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Supersonic Speeds

1

Supersonic travel is a rate of travel of an object that exceeds the speed of sound.

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

Training for supersonic speed by CNN

2

For objects traveling in dry air of a temperature of 20 °C at sea level, this speed is approximately 343 mh.

Mean sea level is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.

A temperature is an objective comparative measure of hot or cold.

F-22 Raptor Supersonic Speed and Extreme High-G manuevers. by Military Zone HD

3

Speeds greater than five times the speed of sound are often referred to as hypersonic.

4

Flights during which only some parts of the air surrounding an object, such as the ends of rotor blades, reach supersonic speeds are called transonic.

In aeronautics, transonic refers to the condition of flight in which a range of velocities of airflow exist surrounding and flowing past an air vehicle or an airfoil that are concurrently below, at, and above the speed of sound in the range of Mach 0.8 to 1.0, i.e. 965–1,236 km/h at sea level.

5

This occurs typically somewhere between Mach 0.8 and Mach 1.23.

6

Sounds are traveling vibrations in the form of pressure waves in an elastic medium.

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

7

In gases, sound travels longitudinally at different speeds, mostly depending on the molecular mass and temperature of the gas, and pressure has little effect.

8

Since air temperature and composition varies significantly with altitude, Mach numbers for aircraft may change despite a constant travel speed.

In fluid dynamics, the Mach number is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound.

An aircraft is a machine that is able to fly by gaining support from the air.

9

In water at room temperature supersonic speed can be considered as any speed greater than 1,440 m/s.

Colloquially, room temperature refers to the range of temperatures that people tend to prefer for indoor settings.

10

In solids, sound waves can be polarized longitudinally or transversely and have even higher velocities.

11

Supersonic fracture is crack motion faster than the speed of sound in a brittle material.

A material is brittle if, when subjected to stress, it breaks without significant deformation.

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