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.
Amp Hours, or Ah, is the capacity of the battery. How much current a battery can delivery starting a car is called cold cranking amps. A deep cycle marine battery will typically be more than 40Ah. A 40Ah car battery at 50% charge will more than likely start your car in fair weather.Cold weather is another story. So, to get a completely dead car battery to 50% - 20Ah-would be maybe two days of full sunlight-with only a 50% charge, or about 12.2 Volts.t will take forever and a day to charge a deeply discharged deep cycle battery.......... consider that a small 110v battery charger is putting out 3-5 amps (or 3 x 110 =330 Watts) and the alternator on a car is putting out 20 to 50 amps at 14 volts (280 to 730 Watts). Source(s):