Will Internet be used in space?

It certainly looks like internet will soon be used in space too. In fact, a programme of the United States Department of Defence called Iris will put an internet router in space by the start of 2009. This programme will allow voice, video and data communications for US troops using standards developed for the internet. Eventually, Iris could extend the net into space too. Right now data from satellites orbiting in space is beamed to the ground first, and then beamed up again to another satellite. Iris will make it possible for data to flow directly between satellites orbiting in space through the internet in space.


How can we talk through our hands?

Wouldn’t it be incredible if your hand could become a mobile phone? Well, sometime in the future, it may. A technology is already being developed called Finger Whisper technology, which could turn hands into handsets. By converting voice into vibration, then conducting vibration through the bones in the user’s hand, the hand becomes a type of receiver

What is VO WiBro?

This is another difficult sounding term which can be explained only if you know what WiBro is.WiBro is a wireless broadband internet technology being developed by the Korean telecom industry. With WiBro, Korean phones will tap into on ‘always on’ broadband connections that have a bandwidth much greater and faster than what is available now. Vo WiBro will be a great improvement on VoIP and the quality of service will be far superior due to the increased bandwidth and speed.


Why does a steel ball pitch higher than a rubber ball?

It is a scientific fact that the height to which any object bounces depends on its elasticity. This physical property is defined as the ratio of stress (The force acing on a unit area of the ball during compaction) created on the object to the strain (change in size of the ball) which acts on it. It is independent of the density of the material.

For larger values of elasticity, the strain should be smaller for a given amount of stress. In the case of a steel ball and a rubber ball, though steel has higher than rubber, it has greater elasticity, as the strain produced in steel is much less than that in rubber, for constant stress. In the case of a bouncing steel ball and a rubber ball, even though steel has higher density          than rubber, it has greater elasticity, as the strain produced in steel is much less than that in rubber, for constant stress. In the case of a bouncing steel ball, collision is elastic in which both momentum and kinetic energy are almost conserved.



            That is, the energy loss is minimum. Hence the steel ball bounces to a greater height than the rubber ball.



 


How is information stored in audio and video tapes?

Information is stored in audio/video tapes by magnetizing them. These tapes are actually long, thin plastic films coated with a magnetic material, mainly iron oxide.

Likewise, the player has a recording head which consists of a coil of a wire wound around a circular piece of iron with a small gap. Any current passing through the wire would produce a magnetic field around it.



Information (voice or image or any data) to be stored is converted into electric signals (by a microphone) amplified and fed to the recorder head. As the current varies in accordance with the image or sound (input signals) to be recorded, it produces a varying magnetic field.



When the tape is run through the small gap present in the recording head, the varying magnetic field magnetizes the particles on the tape rearranged their moments in accordance with the variation in the input signal.



To reproduce the signal recorded, the tape is again run past the recording/playing head which   senses the magnetic field along the tape. This induces a varying current in the coil. This current is amplified and fed to the speaker or TV to reproduce the original message.