PHYS 210 Final, Fall 2011

pp PHYS AR Sen 2011-12. Googie Crome © moodle.aub.edu.lb/mod/quiz/review.php?q=5816&attempt=158512 Close this window rn Started on Friday, 27 January 2012, 05:42 PM Completed on Friday, 27 January 2012, 07:32 PM Time taken 1 hour 50 mins a Marks 63/107 Grade 59 out of a maximum of 100 (59%) Page: 123 4567 8 9 (Next) Show all questions on one page Marks: 3 Two slits separated by 0.10 mm are illuminated with green light () = 540 nm). Calculate the distance (in cm) from the central bright-region to the 12th bright band if the screen is 1.0 m away. Give your answer in centimeters. Do not put the unit. Answer: 648 Correct Marks for this submission: 3/3. vrarks: 3 The sound intensity 6.4 m from point source is 0.50 W/m2. The power (in Watt) output of the source is: Answer: 257.3692702 Correct Marks for this submission: 3/3. 3 Marks: 3 The sound level at a point P is 14 db below the sound level at a point 1.0 m from a point source. The distance from the source to point P is: Choose one answer. ~4com x oD PHYS210 0 etme raf 2011-12 Googie Gomme © moodle.aub.edu.lb/mod/quiz/review.php?q=5816&attempt=158512 ~ 202m x io ® ~Smy ~ 25m x ~2m x Correct Marks for this submission: 3/3. 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. @ yi 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. Page: 123 4567 8 9 (Next) c PHYS210_si00_tchristi: Final Exam Fall 2011-12 - Google Chrome © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512page=4 GFATE SF OU OS MAXIMUM OF IU TSI VT Page: (Previous) 1 2 3 4 5 6 7 8 9 (Next) Show all questions on one page 17 = Marks: 4 In the below figure, a string, tied to a sinusoidal oscillator at P and running over a support at Q, is stretched by a block of mass m. Separation L = 1.1 m, linear density py = 1.6 g/m, and the oscillator frequency f = 190 Hz. The amplitude of the motion at P is small enough for that point to be considered a node. A node also exists at Q. Oscillator Pp. @ What mass m allows (in Kg) the oscillator to set up the 4 harmonic (i.e. n = 4) on the string? UW Take g = 9.8 m/s; Give your answer in Kg; do not put the unit next to your answer. Answer: 1.74724 Incorrect Correct answer: 1.78 Marks for this submission: 0/4. 18 The below Figure shows four situations in which a red liquid and a gray liquid are in a U-tube. In one situation the Marks: 3 liquids cannot be in static equilibrium; Which situation is that: © PHYS210 00 tchist Final Exam Fall 2011-12 - Google Chrome" cc >) © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512page=4 Correct answer: 1.75 A Marks for this submission: 0/4. 18 The below Figure shows four situations in which a red liquid and a gray liquid are in a U-tube. In one situation the Marks: 3 liquids cannot be in static equilibrium; Which situation is that: @ ey w Choose one answer. ® situation (2) vy (a situation(3) x situation(1) x situation(4) x Correct a Marks for this submission: 3/3. fe 19 - Marks: 3 A net 50 N force acts on a 2-kg mass that starts from rest. At the instant the mass has moved 2.0 m, the rate at which work is being done on the mass is Choose one answer. 25W x | 25W x 75W x 100W x © 500W ¥ © PHYS210 00 tchist Final Exam Fall 2011-12 - Google Chrome" cc >) © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512page=4 situation(1) x situation(4) x Correct Marks for this submission: 3/3. 19 Marks: 3 A net 50 N force acts on a 2-kg mass that starts from rest. At the instant the mass has moved 2.0 m, the rate at which work is being done on the mass is Choose one answer. 25W x 25W x 75W x 100W x ® sowy Correct Marks for this submission: 3/3. 