Recent content by donaldparida

@Stephen Tashi , I read about it here: http://math.feld.cvut.cz/mt/txtd/3/txe3da3b.htm.

I have seen two approaches to the method of integration by substitution (in two different books). On searching the internet i came to know that Approach I is known as the method of integration by direct substitution whereas Approach II is known as the method of integration by indirect...

@jim mcnamara, Nope this is not homework. I was just trying to figure out the steps to draw resonance structures of any compound, that is, the rules for "delocalising" the electrons.

@DrDu, but the electrons are delocalised (due to which they can move). Aren't they? If these rules are wrong then how does one draw the resonance structures of a compound?

@mjc123 why does this happen?

@mjc123 , could you please explain this line in your post: "whose pi electrons can move somewhere else to allow the new pi bond to be formed"

In my chemistry study material a set of rules to draw resonance structures are given. They are: (1) Only electrons move. The nuclei of the atoms never move. (2) The only electrons that can move are pi electrons (electrons in pi bonds) and lone-pair electrons. (3) The total number of electrons...

The direction of \vec{U}?

@haruspex, Why?

@haruspex, here it is:

@haruspex, Here is the diagram i drew while solving this problem,

1. Homework Statement : A person aims a gun at a bird from a point at a horizontal distance of 100m. If the gun can impart a speed of 500m/s to the bullet , then above what height of the bird he should aim his gun to hit it ? 2. Homework Equations : H_{max}=\frac{u^2\sin^2\theta}{2g}...

I am getting cos(θ)=3/[sqrt{5(5+5t^2−8t)}]. I am not posting my attempt because it is very lengthy and on top of that i do not know how to type them properly.

I cannot understand how to proceed. Could you please help.

Not working. I am getting some weird expression.