why are twisting forces important for the container vessel?
930412
Twist in a Container Ship is very Important. As these massive vessels cross the oceans, wave action on the vessel can cause the devices that secure the cargo to either loosen, or break. Thereby losing valuable cargo.  These ships tend to be of the single hull design and are in essence giant canoes.  Prolonged Twist along the central axis, can lead to catastrophic failure of the Hull, and if enough tension is imparted, break the keel. Which leads to the loss of the vessel, cargo and sometimes even the Crew.
823386
Hi Alan the 1st!\nWe neglect the central aperture in CD, then inertia momentum is I=m*r^2/2 for any homogeneous disk, m=0.017kg, r=0.06m. Torq T=I*w’, w’ is angular acceleration, while w=w’*t, w=22 rad/s, t=0.88s, thus T=m*r^2*(w/t)/2, - plug in the proper numbers, be a good boy!
104409
This is a classic problem from hydrodynamics textbooks. The short answer is, it is approximately simple harmonic motion. You can compute the restoring force caused by the displacement of the liquid if you depress a floating boat (Archimedes principle) and that then, balanced with the weight of the boat, creates the conditions for simple harmonic motion. You can approximate the period and amplitude of motion etc. \n\nHowever it gets more complicated than this of course:\n\na. There are damping forces caused by the motion of the boat through the water and the air\n\nb. The water is not completely incompressible, and the density of the water varies some with depth (a tiny effect)\n\nc. There are surface tension effects and entrainment effects\n\nd. The motion of the boat will be more complicated than simple linear motion in one dimension\n\ne. There will probably be deformation effects on the boat, changing its shape\n\nf. gravity is not constant as the boat is moving up and down a small distance in a gravity gradient\n\nand so on. \n\nHowever, the REASON that sines and cosines are so prevalent everywhere in physics is because simple harmonic motion is such a good approximation for so many things. \n\nWhy is this?\n\nWell consider Newton's Second law: F=ma, where F is force, m is mass and a is acceleration. Newton's second law is not always true, in the quantum world and in relativistic situations, but it is true under many conditions, so it is a good place to start. \n\nIn general, the force F will be some sort of nonlinear function of position x:\n\nF=F(x)\n\nHowever, if x is small, then we can approximate F(x) by a McLaurin series:\n\nF ~ F(0) + x F'(0) + h.o.t. \n\n(h.o.t. is a common acronym for higher order terms).\n\nThis then produces the equation for simple harmonic motion, when substituted into Newton's 2nd law:\n\nF(0) + xF'(0) = m d/dt(d/dt(x))\n\nMany other equations in physics like Schrodinger's equation, or wave equations with forcing, or the heat equation, or the inhomogeneous Laplace's equation include 2nd order derivatives, and can similarly be put in some form where simple harmonic motion is the result. So as strange as it seems when you are just learning about SHM in physics, it really is everywhere in all kinds of unexpected places! \n\n\nOne of my favorites is the waves of heat and cold that are travelling down into the earth from the seasonal forcing produced at the surface. Drilling down, one can observe these waves of hot and cold (with some diffusion) going back many years.
415411
In theory it affects the passage of time aboard the vessel IF it travels in the opposite direction of the earth's rotation... I suggest you read some Stephen Hawking.
641452
opposite force being applied
145871
The design of an automobile suspension system includes the actions of tires and suspension springs and roll bars which are often optimized to reduce (but not eliminate) the forces that roll a car outward in the opposite direction of a turn.  See the link.\n\nPerhaps it is easier to "see" the effects of turning if you exaggerate them.  The center of mass (or center of gravity) must be above the pavement and it wishes to continue in a straight line ahead as the tires initiate a turn say to the right.  This makes the center of mass lean left.  Imagine that the the car was say 100 feet tall with its center of mass 50 ft above the ground but with the tires only five feet apart.  It would have to lean away from the turn, right?\n\nThis is unlike a bicycle which has only two wheels and where the rider leans into the turn to avoid falling off.  It is also unlike a speedboat where rudder action allows the boat to lean into a turn.  However a navy Destroyer leans away from the turn in a sharp maneuver because the rudder can not overcome the fact that the center of gravity is below the center of buoyancy to avoid capsizing.
693390
Gravity, centrifugal forces and centripetal forces
511989
Because of the rotation all the molecules in the ring separate a little bit. So there is more tension. The reasen is, that all the molecules need more centripetal force.
