Docstoc

Measurement - Unit Conversions

Document Sample
Measurement - Unit Conversions Powered By Docstoc
					      CH. 2 - MEASUREMENT


       III. Unit Conversions
I
             (p. 40 - 42)
II

III
    A. SI Prefix Conversions
1. Find the difference between the
   exponents of the two prefixes.

2. Move the decimal that many places.


                    To the left
                     or right?
A. SI Prefix Conversions

   532 m      0.532
           = _______ km



NUMBER     =     NUMBER

 UNIT           UNIT
                         A. SI Prefix Conversions
                         Prefix      Symbol   Factor
                         mega-         M       106
                         kilo-         k       103
                         BASE UNIT     ---     100
            move right
move left




                         deci-         d       10-1
                         centi-        c       10-2
                         milli-        m       10-3
                         micro-               10-6
                         nano-         n       10-9
                         pico-         p       10-12
 A. SI Prefix Conversions

1) 20 cm =         0.2
             ______________ m

                   32
2) 0.032 L = ______________ mL

3) 45 m =       45,000
             ______________ nm

                0.0805
4) 805 dm = ______________ km
    B. Dimensional Analysis
 The “Factor-Label” Method
   Units, or “labels” are canceled, or
    “factored” out


             g
       cm   3
               3
                 g
            cm
    B. Dimensional Analysis
 Steps:
  1. Identify starting & ending units.
  2. Line up conversion factors so units
     cancel.
  3. Multiply all top numbers & divide by
     each bottom number.
  4. Check units & answer.
    B. Dimensional Analysis
 Lining up conversion factors:


           1 in = 2.54 cm
                =1
         2.54 cm 2.54 cm


           1 in = 2.54 cm
                1=
           1 in     1 in
       B. Dimensional Analysis
  How many milliliters are in 1.00 quart of
     milk?
qt                                             mL
1.00 qt         1L       1000 mL
                                   = 946 mL
              1.057 qt     1L


          
       B. Dimensional Analysis
 You have 1.5 pounds of gold. Find its
     volume in cm3 if the density of gold is
     19.3 g/cm3.
lb                                             cm3

1.5 lb 1 kg 1000 g 1 cm3
                                    = 35 cm3
         2.2 lb    1 kg    19.3 g
       B. Dimensional Analysis
 How many liters of water would fill a
   container that measures 75.0 in3?

 in3                                      L

75.0 in3 (2.54 cm)3      1L
                                  = 1.23 L
           (1 in)3    1000 cm3
       B. Dimensional Analysis
5) Your European hairdresser wants to cut
  your hair 8.0 cm shorter. How many
  inches will he be cutting off?
cm                                      in

     8.0 cm 1 in
                      = 3.2 in
            2.54 cm
     B. Dimensional Analysis
 6) Taft football needs 550 cm for a 1st
      down. How many yards is this?
cm                                          yd
550 cm      1 in     1 ft 1 yd
                                 = 6.0 yd
          2.54 cm 12 in 3 ft
     B. Dimensional Analysis
7) A piece of wire is 1.3 m long. How many
   1.5-cm pieces can be cut from this wire?


cm                                  pieces
1.3 m 100 cm      1 piece
                             = 86 pieces
         1m       1.5 cm

				
DOCUMENT INFO
Shared By:
Stats:
views:211
posted:3/20/2008
language:English
pages:14