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SPH4UI Lecture 1 Notes - The Burns Home Page

SPH4UI Lecture 1 Notes - The Burns Home Page

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Units...<br />

• SI (Système International) Units:<br />

• mks: L = meters (m), M = kilograms (kg), T = seconds (s)<br />

• cgs: L = centimeters (cm), M = grams (gm), T = seconds (s)<br />

• British Units:<br />

• Inches, feet, miles, pounds, slugs...<br />

• We will use mostly SI units, but you may run across some<br />

problems using British units. You should know where to look to<br />

convert back & forth.<br />

Ever heard of Google<br />

Converting between different<br />

systems of units<br />

• Useful Conversion factors:<br />

• 1 inch = 2.54 cm<br />

• 1 m = 3.28 ft<br />

• 1 mile = 5280 ft<br />

• 1 mile = 1.61 km<br />

• Example: convert miles per hour to meters per second:<br />

mi mi ft 1 m 1 hr m<br />

1 1 5280 0.447<br />

hr hr mi 3.28 ft 3600 s s<br />

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