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

Download Projectile Motion - Physics - Past Exam Paper and more Exams Physics in PDF only on Docsity! Physics 3204 August 2006Page 1 of 18 PART I Total Value: 50% Instructions: Shade the letter of the correct answer on the computer scorable answer sheet provided. 1. Which illustrates projectile motion? (A) driving a car around a banked curve (B) dropping a rock from a building (C) juggling (D) running 2. A ball kicked from the ground at 12.0 m/s and 28° from the horizontal, returns to the ground in 5.0 s. What is the ball’s speed just before it hits the ground? (A) 0 m/s (B) 5.6 m/s (C) 11 m/s (D) 12 m/s 3. If a ball is thrown at an angle of 35o from the ground, at a speed of 8.0 m/s, what is the magnitude of the vertical component of the initial velocity? (A) 4.6 m/s (B) 5.6 m/s (C) 6.6 m/s (D) 8.0 m/s 4. A ball is thrown horizontally at 10.0 m/s. If it hits the ground 2.00 s later, what is the magnitude of the x-component of its velocity just before it hits the ground? (A) 0 m/s (B) 10.0 m/s (C) 20.0 m/s (D) 30.0 m/s 5. If a coin is pushed horizontally from a 1.2 m high table and lands 0.75 m from the base, what was the speed at which it left the table? (A) 0.38 m/s (B) 1.5 m/s (C) 1.9 m/s (D) 3.0 m/s 6. What is the magnitude of the acceleration for the object below if Ff = 1.0 N? (A) 0.80 m/s2 (B) 1.3 m/s2 (C) 1.5 m/s2 (D) 1.8 m/s2 Physics 3204 August 2006 Page 2 of 18 7. Which represents the range for a projectile launched horizontally with velocity, v, from height, h? (A) h v sin 4.9 θ (B) hvcos 4.9 θ− (C) hv 4.9 (D) hv 4.9 ⎛ ⎞ ⎜ ⎟ ⎝ ⎠ 8. For which free body diagram is ?netF 0≠ (A) (B) (C) (D) 9. What is the speed of a car as it travels around a circle with a radius of 3.4 × 102 m if its centripetal acceleration is 3.8 m/s2? (A) 11 m/s (B) 36 m/s (C) 130 m/s (D) 1300 m/s Physics 3204 August 2006Page 5 of 18 20. What is the tension in the cable below if a 490 N object is suspended from the end of a 5.0 m long uniform beam? Assume the beam is massless. (A) 490 N (B) 590 N (C) 760 N (D) 4800 N 21. What happens to a grounded object when it is charged by induction with a positively charged rod? (A) gains electrons from the rod (B) gains electrons from the ground (C) loses electrons from the rod (D) loses electrons from the ground 22. If two objects with the same mass and charge are brought near each other, which best describes their fields? Gravitational Electric (A) attractive attractive (B) attractive repulsive (C) repulsive attractive (D) repulsive repulsive 23. What are the charges on sphere A and B below? A B (A) negative negative (B) negative positive (C) positive negative (D) positive positive Physics 3204 August 2006 Page 6 of 18 24. If the charges on each of two identical spheres are doubled and the distance between the charges is halved, by what factor is the electrostatic force increased? (A) 2 (B) 4 (C) 8 (D) 16 25. What is the charge on an object that experiences a 5.0 N force in a 50.0 N/C electric field? (A) 0.10 C (B) 0.20 C (C) 2.0 C (D) 10.0 C 26. By which process does a solar calculator get its energy? (A) photo electricity (B) piezo-electricity (C) thermoelectricity (D) voltaic cell 27. Wire A has a resistance of 12 S. Wire B, of the same material, is twice as long and has half the cross-sectional radius of wire A. What is the resistance of wire B? (A) 1.5S (B) 12 S (C) 48 S (D) 96 S 28. What is the value of I in the circuit junction below? (A) 6 A (B) 10 A (C) 14 A (D) 30 A 29. Who proposed that around any closed path, the sum of the voltage rises is equal to the sum of the voltage drops? (A) Coulomb (B) Kirchoff (C) Ohm (D) Voltaire 30. How many electrons are transferred in a 10.0 A current that runs for 3.0 s? (A) 3.0 × 101 (B) 1.9 × 1020 (C) 6.2 × 1019 (D) 3.3 × 1031 Physics 3204 August 2006Page 7 of 18 31. If a copper wire