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What could we use instead if these computers was not available?
Fingers and toes, an abacus, a slide rule, numerical charts, the phone, mail for sending videotapes back and forth.
Describe how the front buffer and back buffer work together in double buffering?
The front buffer is the image that is currently being displayed on the screen. The back buffer is the image that is being drawn to by a program. These switch back and forth, (moreover the information is transferred from the back to the front buffer), which lets the program draw exclusively to back buffer, where it will not be slowed down by the screen's refresh rate, as it would be if every element were drawn directly to the screen.
Is receiprocating pump advantageous or centrifugal pupm?
A reciprocating pump is an advantageous pump. Centrifugal pumps convert energy into rotation to power themselves. A reciprocating pump uses a back and forth linear motion.
What does a toggle switch do?
Toggle = back and forth, or on and off. A toggle switch toggles (turns) a light or other device on or off. Good example is a light switch (the wall kind)-- a toggle switch must also be of the "throw the stick back and forth" kind. Which a light switch basically is.
Why does your speakers vibrate when it is to loud?
Because you have them too loud. It will ruin your speakers if you keep it up. Actually, they always vibrate - it is the conversion of electrical signals to sound waves that causes the cone of a speaker to move back and forth rapidly, creating the sound wave that we hear. If the vibrate is more of a 'buzz', then the speakers are being pushed beyond their capacity, and will fail, as the original poster noted. Sound IS vibration. The sound waves hit your ear, and they cause your ear muscles to vibrate back and forth, and small organs convert this physical movement back into electrical energy which your brain then recognizes as sound. Sound can not travel in a vaccuum, it needs air or another medium to travel through.
