000 feet. At that height, the speed of sound reduces significantly to around 660mph. If none of that made any sense to you, a reductionist way of looking at Mach speed is stating that Mach 1 is roughly 760 mph at sea level, and 660mph ...
It is a car that does 0 to 60 mph in 7.1 seconds. It may not sound like much by today's standards, but it was a big deal back in the 1980s. A 1983 Cobra in black sits right next to it like a Yin and Yang. "It's the car that everybody l...
MRMach Rider(gaming) MRMid-Engine Rear-Wheel Drive MRMilano Red(Honda paint color) MRMaterial Review(engineering) MRMain Rotor MRMagnetorheological(sometimes written as Magneto-Rheological) MRMinimal Residual MRMiddle Reliever(baseball) MRMagneto-Resistive ...
Acceleration is measured in terms of G, or gravity forces. Ejecting from an aircraft is in the 5-G to 20-G range, depending on the type of ejection seat. As mentioned in the introduction, 1 G is equal to the force of Earth's gravity and determines how much we weigh. One G of acc...
This process, also known as reheat, is inefficient but can boost turbofan thrust by as much as 50 percent [sources: Encyclopaedia Britannica; Pratt & Whitney]. Afterburners come in handy during takeoff or in unfavorable, low-speed or low-pressure conditions. They are mostly found in super...
Imagine being hit by a truck—and you'll have some idea why bullets do so much damage!Photo: Now that's what I call kinetic energy! This is what happens when you fire a 7g (0.25 oz) projectile at a velocity of 25,000 km/h (16,000 mph) into a cast aluminum block. This huge ...
(a) How much time has elapsed according to the student's watch? How fast must a meter stick move relative to an observer such that it would measure 8.0 centimeters in length? (Enter answer to five significant figures.) A spaceship is 1600 m long when it...
As the spacecraft starts to reenter the atmosphere, the feather stabilizes it in a flat attitude with the slab-like wings at right angles to the airflow. This creates so much drag in relation to the vehicle's weight (without fuel) that peak heating is moderate. SpaceShipOne is constructed ...
With as much money the Navy has poured into air defense over the last half century, the missiles, sensors, and combat systems all work—and they work well. A U.S. guided-missile destroyer is so good at shooting down missiles, that every real-world intercept so far hasn’t...
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