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Chapter 2: Measurement and Problem Solving Date:____________ Section 4: Unit Conversions - Notes Objectives: Convert between units. Convert units raised to a power. Unit Conversions: Question: How many seconds are in 532 days? Units are _____________________, ___________________, and _________________________ like any other algebraic quantities. Using units as a guide to solving problems is called _____________________________________ o Always write every number with its __________________________________________. o Do not let units ______________________________________________ in calculations. Units must flow logically from beginning to end. o Conversion factors are ________________ constructed from any two quantities known to be equivalent. o Conversion factors can be _________________ because they are equal to 1 and the inverse of 1 is 1. In solving problems, always check if the ___________________________ are correct, and consider whether or not the magnitude of the answer makes sense. When converting quantities with units raised to a power, the conversion factor must also be ____________________________________________. Practice: 1. Convert 7.8 km to miles. 2. Convert 0.825 m to millimeters. 3. One lap of a running track measures 255 m. To run 10.0 km, how many laps should you run? 4. A circle has an area of 2659 cm2. What is its area in square meters? 5. An automobile engine has a displacement (a measure of the size of the engine) of 289.7 in.3 What is its displacement in cubic centimeters?