Case 21 2nd 9 Weeks Study Guide Flashcards
What is the difference between qualitative and quantitative data?
Qualitative data is descriptive (color, size, texture a) quantitative data measured using numbers (height, weight, mass)
Why is skepticism and important part of science?
It allows for the formation of new theories by considering other explanations for the data. Example police officers are skeptical with the evidence that I don’t rule out any possible solutions to a crime
What is an inference?
Inference is a conclusion based on prior knowledge. Observation is information gathered through the senses examples the grass is wet observation. it rained last night. inference
Explain what it means to analyze the data?
Find patterns in the data and list them in order. Ex (smallest to biggest )in relationship to the independent and dependent variable
When should the scientist revise their conclusion?
When their data is not repeatable.
How can technology affect scientific knowledge?
Technology advances scientific knowledge. For example, improvements to the microscope have lead to new discoveries.
What are the formulas for speed and acceleration?
Speed equals distance divided by time, acceleration =(final speed - initial speed) / by time
What determines if an object is in motion?
Change in position
What are three ways an object can accelerate?
Stayed up, slow down, change direction
What type of current does the power grid use? Explain why.
AC current because the voltage can be increased and decreased to travel long distance is and move in both directions.
Explain the functions of each of the following parts of the power grid: substation, transformer, generator, turbine, powerlines.
Substation – step up voltage for long distances
Transformer – decrease voltage before entering home
Generator – produce electricity, turbine – spends the generator
Powerlines – Carrie electricity long distances
What are the products of combustion?
Carbon dioxide and water vapor
Name three gases that contribute to the greenhouse effect.
Carbon dioxide methane and water vapor
Of these three, which one seems to have the biggest impact on temperature increases in our atmosphere?
Carbon dioxide
What to activities have caused the largest increase of greenhouse gases in the atmosphere over the last hundred years?
Burning fossil feuls
Describe the importance of the carbon/oxygen cycle.
Photosynthesis and respiration cycle oxygen/carbon through the atmosphere
What type of energy sources can generate electricity without burning a fuel source?
Wind, solar and hydroelectric (renewable)
What can we do to reduce the effects of global warming?
Drive less, turn off lights, use electricity less, recycle, decrease dependence on fossil feels, plant more trees
How does air pressure relate to wind speed?
When air pressure decreases, wind speed increases
What happens to the density of air when it cools
It increases, which makes it sink
Describe an air mass that forms over each of the following locations: Canada, Gulf of Mexico, North Pacific ocean.
Canada: Cold and dry, Gulf of Mexico: warm and humid, North Pacific ocean: cold and humid
What do each of the following measure: anemometer, barometer, hygrometer?
Anemometer – wind speed, barometer – air pressure, hygrometer – humidity
What type of weather is associated with high pressure system? Explain why.
Clear and sunny skies because moisture cannot rise to condense
What type of weather is associated with a low pressure system? Explain why.
Clouds, rain, maybe thunderstorms because moisture rises to condense
At what latitude line will hurricane move back towards the east?
30 N
What strengthens the hurricane? What weakens a hurricane?
Strengthen – warm water, low pressure
Weaken – land, Coldwater, and high pressure
What is the difference between the easterlies and westerlies
Westerlies blow from the west to east and calls hurricanes to turn away from the United States. Trade winds blow hurricanes from east to west toward the United States
What direction does weather generally move across the United States?
West to east
How does air temperature relate to the amount of water vapor it can hold?
Warmer the air the more water vapor it can hold
Explain how the earths rotation and revolution affect the lengths of days, years, and seasons.
Revolution is orbiting around the sun. It takes one year. It causes the seasons to change along with the tilt. Rotation causes night and day and takes 24 hours. Earth rotates from east to west counterclockwise
Give the number of degrees latitude for each line and give the dates in which the sun is overhead.
Tropic of Cancer – 23.5 N Tropic of Capricorn – 23.5 S equator – zero
