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Percents
Math
Middle School Math

 

Name _____________________________
Date ___________________
Percents
Complete.

1.   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 99.8C, 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.

2.   Two objects are suspended 5 meters in the air by a string. One object has a mass of 3 kg and the other has a mass of 3.68 kg. What is the difference in potential energy of the two objects expressed as a percent? Round your answer to the nearest hundredth of a percent if needed.

3.   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. Victoria 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 1.8 liters. The volume decreased by what percent? Round your answer to the nearest hundredth of a percent if needed.

4.   Emily used a pole to push a boat along the canal in megalopolis. She applied a force of 67 N and accelerated the boat at 0.35 m/s2. Later she was on another boat and the same pushing force resulted in an acceleration of 0.25 m/s2. The mass of the second boat was what percent the mass of the first boat? Round your answer to the nearest hundredth of a percent.

5.   * This is a pre-made sheet.
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6.   Mr. Bloop drives 18 kilometers at an average speed of 57 km/hr. Mrs. Bloop drives the same distance at an average speed that is 1% faster than Mr. Bloop's. How long does it take her to travel the 18 km distance? Round your answer to the nearest hundredth of a minute.


 


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Percents
Math
Middle School Math