PHYS 210 Final Collection Finals with Solution, Spring 2017

Started on | Thursday, 4 June 2009, 03:04 PM Completed on | Thursday, 4 June 2009, 05:03 PM Time taken | 1 hour 59 mins Grade | 75 out of a maximum of 103 (73%) Page: 123 4 5 6 (Next) Show all questions on one page A pressurized cylindrical tank, 5.0 m in diameter, contains water that emerges from the pipe at point C, with a Mates velocity of 50 m/s. Point A is 10 m above point B and point C is 3 m above point B. The area of the pipe at point B is 0.07 m?, and the pipe narrows to an area of 0.04 m? at point C. Assume the water is an ideal fluid in laminar flow. The mass flow rate in the pipe is closest to: Choose one answer. » 1800 Kg/s x 2000 Kg/s y @ c. 1600 Kg/s_ x d. 1200 Kg/s x 1400 Kg/s x a © Incorrect Marks for this submission: 0/4. Marks: 3 A Carnot engine has an efficiency of 24.0%. It operates between constant-temperature reservoirs differing in temperature by 57.4 °C. In kelvins, what is the temperature of the hot reservoir. Give your answer in Kelvin; do not put the unit next to your answer. Answer: 1376.6 Incorrect Correct answer: 239.17 Marks for this submission: 0/3. Marks: 2 Air enters a hot-air furnace at 7°C and leaves at 77°C. If the pressure does not change each entering cubic meter of air expands to: Choose one answer. ~ 0.8 m? x @ ~1.25m9 vy ~ 1.9m? x ~7.0m? x ~1im? x Correct Marks for this submission: 2/2. Started on | Saturday, 23 May 2009, 10:05 AM Completed on | Saturday, 23 May 2009, 11:25 AM Time taken | 1 hour 20 mins Grade | 71 out of a maximum of 105 (68%) Page: 1 2 3 4 5 (Next) Show all questions on one page Makes A transverse wave is propagated in a string stretched along the x-axis. The equation of the wave, is given by y=0.005 cosp(38t — 14x) The time is in seconds and x is in meter.The wave speed, including the sense of direction along the x-axis is closest to: Choose one answer. a.-0.37 ms x b. 48.48 ms x ® c.-27ms x d.+0.37 ms x e427 m/s ¥ Incorrect Marks for this submission: 0/5, 13 Marks: 4 Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 toa final volume of 100 cm3. Choose one answer. Correct Marks for this submission: 4/4. a.52 x b.67 y c.208 x d.71 x e191 x 20 Marks: 3 The following four waves are sent along strings with the same linear densities (x is in meters and t is in seconds). yi = 3sin(x-3t) y2 = 6sin(2x-t) y3 = sin(4x-t) y4 = 2sin(x-2t) Rank the waves according to their wave speed, greatest first. Choose one answer. ® y1 has the highest wave speed, then y4, then y2 followed by the slowest wave speed for y3. ¥ y3 has the highest wave speed, then y2, then y4 followed by the slowest wave speed for y1. x y3 has the highest wave speed, then y4, then y2 followed by the slowest wave speed for y1. x y1 has the highest wave speed, then y2, then y4 followed by the slowest wave speed for y3_ x Cannot tell need more information. x Correct Marks for this submission: 3/3. 16 The root-mean-square speed of a certain gas at 100 °C is 500 m/s. If the temperature of the gas is increased to Marks: 4 + . 200 °C, this speed will be closest to: Choose one answer. a. 1000 m/s x b. 804 m/s x c. 365 m/s x d. 563 mis ¥ e. 705 m/s x Incorrect Marks for this submission: 0/4 v7 One mole of an ideal gas is heated from a state where the pressure is P: =(0.5 atm to a state where the pressure Marks: § is P. =1.5 atm, in such a way that the pressure is directly proportional to the volume (P=kV, k>0 is a constant). If the initial temperature of the gas is Tj =300 K, what is the final temperature of the gas ? Choose one answer. a. 2700K ¥ b. 3600K x © c. 900K x d. 225K x e. 450K x Incorrect Marks for this submission: 0/5 sad A light ray passes through a glass medium of refraction index n=1.50 and thickness T=3.0 cm (see Figure). The Marks: 4 time needed for the light to travel the glass is (ns=nanosecond=10-9 s), (speed of light 3x1 08 mis 3 Choose one answer. a.0.159ns y b.045ns x c.0.106ns x d.0.150ns x e.030ns x Correct Marks for this submission: 4/4. 21 Marks: 2 Radio waves differ from visible light waves in that radio waves: Choose one answer. travel slower x have a higher frequency x travel faster x © have a lower frequency ¥ require a material medium x Correct Marks for this submission: 2/2. 22 If a material is very incompressible, which of the following is true about its bulk modulus? Marks: 2 Choose one answer. The bulk modulus is small. x @ The bulk modulus is large. ¥ the bulk modulus is unrelated to the compressibility of the medium. x Correct Marks for this submission: 2/2. 18 Consider 0.5 mol of an ideal gas undergoing a cyclic process as shown in the Figure . The process labeled (b) is HELENS isothermal with a temperature 500 K. What is the work done by the gas through the cycle ?. Note that the work is positive in this case. Give your answer in kilojoules without units and 2 figures after the point, like 20.21) (4L=1073 m3, 1kJ=1000 J, 1kPa= 1000 pa) p, kPa 409 | —s wel XG 300- N Answer: 1.14 Correct Marks for this submission: 6/6. 18 A 360-nm thick oil film floats on the surface of the water. The index of oil is no =1.50 and that of water is nwater Mate: =1.33. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the range 400 nm to 800 nm that are most strongly reflected are close to (answer in nm=nanometer=10° m): (1) 412 and 700 (2) 432 and 720 (3) 450 and 740 (4) 470 and 760 (5) 490 and 780 Choose one answer. a. (3) x b. (5) x ® «(4x (2) Vv e.(1) x Incorrect Marks for this submission: 0/4