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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

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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:

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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:

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**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, which is 9.8 meters per square second

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**Electrical Engineering**

To measure voltage (V, measured in volts), electrical engineers use the following formula: Where P is power (measured in watts) and R is resistance (measured in ohms)

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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 Fz

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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 handrim for each push Image courtesy of out-front.com Image courtesy of Dubowsky et al, 2009: Dubowsky SR, Sisto SA, and Langrana NA “Comparison of kinematics, kinetics, and EMG throughout wheelchair propulsion in able-bodied and persons with paraplegia: An: integrative approach.” Journal of Biomechanical Engineering, 131.

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**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.

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**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: 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.) Ans: 46

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1 of 8© Boardworks Ltd 2008. 2 of 8© Boardworks Ltd 2008 If the ending force acting on an object is not zero, all the forces are said to be unbalanced.

1 of 8© Boardworks Ltd 2008. 2 of 8© Boardworks Ltd 2008 If the ending force acting on an object is not zero, all the forces are said to be unbalanced.

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