The arm is able to move the heads from the hub to the edge of the drive. The arm and its movement mechanism are extremely light and fast. The arm on a typical hard-disk drive can move from hub to edge and back up to 50 times per second — it is an amazing thing to watch!
The arm is able to move the heads from the hub to the edge of the drive. The arm and its movement mechanism are extremely light and fast. The arm on a typical hard-disk drive can move from hub to edge and back up to 50 times per second — it is an amazing thing to watch!
Following liftoff and after the vehicle reaches twice the speed of sound, the air-augmented rockets would shut off. Propulsion would then be provided by the air-breathing rocket vehicle, which will inhale oxygen for about half of the flight to burn fuel. The advantage of this is it won't ...
Such a vehicle would eventually travel at about 56 mi/sec (90 km/sec), which would be more than 200,000 mph (324,000 kph). That speed is about 10 times faster than the space shuttle's orbital speed of 5 mi/sec (8 km/sec). To give you an idea how fast that is, you could ...
How to Meet Sound Limits In Portable ClassroomsHighlights the 2004 ASHRAE Winter Meeting in the U.S. Attendees; Topics discussed; Concerns addressed.Ashrae Journal
Intermodal traffic, which has grown more than 60 percent in the last decade, is expected to jump another 60 percent in the next few years. Fast intermodal trains roll across the Colorado high plains on the Santa Fe line as Q-trains and on the nearby Union Pacific line as Z-trains or "...
Hypersonic speed is five times the speed of sound. Scientists measure speeds this fast with a Mach number, named for Austrian physicist Ernst Mach. Sound has a speed of Mach 1 and anything Mach 5 or above is considered hypersonic. While the speed of sound changes depending on temperature and...
The optimal speed for melody road is 44kph, but people say it is not always easy to get the intended sound. “You need to keep the car windows closed to hear well,” wrote one Japanese blogger. “Driving too fast will sound like playing fast forward, while driving around 12mph [20km...
The X-15 was the experimental grandchild of Chuck Yeager's X-1, which first broke the sound barrier at Mach 1.06 (702 mph, or 1,130 kph), and is ancestor to the space shuttle and modern space planes [source: Darling]. As for air-breathing, powered airplanes, Eldon W. Joersz set ...
The arm is able to move the heads from the hub to the edge of the drive. The arm and its movement mechanism are extremely light and fast. The arm on a typical hard-disk drive can move from hub to edge and back up to 50 times per second — it is an amazing thing to watch!