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CBSE Class 12-science Answered

HOW GPS WORKS? CAN YOU TELL WHAT IS IMPORTANT FROMTHE NEW TOPIC ADDED IN COMMUNICATION SYSTEM?
Asked by niharika | 23 Feb, 2015, 04:58: PM
answered-by-expert Expert Answer

Hi Nikki,

Global positioning system is a method of identifying location or position of any detail on earth using a system of 24 satellites, which are continuously orbiting, observing, monitoring and mapping the surface of the Earth. Each satellite revolves around earth twice a day at a distance of about 20000 km.

The entire new topic added in the chapter can be considered important because it is being introduced for the first time.

Answered by | 23 Feb, 2015, 05:07: PM

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CBSE 12-science - Physics
A dumbbell consists of two masses A and B each of mass m joined by a light rod of length l with mass B attached to a suspension point O by a light rod of length l as shown in figure. Find the minimum required speed with which mass A to be projected horizontally so that the system completes the vertical circular motion.
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