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Unformatted text preview: yoon (jey283) – HW #1 – Antoniewicz – (57380) 1 This printout should have 15 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Assuming that 68 . 8% of the Earth’s surface is covered with water at average depth of 1 . 31 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 crosssection and dimensions is shown. 24 cm 29 cm 2 cm 2 cm What is the mass of a section 2 . 26 m long? The density of iron is 7560 kg / m 3 , the atomic weight of iron is 55 . 85 g / mol and Avogadro’s 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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This note was uploaded on 02/18/2011 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.
 Spring '08
 Turner
 Physics, Work

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