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Percentuali
Matematica
Middle School Math
Percentuali

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Percentuali
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 1 Alyssa used a pole to push a boat along the canal in megalopolis. She applied a force of60N and accelerated the boat at0.31m/s2. Later she was on another boat and the same pushing force resulted in an acceleration of0.28m/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.
 2 Ohm's law states that the voltage drop across a resistance is equal to the current flow through the resistor times the resistance of the resistor (V = IR). An apparatus is set up to make sure the voltage drop across the resistor is kept at a constant10volts. Two circuits are tested. In one the resistance (R1) of a single resistor is1,100ohms and in the second circuit the resistance of resistor (R2) is1,800ohms. Assuming Ohm's law holds perfectly true, the current (I) through R1should be greater than that of R2by what percent? Round your answer to the nearest hundredth of a percent.
 3 Mr. Bloop drives18kilometri ad una velcoità media di52km/hr. Mrs. Bloop drives the same distance at an average speed that is3% 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.
 4 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 at100C al livello delmare dove la pressione è1standard atmosphere. If at a higher altitude the water boils at99.4C, the pressure must then be a bit less than1atmosphere. In this example, by what percent did the boiling temperature change? Round your answer to the nearest hundredth of a percent.
 5 Due oggetti sono sospesi3meters in the air by a string. One object has a mass of2kg e l'altro ha una massa di2.47kg. 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.
 6 Cody's soapbox racer completed a half-mile course in4minuti e8seconds. Samuel's car completed the same course in2minuti e35seconds. The average speed of Samuel's car was what percent of Cody's? Round your answer to the nearest hundredth of a percent.

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