week1-2 - Units System There are many systems of units When...

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1 Units System There are many systems of units When solving problems, use the same system for different quantities. Then covert it to any other systems at the end . For this class we usually use the SI system ( International System of Units). SI Length – hand, foot, mile,… meter Time – sundial, water clock, second Mass – pound, ton, gram… kilogram Volume – peck, bushel, cup … cubic meter Area - acre, square mile, hectare square meter 1/7/2011
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2 Conversions, prefixes and scientific notation giga 1,000,000,000 10 9 billion mega 1,000,000 10 6 million kilo 1,000 10 3 thousand centi 1/100 0.01 10 -2 hundredth milli 1/1000 0.001 10 -3 thousandth micro 1/1,000,000 1/10 6 10 -6 millionth nano 1/1,000,000,000 1/10 9 10 -9 billionth 1 in 2.54cm 1cm 0.394in 1ft 30.5cm 1m 39.4in 3.281ft 1km 0.621mi 1mi 5280ft 1.609km 1lb 0.4536kg g =9.8 1kg 2.205lbs g=9.8 Appendix b 1/7/2011
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3 From Wikipedia : The Mars Climate Orbiter (formerly the Mars Surveyor '98 Orbiter) was one of two NASA spacecraft in the Mars Surveyor '98 program , ……. The Mars Climate Orbiter was intended to enter orbit at an altitude of 140.5–150 km (460,000-500,000 ft.) above Mars. However, a navigation error caused the spacecraft to reach as low as 57 km (190,000 ft.). The spacecraft was destroyed by atmospheric stresses and friction at this low altitude. The navigation error arose because
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This note was uploaded on 02/13/2012 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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week1-2 - Units System There are many systems of units When...

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