Asked Priyanka ]]>

Subject: physics

Message Body:

a boat is floating on the surface of water in a tank carrying steel balls.if the balls are thrown into the tank one by one ,how will it affect the level?

Asked Kunal

]]>s=s(0)+ut+1/2gt^2

here s is the displacement from mean position the why in the equation

Θ=θ(0)+ωt+1/2αt^2

θ represents angular distance not angular displacement…

Asked Nikhil Murarka

]]>The theory is deceptively simple. First, there is no “absolute” frame of reference. Every time you measure an object’s velocity, or its momentum, or how it experiences time, it’s always in relation to something else. Second, the speed of light is the same no matter who measures it or how fast the person measuring it is going. Third, nothing can go faster than light.

**The Problem**

The mass that determined the strength of the gravitational force was the same mass that appeared in Newton’s second law of motion, F = ma; gravitational mass was the same as the “inertial mass.” There was no apparent reason this had to be true, it simply was.

Einstein didn’t think this was mere coincidence. He insisted that the two types of mass are identical because of a fundamental symmetry in nature; that the laws of physics must take the same form whether one is in a gravitational field or in a region of space with no gravity (say, in a spaceship undergoing an equivalent acceleration). Carrying this principle to its logical conclusions eventually led to the equations of general relativity, the theory considered by many to be “probably the most beautiful of all existing physical theories.”

General relativity, also known as the general theory of relativity, is the geometric theory of gravitation published by Albert Einstein in 1915. General relativity generalizes special relativity and Newton’s law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime. In particular, the curvature of spacetime is directly related to the energy and momentum of whatever matter and radiation are present.

Some predictions of general relativity differ significantly from those of classical physics, especially concerning the passage of time, the geometry of space, the motion of bodies in free fall, and the propagation of light. The predictions of general relativity have been confirmed in all observations and experiments to date. Although general relativity is not the only relativistic theory of gravity, it is the simplest theory that is consistent with experimental data.

**The Unanswered Questions**

How general relativity can be reconciled with the laws of quantum physics to produce a complete and self-consistent theory of quantum gravity?

The problem of quantum gravity and the question of the reality of spacetime singularities remain open. Observational data that is taken as evidence for dark energy and dark matter could indicate the need for new physics. Even taken as is, general relativity is rich with possibilities for further exploration. Mathematical relativists seek to understand the nature of singularities and the fundamental properties of Einstein’s equations,and increasingly powerful computer simulations (such as those describing merging black holes) are run.

So, in a nutshell, **Einstein’s Theory of Relativity is not complete**. More needs to be added, more explanations to be given and more observations to be endorsed.

Ref: http://www.gallup.unm.edu/~smarandache/UnsolvedProblemsRelativity.pdf

]]>a)-Q/2

b)-Q/4

c) Q/2

d) Q/4

Asked Fayas Babu K

The answer is (b) **– Q / 4**

For the three charges to be in equilibrium, the net force must be zero. i.e, considering the net force on any one of Q (since q will be in equilibrium for any value of q when placed at the midpoint)

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CBSE Exam Results

Class XII Exam Results 2015

To be announced on May 25, 2015 at 12:00 Hrs.

CBSE Exam Results

Class X Exam Results 2015

To be announced on May 27, 2015 at 12:00 Hrs.

However, some regions, for example, TRIVANDRUM Region may declare the result early.

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Some media erroneously announced that CBSE will declare the results on 20 May though CBSE had not made any official declaration in this regard.

The students are advised not to be panic and let CBSE take its own time to declare an error free result.

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Students of class X are eagerly waiting for the results as the other boards have already declared the results.

**Expect the results by 23 May 2015. **

You can get the result from the following sites.

http://results.gov.in/index.aspx

http://cbseresults.nic.in/

Keep checking the above sites to know the results as and when they are announced

**Use the following link to calculate your cgpa if you know your grades.**