Example of Projectile Motion - Physics - Solved Exam Paper, Exams of Physics

Download Example of Projectile Motion - Physics - Solved Exam Paper and more Exams Physics in PDF only on Docsity! Physics 3204 August 2004Page 1 of 21 PART I Total Value: 50% Instructions: Shade the letter of the correct answer on the computer scorable answer sheet provided. 1. Which movement is an example of projectile motion? (A) climbing a wall (B) running around a track U (C) throwing a ball off a cliff (D) walking at a constant velocity 2. An egg is thrown in the air with a velocity of 15 m/s at 45 above the horizontal. What iso its horizontal velocity and vertical acceleration when it reaches the maximum height? horizontal velocity (m/s) vertical acceleration (m/s )2 (A) 0 0 (B) 0 -9.8 (C) 11 0 U (D) 11 -9.8 3. A projectile is launched at a 30.0 angle above the horizontal with a speed of 20.0 m/s. o What is the vertical displacement after 3.0 s? (A) - 74 m U (B) - 14 m (C) + 12 m (D) + 31 m 4. If a coin is pushed horizontally from a 1.2 m high table and lands 0.68 m from the base, what was the speed at which it left the table? U (A) 1.4 m/s (B) 1.9 m/s (C) 2.8 m/s (D) 5.7 m/s 5. What is the magnitude of the acceleration for the object shown below? U (A) 2.5 m/s2 (B) 3.0 m/s2 (C) 9.8 m/s2 (D) 12 m/s2 Physics 3204 August 2004 Page 2 of 21 6. A box is pulled on a smooth horizontal floor with a 1.00 × 10 N force, at 37.0 above the2 o horizontal. If the mass of the box is 40.0 kg, what is the normal force? (A) 292 N (B) 312 N U (C) 332 N (D) 393 N 7. Which represents the coefficient of kinetic friction for the diagram below? (A) (B) (C) U (D) 8. The diagram below shows a 1.0 kg cart connected to a 10.0 kg mass. Assuming the surface is frictionless, what is the acceleration of the system if the net force is 98.0 N? U (A) 8.9 m/s2 (B) 9.8 m/s2 (C) 11 m/s2 (D) 98 m/s2 9. In the diagram below, what causes acceleration down the incline? (Ignore friction) (A) M cos2 (B) Mg cos2 U (C) Mg sin2 (D) M sin2 Physics 3204 August 2004Page 5 of 21 20. A 4.00 × 10 N force is applied on one end of a 5.00 m lever. If an object on the other end3 of the lever is 1.00 m from the pivot point, what is the maximum weight that the object can be to balance the lever? (A) 8.00 × 10 N1 (B) 1.00 × 10 N2 U (C) 1.60 × 10 N4 (D) 2.00 × 10 N4 21. Which represents the gravitational field around a spherical mass? U (A) (B) (C) (D) 22. How many electrons are transferred when a 5.0 :C charged rod touches an electroscope? (A) 5.0 × 106 U (B) 3.1 × 1013 (C) 3.1 × 1019 (D) 8.0 × 1025 Physics 3204 August 2004 Page 6 of 21 23. In the diagram below sphere A and B exert a 4.0 N force on each other. If all three spheres have equal charges, what is the net force on sphere C? (A) 0 N (B) 2.0 N U (C) 5.0 N (D) 8.0 N 24. The magnitude of the electrostatic force between two charges is F. If the distance (d) between the charges is increased to d, what is the new force between the charges? (A) F (B) F U (C) F (D) F 25. If 4.8 × 10 J of work is required to move an electron between two points in an electric-17 field, what is the electric potential difference between these points? (A) 1.6 × 10 V-19 (B) 4.8 × 10 V-17 U (C) 3.0 × 10 V2 (D) 4.8 × 10 V2 26. Which scientist proposed that around any closed path the sum of the voltage rises is equal to the sum of the voltage drops? (A) Coulomb U (B) Kirchoff (C) Ohm (D) Volta 27. If four 20 S resistors are connected in parallel, what is the equivalent resistance? U (A) 5 S (B) 10 S (C) 20 S (D) 80 S 28. How much current will a 1.2 × 10 W hair dryer draw if it has a 10.0 S resistance?3 (A) 0.090 A (B) 1.0 A U (C) 11 A (D) 12 A Physics 3204 August 2004Page 7 of 21 29. Which circuit diagram below shows the proper connection of an ammeter and voltmeter to measure the current through and potential difference across a resistor? (A) (B) (C) U (D) 30. If the bar magnet below is broken, which represents the polarity of the region where the break occurs? (A) (B) U (C) (D) Physics 3204 August 2004 Page 10 of 21 38. Which shows the direction compass needles are deflected when placed near a current- carrying wire? (A) (B) U (C) (D) 39. Which graph represents the voltage output from a single coil D.C. generator? (A) U (B) (C) (D) Physics 3204 August 2004Page 11 of 21 40. Which diagram shows the direction of the induced current? (A) (B) U (C) (D) 41. How much energy is carried by a photon with a 661 nm wavelength? (A) 1.46 × 10 J-48 (B) 4.38 × 10 J-40 (C) 6.63 × 10 J-34 U (D) 3.01 × 10 J -19 42. When light of frequency 8.6 × 10 Hz is incident on a metal surface, the maximum kinetic14 energy of the photoelectrons is 0.500 eV. What is the work function of the metal? (A) 0.50 eV U (B) 3.1 eV (C) 3.5 eV (D) 4.1 eV Physics 3204 August 2004 Page 12 of 21 43. The diagram below shows the energy level diagram of a hydrogen atom. The arrows (W, X, Y, Z) indicate transitions of electrons in the atom. Which transition would cause the emission of a photon with the shortest wavelength? U (A) W (B) X (C) Y (D) Z 44. What did Compton discover after bombarding electrons with high energy photons? U (A) A photon’s momentum depends on its wavelength. (B) A photon with a short wavelength can be ejected. (C) Electrons and positrons come in pairs. (D) Electrons can be split into smaller particles. 