phys 1 - cho (hmc594) Homework 2 spurlock (31441) 1 This...

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Unformatted text preview: cho (hmc594) Homework 2 spurlock (31441) 1 This print-out should have 74 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The Washington Monument in the District of Columbia has a height of 555 ft, 5 in. Express this height in meters. Correct answer: 169 . 291 m. Explanation: 1 ft = 0.305 m and 1 in = 0.0254 m, so h = (555 ft) . 305 m 1 ft + (5 in) . 0254 m 1 in = 169 . 291 m . 002 10.0 points Convert 34 . 4 mi / h to m/s. 1 mi = 1609 m. Correct answer: 15 . 3749 m / s. Explanation: 1 mi = 1609 m 1 h = 3600 s (34 . 4 mi / h) 1609 m 1 mi 1 h 3600 s = 15 . 3749 m / s . 003 10.0 points The number x = 0 . 0268 has how many signif- icant digits? Correct answer: 3. Explanation: All non-zero digits are significant. Any zeros in front of the first non-zero digit are placeholders; zeros between non-zero digits are significant. 004 10.0 points Given braceleftbigg 10 x 6 y = 122 4 y 8 x = 36 Find x . Correct answer: 8. Explanation: 005 10.0 points Use the quadratic formula to solve 39 . 375 = 6 t 3 8 t 2 . What is the larger of the solutions? Correct answer: 21. Explanation: Rearranging the equation we get 3 8 t 2 6 t 39 . 375 = 0 3 t 2 48 t 315 = 0 t = ( 48) radicalbig ( 48) 2 4(3)( 315) 2(3) = 48 6084 6 . The larger solution is 48 + 6084 6 21 . 006 (part 1 of 2) 10.0 points In a certain right triangle, the two sides that are perpendicular to each other are 6 . 5 m and 6 . 9 m long. What is the length of the third side? Correct answer: 9 . 47945 m. Explanation: Given : l 1 = 6 . 5 m , and l 2 = 6 . 9 m . Using the Pythagorean Theorem, Hypotenuse = radicalBig l 2 1 + l 2 2 = radicalBig (6 . 5 m) 2 + (6 . 9 m) 2 = 9 . 47945 m . 007 (part 2 of 2) 10.0 points What is the tangent of the angle for which 6 . 5 m is the opposite side? Correct answer: 0 . 942029. cho (hmc594) Homework 2 spurlock (31441) 2 Explanation: When 6 . 5 m is the opposite side, 6 . 9 m is the adjacent, and tan = l 1 l 2 = 6 . 5 m 6 . 9 m = . 942029 . 008 10.0 points The figure shows a rhombus whose sides are 20 . 8 cm long. The angle is 38 . 6 . A B C D E Find the distance from A to B. Correct answer: 4 . 54438 cm. Explanation: In the rhombus ACDE ( B is on the side AC ), we know that the length of each side is equal, AC = CD = S = 20 . 8 cm cm long and the angle negationslash BCD is = 38 . 6 . In the triangle BCD , we have BC = DC cos so AB = AC BC = S S cos = S (1 cos ) 009 (part 1 of 2) 10.0 points While John is traveling along a straight inter- state highway, he notices that the mile marker reads 250 km. John travels until he reaches the 147 km marker and then retraces his path to the 161 km marker....
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phys 1 - cho (hmc594) Homework 2 spurlock (31441) 1 This...

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