Additional Real World Applications for Radical Expressions - Njit

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					Additional Real World Applications
      for Radical Expressions



                 Section 5-6
               March 2, 2011
            Fellow: Brooke Odle
           Teacher: Ms. Sanchez
          Saint Vincent Academy
            Financial Planning
• A financial planner has been asked to
  determine the inflation rate for homes.
• To calculate the inflation of homes that
  increases from p1 to p2 over n years, the
  annual rate of inflation (expressed as a
  decimal) can be modeled as:
                   1 
                     
      p2         n 

      p1 
  i                    1
         
                  Medicine
• Doctors can approximate the Body Surface
  Area of an adult (in square meters) using an
  index called BSA where H is height in
  centimeters and W is weight in kilograms:


                        H W
             BSA 
                        3600
 Geology/Meterology/Oceanography
• The Pacific Tsunami Warning Center is
  responsible for monitoring earthquakes that
  could potentially cause tsunamis in the Pacific
  Ocean. Through measuring the water level and
  calculating the speed of a tsunami, scientists can
  predict arrival times of tsunamis.
• The speed (in meters per second) at which a
  tsunami moves is determined by the depth d (in
  meters) of the ocean:
                               g is acceleration due to gravity,

         s        g d        which is 9.8 meters per square
                               second
         Electrical Engineering
• To measure voltage (V, measured in volts),
  electrical engineers use the following formula:


     V  PR
  Where P is power
  (measured in watts)
   and R is resistance
  (measured in ohms)
          Physics/Engineering
• Physicists and engineers may study how force
  affects objects. A force is a vector (magnitude
  and direction) and vectors have components
  based on direction (x, y, z). To find the total
  force (resultant force), the following formula
  can be used:
                                               Fy
                                                    Fx
         Ft  F  F  F
                    x
                     2
                            y
                             2
                                   z
                                    2


                                          Fz
                                  Physics/Engineering
 • Example: Research on shoulder movement
   during wheelchair propulsion      Researchers
                                                                                                                           use the
                                                                                                                       SmartWheel to
                                                                                                                       determine the
                                                                                                                        forces at the
                                                                                                                        hand when it
                                                                                                                           hits the
                                                                     Image courtesy of out-front.com
                                                                                                                        handrim for
                                                          Ft  Fx2  Fy2  Fz2                                           each push

Image courtesy of Dubowsky et al, 2009: Dubowsky SR, Sisto SA, and Langrana NA. 2009. “Comparison of kinematics, kinetics, and EMG
throughout wheelchair propulsion in able-bodied and persons with paraplegia: An: integrative approach.” Journal of Biomechanical Engineering,
131.
 Supply Chain Management/Business
• You are a purchasing manager for a medical
  device company. You are responsible for
  directing the way the company buys, stores,
  and sells supplies to other companies.

• You want to reduce the company’s
  warehousing costs by ordering the supplies
  needed to produce the medical devices just in
  time to use them.
 Supply Chain Management/Business
• In order to determine the most economic order
  quantity E for parts used in production of the medical
  devices, you need to use the following formula:
                          2* A* S
                    E
                              I
   – A is the quantity the plant will use in one year
   – S is the cost of setup for making the device
   – I is the cost of holding one unit in stock for one year
• Find E if S = $6,000, A = 25, and I = $140.
• Answer: 46 (You can’t order a fractional quantity, so
  round down to 46.)

				
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