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# hw2_soln - 2.011 HW 2 Solution Set Problem 1(10 points a(3...

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2.011 3/13/06 HW# 2 Solution Set Problem 1: (10 points) a. (3 points) Three points for something feasible (actually anything will do here). 1 point for something useful or convincing. b. (4 points) One point for description, two for spatial and temporal scales, and one for expected results. c. (3 points) Three points for cost. Problem 2: (10 points) a. (2 points) The deepest part of the ocean is The Marianas Trench between 10,911 m (Kaiko March 24 th , 1995), which is the most accurate reading. Other reports are deeper by as much as 11,040.04. As a comparison Mt. Everest is 8444.43 m high. Located at approximately 11º 19’N latitude and 142 15’E longitude, in the Pacific Ocean. b. (2 points) 1º latitude = 111 km. 1º longitude = 111 cosine (latitude) km. Pg 21 ST. c. (3 points) The speed of sound in water is a function of temperature, depth, and salinity. Pg 35 ST. d. (3 points) From Pg 35 ST. If the speed of sound is plotted as a function of depth there is usually a minimum around 1000m. The depth of minimum sound speed is the sound channel . A sound channel can carry sound up to 10,000 km away. It occurs in all oceans, and it usually reaches the surface at higher latitudes. In the sound channel sound can travel very far, sometimes half way around the earth. Sound rays that begin to travel outside the channel are directed back to the sound channel. I like to think of it as a large fiber optic cable for sound. Problem 3: (10 points) a. (2 points) The Pacific (according to Google Earth) along the equator lies at 80º 6’ 34 W and 103º 48’ 46 E, which is 19565 km or 12157.6 miles (~183º 54’). This is an assumption that the earth is generally spherical and uses google earth.

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