20 Marks: 3 Weak background noises from a room set up the 4% harmonic standing wave in a cardboard tube of length 0.67 m with two open ends. Assume that the speed of sound in the air within the tube is 343 m/s. What frequency (in Hz) do you hear from the tube? 7 Answer: 1023.88 Correct Marks for this submission: 3/3. Page: (Previous) 1 2 3 4 5 6 7 8 9 (Next) I © PHYS210 00 tchist Final Exam Fall 2011-12 - Google Chrome _ =) © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512&page=5 GFATE SF OU OS MAXIMUM OF TUT (SIFT Page: (Previous) 1 2 3 4 5 6 7 8 9 (Next) Show all questions on one page 21 | Marks: 3 In a hot summer day the average temperature in Beirut is 35 °C, on that same day the temperature in Barouk mountain is 5 °C, the rms speed of the gas molecules in Barouk is decreased by: Choose one answer. 5.2% ¥ @® 14.2% x 46% x = 21% x 31% x Incorrect Marks for this submission: 0/3. 22 . . . . | 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. ~ 0.8m? x ® ~125m v ~1.9m3 x ~7.0m3 x ~ iim? x Correct Marks for this submission: 2/2. © PHYS210_si00_tchristi: Final Exam Fall 2011-12 - Google Chrome © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512&page=5 Correct is Marks for this submission: 2/2. 23 . A +, ., . +, . *, Marks: 3 A hollow cylinder of radius r =0.47 m is spun about a horizontal axis. A stone located inside the cylinder gets stuck to the wall. When the stone is at the highest point, it exerts a force equal to its weight on the wall of the cylinder, tangential speed (in m/s) of the stone is: Lis g = 9.8 m/s?; Give your answer in m/s; do not put the unit next to your answer. Answer: 2.14615936 Incorrect Correct answer: 3.04 Marks for this submission: 0/3. 24 Marks: 3 ii A block has a volume of 8 cm?. When weighed on a spring scale calibrated in grams, the scale reads 20 g. What does the scale indicate (in grams) if the block is weighed while immersed in a liquid of density 1.4 g/em3. Give your answer in grams; do not put the unit next to your answer. Answer: 19.89024 Incorrect & PHYS210_si00_tchristi: Final Exam Fall 2011-12 - Google Chrome © moodle.aub.edu.lb/mod/quiz/review.php?attempt=158512&page=5 to the wall. When the stone is at the highest point, it exerts a force equal to its weight on the wall of the cylinder, “ tangential speed (in m/s) of the stone is: sof g=9.8 m/s?; Give your answer in m/s; do not put the unit next to your answer. Answer: 2.14615936 Incorrect Correct answer: 3.04 Marks for this submission: 0/3. 24 Marks: 3 A block has a volume of 8 cm?. When weighed on a spring scale calibrated in grams, the scale reads 20 g. What does the scale indicate (in grams) if the block is weighed while immersed in a liquid of density 1.4 g/cm?>. Give your answer in grams; do not put the unit next to your answer. Answer: 19.89024 m, Incorrect Correct answer: 8.80 Marks for this submission: 0/3. Page: (Previous) 1 2 3 4 5 6 7 8 9 (Next) © PHYS210.si00.tchrist Final Exam Fall 2011-12 Google Chrome _ ccc == lef © moodle.aub.edu.b/mod/quiz/review.php?attempt=158512page=6 GFATE SF OU OS MSXIMUMT OF TUT (SIFT Page: (Previous) 1 2 3 4 5 6 7 8 9 (Next) Show all questions on one page 25 = Marks: 3 A automobile moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 485 Hz relative to the police car, what is the frequency (in Hz) heard by an observer in the automobile after the police car passes the automobile? The speed of sound in air is 343 m/s. Do not put the uni FE Answer: 381.3456464 Correct Marks for this submission: 3/3. 26 [| Marks: 3 A mass starts from rest and moves along the x-axis under the influence of a net force that is proportional to t, its kinetic energy is proportional to Choose one answer. tx ® ty ty ut x x Incorrect Marks for this submission: 0/3. © PHYS210_si00.tchist Final Exam Fall 2011-12 - Google Chrome ce =) © moodle.aub.edu.b/mod/quiz/review.php?attempt=158512page=6 Incorrect oI Marks for this submission: 0/3. 27 Marks: 3 A traveling sinusoidal wave is shown below. At which point is the motion 180°out of phase with the motion at point P? Displacement _7 Choose one answer. point B x ® pointc y pointD x mw pointE x None of the points shown is 180 degrees out phase with P x Correct Marks for this submission: 3/3. 28 tae . Pr . _ . 1 Marks: 3 A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarized light is: Choose one answer. 1:4 x 1:3 x 1:2 x Lg 3:4 x 38 y ©