# Homework 1 - lightyears 2 004(part 1 oF 1 20 points A room...

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Abd Elhai, Mohamed – Homework 1 – Due: Jan 30 2008, 11:00 pm – Inst: Dr Kevin Dean 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. This is ONLINE HOMEWORK No 1 It is due by 09:00 Abu Dhabi time on Thursday morning (23:00 Wedneday in Texas) 001 (part 1 oF 1) 20 points Convert 48 mi / h to m/s. You may need 1 mi = 1609 m. Answer in units oF m / s. 002 (part 1 oF 1) 20 points Suppose your hair grows at the rate oF 1 32 inch per day. ±ind the rate at which it grows in nanome- ters per second. Answer in units oF nm / s. 003 (part 1 oF 1) 20 points A light year is the unit oF distance that light, with a speed oF 2 . 99792 × 10 8 m / s, travels in one year. What is the surFace area oF a planet whose radius is 5900 km? Answer in units oF
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Unformatted text preview: lightyears 2 . 004 (part 1 oF 1) 20 points A room is 14 . 9 Ft deep, 17 . 8 Ft wide and 6 . 73 Ft high. Express the volume oF this room in cubic meters. You will need 1 inch = 2 . 54 cm. Answer in units oF m 3 . 005 (part 1 oF 2) 10 points A structural I beam is made oF iron. A view oF its cross-section and its dimensions is shown in the fgure, where d = 3 cm, w = 30 cm, h = 26 cm and the length (not shown) oF the beam is ‘ = 2 . 07 m. The density oF iron is 7560 kg / m 3 . The atomic weight oF iron is 55.85 g/mol and Avo-gadro number is N A = 6 . 02214 × 10 23 / mol. 30 cm 26 cm 3 cm 3 cm What is the mass oF a section 2 . 07 m long? Answer in units oF kg. 006 (part 2 oF 2) 10 points How many atoms are there in this section? Answer in units oF atoms....
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## This note was uploaded on 02/16/2010 for the course PHYSICS 191262 taught by Professor Najafzadeh during the Spring '09 term at The Petroleum Institute.

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