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Unformatted text preview: mata (jpm2873) HW #1 Antoniewicz (57420) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Assuming that 72 . 5% of the Earths surface is covered with water at average depth of 1 . 82 mi, estimate the mass of the water on Earth. One mile is approximately 1.609 km and the radius of the earth is 6 . 37 10 6 m. Answer in units of kg. 002 (part 1 of 2) 5.0 points A structural I beam is made of iron. A view of its cross-section and dimensions is shown. 29 cm 26 cm 3 cm 3 cm What is the mass of a section 1 . 89 m long? The density of iron is 7560 kg / m 3 , the atomic weight of iron is 55 . 85 g / mol and Avogadros number is 6 . 02214 10 23 atoms / mol. Answer in units of kg. 003 (part 2 of 2) 5.0 points How many atoms are there in this section? Answer in units of atoms. 004 10.0 points One cubic meter (1.0 m 3 ) of aluminum has a mass of 2700 kg, and a cubic meter of iron has a mass of 7860 kg....
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- Spring '08