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4 Pages

### HW 4

Course: PHYS 116, Fall 2011
School: Washington
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Word Count: 944

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pointsWalker4 1./1 26.P.005.My Notes | Sunlight enters a room at an angle of = 29 above the horizontal and reflects from a small mirror lying flat on the floor. The reflected light forms a spot on a wall that is d = 1.6 m behind the mirror, as shown in the figure. If you now place a pencil under the edge of the mirror nearer the wall, tilting it upward by 5.0, how much higher on the wall (y) is the spot?...

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pointsWalker4 1./1 26.P.005.My Notes | Sunlight enters a room at an angle of = 29 above the horizontal and reflects from a small mirror lying flat on the floor. The reflected light forms a spot on a wall that is d = 1.6 m behind the mirror, as shown in the figure. If you now place a pencil under the edge of the mirror nearer the wall, tilting it upward by 5.0, how much higher on the wall (y) is the spot? cm 2./1 pointsWalker4 26.P.010.My Notes | A 10.0footlong, nearsighted python is stretched out perpendicular to a plane mirror, admiring its reflected image. If the greatest distance to which the snake can see clearly is 26.0 ft, how close must its head be to the mirror for it to see a clear image of its tail? ft 3./1 pointsWalker4 26.P.026.My Notes | A small object is located 14.0 cm in front of a concave mirror with a radius of curvature of 40.0 cm. Where will the image be formed? (Enter a negative value if the image forms behind the mirror.) cm 4./2 pointsWalker4 26.P.029.My Notes | An object with a height of 42 cm is placed 1.8 m in front of a concave mirror with a focal length of 0.80 m. Find the location and magnification of the image produced by the mirror, using the mirror and magnification equations. d = m M = 5./2 pointsWalker4 26.P.031.My Notes | An object with a height of 42 cm is placed 2.0 m in front of a convex mirror with a focal length of 0.40 m. Find the location and magnification of the image produced by the mirror using the mirror and magnification equations. d = m M = 6./4 pointsWalker4 26.P.033.My Notes | A magician wishes to create the illusion of a 2.21mtall elephant. He plans to do this by forming a virtual image of a 75.0 cm tall model elephant with the help of a spherical mirror. (a) Should the mirror be concave or convex? concave convex Explain. (b) If the model must be placed 3.00 m from the mirror, what radius of curvature is needed? (Include the sign of each answer.) m (c) How far from the mirror will the image be formed? (Enter a negative value if the image forms behind the mirror.) m 7./3 pointsWalker4 26.P.035.My Notes | Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. You find that you can project a magnified image of a light bulb onto the wall of your bathroom if you hold the mirror 1.4 m from the bulb and 5.4 m from the wall. (Include the sign of each answer.) (a) What is the magnification of the image? (b) Is the image erect or inverted? erect inverted (c) What is the focal length of the mirror? m 8./1 pointsWalker4 26.P.053.My Notes | Light enters a container of liquid at an angle of 44 to the normal; the refracted beam makes an angle of 33 with the normal. Calculate the index of refraction this of liquid. 9./3 pointsWalker4 26.P.055.My Notes | (a) The angle of refraction of a ray of light traveling through an ice cube is 31. Suppose the ice melts, but the angle of refraction remains the same. Is the corresponding angle of incidence greater than, less than, or the same as it was for ice? less than greater than the same as Explain. (b) Calculate the angle of incidence for part (a) (for water). 10./1 pointsWalker4 26.P.056.My Notes | A submerged scuba diver looks up toward the calm surface of a freshwater lake and notes that the Sun appears to be 41 from the vertical. The diver's friend's standing on the shore of the lake. At what angle above the horizon does the friend see the sun? 11./3 pointsWalker4 26.P.064.My Notes | A glass paperweight with an index of refraction n rests on a desk, as shown in the figure. An incident ray of light enters the horizontal top surface of the paperweight at an angle = 75 to the vertical. (a) Find the minimum value of n for which the internal reflection on the vertical surface of the paperweight is total. (b) If is decreased, is the minimum value of n increased or decreased? increased decreased Explain. 12./5 pointsWalker4 26.P.089.My Notes | A friend tells you that when she takes off her eyeglasses and holds them 24 cm above a printed page the image of the print is erect but enlarged to 1.3 times its actual size. (a) Is the image real or virtual? real virtual How do you know? (b) What is the focal length of your friend's glasses? cm (c) Are the lenses in the glasses concave or convex? concave convex Explain. 13./2 pointsWalker4 26.P.077.My Notes | A concave lens has a focal length of 35 cm. Find the image distance and magnification that results when an object is placed 21 cm in front of the lens. (Use the proper sign convention for both quantities.) image distance magnification cm 14./3 pointsWalker4 26.P.082.My Notes | You have two lenses at your disposal, one with a focal length f1 = +37.5 cm, the other with a focal length f2 = 37.5 cm. (a) Which of these two lenses would you use to project an image of a light bulb onto a wall that is far away? lens with focal length f1 lens with focal length f2 Explain. (b) If you want to produce an image of the bulb that is enlarged by a factor of 1.60, how far from the wall should the lens be placed? m 15./2 pointsWalker4 26.P.083.My Notes | Two lenses that are L = 46 cm apart are used to form an image, as shown in figure. Lens 1 is converging and has a focal length f1 = 15 cm; lens 2 is diverging and has a focal length f2 = 7.0 cm. (a) Determine the distance from lens 1 to the final image. cm (b) What is the magnification of this image?
