Physical Science for ProgressPrentice-Hall, 1970 - 626 σελίδες |
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Σελίδα 265
... waves are not exactly like water waves or waves that travel along a rope that is shaken . When a stone is dropped in the water , waves move out in circles . The circles start where the stone struck the water and get bigger as they move away ...
... waves are not exactly like water waves or waves that travel along a rope that is shaken . When a stone is dropped in the water , waves move out in circles . The circles start where the stone struck the water and get bigger as they move away ...
Σελίδα 270
... waves stay in front of the aircraft at all times . As a result of the sound waves moving ahead , the air moves around the aircraft in smooth streamlines . When an airplane crosses the sound barrier , it has caught up with the sounds it ...
... waves stay in front of the aircraft at all times . As a result of the sound waves moving ahead , the air moves around the aircraft in smooth streamlines . When an airplane crosses the sound barrier , it has caught up with the sounds it ...
Σελίδα 290
... waves into electrical impulses . be done to them : ( 1 ) they must be strength- ened , and ( 2 ) they must be combined with a high - frequency carrier wave . When waves are strengthened , we say they are amplified . The audio ...
... waves into electrical impulses . be done to them : ( 1 ) they must be strength- ened , and ( 2 ) they must be combined with a high - frequency carrier wave . When waves are strengthened , we say they are amplified . The audio ...
Περιεχόμενα
UNIT | 1 |
UNIT | 49 |
distributors of the John Frankenheimer film Grand Prix A General Electric Company 337 bottom rightGeneral Electric | 92 |
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acid acting ACTIVITY added amount atoms beam become body called carbon causes cell charges chemical chemical change circuit color combining compounds connected contains copper determined direction distance earth effort electrical electrical charges electrons elements energy engine equal experiment explain facts feet FIGURE flow force fuel gain gives glass grams happens heat hour hydrogen inch increases ions iron kinds lamp laser layer length light liquid magnet mass materials matter means measure metal miles mirror molecules moon motion move nature needed object oxygen particles piece plane plate pole position pounds pressure produced push rays reflected resistance Result rock scientists shell side sodium solution sound space speed spring stars Study surface temperature Terms theory travels tube turns units waves weight wire