128926
When a substance is in liquid state, the cohesion between its molecules is pretty much different from something in a solid state.  Let's say, there is a larger gap between molecules.  This gives the substance a more "flexible" condition.  This flexibility (if we so call it) give the substance the property to adquire the shape of its container and if this container has two ends and a slanted angle... there you go!  It flows!
885093
If the inside is pressurized, the shape has to symmetrical in such a way, that will make the internal pressure distribute itself more or less equally. Else the can may burst where the pressure is more.\nAlso the shape has to have a logical design.\nFor the sake of argument, let us consider others shapes.\n\nSpherical:: well that's not possible. Not very easy to hold !!\nBut yeah, from the physics point of view, its the ideal.\n\nCube and Cuboid :: The corners present can cause unequal pressure distribution, also the strain present may give rise to corrosion.\n\nElliptical:: no comments !!
314804
Foot pushes down lever which lifts a rod which pushes up lid at hindge side.\n\nThe mechanical advantage of the foot strength v weight of lid makes this effortless
1137413
Good grief. Four answerers and the original asker have all bought into a proven urban legend.\n\nIT ISN'T TRUE PEOPLE.\n\nWater will go down either way no matter where you are.\n\nThe twisting effect of the Coriolis force is real and does influence certain large things like the movement of air masses, but the effect is so small that it plays no role in determining the direction in which water rotates as it exits from a draining sink or toilet. The Coriolis effect produces a measurable effect over huge distances and long periods of time, neither of which applies to your bathroom. Toilets and sinks drain in the directions they do because of the way water is directed into them or pulled from them. If water enters in a swirling motion (as it does when a toilet is flushed, for example), the water will exit in that same swirling pattern; as well, most basins have irregular surfaces and are not perfectly level, factors which influence the direction in which water spirals down their drains. The configuration of taps and drains is responsible for the direction of spin given to water draining from sinks and bathtubs to a degree that overwhelms the slight influence of the Coriolis force.\n\nThe belief that the Coriolis force influences the direction in which water drains from plumbing fixtures is widespread and has been repeated as fact in a number of venues, including popular television shows (such as world traveler Michael Palin's Pole to Pole) and even in textbooks. We can only speculate on why people are so enamored of this snippet of misinformation, guessing that it has something to do with the desire to find some of the mysteries of science in the realm of the everyday.
991659
the key to the tip is the "movable block".  mechanical advantage refers to the relationship between how far (how hard) you pull the rope versus how much the load moves.  if you have a rope running through a fixed block and down to a load, you can change the direction of force (you pull down, the load goes up), but you have no mechanical advantage.  for every foot you pull the rope, the load goes up one foot.  \n\nif you have a fixed block and a movable block attached to a load and the rope runs through the fixed block (F) once, down to the movable block (M), through M and back up to F, you have two parts through M (one down and one up).  if you attach a load to M and pull, the load goes up 1/2 foot for each foot of rope you pull, so you have a 2:1 mechanical advantage.  remember, the rope running through F at the top isn't giving you any mechanical advantage, its just changing the direction of your pull from up to down.  if you stood above M and pulled up, you'd get the same 1/2 foot up for each foot you pulled and the same 2:1 mechanical advantage.  \n\nso yes, the tip seems to work.  try it on paper for some other blocks, for example, double blocks at F and M.  \n\ngood luck!
18279
I've never heard of it in quite that term? but what I think you are referring to, is the onboard Crane, Davits, block & tackle, or Chain Bindings. \n"Equipment to assist in moving onboard cargo". Since Ships pitch & roll to the seas in a storm. They are required to secure the ships cargo from shifting. If this were to happen... The vessel could loose stability, & list to one side, to possible catastrophic affect.
832148
You could just use the old force = (G*M*m)/r^2\nWhat is missing from the diagram is that the small weights were held by a long thin wire.  The wire formed a weak torsional spring.  If there were some gravitational force, it would cause the weights to twist the wire until the torque of the twisted wire matched the force of gravitation (times the radius).  He could measure the amount of twist by shining a light at a mirror attached to the weights and seeing how far the reflection moved.
291004
if an object is floating, the buoyant force on it equals its weight -- the vertical forces have to sum to zero.  try drawing a free body diagram to convince yourself of this.
1134656
Liquid takes the shape of its own container.