Vertical Component of Velocity - Physics - Past Exam Paper, Exams of Physics

Download Vertical Component of Velocity - Physics - Past Exam Paper and more Exams Physics in PDF only on Docsity! Physics 3204 August 2009Page 1 of 19 PART I Total Value: 50% Instructions: Shade the letter of the correct answer on the computer scorable answer sheet provided. 1. Which represents the vertical component of the velocity at points X, Y and Z for the object following the parabolic path shown below? X Y Z (A) downward downward downward (B) downward zero upward (C) upward upward upward (D) upward zero downward 2. What is the range of a ball thrown horizontally at 12 m/s if its time of flight is 3.0 s? (A) 0.25 m (B) 4.0 m (C) 12 m (D) 36 m 3. An arrow is fired from a bow with an initial velocity of 18.0 m/s at an angle of 35.0E above the horizontal. How far, horizontally, has the arrow travelled in 1.45 s? (A) 12.4 m (B) 15.0 m (C) 21.4 m (D) 26.1 m 4. A ball is launched with an initial velocity of 28.0 m/s at 40.0E above the horizontal. How long does it take for the ball to reach its maximum height? (A) 1.68 s (B) 1.84 s (C) 2.19 s (D) 2.86 s 5. A golf ball is launched at an angle of 15.0E from the ground. What was the initial speed of the ball if it lands on the ground 3.42 s later? (A) 16.8 m/s (B) 17.3 m/s (C) 64.7 m/s (D) 129 m/s Physics 3204 August 2009 Page 2 of 19 6. A cannonball is fired on Earth at an angle of 45E above the ground and has a range of 125 m. If the same cannonball is fired on Jupiter where g = 24.6 m/s2, which combination of changes would have to occur so that the cannonball still has a range of 125 m? Launch Angle Launch Speed (A) decrease same (B) increase same (C) same decrease (D) same increase 7. What is the normal force acting on the 7.50 kg box shown? (A) 3.17 N (B) 6.80 N (C) 31.1 N (D) 66.6 N 8. A 16.0 kg box is held stationary on a frictionless incline as shown. What is the tension in the string? (A) 22.2 N (B) 89.9 N (C) 128 N (D) 157 N 9. What is the coefficient of kinetic friction for the incline shown if the 12 kg block is accelerating down the incline at 1.15 m/s2? (A) 0.30 (B) 0.42 (C) 0.70 (D) 0.87 Physics 3204 August 2009Page 5 of 19 17. Which is an expression of torque? (A) sinF rτ θ= ⋅ (B) maτ = (C) m vτ = ∆ (D) sinvτ θ= 18. What is the tension in each wire that supports the 10.0 kg sign shown? (A) 5.00 N (B) 10.0 N (C) 49.0 N (D) 98.0 N 19. Which additional force is necessary for the object shown to be in static equilibrium? 20.0 N (N) 20.0 N (E) (A) 20.0 N [NE] (B) 20.0 N [SW] (C) 28.3 N [NE] (D) 28.3 N [SW] 20. A 15.0 kg sign is hung from a 3.0 m long beam of negligible mass and supported by a cable as shown. What tension is required in the cable to support the sign? (A) 1.0 × 102 N (B) 1.5 × 102 N (C) 1.8 × 102 N (D) 2.1 × 102 N 21. Which describes electric field lines? (A) circle clockwise around positive charges (B) circle counterclockwise around positive charges (C) directed away from negative charges (D) directed toward negative charges Physics 3204 August 2009 Page 6 of 19 22. How many excess electrons reside on a metal sphere with a charge of !0.150 C? (A) 9.11 × 10!31 (B) 1.60 × 10!19 (C) 9.38 × 1017 (D) 6.24 × 1018 23. What is the force between a 1.50 × 10!5 C charge and a 1.03 × 10!5 C charge that are separated by a distance of 12.0 m? (A) 9.66 × 10!3 N (B) 1.16 × 10!1 N (C) 9.66 × 109 N (D) 1.16 × 1011 N 24. What force is experienced by a 2.50 × 10!6 C test charge placed in a 2.92 × 104 N/C electric field? (A) 8.56 × 10!11 N (B) 7.30 × 10!2 N (C) 6.57 × 108 N (D) 1.17 × 1010 N 25. How much work is done by a 9.00 V power supply in moving 8.50 × 1018 electrons? (A) 1.50 × 10!1 J (B) 1.22 × 101 J (C) 9.44 × 1017 J (D) 7.65 × 1019 J 26. What is the instrument used to measure electric current? (A) ammeter (B) galvanometer (C) ohmmeter (D) voltmeter 27. Which type of energy is converted to electrical energy using a piezo-electric device? (A) chemical (B) light (C) mechanical (D) thermal 28. A 6.0 Ω and a 12 Ω resistor are connected in series to a 36 V battery. What power is dissipated by the 6.0 Ω resistor? (A) 6.0 W (B) 12 W (C) 24 W (D) 48 W Physics 3204 August 2009Page 7 of 19 29. What is the resistance of a 