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hi, answer this one-
who is the ministry official killed in St. Mungo's by the use of devil's snare?
And i think RAB can be Regulus A. Black. I know he is supposed to be dead but even wormtail was. Tom's maternal uncle's name is Morfin
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Aapki kavita to zaroor ek nagma hai
Aaapko kaamyabi mile yahi hamari raza hai!!
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Hi!!
If a tangent is a line which touches a curve at one and only one point, then is the principle axis of a parabola its tangent? i know it does not satisfy the equation but then aren't we getting a contradiction?
Thanks!!!!!!
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Hi guys!!
I sure have logged on after a long time, and I find a huge craving to send Qs and As
to fellow goiitians and gain some points. I'm back and I'm full of questions. Here's one-
 A body is performing UCM(a weight is tied to a string and it performs UCM) parallel to horizontal plane.Hence the centripetal, tension forces will act at horizontal direction with no component at vertical.
Now mg of body acts downwards. The body is in equilibrium to the y axis. then which is the equal and opposite force to mg that causes equilibrium?
remember, string is rotating with angle to the horizontal 00.
Thankyou!!!!!!!!!!
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Hi!!
Speed of X rays and neutrinos is greater than that of light as their rest mass is nearly 0. therefore the mvelocity is always 0. But that will be of not much use for man as massless particles don't have energy.
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Hi,
I logged on after a long time! All your answers were correct, but i have some more information on the sum- If the density of the body thrown inside fluid(here water) is more(ie it sinks) then level of water decreases.but if the density of the body is less than that of the fluid then the level of water remains same.
ThanX!!!
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Hi!!,
There is a boat in a lake in which there is a man and a brick. The man throws the brick in the water. What is the change in the level of water?
Thankyou!!
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Hi!!
What is the value of -
d/dx sinx/x for x=0
If we take a graphical approach-
Slope of the tangent of the graph of sinx/x at 0 is 0, so the derivative at o should be 0 but by solving by u/v answer is an indeterminate form. please tell me where I am going wrong.
Thankyou !!
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Hi!
Mercury is very sensitive to temperature changes. Then does the level of mercury in the barometer change due to change in temperature. Won't we get wrong readings?
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Hi!
Even though some volume of the pond has decreased, Mass of the man has increased, Thus buoyancy also increased and water level is restored. Thus water level does not change. False
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Guys, do you think that surface tension or viscosity of water can cause scratches on glass?
When we wet the glass tumbler and the plate, the dust particles, oxides, grease, dirt ........ in short whatever that is not glass molecules is removed and there is direct contact between glass and glass. Then a force called cohesive force acts on the surfaces- How are the atoms of the tumbler going to know which of the neighboring atoms are of the tumbler and which of them of the plate? Thus they attract all atoms of glass in their vicinity with the same force, thus binding the plate. Our method of cleaning the surfaces was very primitive, but lab testing shows that the substances are welded together as if they are one peice. This is a beautiful paradox- To bind substances together we apply other adhesive materials in between the surfaces, but real binding is obtained not by adding things between the surfaces but removing all materials between the surfaces making them true. I got this explanation from Feynman's physics.
Even so, thanks for your interest.
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Hi!!
Mercury is less dense at high temperature and more dense at low temperatures.
If I take a mercury barometer from a tightly sealed refrigerator to a hot summer surrounding, I observe that there is no change in the mercury level.Why?
Thankyou
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Hi!!!
Please can you get me Problems in general physics by I.E.Irodov?
Thanks for the great work.
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Hi!!,
If I have to measure the temperature of a hot cup of tea, I insert a thermometer in it. Initial temperature of the thermometer bulb is 00C. When it is in contact with the tea, essentially the temperature of the bulb will increase and of the tea will decrease to attain thermal equilibrium. This means that thermometer heats up a little and tea cools down a little. When they attain a thermal equilibrium, thermometer measures its own temperature(which is equal to the tea's temperature). The problem here is- to attain equilibrium, the tea has cooled down a little, so what we measure is not the actual temperature of the tea but the temperature when the tea is a little cooled off.
If my line of reasoning is correct, then it means we all measure wrong temperature.
Any views over this? (Consider an isolated system)
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Hi!!
First of all, happy new year. Now to business- any body with velocity equal to the velocity of light has infinite mass-
mv = m0/  1-v2/c2
then, what is the mass of light itself?
I read somewhere that rest mass of light- m0 itself is 0, making mv also 0- no change.
But if this is true, then velocity of the photon can be increased or decreased as the mv will always be 0. Then why is there the barrier of 299792458 m/s?
If we say that m0 of light is 0, then how do we explain the photoelectric effect in which photons push electrons and eject them?
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Hi,
Please explain the funda of pseudo forces and how to deal with them in the sums.
Thank you!!!
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Diamonds are made in highest pressure, so are the champs-
Thats what you say at the end of every mail you send. The only simple thing you have to do is implement it. IIT is a game of toughness. You have to keep your cool in the baddest situations. What I suggest is increase your time of study- WITH FULL CONCENTRATION. Many books talk about mental stress and taking a break for a few minutes while studying. What I don't understand is that how can one try to attempt a 3+3 hours paper without even a minute lapse of concentration by allowing the mind to relax after small time intervals?
I have always felt that goiit is a great place to visit when your morale is low. By thinking about the problems of others you find solutions to your own. The key is to integrate problems and not differentiate them(as we all usually do) and you will be tension free. Good luck, and remember what Lance Armstrong used to say-
Be brave! fight like hell !!
ALL THE BEST!!!
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Sir,
I am from Maharashtra and faced the same problem in my lower classes. i think you should let your son appear in exams like NTS, MTS(Maharashtra Talent Search), NSTSE, Abacus Vision, NSO, etc. because study for such competitive exams sharpens one's mind, takes you deeper into the subjects and most important, makes one comfortable in solving multiple choice questions, which are the base for most of the future exams. BT has a n IIT preparation course for 9th and 10th. Most important- Let your son enjoy science and know its subtleness which will always remain with him.
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Hi,
Velocity of sound will be higher in humid air because humidity decreases the density of air. By the relation-
v =  P/
Density() decreases and v increases
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Please can anyone explain what is dry water and what is wet water?
thankyou
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