What is the speed of Mach 1.9 in kilometres/hour ?

Question

What is the speed of Mach 1.9 in kilometres/hour ?

please reply asap :)

Answer 1

Mach is not constant it depends completely on altitude

http://www.aviationearth.com/Theory/Mach...

Mach 1: 1062 km/h

Mach 1.9: 2017.8 km/h (at 40,000 feet or higher)

Mach 1.9: 1093 km/h (at 30,000 feet)

Mach 1.9:1138 km/h (at 20,000 feet)

Mach 1.9:1182 km/h (at 10,000 feet)

Mach 1.9: 1223 km/h (at sea level)

I got this using a converter so it is accurate

Answer 2

Mach number is dependent on the temperature of the medium you are travelling in. Let's say you are travelling in air with a temperature of 25 degrees Celsius and you are going Mach 1. To find your speed in kmph, you need to know the speed of sound in the medium. The formula is a=sqrt(gamma*R*T) where a is speed of sound in medium, gamma for air is 1.4 and T is temperature in Kelvin. R is the gas constant for air which is 287J/Kg*K. So for our senario, T is 25+273, therefore speed of sound is 346m/s. Converting 346m/s to kmph, you get about 1245.6 km/h. So knowing the speed of sound in the medium, the formula for finding Mach 1.9 in km/h is V=M*a.

So multiplying 1.9 by 1245.6, you get 2366.6 km/h. The colder it get, the smaller the velocity/speed to get to Mach 1.9. Hope this helped. Check out my other answer below:

http://answers.yahoo.com/question/index;...

Answer 3

The Mach number refers to the speed of sound, indicating the ratio between the speed of an object and the speed of sound - in other words if the Mach number is 1, the object is moving at the speed of sound - but there's a hitch. The speed of sound varies with altitude since it depends on the density of the medium through which the sound travels. If the altitude is low, let's say sea level, the speed of sound is high (1,225.1 km/hr at 59 degrees Fahrenheit/15 Degrees Centigrade). So at sea level, 1.9 Mach would come out to be 2,327.69 km/hr.

Since when you go up in altitude, the density goes down, the speed of sound at let's say 15 km altitude would only be 1,062.3 km/hr and 1.9 Mach would correspond to 2018.37 km/hr. So, to know the correct answer, you have to know the exact atmospheric conditions.

Answer 4

Further to manolito's reply, the speed of sound depends only on temperature (it is proportional to the square root of Kelvin temperature), not on air density.

Answer 5

Mach is not a constant number: it depends on altitude and the medium of which an object is passing.(wikipedia)

Generally though, 1 mach is sometimes referred to as the speed of sound which is 1,062 km/hr, which in answer to your question would be 2017.8 km/hr (given that you are referring to "Mach" under the conditions of the cruising altitude of a commercial jet (11,000- 20,000 meters)

Answer 6

Speed of sound  { mach } is close to 1000 kph at sea level altitude changes the speed of sound there for mach. is changed. So I would guess about 2000 kph.

Answer 7

i believe 200 kph.

Answer 8

You will need to provide the local speed of sound. Or atleast the temperature of the environment at which the speed of Mach 1.9 is observed.

This is because Mach number is a ratio and not an absolute value.