Download Speed is the rate of motion

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Σε φιλώ,
Άγγελος
The AVERAGE SPEED of a common snail is 1 mm/sec.
On the other hand, the AVERAGE forest fire SPEED is 1.000 mm/sec, related to an
AVERAGE wind SPEED of 10.000 mm/sec.
At the same time, the AVERAGE SPEED of an Aerial fire-fighting, Search and
Rescue aircraft, is 100.000 mm/sec
At the end, the snail is burnt and wet,
The snail is dead.
SPEED is the rate of motion.
As a physical property represents primarily instantaneous SPEED.
In real life we often use AVERAGE SPEED, which is rate of total distance and time
interval.
Filmed in the burnt forest
around the village of ASSEA
ARCADIA
GREECE
Summer 2007.
The AVERAGE SPEED of a common snail is 0,0036 Km/h that equals to 1 mm/sec.
On the other hand, the AVERAGE forest fire SPEED is 3,6 Km/h or 1.000 mm/sec,
related to an AVERAGE wind SPEED of 5 Beaufort that equals to 36 Km/h or 10.000
mm/sec
At the same time, the AVERAGE SPEED of a Canadair CL-215, Aerial fire-fighting,
Search and Rescue aircraft, is 360 Km/h or 100.000 mm/sec
At the end, the snail is burnt and wet,
The snail is dead.
SPEED is the rate of motion.
As a physical property represents primarily instantaneous SPEED.
In real life we often use AVERAGE SPEED, which is rate of total distance and time
interval.
Filmed in the burnt forest
around the village of ASSEA
ARCADIA
GREECE
Summer 2007
AVERAGE SPEED
A film by Angelos Spartalis
Written & directed by Angelos Spartalis
Music by OBLIVION, Antonis Papaspyros
Produced by Angelos Spartalis & Angela Svoronou
Wish You Luck film productions © 2007
Speed is the rate of motion.
As a physical property represents primarily instantaneous speed.
In real life we often use average speed, which is rate of total distance and time
interval.
The Average Speed of a common snail is 1 mm/sec.
The Average forest fire speed is 5 Km/h
Related to an average wind speed of 5 Boufort that equals to 30 Km/h
The average speed of a Canadair CL-215 Aerial fire-fighting / Search and Rescue
aircraft is 290 Km/h
At the end, the snail is burned and wet,
The snail is dead.
Speed is the rate of motion, or equivalently the rate of change in position, many times
expressed as distance d traveled per unit of time t.
Speed is a scalar quantity with dimensions distance/time; the equivalent vector
quantity to speed is known as velocity. Speed is measured in the same physical units
of measurement as velocity, but does not contain the element of direction that velocity
has. Speed is thus the magnitude component of velocity.
In mathematical notation, it is simply:
Note that "S" is speed.
Objects that move horizontally as well as vertically (such as aircraft) distinguish
forward speed and climbing speed.
Average speed
Speed as a physical property represents primarily instantaneous speed. In real life we
often use average speed (denoted ), which is rate of total distance (or length) and time
interval. For example, if you go 60 miles in 2 hours, your average speed during that
time is 60/2 = 30 miles per hour, but your instantaneous speed may have varied.
In mathematical notation:
Examples of different speeds
Below are some examples of different speed (see also main article Orders of
magnitude (speed)):
Speed of a common snail = 0.001 m/s; 0.0036 km/h; 0.0023 mph.
A brisk walk = 1.667 m/s; 6 km/h; 3.75 mph.
Olympic sprinters (average speed over 100 metres) = 10 m/s; 36 km/h; 22.5 mph.
Speed limit on a French autoroute = 36.111 m/s; 130 km/h; 80 mph.
Top cruising speed of a Boeing 747-8 = 290.947 m/s; 1047.41 km/h; 650.83 mph;
(officially Mach 0.85)
Official air speed record = 980.278 m/s; 3,529 km/h; 2,188 mph.
Space shuttle on re-entry = 7,777.778 m/s; 28,000 km/h; 17,500 mph.
the speed of sound in air (Mach 1) is about 340 m/s, and 1500 m/s in water
Taipei 101 Observatory Elevator = 1010 m/min ; 16.667 m/s ; 60.6 km/h; 37.6 mph
Units
Units of speed include:
meters per second, (symbol m/s), the SI derived unit
centimeters per second, (symbol cm/s)
kilometers per hour, (symbol km/h)
miles per hour, (symbol m/h)
knots (nautical miles per hour, symbol kt)
Mach, where Mach 1 is the speed of sound; Mach n is n times as fast.
Mach 1 ≈ 343 m/s ≈ 1235 km/h ≈ 768 mph (see the speed of sound for more detail)
speed of light in vacuum (symbol c) is one of the natural units
c = 299,792,458 m/s
Other important conversions
1 m/s = 3.6 km/h
1 mph = 1.609 km/h
1 knot = 1.852 km/h = 0.514 m/s
Vehicles often have a speedometer to measure the speed.
Beaufort
5
m/s
9
km/h
knots
miles/h
34
18
21
The average speed of a Canadair CL-215 Aerial fire-fighting / Search and Rescue
aircraft is 290 Km/h
Take-off Speed 88kts (163km/h)
Landing Speed 85kts (157km/h)
Cruise Speed
160 - 170kts (296 - 315km/h)
Maximum Speed 187kts (346km/h)
Forest fire spread and intensity were modeled as a function of wind and fuel. Spread rate and
intensity of forest fire were related to weight and thickness of forest fuel beds and to wind
speed. Forest fire spread rate and fire intensity were differentiated according to wind speed.
Rapid wind speed causes a faster forest fire spread rate and greater fire intensity than does
slow wind speed. Relative burning time of the fire from beginning to end in the model was 161
sec at a wind speed of 0.5m/sec and 146 sec at 1m/sec on the model Average forest fire spread
rate was 0.014m/sec at a wind speed of 0.5m/sec and 0.020m/sec at 1 m/sec, Average fire
intensity was 0.183kW/m at a wind speed of 0.5m/sec, o.259kW/m at 1m/sec. Fire intensity
was greater when forest fire spread rate was rapid.