Answer Happy

8. + -/1 points SerEssen1 1.P.041. My Notes Ask Your Teacher You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth surface of water. The resulting oil slick will be approximately one molecule thick. Given an oil droplet of mass 8.00 x 107 kg and density 1138 kg/m3 that spreads out into a circle of radius 41.8 cm on the water surface, what is the order of magnitude of the diameter of an oil molecule? 9. + -/2 points SerEssen1 1.P.044. My Notes + Ask Your Teacher Sphere 1 has surface area A1 and volume V1, and sphere 2 has surface area A2 and volume V2. If the radius of sphere 2 is 3.0 times the radius of sphere 1, what is the ratio of each of the following? (a) the areas, A2/A1 (b) the volumes, V2/V1 10. + -14 points SerCP10 1.P.048. My Notes Ask Your Teacher A woman measures the angle of elevation of a mountaintop as 12.0°. After walking 6.00 km closer to the mountain on level ground, she finds the angle to be 14.0° (a) Draw a picture of the problem, neglecting the height of the woman's eyes above the ground. Hint: Use two triangles. Select variable names for the mountain height (suggestion: y) and the woman's original distance from the mountain (suggestion: x) and label the picture. Choose File No file chosen (b) Using the labeled picture and the tangent function, write two trigonometric equations relating the two selected variables. (Use the following as necessary: x and y. Do not enter units in your answers.) tan(120) = tan(14) = (c) Find the height y of the mountain by first solving one equation for x and substituting the result into the other equation. y = km