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
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
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
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
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
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
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
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
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
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
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
Factors that affect the speed of
sound in air.
• Temperature of the air.
• Density of the air.
• Altitude that you are at.
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.
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
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
