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Middle School Math
Matemáticas
Middle School Math
Decimales

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Decimales
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 1 A special observatory on a mountain in Siberia monitors the number of meteoroids entering the Earth's atmosphere above the North Pole. It is an automated system that detects the flashes of light caused by their friction with the atmospheric gases. If on average the system detects43per day, what is the estimated annual total number of meteoroids that enter the atmosphere above the pole? Express your answer using scientific notation and assume a non-leap year.
 2 Many small algae are approximately spherical in shape. Professor Glump has made it his life's work to catalog and compare all the spherical algae in the world. He is studying two newly discovered species that differ in diameter by a 1.8 x 10-5m. If the larger of the two species has an average diameter of0.00078m, what is the average diameter of the smaller species? Express your answer using scientific notation.
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 4 With the help of Mr. Bloop, some middle school students measured the growth rate of a fungus. An old fashioned (but still useful) apparatus called a race tube was used. A small piece of the fungus was placed at one end of a long tube that had a layer of growth medium filling it about half way. Then the distance the fungus grew down the tube was measured each day. At the end of four weeks the fungus had advanced22cm along the tube. What was the average speed of advance of the fungus in m/s? Express your answer using scientific notation.
 5 If a micromachine can travel down a microtubule at a rate of 3.2 x 10-3mm per minute, how many meters could it travel in2hours? Express your answer using scientific notation.
 6 Some chemical compounds are so hard to make in the lab that they can only be synthesized in tiny amounts. Professor Sneed has succeeded in making about20picograms of californium hexachloride, an extremely radioactive and unstable compound. After 12 hours, only19% of the compound remains. How much is left? Express your answer in scientific notation and in grams.

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