UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics
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1 UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics MIDTERM TEST #3 January 29, 2004 Time: 90 minutes NAME: (Last) Please Print (Given) STUDENT NO.: LECTURE SECTION (please circle): INSTRUCTIONS: 01 Dr. A. Robinson 02 B. Zulkoskey 03 Dr. K. McWilliams C15 F. Dean 1. You should have a test paper, a formula sheet, and an OMR sheet. The test paper consists of 9 pages. It is the responsibility of the student to check that the test paper is complete. 2. Enter your name and STUDENT NUMBER on the OMR sheet. 3. The test paper, the formula sheet and the OMR sheet must all be submitted. 4. The test paper will be returned. The formula sheet and the OMR sheet will NOT be returned. PLEASE DO NOT WRITE ANYTHING ON THIS TABLE QUESTION NO. MAXIMUM MARKS MARKS OBTAINED Part A 10 Part B 10 C1 5 C2 5 C3 5 TOTAL 35 continued on page 2...
2 January 29, 2004; Page 2 PART A FOR EACH OF THE FOLLOWING QUESTIONS IN PART A, ENTER THE MOST APPROPRIATE RESPONSE ON THE OMR SHEET. A1. Which one of the following statements concerning an object undergoing simple harmonic motion is FALSE? (A) The object has a maximum velocity when it is at the equilibrium position. (B) The object s acceleration has a maximum magnitude at the points of maximum displacement. (C) The object has a velocity of zero at the points of maximum displacement. (D) The object has a constant velocity. (E) The object has a displacement which has a sinusoidal variation with time. A2. A simple pendulum has a frequency of f 1 when on the earth. The same pendulum is taken to the moon, where it has a frequency f 2. What is the relationship between f 2 and f 1, given that the acceleration due to gravity on the moon is one-sixth that on the earth? f1 f1 (A) f 2 = 6 f 1 (B) f 2 = ( 6) f 1 (C) f 2 = (D) f 2 = (E) f 2 = 36 f1 6 6 A3. A raft of total mass M kg and area A m 2 is floating in water (density ρ kg/m 3 ). A distance h metres of the raft is below the water line. Which one of the following relationships is correct? (A) M = Ahρ (B) M = ρa (C) M ρ g hρ = (D) M = (E) M = gh Ah Ahρ A A4. An incompressible viscous fluid flows through a pipe of length L and radius R. The pressure difference between the ends of the pipe is P and the volume flow rate is Q. If the same fluid were to flow through a pipe of length L and radius ½R, and the pressure difference were doubled, the new volume flow rate would be (A) Q (B) ½Q (C) 2Q (D) Q / 8 (E) Q / 16 A5. When a sound wave with a frequency of 256 Hz interferes with a sound wave with a frequency of 289 Hz, the resulting beat frequency is (A) 1 Hz (B) 33 Hz (C) 11 Hz (D) 16.5 Hz (E) 5.5 Hz A6. Two speakers, separated by a distance d, are vibrating in phase and producing sound of identical frequency, f, and wavelength, λ. A listener wishes to position herself at a location of constructive interference. If her distance from one of the speakers is l, which one of the following choices for her distance from the other speaker will ensure that she is at a position of constructive interference? (A) l + d (B) l d (C) l + λ (D) l ½λ (E) d + λ continued on page 3...
3 January 29, 2004; Page 3 A7. Two spherical conductors of equal size are held 1 m apart on an insulating table. The charge on sphere A is +2Q and the charge on sphere B is 4Q. The spheres are now allowed to touch and are then put back to their original locations. Which one of the following statements is correct concerning the nature of the electrostatic force between the spheres prior to touching, and the spheres charges after touching? (A) initially attractive force; after touching: q A = 0, q B = 2Q (B) initially attractive force; after touching: q A = Q, q B = Q (C) initially attractive force; after touching: q A = +3Q, q B = 3Q (D) initially repulsive force; after touching: q A = Q, q B = Q (E) initially repulsive force; after touching: q A = 2Q, q B = 0 A8. Two point charges +Q and +5Q are located at points A and B as shown. Consider a point charge Q. Which of the following statements is true concerning where Q can be placed so that it feels no net electrostatic force? (A) Q is at equilibrium to the left of A. (B) Q is at equilibrium between A and B, closer to A. (C) Q is at equilibrium to the right of B. (D) Q is at equilibrium between A and B, closer to B. (E) Q would not achieve equilibrium in this system. A9. An electron traveling horizontally enters a region where a uniform electric field is directed upward, as shown in the diagram. What is the direction of the force exerted on the electron once it has entered the field? (A) to the left (B) to the right (C) upward (D) downward (E) into the page, away from the reader A10. A potential difference of 10 V is maintained between two parallel plates. If a proton is released from rest at the positive plate, its kinetic energy when it reaches the negative plate will be (A) ev. (B) 10 ev. (C) 10 J. (D) 10 W. (E) C. continued on page 4...
