW01-solutions - sela (ds39632) – HW01 – janow –...

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