Lecture2PHY2048

# Lecture2PHY2048 - PHY2048 Physics with Calculus 1 Meet...

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PHY2048 - Physics with Calculus 1 Meet: Periods 4, 5 (10:40-11:30, 11:45-12:35) M W F. Prof. Rinzler Office: NPB 2251 Ph: 392-5656 [email protected] Office Hrs, Grading… see Syllabus on course web site: Goto www.phys.ufl.edu , The Syllabus is mandatory reading . You MUST attend the period for which you are registered Only e-mail to this address will receive a reply. Click “Courses”, “PHY2048” Prof. Mueller Office: NPB 2370 Ph: 392-8521 [email protected] Instructors:

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First part of reading, homework & exam schedule: Complete schedule at www.phys.ufl.edu . Click “Courses”, “PHY2048”, “Schedule”.
Bam, Iran, population ~100k after magnitude 6.5 earthquake (2003). Tragically ~25,000 dead L.A., CA, USA population ~20M after magnitude 6.7 earthquake (1994). 54 dead. Knowledge is power . Not just the power to destroy, but power to save lives. (Here appreciation of the physical principles that led to implementation of building construction codes for earthquake tolerant structures)

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Scientific and Engineering Notation 6000000000000 m Meant to handle large and small numbers Distance to Pluto decimal Representation scientific engineering Radius of hydrogen atom 0.0000000000530 m 6.00x10 11 m 5.30x10 -11 m 6.00e11 m 5.30e-11 m Common Prefixes Giga – 10 9 Mega – 10 6 Kilo 10 3 milli 10 -3 micro – 10 -6 nano 10 -9 e.g. 1 nanometer = 1x10 -9 m 5 kilometers = 5x10 3 m
Fundamental Physical Quantities Composite Quantities (combinations of above) e.g. length velocity time = velocity Acceleration time = 2 mass length Force time = 2 kg m s = (Newtons) : m s 2 : m s SI Units meter (m) Second (s) Kilogram (kg) Length (distance) Time Mass

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How important are units? Mars Climate Orbiter Cost: \$125 millon 4 years to build Launched Dec. 1998 Time to Mars: 10 months Crashed on planet! Why? Lockheed-Martin sent thruster specifications to navigation programmers at NASA-Jet Propulsion Laboratories (JPL) in English units (pounds) but JPL thought they were specified in metric units (Newtons) .
Converting units Consider: 1 min = 60 sec 60 s 1 1min = Rearrange to make conversion factor Suppose want to convert to seconds. 1hr 60min = Now, 1 hr = 60 min. s 60 min = multiplying something by this, is equivalent to multiplying by 1 (so long as we retain the units!) s 60 min 60 =⋅ 1 3600 s =

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Suppose we want to know how many generations there have been since the first known hominid fossils dated to be ~6.5 million years old. 1 generation = 20 year year 20 generation Then, 2 66 years years 6.5x10 years 20 130x10 generation generation ⋅= Huh. .. ? That’s is not meaningful. We needed the years to cancel out. We needed the inverse of this conversion factor, i.e. This method is very general. 65 1 generation 6.5x10 year 3.25x10 generation 20 year ⎛⎞ = ⎜⎟ ⎝⎠ Estimate: So we each have at least 325,000 generations of great grandparents
Suppose you’re on the highway, traveling at 110 km/hr (~70 mi/hr), tailgating 10 m (~3 car lengths) behind a truck, and you glance at the CD player for 2 seconds to bump it to your favorite tune.

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Lecture2PHY2048 - PHY2048 Physics with Calculus 1 Meet...

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