Bilge keels are passive stability systems. On commercial shipping the bilge keel is the form of a strake, or small keel or blister, running along much of the length of the hull. They are typically fitted one on each side, low down on the side of the hull, so as not to increase the draft of the vessel.
Intensity is a measure of the strength of shaking experienced in an earthquake. The Modified Mercalli Scale represents the local effect or damage caused by an earthquake; the intensity reported at different points generally decreases away from the earthquake epicenter.
The intensity varies with the distance from the source and the power of the source. Power is a property of the light source that describes the rate at which light energy is emitted by the source. Power is often expressed in units of watts.Table 1 shows the dependence of intensity (I) upon the distance (r) from a 60-watt light bulb.Numbers are rounded to the second decimal place. 1996-2012 The Physics Classroom, All rights reserved. Light Intensity The term intensity is used to describe the rate at which light spreads over a surface of a given area some distance from a source.