V. Translate the sentences paying attention to the verbs in Subjunctive Mood:

A. 1. It is necessary that the aircraft engine should combine efficiency and lightness.

2. It is highly desirable that physicists should solve the problem of control of dangerous radiations before we can widely use atomic energy.

3. It is essential in the application of the turbojet engine to the propulsion of missiles that the thrust per unit of frontal area be as large as possible.

4. It is important that the propellant remain liquid at the lowest temperature.

5. It is necessary that an aircraft engine function properly at a wide range of speeds, atmospheric conditions and altitudes.

6. To maintain an aircraft hydraulic system in good order it is essential that a means of operation on the ground be provided.

7. It is highly desirable that a person operating an aircraft have a good knowledge of the functions of engine controls and instruments.

B. 1. It is required that all research instruments be light and compact.

2. Much of to-day's scientific research requires the solving of difficult mathematical problems, some of which would require year to solve by the usual methods.

3. We wish Tsiolkovsky's ideas were put into practice.

4. The demand is that all measurements should be made very accurately.

5. The fundamental principle of generator action requires that lines of force be cut by wires.

6. He suggested that the experiment with liquid fuel rockets should be continued.

C. 1. If there were no friction we could not even walk.

2. The Earth behaves as if it were a large magnet

3. Our understanding of the nature of airflow would be much easier if the flow could be seen.

4. If there were no frictional losses in a machine, we could get as much work out of it as we put into it.

5. It would be much easier to compute satellite orbits if the Earth were perfectly spherical and had no atmosphere.

6. If one burnt 1 Ib of fuel and all the heat produced were used in heating water, it would be possible to increase the temperature of about 8 ¹/₂ tons of water by 1° Fahrenheit.

7. If the Earth's axis were perpendicular to the plane of its orbit, all parts of the world would have about 12 hours of daylight and 12 hours of darkness every day of the year.

8. If one could gather all the parts of an exploding atom, their total weight would be slightly less than the weight of the original atom.

9. In many cases air way be treated as if it were an ideal fluid.

VI. Translate the sentences using one of the ways given in the example:

Example:

The rocket would leave the Earth...

Ракета відірвалася б від Землі...

Ракета, можливо, відірветься від Землі...

1. Without the force of gravitation there would be no pressure in liquids.

2. The Sun radiates as much energy every second as would be released by the explosion of several billion atomic bombs.

3. A body leaving the Earth in the direction of the Moon would experience the gravitational field of both planets.

4. By reduction in jet velocity it would appear to be possible to increase the propulsive efficiency for a given rocket.

5. Uranium is a very rich power-producer: the atomic power plant uses 30 grams of uranium in 24 hours where a thermal power plant of the same capacity of 5,000 kwh would require as much as 100 tons of coal.

6. The problem of maintaining a store of liquid hydrogen in an orbiting satellite would appear to be relatively simple.

7. The transfer of liquid hydrogen from the earth's surface to orbit would be rather more difficult.