The editor has put together a nice selection of recent papers about possible advances in the development and extension of the Internet. A major emphasis is on the mobile Internet, and how the Internet might be more accessible to those with cellphones. Possible extensions to the TCP/IP stack, especially for wireless access, are mooted.
Sadly, one chapter is marred by an elementary physics mistake. It discusses satellite communications, and has a Figure 7.1 showing a satellite orbiting the Earth. A centripetal force is shown, and so too is a centrifugal force. The accompanying text says correctly that the centripetal force is due to the Earth's gravity. But then it goes on to assert that the centrifugal force is "due to the circular (more specifically elliptical) motion". Wrong. In an inertial reference frame, there is no centrifugal force on the satellite. There is only one net force acting on it, the centripetal force. The satellite is not in equilibrium, so it is not moving in a straight line. This is one of Newton's laws. The very fact that it is moving in an ellipse means that it is acted upon by a net force.
Another way of looking at it is to consider that if the centrifugal force exists, what object is causing this? From this standpoint, you can see that the above quote about the centrifugal force is rubbish.
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![“Internet Networks: Wired, Wireless, and Optical Technologies (Devices, Circuits, and Systems) (English Edition)”，作者：[Krzysztof Iniewski]](https://images-cn.ssl-images-amazon.cn/images/I/51Et0arcmAL._SY346_.jpg)
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