Acceleration of Projectile - Physics - Past Exam Paper, Exams of Physics

Download Acceleration of Projectile - Physics - Past Exam Paper and more Exams Physics in PDF only on Docsity! Physics 3204 June 2007Page 1 of 20 PART I Total Value: 50% Instructions: Shade the letter of the correct answer on the computer scorable answer sheet provided. 1. What is the acceleration of the projectile at each point in the diagram below? Acceleration (m/s2) X Y Z (A) -9.8 -9.8 -9.8 (B) -9.8 0 9.8 (C) 9.8 9.8 -9.8 (D) 9.8 0 -9.8 2. If a projectile is launched from ground level with an initial velocity of 65 m/s at 30.0E above the horizontal, what is its total time in the air? (A) 3.3 s (B) 6.6 s (C) 12 s (D) 13 s 3. An object is projected horizontally from a 0.95 m high table at a velocity of 12 m/s. How far from the base of the table will the object hit the floor? (A) 2.3 m (B) 5.3 m (C) 11 m (D) 27 m 4. Two arrows are launched at the same time with the same initial velocity. Arrow X is fired at an angle of 60E to the horizontal, and arrow Y is fired at an angle of 45E to the horizontal. Which best describes the motion of arrow X compared to the motion of arrow Y? (A) Arrow X has a longer flight time and longer horizontal range. (B) Arrow X has a longer flight time and shorter horizontal range. (C) Arrow X has a shorter flight time and longer horizontal range. (D) Arrow X has a shorter flight time and shorter horizontal range. 5. A 1.5 kg block slides down an incline at a constant speed as shown. What is the net force acting on this block? (A) 0 N (B) 6.2 N (C) 13 N (D) 15 N Physics 3204 June 2007Page 2 of 20 6. If a 5.00 kg box slides down a ramp inclined at 60.0E above the horizontal, what is the normal force exerted on the box? (A) 2.50 N (B) 24.5 N (C) 42.4 N (D) 49.0 N 7. If a force of 45 N is applied at a 35E angle above the horizontal to pull a 21 kg crate forward, what is the normal force on the crate? (A) 170 N (B) 180 N (C) 210 N (D) 230 N 8. If the system below is at rest, what is the coefficient of static friction? (A) 0 (B) 0.30 (C) 0.43 (D) 0.70 9. The diagram below shows two blocks connected by a massless string over a frictionless pulley. If the blocks accelerate at 3.0 m/s2 in the direction shown, what is the tension in the connecting string? (A) 6 N (B) 12 N (C) 18 N (D) 49 N Physics 3204 June 2007Page 5 of 20 15. The diagram below shows a pail of water being swung in a vertical circle of radius 1.3 m. What is the minimum speed, v, at the top of the circle that will keep the water from spilling? (A) 3.6 m/s (B) 7.5 m/s (C) 9.8 m/s (D) 13 m/s 16. At which point on a uniform object can the force of gravity be considered to act? (A) centre of mass (B) centre of rotation (C) moment of force (D) moment of torque 17. A perpendicular force of 14 N is applied at 2.0 m from the pivot point of a seesaw. What is the magnitude of the torque about the pivot? (A) 0.14 NAm (B) 7.0 NAm (C) 12 NAm (D) 28 NAm 18. Which condition will produce rotational equilibrium? (A) netF 0= (B) xF 0= (C) net 0τ = (D) x 0τ = 19. The diagram below shows a force applied on a beam in different directions. In which direction will the force produce the smallest torque about the hinge? (A) A (B) B (C) C (D) D Physics 3204 June 2007 Page 6 of 20 20. If a traffic light is suspended by two wires as shown below, what is the tension in each wire? (A) 180 N (B) 340 N (C) 820 N (D) 1 600 N 21. Which shows the electric field between two equal but opposite charges? (A) (B) (C) (D) Physics 3204 June 2007Page 7 of 20 22. Which describes a neutral electroscope after it is briefly touched with a positively charged rod? (A) top of electroscope negative, bottom of electroscope negative (B) top of electroscope negative, bottom of electroscope positive (C) top of electroscope positive, bottom of electroscope positive (D) top of electroscope positive, bottom of electroscope negative 23. The diagram below shows a positively charged rod placed near, but not touching, a neutral metal ball. Which best describes what happens to the sides of the ball? (A) X becomes negative and the ball is repelled from the rod. (B) X becomes positive and the ball is attracted to the rod. (C) Y becomes negative and the ball is repelled from the rod. (D) Y becomes positive and the ball is attracted to the rod. 24. What is the magnitude of the electric field strength at a distance of 0.010 m from an object having a charge of 0.25 C? (A) 5.6 x 1010 N/C (B) 2.3 x 1011 N/C (C) 5.6 x 1012 N/C (D) 2.3 x 1013 N/C 25. An electric field has