4 January 29, 2004; Page 4 PART B FOR EACH OF THE FOLLOWING PROBLEMS, WORK OUT THE SOLUTION IN THE SPACE PROVIDED AND ENTER YOUR ANSWERS ON PAGE 6. ONLY THE ANSWERS WILL BE MARKED. THE SOLUTIONS WILL NOT BE MARKED. B1. A small mass of kg is attached to a horizontal ideal spring and is vibrating horizontally across a frictionless table. The spring has a spring constant of 345 N/m. Calculate the total mechanical energy of the system when the mass is displaced m from the unstrained position of the spring and the speed of the mass is m/s. B2. An open container of height m is full to the top with maple syrup. The pressure at the bottom of the container is Pa. Calculate the density of maple syrup, if atmospheric pressure is Pa. continued on page 5...
5 January 29, 2004; Page 5 B3. A police car is in hot pursuit of a carload of bank robbers. The police car is travelling at a speed of 50.0 m/s with its siren blaring and the robber s car is travelling at a speed of 45.0 m/s. If the siren produces a sound wave with a frequency of 980 Hz, calculate the frequency of the siren sound wave that the robbers hear. The speed of sound in air is 343 m/s. B4. The human ear canal can be considered to be like an organ pipe that is closed at one end (at the eardrum) and open at the other. A typical ear canal has a length of m. Calculate the fundamental frequency of the ear canal. The speed of sound in air is 343 m/s. continued on page 6...
6 January 29, 2004; Page 6 B5. A point charge of C and a point charge of C are held a distance of 1.25 m apart. Calculate the absolute electrostatic potential at the point midway between the two charges. ANSWERS FOR PART B ENTER THE ANSWERS FOR THE PART B PROBLEMS IN THE BOXES BELOW. THE ANSWERS MUST BE EXPRESSED TO THREE SIGNIFICANT FIGURES AND THE UNITS MUST BE GIVEN. ONLY THE ANSWERS WILL BE MARKED. THE SOLUTIONS WILL NOT BE MARKED. B1 B2 B3 B4 B5 continued on page 7...
7 January 29, 2004; Page 7 PART C IN EACH OF THE FOLLOWING QUESTIONS, GIVE THE COMPLETE SOLUTION AND ENTER THE FINAL ANSWER IN THE BOX PROVIDED. THE ANSWERS MUST BE EXPRESSED TO THREE SIGNIFICANT FIGURES AND THE UNITS MUST BE GIVEN. SHOW YOUR WORK - NO CREDIT WILL BE GIVEN FOR ANSWERS ONLY. EQUATIONS NOT PROVIDED ON THE FORMULA SHEET MUST BE DERIVED. C1. Two strings that are fixed at each end are identical, except that one is m longer than the other. The strings have a mass per unit length of kg/m and a tension of 40.9 N, and the fundamental frequency of the shorter string is 212 Hz. Calculate the length of the longer string. continued on page 8...
8 January 29, 2004; Page 8 C2. In a very large, closed, pressurized storage tank for kerosene (density ρ = kg/m 3 ), the absolute pressure of the air above the kerosene is Pa. The kerosene leaves the tank through a nozzle directed straight upwards. The opening of the nozzle is 3.90 m below the surface of the kerosene. (a) Calculate the speed at which the kerosene leaves the nozzle, assuming atmospheric pressure is Pa. air kerosene (b) Calculate the height to which the kerosene rises above the nozzle (ignoring air resistance and viscous effects). continued on page 9...
9 January 29, 2004; Page 9 C3. Two point charges, Q 1 = 1.25 µc and Q 2 = µc, are held in place at (0, m) and ( m, 0), respectively, as shown in the diagram. (a) Calculate the electric field (magnitude and direction) at point P, located at (0.300 m, 0). Q 1 y m Q m m P x magnitude: direction: (relative to +x axis) END OF EXAMINATION
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