Papelitos de ayuda

1.PLASTIC MATERIALS: In general, plastic materials are a normal part of everyday life. They also play important roles in sectors such packaging, telecommunications, transport, construction, medicine, agriculture and information technology. Plastics consist of long chains of molecules, mostly made of the element “carbon”. These chains of macromolecules are called polymers, which is another name for plastics. Polymers are composed of smaller molecules called monomers. 1.1 THE ORIGIN OF PLASTICS:

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Exam Cheat Sheet
Stack & heap:
C programs use the stack for local variables, function parameters and return addresses.
C programs use the heap for explicitly requested dynamically allocated data (with malloc). 
In general, data is put on the stack unless we use malloc then its on heap
Malloc & Free:
Used in C as type of manual memory management
Always free malloc! Else lose point
Modern Languages like Java, Erlang etc. use Automatic Memory Management. The system allocates data structures
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1.Know why shadow copies are used in routers.

A shadow copy is stored because, the forwarding decision is made locally, at each input port,without invoking the centralized routing processor. Also decentralized forwardingavoids creating a forwarding processing bottleneck at a single point within therouter

2.Know the three types of switching fabrics.

Switching via memory: Fabric switching with the use of CPU

Switching via a bus: Fabric switching via shared buses on input and output port

Switching via interconnection

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Linux Disk Partition

In Linux, there are a few different partitioning command line tools we can use. One that supports both MBR and GPT partitioning is the parted tool. Parted can be used in two modes. The first is interactive, meaning we’re launched into a separate program, like when we use the less command. The second is command line, meaning you just run commands while still in your shell. We’re going to be using the interactive mode for most of this lesson. Before we do that let’s run a command to show what disks Read More

Review retrieval 3 º ESO

Types of levers: First grade: R, PA, F. Second grade: PA, R, F. Third grade: PA, F, R. Worm, use transmitting rotary motion between two shafts that form an angle of 90 degrees (always input and output gear). Description: Has a single tooth-shaped wire thread. The gear is a toothed wheel. Each time a turn just a cog goes with it. Features: The relations of transmission of motion through right angles, high cost and mov. without noise. pinion-rack system: This is a straight-tooth pinion, a rack engarnazado. Read More


MOTHERBOARD : known as the mainboard, system board etc is the main printed circuit board found in computers and other systems. It holds and allows communication between many of the crucial electronic components of a system, such as the central processing unit and memory, and provides connectors for other peripherals.
MICROPROCESSOR: is a computer processor that incorporates the functions of a computer’s central processing unit  on a single integrated circuit, The microprocessor is a multipurpose,
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