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3rdLE_2007_summer_SampleExam

# 3rdLE_2007_summer_SampleExam - National Institute of...

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University of the Philippines College of Science PHYSICS 71 Summer 2007 3 rd Long Examination National Institute of Physics 3 rd Long Examination Physics 71 A-2 INSTRUCTIONS: Choose the best answer. Ignore air resistance and friction, unless otherwise stated in the question. Acceleration due to gravity is 9.8 m/s 2 . 1. StatEq Conditions. Which of the following are necessary conditions to attain static equilibrium? I. The object should be stationary or moving at constant speed. II. The net external force on the system should be zero. III. The net external torque on the system should be constant. A. I only B. II only C. III only D. II and III only E. I, II and III 2. Center of Gravity. Which of the following statements is NOT NECESSARY regarding center of gravity (Assumptions are made on the surface of the Earth, where acceleration due to gravity is approximately constant.)? I. The center of gravity always coincides with the center of mass. II. The center of gravity is always at the geometric center of a body. III. There must be material at the center of gravity of an object. 3. StatEq Rod. One end of a rod is tied to the ceiling by a rope. The other end rests on a frictionless surface. What is the best configuration for the rod to be in static equilibrium?

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National Institute of Physics 3 rd Long Examination Physics 71 A-3 cg cg 1.0 m 1.0 m 1.0 m 4. Watis Leverarm. Two masses (rectangle and triangle) are placed on a uniform seesaw which is pivoted at the center. The lever arm of rectangle is _______ and that of triangle is ______. 5. Stateq or Not? A body is subject to three forces: F 1 = 2i + 2j N, applied at the point x = 2m, y=0 m; F 2 = -2i – 3j N, applied at x = -1m, y=0; and F 3 = 1j N, applied at x = -7m, y= 1m. What is TRUE regarding the body? A. It is in static equilibrium. B. The center of mass is at rest but the body is rotating. C. The center of mass is accelerating but the body is not rotating. D. The body is both accelerating and rotating. E. The body is moving with constant velocity but is not rotating. 6. Child and Scale. A 60-kg uniform board 2.4 m long is supported by a pivot 0.80 m from the left end, and the scale at the right end. Where should the 40- kg child in the figure sit if the scale is to read 0 N? A. 0.53 m B. 0.27 m C. 0.80 m D. 0.60 m E. 0.21 m pivot scale National Institute of Physics 3 rd Long Examination Physics 71 A-4
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3rdLE_2007_summer_SampleExam - National Institute of...

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