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Washington - PHYS - 116
1./2 pointsWalker4 28.P.004.My Notes |A person driving at v = 18 m/s crosses the line connecting two radio transmitters at right angles, as shown in the figure (d1 = 570 m and d2 = 190 m). The transmitters emit identical signals in phase with each other,
Washington - PHYS - 116
1./3 pointsWalker4 29.P.012.My Notes |An elementary particle called a pi meson (or pion for short) has an average lifetime of 2.6 10 s when at rest. Suppose that a pion moves with a 8speed of 0.995c relative to Earth. (a) Find the average lifetime of t
Washington - PHYS - 116
./2 pointsWalker4 29.P.091.My Notes |A small star of mass m orbits a supermassive black hole of mass M.(a)Find the orbital speed of the star if its orbital radius is 5R, where R is the Schwarzchild radius (R=2GM/c ).2 c(b) Repeat part (a) for an orb
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1.1/1 pointsAll Submissions NotesQuestion: ZumChemP6 17.E.014.Calculate the sodium ion concentration when 65.0 mL of 3.2 M sodium carbonate is added to 25.0 mL of 1.6 M sodium bicarbonate. M2.1/1 pointsAll Submissions NotesQuestion: ZumChemP6 17.E.018.
Washington - CHEM 162 - 162
Page 1 of 11Name and ID: Quiz Section:Anders Conway AC Lab Partner: Jordan CoxExperiment 2: Chemical KineticsPart I: A Clock Reaction Part II: Crystal Violet-Hydroxide Reaction Note: All sections of this report must be typed.!By signing below, you ce
Washington - CHEM 162 - 162
Page 1 of 11Name and ID: Quiz Section:Anders Conway AC Lab Partner: Jordan CoxExperiment 2: Chemical KineticsPart I: A Clock Reaction Part II: Crystal Violet-Hydroxide Reaction Note: All sections of this report must be typed.!By signing below, you ce
Washington - CHEM 162 - 162
1./2.5 pointsNotesQuestion: ZumChemP6 14.E.010.What hybridization is required for central atoms that have the following arrangement of electron pairs? a tetrahedral arrangement of electron pairs a trigonal planar arrangement of electron pairs a linear ar
Washington - CHEM 162 - 162
1.1/1 pointsAll Submissions NotesQuestion: ZumChemP6 15.E.064.How is the rate of a reaction affected by each of the following? (a) activation energy the larger the activation energy, the slower the rate activation energy has no effect on the rate of reac
Washington - CHEM 162 - 162
1.2/2 pointsAll Submissions NotesQuestion: ZumChemP6 16.E.044.A certain form of lead has a cubic closest packed structure with an edge length of 492 pm. Calculate the value of the atomic radius and the density of lead. density g/cm3atomic radiuspm2.1
Washington - CHEM 162 - 162
1.2/2 pointsAll Submissions NotesQuestion: ZumChemP6 18.E.012.What is the valence electron configuration for alkaline earth metals? (Use n to denote a generic number.) List some common properties of alkaline earth metals. (Select all that apply.) easily
Washington - CHEM 162 - 162
1.2/2 pointsAll Submissions NotesQuestion: ZumChemP6 19.E.006.Write electron configurations for each of the following. (a) Ti, Ti , Ti2+ 4+(b) Re, Re , Re2+3+(c) Ir, Ir , Ir2+3+Ti Ti Ti2+Re Re Re2+Ir Ir Ir2+4+3+3+2.4/4 pointsAll Submissi
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Washington - PHYS - 115
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Washington - PHYS - 115
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Washington - PHYS - 115
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Washington - PHYS - 115
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Washington - PHYS - 115
1./6 pointsNotesQuestion: Walker4 23.P.034.A long, straight wire carries a current I. Three small metal rings are placed near the current carrying wire (A and C) or directly on top of it (B). If the current in the wire is flowing towards the left and is
Washington - PHYS - 115
1./1 pointsNotesQuestion: Walker4 17.P.006.After emptying her lungs, a person inhales 4.3 L of air at 3.5 C and holds her breath. How much does the volume of the air increase as it warms to her body temperature of 37 C? L2./1 pointsNotesQuestion: Walker
Washington - PHYS - 115
1.1/1 pointsAll Submissions NotesQuestion: ZumChemP6 17.E.014.Calculate the sodium ion concentration when 65.0 mL of 3.2 M sodium carbonate is added to 25.0 mL of 1.6 M sodium bicarbonate. M 2.1/1 pointsAll Submissions NotesQuestion: ZumChemP6 17.E.018.
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Washington - CHEM - 152
1.5/5 pointsAll Submissions NotesQuestion: ZumChemP6 9.E.015.Consider the accompanying diagram. Ball A is allowed to fall and strike ball B. Assume that all of ball A's energy is transferred to ball B, at point I, and that there is no loss of energy to o
Washington - CHEM - 152
1.5/5 pointsAll Submissions NotesQuestion: ZumChemP6 9.E.015.Consider the accompanying diagram. Ball A is allowed to fall and strike ball B. Assume that all of ball A's energy is transferred to ball B, at point I, and that there is no loss of energy to o
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HW 41.3.42/3.84 pointsAll Submissions NotesQuestion: ZumChemP6 11.E.018.Calculate values for the following cells. Which reactions are spontaneous as written (under standard conditions)? Balance the reactions. Standard reduction potentials are found i
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Washington - PHYS - 142
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Washington - PHYS - 142
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