Ege in physics is an early wave.

1. The figure shows a graph of the dependence of the projection of the speed of the bodyV x from time. The graph of the time dependence of the projection of the acceleration of this bodya xin the time interval from 8 to 10 s coincides with the schedule

2. Two forces act on the body: and, According to the force and the resultant of the two forces = + find the modulus of the second force (see figure).

1) 5 H

2) (H

3) H

4) (H

3. The bar rests on an inclined plane making an angle of 30 ° with the horizon. The static friction force is 0.5 N. Determine the force of gravity acting on the body.

4. The body moves in a straight line in one direction. Under the action of a constant force directed along this straight line, in 3 s the body impulse increased from 5 kg m / s to 50 kg m / s. What is the modulus of force?

5. The figure shows the dependence of the amplitude of steady-state oscillations of the pendulum on the frequency of the driving force (resonance curve). The frequency of the driving force was initially equal to 0.5 Hz and then became equal to 1.0 Hz.

How many times did the amplitude of the steady-state forced oscillations of the pendulum change?

6. Ball thrown horizontally from a heightH with an initial speed, during the flightt horizontal flying distanceL (see figure). What will happen with the flight time and the acceleration of the ball if the height is increased at the same setting with a constant initial velocity of the ballH ? (Neglect air resistance.) For each value, determine the corresponding character of its change:

1) will increase 2) will decrease 3) will not change

Write down the numbers in the answer, arranging them in the order corresponding to the table:

Flight time

Ball acceleration

7. A body weighing 200 g moves along an axisOh , while its coordinate changes in time in accordance with the formulax( t) = 10 + 5 t – 3 t 2 (all quantities are in SI units). Establish a correspondence between physical quantities and formulas expressing their dependence on time under the conditions of a given problem.

PHYSICAL QUANTITIES

FORMULAS

A) kinetic energy of the body E K(t)

B) displacement of the body S (t)

1)

2)

3)

4)

8. Some vessel contains nitrogen and oxygen. Thermodynamic equilibrium of these gases will come only when these gases become the same

1) temperatures 2) partial pressures 3) particle concentrations 4) densities

9. 1 mole of an ideal gas passes from one state to another. Which figure shows a graph of isobaric gas cooling?

10. What work per cycle will the heat engine perform if it receives 800 kJ of heat from the heater, if its efficiency is 30%? Express your answer in kJ.

11. When investigating isoprocesses, a closed vessel of variable volume filled with air and connected to a manometer was used. The volume of the vessel is slowly increased, keeping the air pressure in it constant. How does the temperature of the air in the vessel and its density change?

For each value, determine the corresponding character of its change:

1) will increase;2) will decrease;3) will not change.

Air temperature in the vessel

Air density in the vessel

12. The figure shows a diagram of four successive changes in the state of a 2 mol ideal gas. In which process is the work of the gas positive and minimal in magnitude, and in which is the work of external forces positive and minimal in magnitude? Establish a correspondence between these processes and the process numbers in the diagram. For each position of the first column, select the corresponding position from the second column and write down the selected numbers in the table under the corresponding letters.

PROCESS

PROCESS NUMBER

A) the work of external forces is positive and minimal

B) gas work is positive and minimal

1) 1

2) 2

3) 3

4) 4

13. Four balls of the same mass, the charges of which are equal in absolute value, are suspended on silk threads. The charges of the two balls are shown in the figure. To explain the deflection of the balls shown in the figure, it is necessary to assume that

1) balls A and B carry a positive charge

2) the ball A carries a positive charge, and the ball B is negative

3) balls A and B carry a negative charge

4) ball A carries a negative charge, and ball B is positive

14. Point charges are placed at the three vertices of the square: -q , + q , − q ( q > 0) (see figure). Where is the Coulomb force directed, acting from the side of these charges on a point charge +2q located in the center of the square?

1) 2) 3) 4)

15. A direct current flows through a section of the circuit (see figure)I = 6 A. What is the current strength indicated by the ammeter? Disregard the resistance of the ammeter.

16. The angle of incidence of light on a horizontal flat mirror is 30 °. What will be the angleformed by the incident and reflected rays, if, without changing the position of the light source, turn the mirror by 10 ° as shown in the figure?

