# Q1 - Physics 7B - Winter 07 - Quiz 1 Name_ DL section...

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Physics 7B - Winter 07 - Quiz 1 ﬁrst two letters of last name Name________________________ Student ID___________________ DL section number _________ I certify by my signature that I will abide by the code of academic conduct of the University of California Signature _____________________________ No books or notes. Calculators OK. Show all of your work below - answers alone do not receive credit! 1. (3.0 pts) Let us use a vector notation of the form (x,y), where x is the x-component of the vector and y is the y component. Draw accu- rately and label on the grid at right these vectors: A = (-3,5) B = (4,-1) A-B 2. a. (1.0 pts) A ball hits a wall at a 45 ° angle and bounces off such that its new direction is 90° to the original direction, as shown in the drawing at left. Indicate the direction of the impulse vector on the ball on the ﬁgure. b. (0.5 pts) If the ball s mass is 2 kg and it initially travels at 1 m/s, what is the magnitude of the impulse? Show your work below.

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1. (3.0 pts)
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## Q1 - Physics 7B - Winter 07 - Quiz 1 Name_ DL section...

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