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- Hint: Aeronautical engineers use this term as a unit of speed. It is a quantity studied in fluid dynamics so it should be related to aerodynamics and aircrafts.
Complete step-by-step solution -
The Mach number (M) is a quantity that is defined as the ratio of the velocity of a body divided by the speed of sound in undisturbed medium through which the body is travelling. It is a dimensionless quantity and it mainly depicts the ratio of flow of speeds.
$M=\dfrac{u}{c}$
Here M denotes the Mach Number
u is the velocity of aircraft
c is the speed of sound in the medium
The correct solution is Aircraft.
Additional information:
The term Mach number is named after an Austrian Physicist and philosopher Ernst Mach. Since Mach is not a unit of measure rather it is a dimensionless quantity it is written as Mach followed by the number for example- Mach 2 and not 2 Mach. When we say an aircraft is moving at Mach 1 its speed at that moment is 343 m/s. If the Mach number is less than one it indicates subsonic flow and if it is greater than 1 it means supersonic flow.
Note: If we take an aircraft flying at say Mach 0.3 then is traveling at 30% of the speed of sound or if we say that a missile is travelling at Mach 2 is traveling at two times the speed of sound.
Complete step-by-step solution -
The Mach number (M) is a quantity that is defined as the ratio of the velocity of a body divided by the speed of sound in undisturbed medium through which the body is travelling. It is a dimensionless quantity and it mainly depicts the ratio of flow of speeds.
$M=\dfrac{u}{c}$
Here M denotes the Mach Number
u is the velocity of aircraft
c is the speed of sound in the medium
The correct solution is Aircraft.
Additional information:
The term Mach number is named after an Austrian Physicist and philosopher Ernst Mach. Since Mach is not a unit of measure rather it is a dimensionless quantity it is written as Mach followed by the number for example- Mach 2 and not 2 Mach. When we say an aircraft is moving at Mach 1 its speed at that moment is 343 m/s. If the Mach number is less than one it indicates subsonic flow and if it is greater than 1 it means supersonic flow.
Note: If we take an aircraft flying at say Mach 0.3 then is traveling at 30% of the speed of sound or if we say that a missile is travelling at Mach 2 is traveling at two times the speed of sound.
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