## Does gravity travel instantaneously?

Does gravity travels instantaneously? Or it travels equal to the speed of light. Answer: No clear answer now. If we believe in the Theory of relativity, Gravity (Gravitational Waves travel with the same speed as that of light in vacuum. If gravitons are like photons, then it makes sense too. However I invite you to think…… Continue reading Does gravity travel instantaneously?

## Motion in a vertical circle and conservation of energy

A stone  tied to a string of length l is whirled around a vertical circle with the other end of the string at the centre. At a certain instant of time the stone is at the lowest position and has a speed u. What is the magnitude of change in its velocity as it reaches…… Continue reading Motion in a vertical circle and conservation of energy

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## Addition of vectors – can you add 3 unit vectors to get a unit vector ?

“Can you add 3 unit vectors to get a unit vector ? discuss in terms of velocity, force etc” -Sindhuja posted The answer is yes. Please find a detailed description on addition of vectors with examples and exercises at the following links. http://www.physchem.co.za/Vectors/Addition.htm http://www.physchem.co.za/Vectors/Physical%20Examples.htm http://www.physicsclassroom.com/class/vectors/u3l1b.cfm http://www.walter-fendt.de/ph14e/resultant.htm http://canu.ucalgary.ca/map/content/vectors/addition/explain/tiptail/ http://www.physicsclassroom.com/morehelp/vectaddn/practice.cfm

## When several transparent materials are kept above each other, the resultant behaves like an opaque object.Why?What’s the Optics behind it?

When light falls on a object, three things happen – A part of the light is absorbed Another part is reflected ad The remaining part is transmitted. A transparent medium transmits most of the light incident on it. However, it absorbs a small part as well as reflect a small part. Therefore, when a number…… Continue reading When several transparent materials are kept above each other, the resultant behaves like an opaque object.Why?What’s the Optics behind it?