17. The α-particle moves in a circle in a uniform magnetic field between the poles of a magnet under the action of the Lorentz force. After replacing the magnet, protons with the same speed began to move along the same trajectories. How have the magnetic field induction and the Lorentz force modulus changed? For each value, determine the corresponding nature of the change: 1) increased 2) decreased 3) did not change

Magnetic field induction

Lorentz force modulus

18. An ideal oscillating circuit consists of a capacitor and a 4 mH coil. The charge on the capacitor plates changes with time in accordance with the formulaq( t) = 2*10 -4 (all quantities are in SI units). Establish a correspondence between physical quantities and formulas expressing their dependence on time under the conditions of a given problem. For each position of the first column, select the corresponding position from the second column and write down the selected numbers in the table under the corresponding letters.

PHYSICAL QUANTITIES

FORMULAS

A) current strengthi (t) in an oscillating circuit

B) energyW L (t) coil magnetic field

1)

2)

19. In the inertial frame of reference, light from a stationary source propagates in a vacuum with a speed of c. In this frame of reference, light from a stationary source falls perpendicular to the surface of the mirror, which approaches the source with speed. What is the speed of the reflected light in the inertial frame of reference associated with the source?

1) c + V 2) c – V 3) c4) c

20. In a sample containing a radioactive isotope of bismuth, reactions of its transformation into polonium occur simultaneously:- and thallium:... At the same time, the

1) only-radiation 2)-, - and-radiation 3)- and-radiation 4) only-radiation

21. Green light (λ = 550 nm) passes from air to glass with a refractive index of 1.5. Determine the ratio of the energy of a photon in air to its energy in glass.

22. Establish a correspondence between the graphs presented in the figures and the laws (dependencies) that they can express.

For each position of the first column, select the corresponding position from the second column and write down the selected numbers in the table under the corresponding letters.

23. In a school laboratory, the dependence of the voltage between the ends of a conductor on the strength of a direct current flowing through it was obtained (see figure). What is the approximate resistance of this conductor based on the results of the measurements?

1) 960 Ohm

2) 2.0 kΩ

3) 540 Ohm

4) 1.2 kΩ

24. From the origin of the Cartesian coordinate system at the moment in timet = 0 the body (material point) is thrown at an angle to the horizon. The table shows the results of measuring the coordinates of the bodyx andy depending on the observation time. Choose two correct statements based on the data in the table.

1) At a moment in timet = 0.4 s the speed of the body is 3 m / s.

2) Projection speedV y at the momentt = 0.2 s equals 2 m / s.

3) The body was thrown at a speed of 6 m / s. 4) The body was thrown at an angle of 45 °.

5) The body has risen to a maximum height of 1.2 m.

25. The load is suspended by a spring with a stiffness of 100 N / m from the elevator ceiling. The elevator descends uniformly downward to a distance of 5 m for 2 s. What is the mass of the load if the elongation of the spring with a steady motion of the load is 1.5 cm?

26. The figure shows the process taking place with 1 mole of helium. Minimum gas pressureR 1 = 100 kPa, minimum volumeV 1 = 10 l, and the maximumV 2 = 30 l. What work does helium do when going from state 1 to state 2? Express your answer in kJ.

27. The maximum kinetic energy of electrons emitted from a metal under the influence of light is 1.2 eV. If the wavelength of the incident light is reduced by a factor of 2, then the maximum kinetic energy of electrons emitted from the same metal becomes 3.95 eV. Determine the energy of the incident photons (in eV) in the first case.

28. Using the equipment shown in Fig. 1, the teacher assembled a model of a flat capacitor (Fig. 2), charged the bottom plate with a positive charge, and grounded the body of the electrometer. The upper plate of the capacitor connected to the body of the electrometer acquired a negative charge equal in magnitude to the charge of the lower plate. After that, the teacher shifted one plate relative to the other without changing the distance between them (Fig. 3). How did the electrometer readings change (increased, decreased, remained the same)? Explain the answer, indicating what phenomena and patterns you used to explain. The readings of the electrometer in this experiment are directly proportional to the potential difference between the plates of the capacitor.

29. Plasticine ball at the momentt = 0 thrown from the horizontal surface of the Earth with an initial velocityV 0 at an angle α to the horizon. Simultaneously, from a certain height above the surface of the Earth, another ball of the same kind begins to fall from a state of rest. The balls collide absolutely inelastically in the air. Immediately after the collision, the speed of the balls is directed horizontally. At what point in time τ will the balls fall to the Earth? Neglect air resistance.

