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# Speed of Sound

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### Speed of Sound

1. 1. 1 COMPUTER/LAB PROJECTCOMPUTER/LAB PROJECT One two three fourOne two three four
2. 2. 2
3. 3. 3 WHAT IS THE SPEED OF SOUND • The speed of sound is 1130 ft/second at 20 degrees C. • The speed of sound is 758 m/hr at 20 degrees C. • It varies with elevation due to air pressure, air density, and temperature.
4. 4. 4 How does speed travel in different states of matter? • Sound travels fastest in a solid. • Sound travels slower in a liquid. • Sound travels the slowest in air. • The closer the particles in a substance the faster sound travels. • Think of a clank underwater in a swimming pool.
5. 5. 5 Formulas • Speed = distance/time • Mach speed = Speed miles per hour/758 miles per hour. • Conversion = ft/sec x 60sec/1min x 60min/1hour x 1mile/5280ft • Convert the fastest Equla 22 at around 1700 ft/sec to mph – does it make a sonic boom?
6. 6. 6 Fastest Human • His name is Usain Bolt • He is one of the fastest. • He can run 100 meters in 9.6 seconds. • Mr. Albrandt would be a close second. • Tyson Gay can jet also. U sain Bolt
7. 7. 7 Fastest Car • The fastest car was the British made Thrust SSC. • It could travel 760.1 miles per hour. • And yes it did break the speed of sound!
8. 8. 8 MORE ON FAST CAR • They had to run in the desert salt flats to have enough room. • It took 250000 gallons of fuel to complete project – much of it was raised with internet donations. • The cockpit was like a jet plane with many computers.
9. 9. 9 SPEED FACTS • SPEED NEVER HAD A BAD DAY • SPEED KILLS • YA GOT SPEED – EVERYTHING ELSE WILL FOLLOW • YA CAN’T TEACH SPEED • HAVE SPEED – WILL TRAVEL WITH EXTREME QUICKNESS
10. 10. 10 Fastest Plane • The fastest plane is the X- 43. • It can move at 7000 miles per hour. • Converting that to Mach speed you are traveling at Mach 9.6. • Now that is what I call speed. • It is rumored that Skunk Works may have a plane that can do Mach 10
11. 11. 11 FASTEST PLANE VIDEO LINK • http://www-pao.ksc.nasa.gov/kscpao/videos/meta
12. 12. 12 Why is xr-71 so hot in a high cold place? • As you go up in elevation temperature drops because of sparse particle placement. • The temperature gets to be –70 degrees C at 80000 feet elevation. • Even though it is so cold the friction caused by the planes excessive speed makes the plane hot.
13. 13. 13 My reaction time to hit a 95 mph fastball. • Web site for activity http://www.exploratorium.edu/baseball/reactionti • My reaction time was .25 seconds. • How fast are you?
14. 14. 14 What is a shock wave? • As a plane travels faster than the speed of sound it pushes the air in front of it. • The waves cannot travel faster than the speed of sound so they pile up. • These piled up waves are called shock waves.
15. 15. 15 Factors that affect the speed of sound in air. • Temperature of the air. • Density of the air. • Altitude that you are at.
16. 16. 16 Some key term definitions. • Speed is distance traveled per time. • Mach is the speed of sound which is 758 miles per hour at 20 degrees C. • Kinetic is a term related to motion. • Sonic boom is created by shock waves moving out from plane towards ground and going through a sudden pressure change that hits your eardrum.
17. 17. 17 Websites to consider. • http://www.pbs.org/wgbh/nova/barrier/men.html • http://www.exploratorium.edu/baseball/reactionti • http://www.grc.nasa.gov/WWW/K-12/a
18. 18. 18 Lab procedure • Measure baseball pitching distance of 60.5 feet from pitching mark to wall. • Have someone time the ball from release to when it hits the wall. • Record the total distance and total time in feet and seconds. • To get speed divide distance by time. • To get speed in miles per hour use dimensional analysis formula above. • To get Mach number divide this value by 758 miles per hour.
19. 19. 19 Extra Credit • Randy Johnson threw a baseball that killed a bird in a professional baseball game. • He can throw a baseball just over 100 mph. • http://www.youtube.co m/watch? v=viI2YQoucBE&wat ch_response