PHYS 210 Final, Fall 2007

You are logged in as rabih Mahmasani (Logout) E-Learning Time Remaining 1:59:2: \~ (info Results | Preview Y Edit ) This quiz has been locked so that it is only accessible from certain locations. Your computer is not on an allowed subnet. As teacher you are allowed to preview anyway. Note: This quiz is not currently available to your students Preview Finalexam-f0708-v2 Students will see this quiz in a secure window an 4 The system shown is released from rest, accelerates uniformly, and moves 50 cm in 0.50 s. What is the jarks: sae value of M? All surfaces are frictionless. The block on the table has a mass of 3 kg. (g=9.8 m/s) Choose one answer. © a. 0.59Kg © b.0.50Kg © ¢.034Kg O 421K © 2.042Kg 28 © Two slits separated by a distance of d=0.05 mm (mm=millimeter). The are illuminated with light of wavelength Me 2=540 nm (1nm=10*° m). The distance to the screen is L= 0.10 m. How many bands of bright lines are present between the central maximum and the position at 0.12 m? Choose one answer. oO alt oO bi O «111 Oo 41 oO et 38 Marks: 4 Choose one answer. oO a3 Oo »60 O «75 OQ 4375 O e705 48 @ An object weighs 40.0 N in the air , but it weighs 20.0 N when submerged in water. If the same object is then Marks: 4 submerged in a liquid of unknown density, it weighs 25 N.The density of water is1000 kg/m}. What is the density of the unknown liquid (in Kg/m?): Choose one answer. © a. 1100 © b.200 © ©3680 O aru Oo e500 58 ® A closed-open organ pipe of length 2.6 m contains air for which the speed of sound is 340 m/s. The frequency of the Marks: 4 standing wave of the third harmonics is: Choose one answer Qa. 98Hz OQ b.33Hz O ©. 196Hz ©. 4.163 Hz O e.63Hz 6 & A u-shaped tube open to the air at both ends contains mercury initially. Some water is poured into the Mts left arm of the tube until the vertical column of the water reaches a height h,=10 cm. The density of water is 1000 Kg/m' and the density of mercury is 13.7 x103 Kg/m3. What is the height h shown in the Figure (difference between the top levels of Water and mercury ? Choose one answer © a139cm © b.397cm © ¢.278cm OQ 4.265cm © 29.26cm 74 ® A block of mass m=12 Kg hangs in equilibrium from a string with a total length L=5.0 m having a linear mass Marks: 4 density 1=0.001 Kg/m. The string is wrapped (taken around) two frictionless pulleys separated by a distance d=2.0 m (see Figure). At what frequency must the string vibrate in order to form a standing wave in the fundamental mode? .(g=9.8 m/s*) Choose one answer. = Qa. 211 Hz © »b. 140 Hz O ¢12thz OQ 4.242Hz O e.70Hz an 1 @ An ideal monatomic gas having n=0.096 moles undergoes the cyclic process ABCA shown in the Figure, where the jarks: process B to C is isothermal and C to A is straight line. The heat absorbed between A and B is given to be 1012.1J. (1 L=10*? m3, Kpa=10? pa). What is the heat ejected between C and A (Qc.4)? (No unit needed and answer in Joules. Be careful with the sign) (this question needs time) a Df Kuna - -. \ axpa) 400 |. B 200 [------- 100 [ow K Answer: 94 Block A has a mass 3.3 kg and block B has a mass 19.8 kg. The coefficient of kinetic friction between block B and the MBs table is 1»=0.20. Suppose the block B is moving to the right with an acceleration a=2.0 m/s what is the mass of block M, (in Kg). (g=9.80 m/s”) B — a A c) Answer: 104 @ A block of m=4 kg is released from rest at point A (see Figure) slides down a rough surface that is one quarter of Marks: 4 circle R=1.6 m. If the block achieves a speed v,=4.0 m/s at position B, how much work is done on the block by friction as it slides down from position A to B? . (g=9.8 m/s”) A Choose one answer. OQ a-30.72J © b.+3072U O c-T17 OQ 44154) O e-154J 14 @ An object of mass m=2 kg has a speed v=5.0 m/s when it passes the origin (x=0) in its way along the positive x-axis. Marks: 4 If this object is subject to a retarding force F = -(5.0 N/m) x, at what position (x,) does the object stop? Choose one answer. OQ a632m OQ b25m OQ ¢.3.16m © 440m QO e20m 128 Marks: 4 A two-dimensional force is given by the function: F = 2x7i+ Syj {boldface means vector) This force moves an object along two paths: Path 1: from (x.y)=(0,0) to (1,1) along y = x (straight line) Path 2: from (x.y)=(0,0) to (1,1) along y= x? (Parabola) The work done along path 1, W,, compared to W, is: Choose your answer: (1) Wo/W4=1.0 (2) Wo/W=0.50 (3) Wo/W4=0.25 (4) WoW =2.0 (5) WoW =0.333 Choose one answer. a. (4) b. (2) c. (1) d. (3) e. (6) oo00o0°0 13.4 Marks: 4 A stone of mass m=3.0 kg falls from rest in a viscous medium. There is a net force of 22.4 N acting downward on the stone. A retarding (or restoring force) velocity-dependent force is also acting which is given by F=(4.0 N.m/s) v (force proportiona to velocity) . What is the terminal velocity of the stone (in m/s ) . (no unit needed with your answer. Give 2 digits after the point. Answer: 144 Marks: 4 © (ATER RIOWS Htoinla ano alNEISHE OF SIO asl SHOW MAME) Figure below and from the height of 3.0 m. The cross section of the tube A is 0.055 m/, the cross section of the tube B is 0.04 m? and the cross section at C is 0.025 m2. the density of water is 1000 kg/m? . What is the pressure difference between point and point c, ((P,—P,) (in N/m? ) ? (* mean powerf@ftten) Choose one answer. a. zero b. 4.7x10%4 c. 1.8x10"4 d. 5.2x10*3 oo0o0°0 e@. 235x104 15% Marks: 4 The electric fields arriving at a point P on the screen from coherent sources are described by: E,=E sin(ot) E, =E sin(@t+7/4) E,=E, sin(@tt+z/2) What is the amplitude of the resultant field at point P( in terms of Ep? ) a15 b.3.7 c.17 d.1.0 e24 Choose one answer. oo00o0°0 164 © Sound of a frequency 1605.9 Hz enters the tube shown in the Figure below. For what value of x (in cm) will the first Marks: 4 maximum be heard at the exit? Assume the speed of sound to be 340 m/s. Entrance Tube Answer 74 @ Find the change in entropy (in J/KK) when 3.0 moles of an ideal monatomic gas are allowed to expand isobarically [ELSE (constant pressure) from an initial volume of 20 cm! to a final volume of 100 cm’. (R=8.31 Ji(mole . K) Choose one answer Qa. 182K fe) b. 100 JK © ¢.82JiK O 4. 167JK Oo e67JiK i ‘ 4 © A heat pump absorbs heat from the outside air at -15 °C and transfers it into home at a temperature of 30 ° ans C. What is the maximum COP (Coefficient Of Performance) of the heat pump? Choose one answer. © a0 OQ b02 O ©67 O 476 O e44 ve F Two harmonic waves traveling in opposite direction interfere to produce a standing wave given by: as y=(2 m) sin [(x0/2) x] cos (32 t) The distance between the first two antinodes is (in m): Choose one answer. 9 a. 0.8m OQ b4m O 8m OQ 42m O e1m 208 @ what is the specific heat (in J/(Mole . K) of a gas kept at constant volume when it takes 1.0x10*J of heat to raise the Marks: 4 temperature of 5.0 moles of the gas 400 K above its initial temperature? Choose one answer. =O oooo°o a b. c. 24 75 5.0 12.5 10 218 @ A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed Marks: 4 of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +20 J of work on the particle. What is the value of the potential energy at point B? Choose one answer. O a-40oJ O b+) oO c.+40J O 4+65J O e-20J O £4204 228 A thin film has a coating with a refraction index n=1.50 and is on glass having n, =1.60. What is the smallest thickness (EGSEG t (in nm)of this film for which destructive interference can take place by reflection?. The light used has a wavelength 671.4 nm falls nearly vertical on the film. (answer: 2 digits after the point) Answer 23 4 Two harmonic waves described by Mating y, =Gem) sin(8x x/m+2z t/s) y 2=@Gem) sin(87x/m — 27 t/s) What is the smallest positive value of x (in cm) corresponding to a node of the resulting wave? Choose one answer. © a025cm © b.00cm Oo c¢.60cm © 4.1.5cm © e3em 24 © Monochromatic light is used in a double-slit experiment where the slits are d=0.25 mm (mm=millimeter) apart and Marks: 4 the distance to the screen is L=1.0 m. It is known that the spacing between two adjacent (neighboring) dark fringes is 2.2 mm. Assume the angle of deviation is small. What is the wavelength (in nanometer=nm) of the used light? Choose one answer. Qa. 632nm © b.550nm © ¢.520nm © 4.600nm © 2. 650nm 25 & A standing wave with one antinodes exists on a 1.60-m long string which is held fixed at each end. The string vibrates at Maria a frequency of 7.2 Hz. The wave function of this standing wave is: (1) y=A sin (45t) cos (3.9x) (2) y=A cos(45t) sin (1.96x) (3) y=A sin(45t) cos (1.96x) (4) y=A cos (45t) sin (3.9x) Choose one answer. Oo a(t) oO 62 o ¢@) o 4 @ Moodle Docs for this page (Saxe without submitting Submit all and finish You are logged in as rabih Mahmasani (Logout) PHYS210_meid