30. In a horizontal cylinder with smooth walls under a massive piston with an areaS there is a monatomic ideal gas. The piston is connected to the cylinder base by a spring with a stiffnessk ... In the initial state, the distance between the piston and the base of the cylinder isL , and the gas pressure in the cylinder is equal to the external atmospheric pressurep 0 (see figure). What amount of warmthQ then transferred to the gas, if as a result the piston slowly moved to the right a distanceb ?

31. In the circuit shown in the figure, the resistance of the diode in the forward direction is negligible, and in the opposite direction it is many times higher than the resistance of the resistors. When connected to a pointA positive pole, and to the pointV the negative pole of the battery with an EMF of 12 V and a negligible internal resistance, the power consumption is 14.4 W. When the polarity of the battery connection was reversed, the power consumption turned out to be 21.6 W. Indicate how current flows through the diode and resistors in both cases, and determine the resistances of the resistors in this circuit.

32. The oscillatory circuit of the radio receiver is tuned to the wavelength λ = 2000 m. The inductance of the coil of the circuitL = 6 μH, the maximum current in itI max= 1.6 mA. The circuit uses a flat air condenser, the distance between the plates of which isd = 2 mm. What is the maximum value of the electric field strength in the capacitor during the oscillation process?

Every year in Russia there is a state certification of schoolchildren who graduate from graduation classes. The law provides for early and main delivery periods.

In 2016, the USE of the early period began at the end of March, and continues to this day. In early April, such exams as well as. Since these subjects are not compulsory, students have the right to choose them independently.

In recent years, the physical discipline has gained significant popularity, and many schoolchildren who want to enter physics and mathematics universities in the future apply to take this subject.

Students have several options for obtaining final information on the exam they passed, but you should be aware that results of the early USE in physics in 2016, will be available only at the end of the verification period.

There are several ways, but everything can be divided into two groups:

• with a personal appeal of the student to the organizers of the state certification;
• the ability to get a result according to passport data, by accessing electronic resources on the Internet.

Each option is free and quite affordable for any student.

When will the results of the early USE in physics be known?

As with chemistry, the physical discipline exam passed April 2... Previously, the data on the results of the test will be published on the portal of the Ministry of Education 13 april.

According to the decree of the department, examiners and organizers of state certification in order to check the finished work are given no more than 10 days... In some situations, the deadline may be extended up to 12 days, on the basis of a separate order.

Some sites speculate on the need for schoolchildren to find out the results of the USE, and offer them to get the results for a fee the next day, but such actions are deliberately fraudulent and you should not use such electronic resources.

All information is provided to children completely free of charge and strictly at the end of the period allotted for verification.

Where can you get the results?

About how and where can find out the results of the early exam in physics there is a lot of information. Details of such information can be obtained on the RSCI website. There are published lists of educational sites, where data on the results are posted immediately after verification and are accurate. In turn, on official website of FIPI you can find the telephone number of the "hot line" of a particular region and get the exact answer to this question there.

In general, there are several ways to find out the results:

1. The teenager must contact the management of the school that conducted the test, submit an application and receive an official certificate from the passport. In this document, the upper and lower score levels and the grade determined in accordance with the special rating are indicated. In the future, the school leadership places the information received on a special stand. The disadvantage of this method is that the student cannot get acquainted with the work itself, if necessary, challenge the decision and analyze the mistakes made.
2. The next way to get information about passing the state exam is to contact the official electronic resource of the Ministry of Education. There you can find out about the number of points scored, assessment and see a scanned copy of the work itself.

Duration of the physics exam - 3 hours 55 minutes
The work consists of two parts, including 31 tasks.
Part 1: tasks 1 - 23
Part 2: tasks 24 - 31.
In tasks 1-4, 8-10, 14, 15, 20, 24-26, the answer is
an integer or final decimal fraction.
The answer to tasks 5-7, 11, 12, 16-18, 21 and 23
is a sequence of two digits.
The answer to problem 13 is a word.
The answer to tasks 19 and 22 is two numbers.
The answer to tasks 27–31 includes
a detailed description of the entire progress of the task.
Minimum test score (on a 100-point scale) - 36

Demo version of the exam 2020 in physics (PDF):

Unified State Exam

The purpose of the demo version of the exam assignments is to enable any USE participant to get an idea of ​​the structure of the CMM, the number and form of assignments, and the level of their complexity.
The above criteria for assessing the performance of tasks with a detailed answer, included in this var-t, give an idea of ​​the requirements for the completeness and correctness of recording a detailed answer.
For successful preparation for passing the exam, I propose to analyze the solutions of prototypes of real tasks from the exam var-tov.