quiz2 - UCSD Physics 2A Fall 2008 Instructor : Vivek Sharma...

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Unformatted text preview: UCSD Physics 2A Fall 2008 Instructor : Vivek Sharma Quiz Two INSTRUCTIONS: Enter your name and code # in the bottom strip of the first page. Return the entire set of exam sheets with your scantron . Use a #2 pencil to fill your scantron. Write your code number and bubble it in under ““EXAM NUMBER””. Bubble in the quiz version (see letter A--H at bottom of page) in your scantron under ““ EXAM VERSION””. Since Scantron accepts only letter A-D, those with exam versions E-H should enter corresponding letter from A-D in their scantron card. Ask the proctor if you need clarification. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When multiplying several quantities, the number of significant digits in the result must always be A) equal to the number of significant digits in the most accurate of the quantities. B) equal to the number of significant digits in the least accurate of the quantities. C) equal to the average number of significant digits in the most and least accurate of the quantities. D) larger than the number of significant digits in the most accurate of the quantities. E) smaller than the number of significant digits in the least accurate of the quantities. 2) Two vectors are given as follows: B = - 2 i - 5 j + 2 k C = - 4 i - 2 j - 3 k The magnitude of C × B is closest to: A) 21 B) 25 C) 29 D) 17 E) 13 3) Vector A has magnitude A =5.00 and makes an angle θ A=26.0o measured in the sense from +x - axis towards the +y- axis, B has B = 4.00 and θ B = 63.0o and C has magnitude 6.00 and points in the +z direction. Vectors A & B are in the xy- plane. The product ( A × B ) · C is closest to: A) 120.0 B) 72.2 C) 12.00 D) 72.2k ^ E) 36.1 4) To a good approximation, your body consists mainly of water. One mole (mol) of water, which consists of about 6× 1023 molecules, has a mass of 18g. Assuming that the molecules of water in your body are closely packed together like cubes, what is the rough size of a water molecule ? A) 5 × 10- 10 m B) 5 × 10- 8 m C) 5 × 10- 11 m 5) If A + B 2 = A2 + B2 A) A and B are parallel B) A and B are anti - parallel C) Either A or B must be zero D) The angle between A or B must be 60 o E) None of these is true D) 1 × 10- 9 m Enter Your name and Code number Name____________________________________________Code-Number___________________ Phys 2A Quiz Two Exam Version A‐1 UCSD Physics 2A Fall 2008 Instructor : Vivek Sharma 6) Four vectors ( A , B , C, D ) have the same magnitude. The angle θ between adjacent vectors is 45 o as shown. Which of the following statements is true? A) A - B - C + D =0 B) B + D - 2 C =0 C) A + B + C + D =0 D) ( A + C )/ 2 = - B E) A + B = B + D 7) Let R = S × T and φ ≠ 90o , where φ is the angle between S and T when they are drawn with their tails at the same point. Which of the following is not true? A) R = S . T sinφ B) - R = T × S C) R · S =0 D) T · S =0 E) R · T =0 8) If the x component of a vector A in the xy plane, is half as large as the magnitude of the vector, the tangent of the angle between the vector and the x axis is: B) 1/2 C) 3 /2 D) 3 E) 3/2 A) 3 Phys 2A Quiz One Test Version A‐2 Quiz 2 Answer Key Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Version A Version B B E C B A E B D A C D B E A C E Version C Version D Version E Version F C C B E B E D D C B E D C A A D A E D B A A A E D A D D E A E D Version G Version H E A E E A D B A B A C C D A E E ...
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