Ship Construction and Stability Final
in small angles stability theory, the metacenter is located at the intersection of the inclined vertical centerline and a vertical line through
B
initial stability is indicated by
GM
subtracting KG from KM yields
GM
the difference between the height of the metacenter and the height of the center of gravity is
GM
what is used as an indicator of initial stability
GM
what abbreviation represents the height of the center of buoyancy
KB
subtracting GM from KM yields
KG
topside icing decreases stability because it increases
KG
for a given displacement, the righting arm has its maximum value when
KG is minimum
deballasting a double bottom has what affect on KG?
KG will increase
which formula can be used to calculate metacentric height
KM-KG
vertical moments are obtained by multiplying a vessel's weight and its
VCG or KG
buoyancy is a measure of a ship's
ability to float
initial stability of a vessel may be improved by
all of the above (: removing loose water, adding weight low in the vessel, closing crossover valves between partly filled double bottom tanks)
intact buoyancy is a term used to describe
an intact space below the surface of a flooded area
the center of buoyancy and the metacenter are in the line of action of the buoyant force
at all times
initial stability refers to stability
at small angles of inclination
which action will best increase the transverse stability of a merchant vessel at sea?
ballasting the double bottom tanks
if the metacentric height is small, a vessel will
be tender
the geometric center of the underwater volume of a floating vessel is the center of
buoyancy
the upward pressure of displaced water is called
buoyancy
the water is which a vessel floats provides vertical upward support. the point through which this support is assumed to act is known as the center of
buoyancy
a vessel behaves as if all of its weight is acting downward through the center of gravity, and all its support is acting upward through the
center of buoyancy
stability is determined by the relationship of the center of gravity and the
center of buoyancy
stability is determined principally by the location of the center of gravity and the
center of buoyancy
the center of the underwater volume of a floating vessel is the
center of buoyancy
the center of volume of the immersed portion of the hull is called the
center of buoyancy
the geometric center of the underwater volume is known as the
center of buoyancy
a floating vessel will behave as if all its weight is acting downward through the
center of gravity
stability is determined principally by the location of two points in a vessel: the center of buoyancy and the
center of gravity
when cargo is shifted from lower hold to the main deck the
center of gravity will move upwards
if the vertical center of gravity (VCG) of a ship rises, the righting arm (GZ) for the various angles of inclination will
decrease
a vertical shift of weight to a position above the vessel's center of gravity will
decrease the righting moment
the purpose of the inclining experiment is to
determine the lightweight center of gravity location
a vessel's KG is determined by
dividing the total vertical moment summation by displacement
stability is determined principally by the location of the point of application of two forces: the upward-acting buoyant force and the
downward-acting weight force
metacentric height is an indication of a vessel's stability
for small angles of inclination
which is an indication of reserve buoyancy
freeboard
in the absence of external forces, the center of gravity of a floating vessel is located directly above the
geometric center of the displaced volume
the center of buoyancy is located at the
geometric center of the displaced volume
your vessel rolls slowly and sluggishly. this indicates that the vessel
has poor stability
aboard a vessel, diving the sum of the vertical moments by the total weight yields the vessel's
height of the center of gravity
the difference between the height of the metacenter and the metacentric height is known as
height of the center of gravity
the important stability parameter, KG, is defined as the
height of the center of gravity above the keel
when a vessel is floating upright, the distance from the keel to the metacenter is called the
height of the metacenter
when initial stability applies,the height of the center of gravity plus the metacentric height equals the
height of the metacenter
which would NOT provide extra buoyancy for a vessel with no sheer?