1.0 m long copper wire of radius 0.0051 m (ρ = 1.69 × 10!8 Ω@m)? (A) 1.1 × 10!6 Ω (B) 3.3 × 10!6 Ω (C) 2.1 × 10!4 Ω (D) 1.2 × 10!3 Ω 30. What value of R in the circuit below will cause the parallel combination to dissipate the same power as the 4.0 Ω resistor? (A) 0.26 Ω (B) 2.9 Ω (C) 6.0 Ω (D) 6.7 Ω 31. Which is equivalent to 1 W? (A) V 1 A (B) 1 AΩ⋅ (C) 1V A⋅ (D) V 1 Ω 32. What is the polarity of X and Y for the magnets shown below? X Y (A) north north (B) north south (C) south north (D) south south Physics 3204 August 2009 Page 10 of 19 40. A conductor is initially at rest in a magnetic field as shown. In which direction should the conductor be moved so that current is induced as shown? (A) into the page (B) out of the page (C) towards bottom of the page (D) towards top of the page 41. How much energy is carried by a photon having frequency 1.5 × 1011 Hz? (A) 1.4 × 10!25 J (B) 9.9 × 10!23 J (C) 3.0 × 10!14 J (D) 1.3 × 10!3 J 42. A metal has a work function of 4.50 eV. What is the maximum kinetic energy of the ejected electrons if the wavelength of the incident light is 2.50 × 10!7 m? (A) 0.37 eV (B) 0.46 eV (C) 4.97 eV (D) 9.47 eV 43. A photon with energy Eo strikes a free electron. The photon is deflected in the opposite direction, with energy E. What is the resulting kinetic energy of the electron? (A) Eo (B) E (C) Eo ! E (D) Eo + E 44. What is the frequency of a photon of light that has a momentum of 2.80 × 10!27 N@s? (A) 2.37 × 10!7 Hz (B) 4.21 × 10!6 Hz (C) 4.23 × 106 Hz (D) 1.27 × 1015 Hz 45. What is the mass of an object thrown with a speed of 45 m/s and having a de Broglie wavelength of 3.32 × 10!34 m? (A) 0.011 kg (B) 0.044 kg (C) 22 kg (D) 88 kg 46. Which best explains why each atom in the periodic table has a unique set of spectral lines? (A) Each atom has a unique neutron to proton ratio. (B) Each atom has a unique set of energy levels. (C) The electrons in atoms are in constant motion. (D) The electrons in atoms orbit the nucleus. Physics 3204 August 2009Page 11 of 19 mass (g) time (h)1 2 3 4 5 6 7 8 9 10 11 12 2 4 6 8 10 12 14 16 47. Which transmutation is represented by the equation ? 238 234 4 92 90 2 U Th He→ + (A) alpha decay (B) beta minus decay (C) beta positive decay (D) gamma decay 48. Which shows the beta minus (β-) decay of ?90 38 Sr (A) 90 1 89 38 0 38 Sr Sre − → + (B) 90 0 90 38 1 39 Sr Ye − → + (C) 90 1 91 38 0 38 Sr Sre − → + (D) 90 0 90 38 1 37 Sr Rbe − → + 49. A radioactive material has an initial activity of 1320 Bq. What is its activity after 9.0 h if its half-life is 3.2 h? (A) 1.9 × 102 Bq (B) 2.4 × 102 Bq (C) 1.0 × 103 Bq (D) 1.2 × 103 Bq 50. What is the half-life of the unknown substance shown? (A) 2 h (B) 3 h (C) 8 h (D) 10 h Physics 3204 August 2009 Page 12 of 19 225 N 30.0° 0.510kµ = PART II Total Value: 50% Instructions: Complete all items in this section. Your responses should 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 is thrown with an initial velocity of 82.0 m/s at an angle of 53.0E below the horizontal as shown. Calculate the range of the ball if it is thrown from a height of 10.0 m. 4% (b) A 23.5 kg lawn mower is pushed with a force of 225 N as shown (µk = 0.510). i) Draw a free body diagram for the lawn mower. ii) Calculate the magnitude of the acceleration of the lawn mower. Physics 3204 August 2009Page 15 of 19 Value 4% 52.(a) Calculate the net electric field at point P in the diagram shown. 3% (b) An electron is placed between two oppositely charged parallel plates with an electric field strength of 2.7 × 104 N/C and accelerates horizontally toward one of the plates. i) Calculate the acceleration of the electron. ii) Calculate the speed of the electron after it has travelled 0.22 m. Physics 3204 August 2009 Page 16 of 19 Value 5% 52.(c) In the circuit shown, calculate: i) the voltage for R4. ii) the value of R1. iii) the power dissipated in R3. Physics 3204 August 2009Page 17 of 19 Value 2% 52.(d) A 75 Ω resistor that is 0.28 m long is placed in a uniform magnetic field of 0.25 T. If the resistor experiences a force of 4.0 × 10!2 N when it is perpendicular to the magnetic field, calculate the voltage across the resistor. 3% (e) Calculate I1 so that the net magnetic field at point P is zero.