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A direct current is a current flowing always in the same direction.
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Radiating from the earth, heat causes air currents to rise.
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A body can more uniformly and in a straight line,there being no cause to change that motion.
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Vibrating objects produce sound waves ,each vibration producing one sound wave.
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In communications, the problem of electronics is how to convey information from one place to another.
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Materials to be used for structural purposes are chosen so as to behave elastically in the environmental conditions.
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There are different ways of changing energy from one form into another.
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In making the radio waves correspond to each sound in turn, messages are carried from a broadcasting station to a receiving set.
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The forces due to friction are called frictional forces.
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A call for paper is now being issued .
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In this factory the only fuel available is coal.
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In radiation, thermal energy is transformed into radiant energy ,similar in nature to light.
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The air outside pressed the side in .
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The force upward equals the force downward so that the balloon stays at the level.
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The results obtained must be cheeked .
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The heat produced is equal to the electrical energy wasted.
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During construction, problems often arise which require design changes.
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The molecules exert forces upon each other, which depend upon the distance between them.
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Very wonderful changes in matter take place before our eyes every day to which we pay little attention.
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To make an atomic bomb we have to use uranium 235, in which all the atoms are available for fission.
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It is evident that a well lubricated bearing turns more easily than a dry one.
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It seems that these two branches of science are mutually dependent and interacting.
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It has been proved that induced voltage causes a current to flow in opposition to the force producing it.
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It was not until the 19th century that heat was considered as a form of energy.
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Computers may be classified as analog and digital.
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The switching time of the new-type transistor is shortened three times.
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Electromagnetic waves travel at the same speed as light.
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Microcomputers are very small in size ,as is shown in Fig.5.
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In water sound travels nearly five times as fast as in air.
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Compared with hydrogen, oxygen is nearly 16 times as heavy.
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Ice keeps the same temperature while melting.
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An object, once in motion, will keep on moving because of its inertia.
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All substances, whether gaseous, liquid or solid ,are made of atoms .
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