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  2. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s.

  3. Speed limits in the United States - Wikipedia

    en.wikipedia.org/wiki/Speed_limits_in_the_United...

    In the United States, speed limits are set by each state or territory. States have also allowed counties and municipalities to enact typically lower limits. Highway speed limits can range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h).

  4. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    Mach number. The Mach number ( M or Ma ), often only Mach, ( / mɑːk /; German: [max]) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. [ 1][ 2] It is named after the Czech physicist and philosopher Ernst Mach . where: M is the local Mach number, u is the local ...

  5. Miles per hour - Wikipedia

    en.wikipedia.org/wiki/Miles_per_hour

    0.44704. Miles per hour ( mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom, the United States, and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.

  6. Supersonic speed - Wikipedia

    en.wikipedia.org/wiki/Supersonic_speed

    Supersonic speed is the speed of an object that exceeds the speed of sound ( Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 343.2 m/s (1,126 ft/s; 768 mph; 667.1 kn; 1,236 km/h). Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic.

  7. What happens if you go 10 mph over the speed limit? - AOL

    www.aol.com/drive-10-mph-over-speed-110000027.html

    Here are the fines associated with speeding: 5 MPH or less: No fine. 5-10 MPH: $25. 10-14 MPH: $100. 14-19 MPH: $125. 19-24 MPH: $150. 24-34 MPH: $500. If you are driving faster than 85 mph, you ...

  8. Hypersonic speed - Wikipedia

    en.wikipedia.org/wiki/Hypersonic_speed

    <614 mph (988 km/h; 274 m/s) Most often propeller-driven and commercial turbofan aircraft with high-aspect-ratio (slender) wings, and rounded features like the nose and leading edges. The subsonic speed range is that range of speeds within which, all of the airflow over an aircraft is less than Mach 1.

  9. Rules of the Road: 25 mph is too fast. Is there a lower speed ...

    www.aol.com/rules-road-25-mph-too-030000807.html

    The maximum speed for the Saturn V rocket was 25,000 mph. The maximum speed of a Bugatti Chiron (the fastest production road car) is 305 mph. The Mitubishi Mirage (the cheapest car available in ...

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