Where was the first windmill located? Detailed answer

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Where was the first windmill located? Detailed answer

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Where was the first windmill located?

Most likely in Persia 1300 years ago. From the Middle Ages to the introduction of machines, they ground flour all over Europe, from Spain to Scandinavia.

Author: Mendeleev V.A.

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How much does the weight of a body at the Earth's equator differ from the weight of the same body at the poles?

The weight of any physical body depends on the geographical latitude at which it is located. This is due to the combined action of two factors: the non-sphericity (oblateness at the poles) of our planet and its daily rotation.

With an increase in geographical latitude, the main component of weight (gravitational attraction, determined by the distance between the centers of mass of the Earth and the weighed body) increases, and the centrifugal effect, leading to weight loss, decreases.

Thus, any body has a minimum weight at the equator, a maximum - at the North Pole (a hill extends at the South Pole, and gravity weakens with distance from the center of the Earth). The difference between the indicated minimum and maximum body weights is approximately 0,5 percent. A product weighing a ton at the equator would add 5 kilograms in weight if it were delivered to the North Pole.

When carrying things to the Pole from other latitudes, the weight gain is less, but for large loads it can still be expressed in impressive numbers. Thus, the cargo of a sea vessel weighing 20 thousand tons in the middle latitudes would add 50 tons in weight if this vessel reached the North Pole. The cargo of an aircraft weighing 24 tons in Moscow would become 50 kilograms heavier after landing at the North Pole.

You can only detect such "increases" with the help of spring balances, because on the scales of lever weights, too, they become correspondingly heavier.

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"The transplant was a success: the new liver began to function immediately and the patient made a full recovery without complications," said Dr. Adil Khan, who led the surgical team from the University of Washington School of Medicine at Barnes-Jewish Hospital.

The recipient felt comfortable and regained mobility within a month after the operation, expressing a desire to return to golf and swimming. It usually takes about six weeks to recover from such an operation.

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