was connected across points X and Y in the circuit below, what would be the current through the bulb and what would happen to the brightness of bulb? Current (A) Brightness (A) 0.64 dimmer (B) 0.64 brighter (C) 1.1 dimmer (D) 1.1 brighter 32. If four 20 S resistors are connected in parallel, what is the equivalent resistance? (A) 5 S (B) 10 S (C) 20 S (D) 80 S 33. If a 1.2 × 103 W hair dryer has a 10.0 S resistance, how much current will it draw? (A) 0.091 A (B) 11 A (C) 12 A (D) 120 A 34. If a 2.0 kW heater operates for 10.0 hours, what is the cost of operating the heater if the rate is $0.11/kWh? (A) $2.20 (B) $0.22 (C) $1.10 (D) $182 35. The graph below shows the output from a generator. What is true of the generator? (A) AC with multiple loops (B) AC with a single loop (C) DC with multiple loops (D) DC with a single loop Physics 3204 August 2006 Page 10 of 18 49. What is the wavelength of a charged particle, q, which is accelerated from rest through a potential difference, V ? (A) hc Vq (B) hcq V (C) hcV q (D) Vq hc 50. What is the function of the control rods in a fission reactor? (A) absorbs slow neutrons (B) increases the speed of neutrons (C) prevents heat loss from the core (D) transmits gamma rays Physics 3204 August 2006Page 11 of 18 PART II Total Value: 50% Instructions: Complete all items in this section. Your responses must be clearly presented in a well organized manner with proper use of units, formulae and significant figures where appropriate. Value 4% 51.(a) A ball rolls off an incline at 20.0 m/s, as shown in the diagram below. At what horizontal distance from the wall will the ball hit the ground? 3% (b) A 20.0 N force is applied to a 2.0 kg mass at 30.0° to the horizontal as shown in the diagram below. If friction is negligible, what is the tension in the string? Physics 3204 August 2006 Page 12 of 18 Value 4% 51.(c) A skier starts from rest and begins descending a 30.0° slope. The coefficient of kinetic friction is 0.10. (i) What is the acceleration of the skier? Include a free body diagram. (ii) How far down the slope will the skier travel in 10.0 s? 3% (d) What is the maximum speed a car can travel around a curve on a flat road if the radius of the curve is 1.20 × 102 m and the coefficient of static friction between the tires and road is 0.25? Physics 3204 August 2006Page 15 of 18 Value 3% 52.(c) The diagram below shows three charged objects. What is the net electrostatic force on B due to A and C? 2% (d) The diagram below shows a proton and an electron entering identical uniform magnetic fields. Describe two differences between the motions of the proton and electron after they enter the magnetic fields. Physics 3204 August 2006 Page 16 of 18 Value 3% 52.(e) An 9.80 × 10-16 kg oil drop is suspended between two horizontal parallel charged plates. If the electric field strength is 2.0 × 104 N/C, how many electrons are on the oil drop? 4% (f) A kitchen has two 120 W light bulbs, a 450 W coffee maker, and a 1280 W deep fryer operating on the same 120 V circuit at the same time. The circuit is protected by a 20.0 A fuse. What will happen if a 1200 W dishwasher is switched on within the same circuit? Use calculations to justify your answer. Physics 3204 August 2006Page 17 of 18 Value 3% 53.(a) The photocell in a movie projector contains sodium, which has a work function (Wo) of 2.28 eV. Explain, using calculations, why the photoelectric effect does not occur when the photocell is illuminated by a light with 8 = 650 nm. 3% (b) A radium isotope, , undergoes alpha decay to produce an isotope of radon.22688 Ra The chemical symbol for radon is Rn. (i) Write the decay equation showing the mass number and atomic number of all products. (ii) How much energy is released by the alpha decay given the masses below? Particle Mass (u) radium isotope 226.0244 radon isotope 222.0164 alpha 4.0026