PHYS1211 Exam 2 - University Of Georgia CHEM 1212

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Midterm Exam #2 Instructions: This is a closed-book, closed-notes exam. You may consult the colored sheet of formulas and numerical data that you’ve been provided with, but it is not part of the ... exam. Do not hand it in with your exam, as nothing written on it will be graded. Space is provided after each question to show your work. If you need more space, you may use the back of the page or request more paper. Please clearly indicate where your work for each problem is. Underline or draw a box around your final answer. The exam consists of five sections. I recommend that you read all the questions at the start, so that you can allocate your time wisely. You may use a scientific calculator for arithmetic only. Your calculator must be nongraphing, non-programmable, and non-algebraic. You may not share your calculator. The use of cell phones, PDAs, or any other electronic devices (besides calculators) is prohibited. All such gadgets must be turned off and put away throughout the exam. • Do not open the exam until told to begin. • You have one class period (75 minutes) to finish the exam. • You should put your initials or last name on every page of the exam. • You must provide explanations and/or show work legibly to receive full credit on Sections III-V. • Make sure your answers include appropriate units and significant digits. (Note: For intermediate steps, it is wise to carry around more significant digits.) • Assume that air resistance is negligible for all questions. By signing below, you indicate that you understand the instructions for this exam and agree to abide by them. You also certify that you will personally uphold the university’s standards of academic honesty for this exam and will not tolerate any violations of these standards by others. Unsigned exams will not be graded. Print name: SOLUTION Signature: UGA Card #: I II III IV V Bonus Raw Total Scaled Total March 10, 2011 Initials: (2) Section I: [15 points] The six figures below labeled A-F are of blocks held stationary against a vertical wall by a horizontal pushing force. (a) Rank the blocks on the basis of magnitude of the normal force acting on them. Place the letter corresponding to the block with the greatest normal force acting on it in the leftmost box below, and continue in decreasing order to the right. If two blocks have the same normal force, put their letters in the same box. It’s possible that some boxes will be left blank. That’s OK; only the relative rank order matters. Greatest [Please use capital letters] Least B, F C, E A D (b) Rank the blocks on the basis of magnitude of the static friction force acting on them. Place the letter corresponding to the block with the greatest friction force acting on it in the leftmost box below, and continue in decreasing order to the right. If two blocks have the same friction force, put their letters in the same box. It’s possible that some boxes will be left blank. That’s OK; only the relative rank order matters. Greatest [Please use capital letters] Least A, F C D, E B March 10, 2011 Initials: (3) Section II: [16 points] Multiple choice questions. Enter your answer in the box provided, using capital letters. 1. Two objects are simultaneously launched into the air from ground level. Object A is launched vertically upward, and object B is launched at an angle (something between horizontal and vertical). Both objects reach the same maximum height above ground. Ignoring air resistance, which of the following statements is true? (A) Both objects hit the ground at the same time. (B) Both objects have the same launch speed. (C) Both objects have zero velocity at the top of their motion. (D) All of the above. (E) None of the above. 2. Two objects are simultaneously launched into the air from ground level. Object A is launched vertically upward, and object B is launched at an angle (something between horizontal and vertical). Both objects have the same launch speed. Ignoring air resistance, which of the following statements is true? (A) Both objects hit the ground at the same time. (B) Both objects reach the same maximum height above ground. (C) Both objects have zero velocity at the top of their motion. (D) All of the above. (E) None of the above. 3. A rock of mass m is suspended from a string attached to the ceiling of an elevator. The elevator is accelerating downward. Which of the following statements concerning the tension in the string is true? (A) The tension is less than mg. (B) The tension is equal to mg. (C) The tension is greater than mg. (D) The tension is independent of mg. (E) Not enough information is given. 4. Which of the following statements is always true? (A) The horizontal component of acceleration is zero. (B) An object cannot move in a circle unless it is accelerating. (C) Astronauts in space are weightless because they are out of the Earth’s gravity. (D) The static friction force on a stationary object is µsn, where n is the normal force. (E) All of the above [Show More]

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