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What comes next?

What comes next?. O T T F F S S E N _?. Tractor Pull. What type of things will you see? What type of tractors could be there? How do tractor pulls work? What type of tools are needed? What are some of the Safety concerns of attending?. Can You Hear Me Now?. Measuring Noise Levels.

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What comes next?

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  1. What comes next? O T T F F S S E N _?

  2. Tractor Pull • What type of things will you see? • What type of tractors could be there? • How do tractor pulls work? • What type of tools are needed? • What are some of the Safety concerns of attending?

  3. Can You Hear Me Now? Measuring Noise Levels

  4. What causes sound? • How can you measure noise levels? • Sound is measured in what units? • Can you name some events or loud noises that causes your ears to ring?

  5. Does the amount of time that you are exposed to this noise determine if your ears ring? Does distance affect the sound intensity? Can loud sounds cause permanent damage to hearing?

  6. How can you find out what level you can safely listen to a specific sound? • What is OSHA? • Occupational Safety Health Administration • OSHA assists in determining work place safety. • What is a dB?

  7. Duration of sound permitted at various sound levels.With out hearing protection Duration in Hrs Sound Level in dB 32 80 16 85 8 90 4 95 3 97 2 100 1.5 102 1 105 0.5 110 0.25 115 none with out OVER 115 hearing protection

  8. What sounds are over 115 dB? • How can you be around noise levels over 115 dB safely? • What is NRR? • Noise reduction ratings.

  9. Decibel (dB) Levels of Common Sounds at Typical Distance From Source 0 Acute threshold of hearing 15 Average threshold of hearing 20 Whisper 30 Leaves rustling, very soft music 40 Average Residence 60 Normal speech, background music 70 Noisy office, inside auto @ 60 mph 80 Heavy traffic, window AC 85 Inside acoustically insulated protective tractor cab in field. 90 OSHA limit—hearing damage on excess exposure to noise above 90 dB. 100 Noisy tractor, power mower, ATV, snowmobile, motorcycle, in subway car, chain saw 120 Thunderclap, jackhammer, basketball crowd, amplified rock music. 140 Threshold of pain—shot gun, near a jet taking off, 50 hp siren (100’)

  10. What is the graph • about?

  11. 2. What is it comparing?

  12. 3. How many milk cows were there in the U.S. in 1993? What about 2002?

  13. What is the dependent • variable?

  14. What is the independent • variable?

  15. According to the graph, there has • been a 5% decrease in milk cows over the last 10 years. Is that a significant decrease? Does the line actually look like only 5%?

  16. Is this the same as the previous graph?

  17. According to the previous graph, milk production decreased by 5% but the number of dairies decreased by 41%. How can this be?

  18. 1.Using the information given on the handout “Duration of Time Permitted At Various Sound Levels”, construct a line graph. Use “Sound Levels in dB” as your x values (independent variable) and the “duration” as your y values (dependent variable).

  19. Y Axis …. Dependent Variable X Axis.... Independent Variable

  20. 2.Using a decibel meter, record the dB levels of 10 different sounds. Construct a bar graph of the information obtained.

  21. How to use the dB meter • Identify the sound recorded • Set the range on the meter • Read the sound level • If the meter says LO move the dial to a lower range • If the meter is maxed out move the range higher • Record your data

  22. Examples of different types of graphs.

  23. What is the graph • about?

  24. 2. What is it comparing?

  25. Why do you think the • eastern part of the US has • such small farms?

  26. Look at the states with the largest farms. What do they have in common?

  27. Texas is a large state, so why do you think the average size farm is • smaller there than in New Mexico?

  28. Why do you think that Oklahoma’s farms are smaller than the two states above and below us?

  29. Are there any questions about sound levels or reading graphs?

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