higher bulwark
the waterplane area is described as the intersection of the surface of the water in which a vessel floats and the
hull
transverse stability calculations require the use of
hydrostatic curves
topside icing decreases vessel stability because it is usually off-center and
increases the height of the center of gravity
the vertical distance between G and M is used as a measure of
initial stability
what is not usually a concern when loading a single-hulled tanker
initial stability
metacentric height is a measure of
initial stability only
in small angle stability, the metacentric height
is calculated by subtracting KG from KM
which statement is TRUE about metacentric height
it is a measure of initial stability
a moment is obtained by multiplying a force by its
lever arm
the magnitude of a moment is the product of the force and the
lever arm
the purpose of the inclining experiment on a vessel is to determine the
location of the center of gravity of the light ship
the principal danger form ice collecting on a vessel is the
loss of stability
what will NOT decrease the stability of a vessel?
lowering a weight suspended by a boom onto the deck
you must shift a weight from the upper tween deck to the lower hold. this shift will
make the vessel stiffer
in small angle stability, when external forces exist, the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the
metacenter
the point to which your vessel's center of gravity (G) may rise and still permit the vessel to have positive stability is called the
metacenter
for a floating vessel, the result of subtracting KG from KM is the
metacentric height
the abbreviation GM is used to represent the
metacentric height
the important initial stability parameter, GM, is the
metacentric height
what is the stability term for the distance from the center of gravity (G) to the Metacenter (M), when the small-angle stability applies
metacentric height
which will be a result of removing on-deck containers
metacentric height will increase
the difference between the height of the metacenter and the height of the center of gravity is known as the
metacentric hieght
the result of multiplying a weight by a distance is a
moment
if a vessel lists to port, the center of buoyancy will
move to port
when a vessel is inclined at a small angle the center of buoyancy will
move toward the low side
a vessel with a small GM will
provide a comfortable ride for the crew and passengers
addition of weight above the center of gravity of a vessel will ALWAYS
reduce initial stability
addition of weight to a vessel will ALWAYS
reduce reserve buoyancy
the volume of a vessel's intact watertight space above the waterline is its
reserve buoyancy
the horizontal distance between the vertical lines of action of gravity and the buoyant forces is called the
righting arm
when a vessel has positive stability, the distance between the of force through B and line of force through G is called the
righting arm
when positive stability exists, GZ represents the
righting arm
the righting moment can be determined by multiplying the displacement by the
righting arm (GZ)
at all angles of inclination, the true measure of a vessel's stability is the
righting moment
for a vessel inclined by the wind, multiplying the buoyant force by the horizontal distance between the lines of action of the buoyant and gravity forces gives
righting moment
a slow and easy motion of a vessel in a seaway is an indication of a
small GM
the TCG(transverse center of gravity) of a vessel may be found by dividing the displacement of the vessel into the
sum of the transverse moments of the vessel
the KG of a vessel is found by dividing the displacement into the
sum of the vertical moments of the vessel
what will happen when cargo is shifted form the main deck into the lower hold of a vessel?
the GM will increase
what is the definition of transverse metacenter
the point to which G may rise and still permit the vessel to possess positive stability
the weight of a liquid displaced by a vessel floating in sea water is equal to the
total weight of the vessel
aboard a vessel, diving the sum of the transverse moments by the total weight yields the vessel's
transverse position of the center of gravity
reserve buoyancy is
transverse watertight bulkheads OR the watertight portion of a vessel above the waterline
the moment of a force is a measure of the
turning effect of the force about a point
stability is determined principally by the location of the point of application of two forces: the downward-acting gravity force and the
upward-acting buoyant force
a virtual rise in the center of gravity may be caused by
using an on board crane to lift a freely swinging heavy object
the value of the maximum righting arm depends on the position of the center of buoyancy and the
vertical location of the center of gravity
on a vessel, multiplying a load's weight by the distance of the load's center of gravity above the baseline results in a(n)
vertical moment
if the result of loading a vessel is an increase in the height of the center of gravity, there will always be an increase in the
vertical moments
at all angles of inclination, the metacenter is
vertically above the center of gravity
when a vessel is inclined by an external force, the
vessel's center of gravity shifts to the center of the vessel's underwater hull
reserve buoyancy is the
volume of intact space
the enclosed area defined as the intersection of the surface of the water and hull of a vessel is the
waterplane
