49. A gas expands and does 215 J of work on a piston. The gas exerts a pressure of 1230 Pa on the piston. What is the change in volume of the gas? A. 0. 175 m3 B. 5.72 m3 C. 12.1 m3 D. 264000 m3 ians islinelog 50. The temperature of an ideal gas increases from 20 .C to 40 .C while the pressure stays the same. What happens to the volume of the gas? A. it doubles B. It quadruples C. It slightly increases D. It slightly decreases38. How does a plane fly, theoretically? A. Airplanes have jet blast blasters beneath the wing . strong. B. Gravity creates an equal and opposite reaction because it isn't that C. High pressure presses up against the low pressure on the bottom of the wing. D. High pressure presses down against the high pressure on the bottom of the wing. 39. Considering Bernoulli's Principle, what do you think will happen if you get a shower curtain next to running water? A. Curtains stays the same B. Water gets the curtain wet C. Curtain goes in toward the shower D. Curtain goes outward from the shower 40. Why is the top of an airplane wing curved? A. To make the wing look cool B. To create an area of low pressure above the wing C. To create an area of high pressure above the wing D. To create equal pressure above and below the wing 41. Which of the following statements is NOT true about the laws of thermodynamics? A. Heat flows from an object with low temperature to an object with higher temperature. B. Thermal equilibrium of two objects with different temperatures will attain at some point. C. An object with a lower temperature will lose its energies when in direct contact with an object with a higher temperature. D. An object with a higher temperature will gain energy from an object with a lower temperature when they are in direct contact 42. Why is the electric wire that is connected in the post outside a little bit saggy and not tightly tied? A. So that it will not be tangled by the other wires B. To make space for other wires to easily connect C. So that it will not break once the wire will expand D. So that it will not hard for the line men to reach it43. What is thermal expansion? A. Is a decrease in the volume of a material when temperature decreases B. Is an increase in the volume of a material when temperature increases particles C. The transfer of thermal energy between materials by the collisions of D. The transfer of electric potential energy between materials by the collisions of particles 44. A material of length Li at temperature 0, K is subjected to a temperature rise of & K. The coefficient of linear expansion of the material a KA. What is the expansion of the material? A. Lia B. Lia(0 - 01) C. L2(1 + a8) D. Liji + a(8 - 61)] 45. Calculate the change in length of a 100-mm aluminum bar that has increased in temperature by 55 .C. (Take the coefficient of expansion to be 25 x 10-6) A. 0. 1375mm B. 0.258mm C. 1.23mm D. 1.37mm 46. Which of the following laws accounts for temperature, volume, pressure, and moles of gas within an individual system? A. Boyle's Law B. Charles' Law C. Ideal Gas Law D. Gay-Lussac's Law 47. What is the density of carbon dioxide in km/m3 at 27 .C at 100 kPa? A. 1.76 B. 2.76 C. 3.76 D. 4.76 48. What is the area enclosed by the PV graph of a complete heat engine cycle? A. the heat intake per cycle B. Equals the heat output per cycle C. Equals the work done on the engine per cycle D. Equals the work done by the engine per cycle33. What causes sound when you pluck the string of a guitar? A. Tuning machines B. Vibrations of the string C. Sound hole in the middle of the guitar D. Frets or metal strips along the length of the neck 34. A guitar string has a length of 0.50 m and produces a wave speed of 565 m/s along it. What is the frequency of the 3rd harmonic? A. 93.2 Hz B. 282.5 Hz C. 1130 Hz D. 1712 Hz 35. A wave generated at the left end of the medium undergoes reflection at the fixed end on the right side of the medium, as shown in Figure 3. Figure 3. Standing Wave Pattern (Source: https://www.physicsclassroom.com/reviews/ sound/ Sound-Waves-and-Music-Review-Answers-2) How many antinodes are shown in this standing wave pattern? e bris avoda A. 3.0 B. 5.0 C. c.of mods aunt TON sinomainte priwollot and to doidw it D. 7.0 Whew mos do rin moil upon test .A 36. What is the formula for density? A. density = mass x volume alosido own lo muruliliope lennonT B B. density = mass / volume trog amoe TB rushis C. density = mass + volume worimaquist itwol a few tosido nAD D. density = mass - volume ol ladyid s riw moldo te rhiw Josingo 37. What is the volume of 150 g of lead if it has a density of 11.3 g/cm3? A. 0.075 g B. 13.3 guo dog orit rit C. 13.3 cm3 D. 1695 cm3