## Search found 57 matches

Wed Jan 16, 2013 4:39 pm
Forum: Physics
Topic: Change of temperature by adding water
Replies: 4
Views: 2741

### Re: Change of temperature by adding water

There is some oddity in the wording of the problem. 1. If the situation takes place in normal atmospheric pressure, we should consider the latent heat in calculation. But then the hot water should not be called ‘water’ because it must be steam at obviously more than 200 °C. Also, the linear heat tra...
Tue Jan 15, 2013 6:12 pm
Forum: Physics
Topic: Action-Reaction
Replies: 2
Views: 1768

### Re: Action-Reaction

Let the action-reaction forces between the objects be R each, and their acceleration be a. For the bigger block, 24 - R = 9a ... ... (1), since two forces are acting upon it. For the smaller block, R = 3a ... ... ... (2), since only R is acting on it Solving these, you get all you need. :) Note: you...
Tue Nov 27, 2012 6:25 pm
Forum: Physics
Topic: relativity
Replies: 4
Views: 3188

### Re: relativity

Why don't you please elaborate your solution in light of the theory? A line/object from (1, 2) and (5, 8) is not the same thing as two separate lines/objects as in vector addition. If you please enlighten us on your logic in details, then perhaps we would be able to see where the mistake, if any, ha...
Mon Nov 26, 2012 3:36 pm
Forum: Physics
Topic: relativity
Replies: 4
Views: 3188

### Re: relativity

To you, there will be no length contraction of the line segment. It will appear to you the same long as it appears to an observer in the segment’s own (rest) frame of reference. According to the special theory of relativity, length contraction happens ‘only’ in the direction of ‘relative motion. The...
Thu Nov 15, 2012 8:47 pm
Forum: Physics
Topic: prism
Replies: 7
Views: 3036

### Re: prism

Nicely explained by Adib! Just a few points added: The prism in fact divides the white color of sun ray into “infinitely many” colors (frequencies)—into lights of the entire Visible Spectrum. The so-called 7 colors are just seven colors dominantly perceived/felt by the eye and do not tell the whole/...
Fri Oct 19, 2012 6:11 pm
Forum: Chemistry
Topic: More preferable Fuel
Replies: 7
Views: 6902

### Re: More preferable Fuel

About the 94-98% of the natural gas in Bangladesh is methane. So, it is quite understood why we have methane supplied through the gas transmission lines. But the gas we use in households, called the liquefied petroleum gas (LPG), is mainly propane, butane, or a combination of them. But why propane o...
Wed Oct 10, 2012 2:43 pm
Forum: Physics
Topic: অসহ ওজন
Replies: 6
Views: 3479

### Re: অসহ ওজন

1. There is no such force as the Centrifugal Force! 2. The only force acting on the string is the “constant” tension force F (assuming the object revolves in a horizontal plane and imagining the weight force of the object is somehow balanced to keep it on the plane). In this situation, we generally ...