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x_Sample Exam 1 for P125

# x_Sample Exam 1 for P125 - Physics 125 Answer key is on the...

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1 Physics 125 * Answer key is on the last page (no peeking until you really try it!) Previous Exam #1 Mesa Name: ______________________ This quiz will be closed book. You may only use a calculator. Please do not make any phone calls during this quiz. Please have your phone turned off and put away. If your phone rings or buzzes during the quiz, you may be asked to leave early. There are 25 multiple choice questions, 2 problems, and one bonus question. Although partial credit will not be given for the multiple choice questions, you must show your work and calculations for those that require numerical calculation . You must use the conventional notation that was used in class. If your work is not neat and organized, and I cannot follow your logic, then you will not receive full credit. Use mks units unless otherwise asked. If you have time in the end, you should go back and recheck your answers. Remember, no work or bad physics = no credit. Take your time and relax! If there is something that is not clear, please ask. For best results, do not round off numbers in intermediate calculations. Complete solutions must include: 1) Diagram with the given information shown on it. All diagrams must be fully labeled. 2) Physics equations being used. 3) Substitution showing given values and units. 4) Answer or result in the box! ** use g = 9.8 m/s 2 unless instructed otherwise ** *** Please mark your answers on the provided scantron and this quiz paper . You are responsible for your final answers. hypotenuse opposite sin = θ hypotenuse adjacent cos = θ adjacent opposite tan = θ v f = v o + at x f = x o + v o t + ½ at 2 v f 2 = v o 2 + 2a x (for motion in one-dimension with constant acceleration) t d s = t x v = t v a = (3 Points Each) 1. Cody is driving his new turbo-car East to West along the highway when he applies the brakes. His a. velocity and acceleration are both East. b. velocity and acceleration are both West. c. velocity is West and its acceleration is East. d. velocity is East and its acceleration is West. 2. If you drop an object in the absence of air resistance, it accelerates downward at 9.81 m/s 2 in magnitude. If instead you throw it downward, the magnitude of its downward acceleration after release is (again, ignore air resistance) a. less than 9.81 m/s 2 . b. 9.81 m/s 2 . c. more than 9.81 m/s 2 . d. none of the above hypotenuse adj op θ

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2 3. A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff having the greater impact speed is the one initially thrown a. upward. b. downward. c. neither—they both hit at the same speed.
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