45. How many protons, neutrons, and electrons are in a nucleus? protons neutrons electrons (A) 41 41 52 U (B) 41 52 41 (C) 93 52 93 (D) 93 93 52 46. What is another term for an " particle? U (A) helium nucleus (B) helium photon (C) neutron (D) positron 47. Which represents the decay of thorium 234? (A) (B) (C) U (D) Physics 3204 August 2004Page 15 of 21 Value 3% 51.(c) What is the maximum speed a car can travel around a curve on a flat road if the radius of the curve is 1.40 × 10 m and the tires and road have a coefficient of2 static friction of 0.35? 3% (d) A ball is thrown upward from a point 1.1 m above the ground at an initial velocity of 2.8 m/s and at a 78 angle to the horizontal. How high will the ball rise witho respect to the ground? 0 = (2.7m/s) + 2(-9.80m/s )(dy)2 2 V1y = sin78 x 2.8 m/s dy = 0.37 m0 = 2.7 m/s Height with respect to ground=0.37 m +1.1m =1.5 m 4% (e) In the diagram below, a 1.5 kg rat walks on a 2.0 kg uniform beam that is 2.2 m long. It wants to reach a 1.3 kg food basket hanging at the end. A cord that can withstand 45.5 N is used to support the beam at the end. What is the maximum distance the rat can walk on the beam before the cord breaks? Physics 3204 August 2004 Page 16 of 21 Value 51.(f) When a 6.0 kg frictionless cart is attached to the 2.0 kg box shown below, it slides forward. The coefficient of kinetic friction between the horizontal surface and the box is 0.10. 2% (i) What is the acceleration of the system? = (6kg)(9.80N/kg)(sin30 )-(0.10)(2kg)(9.80N/kg)0 (6 kg + 2.0 kg) = 3.4 m/s2 2% (ii) What is the magnitude of the tension in the rope? 52.(a) Two identically charged objects are placed 2.0 cm apart. The force of repulsion between them is 2.8 × 10 N.-2 2% (i) Determine the magnitude of the charge on each object. 2.8 x 10 N=(9.0x10 N.m /C )(Q1)(Q2)-2 9 2 2 (0.02m)2 1.1 x 10 N.m = 9.0x10 N.m /C xQ-5 2 9 2 2 2 Q = = 3.5 x 10 C-8 1% (ii) The charge on one object is doubled and the charge on the other is tripled. How will this change affect the magnitude of the electrical force between them? Physics 3204 August 2004Page 17 of 21 Value 3% 52.(b) In the diagram below, a metal ball on an insulated thread moves back and forth between two bells, creating sound. Explain how this occurs. The neutral metal ball is attracted to the negatively charged bell. The excess electrons on the negatively charged bell are then transferred by conduction onto the metal ball causing the ball to become net negatively charged. The negatively charged ball is then repelled from the bell and collides with the grounded bell to the right. The excess electrons on the negative ball are then transferred onto the grounded bell and then through the ground wire, leaving the ball neutral which will then be attracted to the neg. bell again 5% (c) Complete the table below for the given circuit. Show all workings in the space provided below the circuit diagram. Re sis tor 1 Resistor 2 Resistor 3 Resistor 4 Total Voltage (V) 16 8 8 8 24 Current (A) 4 3 0.5 0.5 4 Resistance (S) 4 2.7 16 16 6 Physics 3204 August 2004 Page 20 of 21 Value 2% 53.(a) If the work function of silver is 3.83 eV, what is the longest wavelength of sunlight that can eject an electron from a silver surface? Wo = 3.83 eV x 1.609 x 10 J/eV = 6.16 x 10 J-19 -19 2% (b) If element X has a half-life of 6 days, how many days will it take a 1.3 × 10 mg sample2 to decay to 15 mg? 3% (c) How much energy is released during the fusion of one atom of and one atom of ? Isotope Mass (kg) 3.3444 ×10-27 5.0082 × 10-27 6.6463 × 10-27 1.6749 × 10-27 Mass of reactants=3.3444x10 kg +5.0082x10 kg =8.3526 x 10 kg-27 -27 -27 Mass of products = 6.6463x10 kg +1.6749x10 kg =8.3212 x 10 kg-27 -27 -27 Mass difference= Mass of Reactants - Mass of Products = 8.3526x10 kg - 8.3212x10 kg= 3.14 x10 kg-27 -27 -29 E = mc2 = (3.14 x10 kg)(3.00 x10 m/s) = 2.83 x 10 J-29 8 2 -12 Physics 3204 August 2004Page 21 of 21 Value 3% 53.(d) A hydrogen atom in the first excited state (n =2) absorbs a photon and moves to the second excited state (n =3). What is the frequency of the absorbed photon? n=2E = -2.18 x 10 J = - 5.45 x 10 J -18 -19 (2)2 n=3E = -2.18 x 10 J = - 2.42 x 10 J -18 -19 (3)2 2 3E = E - E = - 5.45 x 10 J - - 2.42 x 10 J = -3.03 x 10 J -19 -19 -19 f = E = 3.03 x 10 J = 4.57 x 10 Hz-19 14 h 6.626 x 10 J.s-34