Which dog is the biggest and strongest? Detailed answer

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Which dog is the biggest and strongest? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

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Which dog is the biggest and strongest?

Dogs of the St. Bernard breed can weigh up to 125 kg. However, the strongest breed is the Newfoundland. Although its mass is "only" about 60 kg, it can drag up to half a ton of cargo on the ground.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What makes the earth revolve around the sun?

Let's start by determining what makes the Earth and other planets move. According to one of the theories about the origin of the solar system, about 5 billion years ago, a huge cloud of dust formed and began to rotate. It turned into a disk, and the hot central mass became the Sun. The outer parts of the dust cloud turned into separate swirling masses, from which the planets then formed.

And now the planets, one of which is the Earth, continue to rotate. And why the Earth and other planets do not fly away into open space? This is prevented by the gravity, or attraction, of the Sun. According to Newton's laws of motion, a moving object tries to continue its movement in a straight line until it is acted upon by extraneous forces. Therefore, moving planets tend to fly away from the Sun in a straight line. But external forces prevent this, keep the planets in their orbits. These external forces are solar gravity, that is, solar attraction.

Each planet moves in its own orbit and the speed of its movement depends on its distance from the Sun. The planet moves faster when it is closer to the Sun and slower when it moves away from it. The Earth moves at a speed of 30,2 km/s when it is closest to the Sun, and at a speed of 29,2 km/s when it is at its furthest from it. As the planet orbits closer to the Sun, the Sun's gravitational pull is stronger; when it moves away, the gravitational pull weakens. Greater gravity causes a greater speed of the planet. For example, Mercury moves at an average speed of 47,9 km/s, and Pluto at an average speed of 4,6 km/s.

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Random news from the Archive

A new value for the upper limit of the neutrino mass has been established 23.12.2019

An international team of researchers using a new highly sensitive spectrometer has found a new upper limit on the mass of elusive neutrino particles. Until recently, it was believed that neutrino particles do not have mass at all, but the results of some studies indicate the fallacy of such a judgment. And, of course, the next logical step should be to determine this mass, and this is done by gradually narrowing the range between the upper and lower limits of this value.

Scientists have long been able to find evidence that the mysterious neutrino particles exist in reality, their number, according to assumptions, is a billion times greater than the number of atoms in the universe. However, despite such an abundance of these particles, scientists have only made limited progress in studying their properties. And these properties must include a lot for our understanding of the physics of processes occurring at the smallest level.

Let us return to the measurement of the neutrino mass. There are currently three different methods for this. The first method uses the analysis of cosmic microwave background radiation, the second method is looking for very rare cases of neutrinoless double beta decay of certain elementary particles, and the third method is to try to directly measure the neutrino mass in exotic ways that do not rely on any of the existing theoretical models.

It is this third method of measuring the neutrino mass that was used by scientists working in the framework of the KATRIN (Karlsruhe Tritium Neutrino Experiment) experiment conducted by researchers from the Karlsruhe Institute of Technology in Germany. The key instrument of this experiment is a huge 200-ton electron spectrometer, which is used to study the decay of tritium, a radioactive isotope of hydrogen. When tritium decays, it creates a single electron and a neutrino at the same time. Knowing the initial energy of tritium and measuring the energy of this electron using a highly sensitive spectrometer makes it possible to calculate the neutrino mass with a sufficiently high accuracy, exceeding the accuracy of previous similar measurements.

The data collected during the experiment indicated that the value of the upper limit of the neutrino mass is 1.1 electron volts, which is approximately half of the value previously determined. And this, one might say, is a very small mass, which is 500 thousand times less than the mass of an electron, which also cannot be called a large and heavy particle.

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