PHY101. CHAPTER 1 Measurement Unit Significant Figures Dimensional Analysis. 1.1. Measurement Units. SI - International Metric System US - Customary System Basic Metric Units. SI Prefixes. Metric Line. Conversion Table. Temperature Conversion. Converting Fahrenheit to Celsius.
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Converting Fahrenheit to Celsius
Converting Celsius to Fahrenheit
Example 1: Convert 50 mph to m/s.
From 1 mile = 1609 m:
Example 2: A hall bulletin board has an area of 2.5 m2. What is this area in cm2?
Because 1m=100cm it is sometimes assumed that 1 m2 = 100cm2, which is WRONG. The correct conversion is:Conversion in Metric system
The number of significant figures of a numerical quantity is the number of reliably known digits it contains.
Example 1: Find the area of a room 2.4 m by 3.65 m:
2.4m x 3.65m = 8.76m2=8.8m2 Rounded to 2 sf - because 2 is least # of sf
Example 2: Given the numbers 23.25, 0.546, and 1.058
add the first two
subtract the least number from the firstSignificant Figures - Practice
Example 1: Is an equation x = v t a correct equation?
x - is the distance in m
v = is the velocity in m/s
t - is the time in s
Dimensionally the equation is:
Example 1: Is an equation x = a t2 a correct equation?
a is acceleration in m/s2Dimensional Analysis - Practice
Show that the equation x = xo + vt, where v is velocity, x and xo are lengths, ant t is time, is dimensionally correct
A Boeing 777 jet has a length of 209 ft. 1 inch, and wingspan of 199 ft and 11 inches. What are these dimensions in meters?
Determine the number of significant figures:
The two sides of right triangle are 8.7 cm (two significant figures) and 10.5 cm (three significant figures). What is the area of the triangle?Practice