Download Holt Physical Science California Edition by Christie, Ph.D. Borgford, Mapi, Ph.D. Cuevas, Leila Dumas, PDF

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By Christie, Ph.D. Borgford, Mapi, Ph.D. Cuevas, Leila Dumas, Mary Kay Hemenway, John, Jr., Ph.D. Krupczak

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Your teacher will know what to do. Your teacher may send the injured student to the school nurse or to a doctor. However, if an injury requires immediate attention, your teacher may have to perform first aid. First aid is emergency treatment for someone who is hurt or sick. First aid is not complete medical treatment for an injury. It is only temporary care to be given until more complete medical care can be given. You should not perform first aid unless you have received special training to do so.

In this unit, you will learn about how scientific progress is made and how scientists conduct investigations. Scientists ask meaningful questions to guide their investigations. Scientists use a variety of tools to collect, analyze, and understand their results. This timeline identifies some events that were the result of scientific investigations. 2 Unit 1 1903 Willem Einthoven, a Dutch physician, develops the first electrocardiograph machine to record the tiny electric currents in the body’s tissues.

The Importance of Boat Efficiency Most boats that have propellers are only about 70% efficient. Boat efficiency is important because it saves many resources. S. boats and ships just 10% more efficient would save millions of liters of fuel per year. Based on their observations and all of this information, Czarnowski and Triantafyllou were ready to ask a question: How can boat propulsion systems be made more efficient? This is a good example of a question that can start a scientific investigation because it is a question that can be answered by observation.

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