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CT3-1 Can two vectors of unequal magnitude sum to zero? That is, if A B�rr, can A B 0+ =rr?A) Yes. B) No.CT3-2 Can three vectors of equal magnitude sum to zero? That can A B C 0+ + =r rr, if A B C= =r rrA) Yes. B) No.CT3-3Vectors C and ,B,A sum to zero, which meansA B C 0+ + =r rr. Vectors B and A are at right angles to each other (A B^rr). What is C C=r?A) A+B B) A–BC) 22BA D) Impossible to tell from the information given.CT3-4Three vectors  A B and C, , are as shown. Which vector is   S A B C  ?(A) (B) (C) (D)ABC(E) None of these.CT3-5The solid line has length A and makes an angle  with the negative y-axis. What is the length of the dotted line?A) A cosB) A sinC) A tanD) sin/AE) cos/ACT3-6What is the correct formula for Ay, the y-component of the vector A?A) +A cosB) +A sinC) –A cosD) –A sinE) None of these.xyAxyACT3-7 The vectors A, B, and Cr rr are shown. The vector sum of these three vectors is S = A + B + Cr r rrWhat is the value of Sx, the x-component of Sr?A) +2B) – 4C) – 2D) +3E) None of theseWhat is Sy , the y-component of S? (Same choices)A C BCT3-8The position vector of a particle moving with constant velocity is shown below at two different times, an earlier time t1 and a later time t2. Which arrow shows the direction of the velocity vector? (A) (B) (C) (D)(E) None of these!R1R2CT3-9The velocity vector of a particle moving with constant accelerationis shown below at two different times, an earlier time t1 and a later time t2. What is the direction of the acceleration vector?(A) (B) (C) (D)(E) None of these!V1V2CT3-10 Which diagram below correctly depicts the equation1 2v v v+D =r r r?A)vv1v2B)vv1v2C)vv1v2D) all three (A,B,C) are correctE) None (A,B,C) are correctCT3-11 Which one equation below makes no sense?A) �A jurB) � � �B 3i j 5j  urC) � �C 3i 4j urD) �C A i ur urE) All equations above are OK.CT3-12Two stones are dropped into a bottomless pit, the second stone is dropped 2 seconds after the first stone. Assume no air resistance. As both stones fall, the difference in their heights (y-positions)..A) increases B) decreasesC) remains constantAs both stones fall, the difference in their velocities..A) increases B) decreasesC) remains constantOn the PhET sim Lunar Lander, which arrow is velocity and which is acceleration?A) green is velocity, yellow is accelerationB) yellow is velocity, green is accelerationC) both are velocityD) both are accelerationE) one of the arrows is velocity, but the other arrow is something other than


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CU-Boulder PHYS 2010 - Questions

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