a strength of 130 N/C and exerts a 65 N force on a cluster of electrons. If the cluster of electrons is put through a potential difference of 450 V, how much work is done by the field? (A) 1.1 × 10!3 J (B) 2.3 × 102 J (C) 9.0 × 102 J (D) 3.8 × 106 J 26. Which is true for the strength of the electric field shown? (A) decreases downward (B) decreases to the right (C) increases downward (D) increases to the right Physics 3204 June 2007 Page 10 of 20 37. Which shows the magnetic field on both sides of a current-carrying wire? (A) (B) (C) (D) 38. A bar magnet is moved away from a coil as shown. What is the direction of the induced current through the resistor and the polarity of the left end of the coil? Direction of induced current Polarity of left end of coil (A) X to Y north (B) X to Y south (C) Y to X north (D) Y to X south Physics 3204 June 2007Page 11 of 20 39. A wire of length 0.20 m is placed in a 0.25 T magnetic field at an angle of 35E to the field. What is the current in the wire if it experiences a force of 0.75 N? (A) 0.038 A (B) 0.056 A (C) 18 A (D) 26 A 40. An electron in a uniform magnetic field, is moving downward as shown below. What is the direction of the force on the electron? B (A) towards the bottom of the page (B) towards the left side of the page (C) towards the right side of the page (D) towards the top of the page 41. Which best describes Einstein’s explanation of the photoelectric effect? (A) Light energy is concentrated in distinct “packets”. (B) Light energy is evenly distributed over the entire wave front. (C) Metallic surfaces always absorb electrons when illuminated. (D) Metallic surfaces always emit electrons when illuminated. 42. Which characterizes a photon of light? (A) both energy and momentum (B) energy, but not momentum (C) momentum, but not energy (D) neither energy nor momentum 43. What is the de Broglie wavelength of a neutron travelling at 5.00 m/s? (A) 1.58 × 10!8 m (B) 7.91 × 10!8 m (C) 3.96 × 10!7 m (D) 7.92 × 10!7 m 44. A metal with a work function of 4.56 eV is illuminated by light with a wavelength of 1.7 x 10!7 m. What is the maximum kinetic energy of the emitted photoelectrons? (A) 4.4 × 10!19 J (B) 7.3 × 10!19 J (C) 1.9 × 10!18 J (D) 1.5 × 10!18 J 45. If the orbital radius of an electron in a hydrogen atom is 2.12 x 10!10 m, at what energy level is the electron? (A) 1st (B) 2nd (C) 4th (D) 8th Physics 3204 June 2007 Page 12 of 20 46. How many electrons are in the atom ?73Li (A) 3 (B) 4 (C) 7 (D) 10 47. If a β+ particle is emitted from an unstable nucleus, what happens to the atomic number of the nucleus? (A) decreases by 1 (B) decreases by 2 (C) increases by 1 (D) increases by 2 48. Complete the nuclear reaction: 16 1 48 0 2O n ? + He+ → (A) 126C (B) 136 C (C) 128C (D) 138C 49. The diagram below illustrates part of a typical chain reaction for Uranium-235. Which nuclear equation describes the chain reaction? (A) 1 235 144 89 10 92 56 36 0n + U Ba + Kr + 3 n→ (B) 1 235 144 89 10 92 56 36 0p + U Ba + Kr + 3 n→ (C) 235 144 89 192 56 36 0U Ba + Kr + 4 n→ (D) 1 235 144 890 92 56 364 n + U Ba + Kr→ 50. How much of a 60.0 g radioactive isotope remains after four half-lives? (A) 3.75 g (B) 7.50 g (C) 9.60 g (D) 15.0 g 235 92U Physics 3204 June 2007Page 15 of 20 Value 3% 51.(e) A 56.0 kg person suspended by cables hangs motionless as shown. Calculate the magnitude of the tension T1, T2 and T3 in each cable. 4% (f) A 20.0 kg sign is supported at the end of a 2.50 m horizontal beam of mass 21.0 kg that is hinged to a pole as shown. i) Calculate the magnitude of the tension in the cable. ii) Calculate the magnitude of the horizontal component of the force exerted on the beam by the hinge. Physics 3204 June 2007 Page 16 of 20 Value 3% 52.(a) Three charged spheres are arranged as shown. Calculate the magnitude of the net force on Y due to the presence of X and Z. 3% (b) A negatively charged particle with a mass of 5.90 × 10!15 kg is at rest between two horizontal parallel charged plates as shown. If there is an excess of 5.0 x 102 electrons on the particle, calculate the electric field strength between the parallel plates. Physics 3204 June 2007Page 17 of 20 Value 5% 52.(c) Given the circuit in the diagram below, calculate: (i) the current through the 5.00 Ω resistor. (ii) the resistance of R. (iii) the potential difference across the battery. 3% (d) A soldering iron of resistance 576 Ω is connected to a 120 V circuit. Calculate the cost to operate the soldering iron 8.0 hours a day for 21 days, if energy costs $0.080/kWAh.