1 XL â or EXL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992). 2  Xln â Crystalline (minerals). 3  XLPE-Cross-linked Polyethylene. 4  XMAC â Cross-Multipole Array Acoustic log.
When the frequency approaches 120 CPM (2 Hz), occupants perceive the ride as harsh. Consequently, the suspension of the average family sedan will have a natural frequency of about 60 to 90 CPM. A high-performance sports car will have a stiffer suspension with a natural frequency of about 120 to 150 CPM (2 to 2.5 Hz). Originally, human sensitivity to ride frequency was believed to be associated with the natural oscillations of an adult human body during a walking gait.
Rating Newest Oldest. Best Answer: Most car batteries are called 12 volt, although when running, can go as high as 14 volts. But the battery is still called a 12 volt system. Amps are the driving force, and battery amperage can be as low as 200 amps for small cars, to maybe 1000 amps, for larger vehicles.mps are the driving force, and battery amperage can be as low as 200 amps for small cars, to maybe 1000 amps, for larger vehicles.