II. Give Russian equivalents to the following noun-groups:

1. the radio transmitter parts; 7. the oscillations amplitude;

2. the oscillatory circuits operation; 8. the oscillations number;

3. the pendulum operation; 9. the free oscillations frequency

4. the pendulum oscillations; 10. the travel speed;

5. the pendulum movement; 11. the motion energy;

6. the pendulum maximum deflection; 12. the pendulum speed;

13. the hydrogen atom proton mass.

Ex. III. Choose the proper word to:

reception (передача, прием, преобразование);

complete (полный, продолжительный, короткий);

to deflect (отклонение, отклонять, отклоняющий);

oscillatory (колебание, колебательный, генератор колебаний);

measurement (измерять, измерительный, измерение).

Ex. IV. Make the following sentences negative and interrogative as in:

Model I.

He studies the operation of the pendulum.

He doesn't study the operation of the pendulum.

Does he study the operation of the pendulum?

Now do it yourself:

1. The potential energy becomes the kinetic one in this position.

2. The pendulum moves from position 1 to position 2.

Model II.

They analyse the properties of the pendulum oscillations.

They don't analyse the properties of the pendulum oscillations.

Do they analyse the properties of the pendulum oscillations?

Now do it yourself:

3. You understand the operation of this device.

4. They speak on the text «Free oscillations».

Model III.

You will analyse the damping process.

You will not (won't) analyse the damping process.

Will you analyse the damping process?

Now do it yourself:

5. These substances will have the following properties.

6. We shall find their application in radio transmitters.

Ex. V. Use the Present Indefinite Tense as in the Model:

We shall retell these texts.

We retell these texts.

Now do it yourself:

1. He will describe the operation of the pendulum.

2. I shan't translate these texts into Russian.

3. She won't ask questions on the text.

4. Will he analyse the pendulum speed?

5. Shall we use the properties of the pendulum?

Ex. VI. Say if you agree or not to the following statements using correspondingly: you are right — верно; you are not quite right — неверно.

1. We measure the period in cycles.

2. Free oscillations are sinusoidal.

3. There are only two properties of free oscillations.

4. In position one or two the pendulum has the greatest potential energy.

5. In the zero position the kinetic energy is equal to zero.

Ex. VII. Translate into English:

1. Максимальное отклонение маятника от нулевого положения есть амплитуда колебаний.

2. Число колебаний в секунду есть частота.

3. Колебания маятника затухают в результате потери энергии.

4. Частота свободных колебаний маятника не зависит от его ам­плитуды.

5. В нулевом положении маятник имеет наибольшую кинетичес­кую энергию.

6. В нулевом положении потенциальная энергия равна нулю.