Monday 21 January 2013

What is the ratio of the net power emitted by object 1 to that radiated by object 2?

Two identcial objects are placed in a room at 21 degrees. Object 1 has a temperature of 98 degrees, and object 2 has a temperature of 23 degrees.

What is a VPN?


VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).

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