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How is -OH more activating than -OR in benzene ring although R increases electron density on Oxygen increasing its efficiency to increase electron density in ring? ...

Why do we study derivatives up to acceleration only ...

A body is on a wedge(Traingular ABC), which is right angled at B and B touches the ground. Body is at point A A body can move from A to C by two different pathes: - Sliding along the inclined plane AC (lenght l) without frict ...

Can pi be teh root of a polynomial with integer coefficients?? Why why not? ...

A thin spherical shell having uniform density is cut in two parts by a plane and kept separated. The point A is the center of the plane section of the first partand B of the second part. Show that the gravitational field at A ...

If a satellite is revolving in a radius of 3R around earth energy req 2 make it escape? I made 2 solns but can.t find out which is correct... 1. TEi=-GMm/6R so if GMnm/6R is provided it will escape ...

Could this problem be correct? if a,b,c,d and p are different real numbers such that (a2+ b2+c2)p2 -2(ab+bc+cd) p +(b2+c2+d2) ≤ 0 then a,b,c and d are in geometric progession ...

how do u compare tht 2 leaving grps?? as in wch 1 is better? ...

2 frnds after a long time decided to meet at a particular coffee shop between 5:00 pm to 6:00 pm on a specified day.they also decided that the person whho comes earlier will not wait for the second person for more than 10mins ...

A train goes around a circle, the first time with an average velocity of 100 km/h. How fast should the train be when going around the circle again a second time, so that the average velocity over the two loops is 200 km/h? ...

How many ways can the letters of the word 'computer' be arranged so that vowels occupy the even positions? In how many ways can you put 9 coins of different values into 2 pockets my cousin in engg college give me th ...

View this image: http://techtantra.in/targetIIT_images/bernoulli.jpg Explain the phenemenon! ...

I am in a car moving with constant velocity, such that i cannot see what is going on outside. I dont know whether the car is at rest or in motion. How will I find it out? (Without using any external help! ) like a speedomente ...

A heavy block of mass(high density!) is thrown into water from a boat in a small tank made for experiment. Will the water level a)increase b)decrease c) remain the same. ...

12+32+52+...........to n terms ...

solve: 2sinx=|x| +a find a such that there is no real root! ...

if a charged partical goes unaccelerated in a region containing electric and magnetic field then what are the conditions for it ...

There is a heap of sand... coefficient of friction is r... what is the maximum slope of the heap? some thing like this... or may be height.. i think same difference... u know one u know both ...

in the RC circuits in order to calculate time constant the resistance we are to take is the resistance of the branch in which capacitor is there or the net resistance of the circuit or something else? Also please reply the pr ...

does electrolytes form complex ions in aqueous solutions ...

find the sum to n terms and the nth term 1+5+19+49+101+181+295+........ plese solve the prob in details.... ...

I am not understanding these two subjects. I htink in my all prepartation this is my worst. How to improve. Pls help me. ...

How do i solve summation questions?.. what is the good way to do it? ...

y=√(x+√(x+√(x+√(x+........................ infinite times...)))) what is dy/dx? my one friend said it is easy. I dont understand :( ...

( a+x - a-x )/( a+x + a-x ) ...

1 kg of melting ice and 1 kg of boiling water are mixed: ice and water Wht is the Temperature of the mixture? ...

The minute and hour hands of the clock meet at 12 o'clock What is the next time they meet? ...

Why current in a ckt flows very fast though electron travel with drift velocity of few centimeters per second? Like if it is a very long wire, will switching on the circuit immediately take the current to the other end? why? ...

What is the effect of adding inert gas to equilibrium? please explain. ...

75 g of a metal reacts completely with 1 mole of Oxygen to form metal oxide, find the weight of metal-oxide formed. ...