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School Spano (1), Castelvì (2) |
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Function To study the fall of the bodies. | |||
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Description (1) It is formed by a glass tube with two brass ring nuts and a tap with threading. Inside the tube we have: a feather, a piece of coloured paper, a wooden sphere and a steel sphere. In vacuum all these objects travel vertically the length of the tube in the same time. The length of the tube is one meter. | |||
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School Pellegrini |
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Function To show the inertia of bodies at rest. | |||
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Description A card and a sphere are placed on a little column. By freeing the spring placed in front, the card goes away but leaves the sphere on the top of the column. | |||
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School Spano |
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Function To study the parabolic motion for the fall of bodies. | |||
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Description The apparatus is made of wood with a plumb line. A ball falls along an oblique pipe and goes out horizontally with a certain speed. From this point it continues in free fall following a parabolic course. A grid helps to demonstrate the square proportionality between the vertical shift of the ball and the time. | |||
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School Castelvì (1), Spano (2) |
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Function To show that a liquid in a tube without air behaves as a compact mass. | |||
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Description A glass tube holds water without air. Reversing the tube suddenly we produce a sharp and loud noise. From a similar circumstance we obtain the noises that are heard in central heating radiators at the beginning and during the final phase of the start. | |||
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School Spano |
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Function To study the effects of the centrifugal force. | |||
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Description The apparatus that obliges a ball to travel along a loop placed on a vertical. | |||
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School Castelvì (1), Spano (2) |
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Function To stabilize the rotation speed of a thermal machine. |
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Description Totally metallic model with a very solid parallelogram, of which two sides hold two brass spheres with the same weight; the other sides drag a cylindrical slider that, controls the access valve of the steam to the cylinders when applied to thermal machines. | |||
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School Castelvì (1), Pellegrini (2), Spano (3) |
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Function This apparatus is normally called the flattening of the Earth. | |||
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Description The two rings, fixed to the rotation axe at the bottom assume the form of an ellipse as soon as they are placed in rotation. If we imagine the steel ring divided into parts of equal mass, the centrifugal force is greater for these masses that are farther from the rotation axe. | |||
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School Castelvì |
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Function To study the effect of the centrifugal force on liquids. | |||
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Description An escutcheon supports a glass globe. It can be applied to a rotating apparatus. We fill the globe with coloured water. When we reach a certain rotating speed, the water forms a crown leaving the central side empty. | |||
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School Spano(1), Pellegrini (2) |
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Function To show that the centrifugal force is directly proportional to the mass. | |||
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Description Two glass test tubes inclined and symmetrical with respect to the axe of rotation, hold water mercury and two balls of plumb and of cork oak. During the motion the different substances assume an inverse distribution from the normal one, because the centrifugal force is proportional to the density, when the volumes are equal. | |||
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School Spano |
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Function It is used to give an idea with the centrifuges used in the chemistry laboratory and in the industry. | |||
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Description We fill the two test tubes of water with clay. During the rotation the two test tubes dispose themselves on the horizontal plane and the clay deposits at the bottom and can be separated from the water. The two test tubes are protected by a metallic cage and can be removed for the cleaning. | |||
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School Pellegrini |
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Function To study the functioning of a centrifuge. | |||
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Description From the top end of a pole three small arms with three test-tubes branch off at 120° angles. We fill the test-tubes with water and earth and we make them rotate. They dispose themselves horizontally and the earth which is heavier goes to the bottom. | |||
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School Spano (1), Pellegrini (2) |
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Function It is used to show that the plane of oscillation of a pendulum keeps its position constant. | |||
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Description It is applied to the rotary apparatus, but to make the experiment it is only necessary to give a slow rotation to the base by hand, after making the pendulum oscillate. The oscillation plane keeps the original direction. | |||
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School Spano |
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Function It is used to explain the operation of the rotating pumps at centrifugal force. | |||
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Description The metallic case is supported by the vertical pole that is given together with the rotary apparatus. Once the case is set in place without its cover, we adapt the wheel which has a common cone, and we put the cover on. If we use the apparatus vertically and we place a lighted candle near the central hole of suction of the fan, we can observe that the flame is attracted towards the inside. | |||
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School Pellegrini |
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Function To study the central collisions. | |||
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Description It is formed by a set of pendulums hanging from a bar. They are made of elastic spheres of the same mass and of strings of the same length. The spheres are all in contact. The collision of the first sphere propagates through the others until the last. If one sphere is substituted to another made of inelastic material, the propagation of the collisions does not happen. | |||
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School Pellegrini |
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Function To study molecular actions. | |||
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Description Great drops of melted glass are dropped in cold water. Because of the instantaneous solidification of their surface, we have a very great and a very strong internal tension. The drops resist the shock but burst at the minimum superficial scratch or when we cut their top. | |||
