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Unformatted text preview: Physics 2A Quiz 1 answer key
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C A E D A A D UCSD Physics 2A Winter 2007 Instructor :Vivek Sharma Quiz One
INSTRUCTIONS: Fill, tear and return the bottom strip of the front page with your scantron. Keep the top portion of the front page and the rest of the quiz. 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 AL at bottom of page) in your scantron under ""TEST VERSION"".
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is an accurate statement? A) If the vectors A and B are each rotated through the same angle about the same axis, the product A x B will be unchanged. B) If a vector A is rotated about an axis parallel to vector B, the product A B will be changed. C) If the vectors A and B are each rotated through the same angle about the same axis, the product A B will be unchanged. D) When a scalar quantity is added to a vector, the result is a vector of larger magnitude than the original vector. E) If vectors A and B are both rotated through the same angle about the axis, the sum of A + B will not be changed. 2) If a  b =2 c , a + b =4 c and c =3 i +4 j then the magnitude of a is closest to: A) 4 B) 15 C) 10 D) 1 3) Under what condition is A  B = A + B ? A) The magnitude of vector B is zero. B) Vectors A and B are in opposite directions. C) Vectors A and B are in the same direction. D) Vectors A and B are in perpendicular directions. E) both A and B 4) Two vectors are given as follows: B = 2 i  4 j + 2 k C = 5 i 2 j  3 k The magnitude of C B is closest to: A) 24 B) 16 C) 20 D) 28 E) 12 Tear here and submit strip along with the scantron card. Follow TA instructionsName____________________________________________CodeNumber___________________ Quiz One Version A1 UCSD Physics 2A Winter 2007 Instructor : Vivek Sharma Quiz One
5) Using your knowledge of the diameter of a roll of toilet paper and number of sheets on a roll, estimate the thickness of a (clean) sheet of toilet paper. A) a few hundredths of a millimeter B) a few billionths of a meter C) a few centimeter D) a few tenthousandths of a millimeter E) a few millimeter 6) .Vector A has magnitude A=5.00 and makes an angle A=26.0o measured in the sense from +xaxis towards the +yaxis, B has B=4.00 and B=63.0o and C has magnitude 6.00 and points in the +z direction. Vectors A & B are in the xyplane. The product ( A B ) C is closest to: A) 120.0 B) 72.2k
^ C) 12.00 D) 72.2 7) Two vectors are given as follows: B = 2 i  6 j + 2 k C = 2 i 2 j  3 k The angle between vectors B and C , in degrees, is closest to: A) 144 B) 69 C) 90 D) 36 E) 111 Quiz One Version A2 Answer Key Testname: Q1 1) C
ID: UP11 1.128 2) B
ID: USER4 3) E
ID: pse3f 1.6.12 4) D
ID: UP11 1.121 5) A
ID: pse3f 1.5.27+ 6) D
ID: USER3 7) B
ID: UP11 1.118 Tear here and submit strip along with the scantron card. Follow TA instructionsName____________________________________________CodeNumber___________________ Quiz One Version A3 ...
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This note was uploaded on 05/22/2008 for the course PHYS 2A taught by Professor Hicks during the Winter '07 term at UCSD.
 Winter '07
 Hicks
 Physics

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