Wolkite University General Physics Final Exam ወልቂጤ ዩንቨርሲቲ ፋይናል ፈተና #Muja #ATC

Part 1: Say True if the statement is correct and False if the statement is incorrect (1 pt. each) 1. If two or more particles in an isolated system interact to each other, the total momentum of the system remains constant 2. The equation of continuity is derived from the law of conservation of mass of sompressible fluid 3. The center of mass of an object lies closer to the more masive particle 4. In isothermal processes the work done is equal to the amount of heat energy absorbed by a system 5x The pressure of a fluid decreases as increase in fluid depth 6- The change in internal energy of a cyclic process is zero Part III: Choose the correct answer among the given alternatives (1.5 pts each) 1 If a water bottle is knocked off a dosk, when does the bottle have the MOST kinetic energy? A. At the top of the fall At the bottom of the fall B. In the middle of the fall D. The bottle has the equal kinetic energy in all level f 5 2 Two particles colliding in perfectly inelastic collision which one of the following is NOT correct about two objects? A) They have common velocity after collision B) They stick together after collision They have the same kinetic energy before and after collision D) They have the same momentum before and after collision 3. Two-point masses 3 kg and 5 kg are at 4 m and 8 m from the origin on X-axis. respectively Locate the position of center of mass of the two-point masses (1) from the origin and (ii) from 3 kg mass, respectively A. (85 and 7.5) m C. (45 and 3.5) m (6.5 and 2.5) m D. (14.5 and 11.5) m 4. Bernoulli's equation is based on A Conservation of momentum Conservation of energy B Conservation of mass D. Mass-energy equivalence 5. If the net work done by external forces on a particle is zero, which of the following statements about the particle must be true? A Its velocity is zero C. Its velocity is unchanged ←(+) B. Its velocity is decreased D. Its speed is unchanged Flol(+ 6. A Hydraulic press has a ram of 30cm for lifting a weight of 35 kN diameter and a plunger of 2cm diameter. It is used Find the force required at the plunger A. 233.3 KN B 311.1 KN C. 466.6 kN 0.1555 kN 7. Lead has a greater density than in, and both are denser than water which one is the about the buoyant force on a lead and the buoyant force on an iron object of the same volume? A greater than the same less than 8. A balloon lifting in air follows the following principle D. pone A Law of gravitation C. principle of buoyancy B. Archimedes' principle D. all are correct 9 A horizontal pipe narrows from a diameter of 10 cm to 5 cm. For a non-viscous liquid lowing without turbulence from the larger diameter to the smaller, The velocity and pressure both increases B. The velocity increases and the pressure decreases C The velocity decreases and the pressure increases E D. The velocity and pressure both decrease 10. Heat is transmitted from a place of higher temperature to a place of lower temperature by means of particles with migration from one place to another A Conduction C Radiation Convection D. Direct buming 11. Consider the following pairs of materials. Which pair represents two materials, one of which is twice as hot as the other? Boiling water at 100°C, a glass of water at 50°C B. Boiling water at 100°C, frozen methane at -50°C C. An ice cube at -20°C, flames from a circus fire-eater at 233°C D. None of those pairs 12. Which one of the following is incorrect in isobaric process? The Volume of the system stay constant, and consequently work done is zero B. Expansion and compression occur at constant pressure C Any work done by the system results in a decreasing a volume D. The work done in the pressure-Volume graph is the area under the PV graph Part IV: Briefly state the following questions (5pts) 1. Briefly state the zeroth and First law of thermodynamics (2 pts) 287 2. State the following terms briefly 387 i) Work-energy theorem (1.5pts) ii) Archimedes principle (1.5pts) Part V: Solve the following problems by showing all the necessary steps (10 Pts each) A gas is taken through the cyclic process described in Figure 1 (2.5 pts each) a. Find the net energy transferred to the system by heat during one complete cycle b. If the cycle is reversed, the process follows the path ACBA, what is the net energy input per cycle by heat? 2. An object of mass 2kg is released from a top of inclined plane of 30° and height om. The coefficient of kinetic friction of the surface 3. What is the work done against friction force when the object reaches the bottom? B What is the kinetic energy of the object when it reaches the bottom? C. What is the speed of the object when it reaches the bottom? 00:00 Start 0:10 Part One 03:46 Part Two 05:07 Part Three 32:09 Part Four 35:00 Part Five