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Percents
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1.   Racer Joe made four laps around Smallville racetrack with an average speed of 179.6 miles per hour. Speedy Bob made a set of four laps with an average speed of 197.4 miles per hour. Bob's speed was what percent of Joe's speed? Round your answer to the nearest hundredth of a percent.

2.   * This is a pre-made sheet.
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3.   Mr. Bloop drives 15 kilometers at an average speed of 53 km/hr. Mrs. Bloop drives the same distance at an average speed that is 3% faster than Mr. Bloop's. How long does it take her to travel the 15 km distance? Round your answer to the nearest hundredth of a minute.

4.   It is an interesting fact that the total volume of two liquids can change when the liquids are mixed together. This is because of a change in the intermolecular forces that attract or repel the individual liquid molecules from each other. Shelby repeats a classic experiment where she mixes one liter of pure water with one liter of pure ethanol and measures the volume of the combined liquids. She records the new volume to be 1.95 liters. The volume decreased by what percent? Round your answer to the nearest hundredth of a percent if needed.

5.   The pressure at which a liquid boils is by definition the pressure that equals the atmospheric pressure pushing back on the surface of the liquid. Water boils at 100C at sea level where the pressure is 1 standard atmosphere. If at a higher altitude the water boils at 99.6C, the pressure must then be a bit less than 1 atmosphere. In this example, by what percent did the boiling temperature change? Round your answer to the nearest hundredth of a percent.

6.   Let's say that a certain force exerts a pressure of 17 Pascals on a square area. If the force is slowly increased until the pressure is 129% of the original pressure, what is the new pressure?


 


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