Eventually, as the cord continues to unwind, the surface of the water assumes a concave shape as it acquires the motion of the bucket spinning relative to the experimenter.

The shape of the surface becomes concave to balance the centrifugal force against the other forces upon the liquid.

A simpler system, developed later, uses a concave disc ( or a pair of them ) set at a large angle to the direction of progress, that uses the concave shape to hold the disc into the soil – unless something hard strikes the circumference of the disk, causing it to roll up and over the obstruction.

The main advantage of wok beyond its constructed material is its curved concave shape.

The cardiac notch is a concave impression molded to accommodate the shape of the heart.

In shape it is like the sickle ( drepanē, δρεπάνι ), to which it was compared by the ancients: the concave side, with the city and harbour of Corfu in the centre, lies toward the Albanian coast.

Calculations are further complicated by the effects of shadowing and thermal " reillumination ", whether caused by local craters or a possible overall concave shape.

The highly irregular shape of the town is an irregular concave polygonal figure.

When viewed from below it resembles the shallow concave shape of a saucer.

Despite being more than 400 km in diameter Proteus has a somewhat irregular shape with several slightly concave facets and relief as high as 20 km.

They are borne on the slightly thickened, muscular anterior end of the cylindrical body and they are roughly triangular in shape and markedly concave on their interior surfaces.

This method can be extended ( in theory ) to concave shapes where the centroid lies outside the shape, and to solids ( of uniform density ), but the positions of the plumb lines need to be recorded by means other than drawing.

A 1685 account describes it as being made of boulders simply heaped up on each other: " an immense mass of stone, of a shape of a demi-lune, with a bar in the middle of the concave: no one stone that lies there was ever touched with a tool or bedded in any sort of cement, but all the pebbles of the see are piled up, and held by their bearings only, and the surge plays in and out through the interstices of the stone in a wonderful manner.

* Gregorian-Similar to the Cassegrain design except that the secondary reflector is concave, ( ellipsoidal ) in shape.

This greater separation is necessary because the stick becomes longer and straighter, approaching a concave shape.

The " bowl " refers to the shape of the concave hillside the amphitheater is carved into.

The wiktionary: Concave | concave copper shape on top is an explosively formed penetrator.

The furnace makes use of the fact, which was known already to Newton, that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid, identical to the shape of a reflecting telescope's primary focusing mirror.

About 100 metres of 3. 6m-high loose palisading had been hastily erected in a concave shape, blocking the path to the pā, while other defensive works included a long trench 2m wide and 2m deep behind the palisade, as well as hidden rifle pits and three taumaihi, 6m-high towers built of packed soil and ferns.

Medusae vary from bell-shaped to the shape of a thin disk, scarcely convex above and only slightly concave below.

The shape of a PPF is commonly drawn as concave from the origin to represent increasing opportunity cost with increased output of a good.

As the wave passes, one dives into the ' back ' of the wave and gives a quick kick ( with fins ) or single crawl-stroke, and then tucks the body into a ' dolphin shape ' by tucking the chin to the chest, hunching the shoulders, bringing the hands into the inner thighs or even pockets, stiffening the whole body, and creating a concave ' air bubble ' in the chest.

The surface of Proteus shows several flat or slightly concave facets measuring from 150 to 200 km in diameter.

The surface of the water becomes slightly concave, with the consequence that the potential energy of the water at the greater radius is increased by the work done against gravity to achieve the greater height.

After a while, as the bucket continues to spin, the surface of the water becomes concave.

If the bucket's spinning is stopped then the surface of the water remains concave as it continues to spin.

The concave surface is therefore apparently not the result of relative motion between the bucket and the water.

For instance, a double concave in the middle and a single concave in the tip and tail keep the wakeboard riding higher in the water overall.

By capillary action, the water forms concave menisci inside the pores.

When the lower end of a vertical glass tube is placed in a liquid such as water, a concave meniscus forms.

In the olden days, when the idli mold cooking plates were not popular or widely available, the thick idli batter was poured on a cloth tightly tied on the mouth of a concave deep cooking pan or tava half filled with water.

A visitor may walk behind the water through the rusticated arcade of the concave nymphaeum, which is peopled by marble nymphas by Giambattista della Porta.

As the water begins to spin in the bucket, the surface of the water will become concave.

If the bucket is stopped, the water will continue to spin, and while the spin continues the surface will remain concave.

The concave surface is apparently not the result of the interaction of the bucket and the water, since the water is flat when the bucket first starts to spin, becomes concave as the water starts to spin, and remains concave as the bucket stops.

In most cases the surface is concave towards the system.

If rotation is arrested, the energy stored in fashioning the concave surface must be dissipated, for example through friction, before an equilibrium flat surface is restored.

Thus the " correct " way to view Figure 8 is to imagine the x-axis as pointing towards the observer and thus seeing a concave corner.

Also, the African elephant is typically larger than the Asian elephant and has a concave back.

Parabolic mirrors were also described by the physicist Ibn Sahl in the 10th century, and Ibn al-Haytham discussed concave and convex mirrors in both cylindrical and spherical geometries, carried out a number of experiments with mirrors, and solved the problem of finding the point on a convex mirror at which a ray coming from one point is reflected to another point.

They generally have one long axis and concave or convex edges, and it is possible for them to have a gibbosity ( hump ) or indentations.

The focal length f is considered negative for concave lenses.

As the arrangement is dragged forward, the sharp edge of the disc cuts the soil, and the concave surface of the rotating disc lifts and throws the soil to the side.

A peculiarity of Pellucidar's geography is that due to the concave curvature of its surface there is no horizon ; the further distant something is, the higher it appears to be, until it is finally lost in the atmospheric haze.

A concave tip well is said to help prevent bridging of closely spaced leads ; different shapes are recommended to correct bridging that has occurred.

The stick's curvature is generally convex as were violin bows of the period, rather than concave like a modern violin bow.

**** Explosively formed penetrator: Instead of turning a thin metal liner into a focused jet, the detonation wave is directed against a concave metal plate at the front of the warhead, propelling it at high velocity while simultaneously deforming it into a projectile.

; On-shore boards: A type of board that has four inline wheels and four in the back ( two on each side ) and is deeply concave in the front.

In telecommunications and radar, a Cassegrain antenna is a parabolic antenna in which the feed radiator is mounted at or behind the surface of the concave main parabolic reflector dish and is aimed at a smaller convex secondary reflector suspended in front of the primary reflector.