Per1_over - Period 1: Introduction to Physics 104 1.1...

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Period 1: Introduction to Physics 104 1.1 Ratios and efficiency How can ratios be used for problem solving and to calculate efficiency? 1.2 Exponential Growth and Decay What is the difference between exponential growth and exponential decay? 1.3 Electric Chage and Current How is electric generated? 1.4 Radiant Energy and the Electromagnetic Spectrum What do radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X-rays, and gamma rays have in common? 1-1
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Review of Ratio Reasoning and Efficiency Ratios are fractions, such as 20 miles/1 gallon of gas (20 miles per gallon). Ratios are useful when making comparisons. 15 km/ 3 liters = 5 km/ liter Ratios allow you to convert units. sec meters 20 sec 600 , 3 hour 1 x mile 1 meters 609 , 1 x hour 1 miles 45 = Ratios can be used to find the cost of using electrical energy: $0.10 x 0.600 kW x 2 h = $0.12 kWh Efficiency is the ratio of the useful energy out of the system per total energy put into the system. In Energy Total Out Energy Useful Efficiency = Efficiency can also be written as the ratio of power in units of watts: In Power Out Power Efficiency = 1-2
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M easuring Power with a Wattmeter 1) Plug the wattmeter into the power strip and turn it on. 2) Press the “ Watt I ” button. 3) Clear the meter by adjusting the Zero Adjust knob until the display reads 0 0 0. 4) Plug the appliance into the outlet in the cord attached to the wattmeter. 5) Read the power requirement. 6) Turn the meter OFF when you finish! 1-3 0 0 0 On/Off switch Watt I Zero Adjust knob Plug in appliance
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Linear and Exponential Graphs Trends in Grocery Shopping How has the population grown since 1940? How has home delivery of food changed? How has the number of stores selling food changed? 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 1940 1950 1960 1970 1980 1990 2000 2010 Population Grocery stores 1-4 a Home food deliveries
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Growth Rates Linear Growth Linear growth is constant . Its graph is a straight line because the same amount is added during each time period. The amount added is independent of the initial amount and the number of elapsed time periods. Exponential Growth The graph of exponential growth is has an upward curving line because the amount added increases with each time period. Exponential growth doubles the amount of the quantity during a fixed time period, the doubling time.
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Per1_over - Period 1: Introduction to Physics 104 1.1...

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