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

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

Can You Hear Me Now? Measuring Noise Levels

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

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?

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

Duration of sound permitted at various sound levels. With out hearing protection Duration of sound permitted at various sound levels. With out hearing protection Duration in HrsSound Level in dB none with out OVER 115 hearing protection

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

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

1. What is the graph about?

2. What is it comparing?

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

4. What is the dependent variable?

5. What is the independent variable?

6.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%?

Is this the same as the previous graph?

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

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).

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

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

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

Examples of different types of graphs.

1. What is the graph about?

2. What is it comparing?

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

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

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

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

Are there any questions about sound levels or reading graphs?