Задание 3. (10 баллов). 2. Atmospheric pressure - the pressure of the atmosphere to all her subjects and the earth's surface

3.1 … principle says about buoyant force. A) Archimedes’ B) Doppler C) Bernoulli’s D) Pascal’s E) Hooke’s

3.2 The vector sum of any number of vectors is called the … vector. A) Resultant B) Vector C) Scalar D) Scalar Product E) Vector Product

1.

2. Atmospheric pressure - the pressure of the atmosphere to all her subjects and the earth's surface. Atmospheric pressure balances the weight of overlying layers of air. Is measured by a barometer. Atmospheric pressure equal to the pressure of a column of mercury of height 760 mm at 0 °C is called normal atmospheric pressure (101 325 PA).

3. Potential energy is called energy, which is determined by the mutual position of the interacting bodies or parts of the same body. Potential energy, for example, has a body raised above the Ground, because the energy of a body depends on its relative position and the Earth and their mutual attraction. The potential energy of a body lying on the Ground, is equal to zero. E_п = A, E_п=Fh, E_п= gmh, potential energy; g - acceleration of gravity, equal to 9.8 N/kg; m is the mass of the body, h is the height at which the raised body.

Kinetic energy is called the energy possessed by a body due to its motion. The kinetic energy of a body depends on its velocity and mass. For example, the larger the rate of fall of water in the river and the greater the mass of the water, the stronger will rotate turbine power plants. E_k= mv^2/2 kinetic energy; m is the mass of the body; v - speed of movement of the body.

4. Radioactivity is the ability of atomic nuclei spontaneously disintegrate with the emission of particles. Radioactive decay of a nucleus is possible when it is energetically favorable, i.e., releases energy. This is the excess of the initial mass M of the nucleus of the sum of the masses mi of the decay products, which corresponds to the inequality M > ∑mi. The main types of radioactive decay are: α-decay is the emission of the atomic nucleus of α-particle; β-decay is the emission of the atomic nucleus, an electron and anti-neutrino, a positron and a neutrino absorption by the core of an atomic electron with the emission of neutrinos; γ-decay is the emission of the atomic nucleus γ-quanta; spontaneous fission decay of an atomic nucleus into two fragments of comparable mass.

HALF-life, the period of time during which splits half this number of nuclei of a radioactive isotope (which are transformed into another element or isotope). Is measured only half-life, since the total collapse occurs.

5. Архимед.

6. Результирующий вектор

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