Questions asked by Antoine
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Why do the energy levels in an atom have negative energy values?

How can you evaluate: #int_0^2(1/(1+x^4))dx#
?

A car and a computer monitor are dropped from the top of a cliff. Which one hits the ground first? Why?

How would you evaluate #int_0^pi/2 sqrt(sinx)dx# . ?

Why do energy levels converge at a continuum and what is a continuum?

Is there a button for editing a "question"? If no, then that would be a handy tool for many, i guess.

Why do Satellites in geostationary(parking) orbits, made to orbit the earth at the equator and not at other places?

Why does the earth rotate faster at the Equator?

Does the rotation of the earth affect the weight an object at different places?

Please help. How do you delete an Anwser or a Question that you double posted?

Is it true that all bodies and objects on the earth's surface are in circular motion due to the earth's rotation?

Why do energy levels converge to a continuum and what is a continuum?

What is Iodoform test?

Is it okay to double post?

What is the last digit in the number #7^(7^(7^(7^(7^(7^7)))))# ?

A satellite in a stable orbit contains two closed vessels: one of these is filled with water while the other is filled with hot steam. Why does the water exert very little pressure on its container but the steam exerts almost the same as it wouldon earth?

Is there a way to quote a fraction of someone else' answer, that would quite useful especially in comments to facilitate communication?
If not would be nice to have.
It would look like: <Antoine wrote:"blablabalabal">
Wadya think?

Is there a difference between the center of mass and the center of gravity, of an object?

Is there a way to compute a #ln# or a #log# function without a calculator? (an approximation). Say #ln2# or # ln3#

What are some algorithms used to find square root(or to approximate them)?
Say #sqrt(2), sqrt(7)#

How do you graph two or more functions on the same graph with the graphing utility on Socratic.org?

Is it acceptable to think of the whole EM spectrum as simply being light in different forms? From harmless(radio wave) to visible(visible light) to harmful(#gamma # ray)

What's the difference between: undefined, does not exit and infinity?

What's the difference between: undefined, does not exist and infinity?

How to see the number of you questions that have not yet been answered?

Define a dipole moment?

Why is synthetic rubber used for car tyres rather natural rubber?

What is the Quantum theory of light in an intuitive explanation?

What is the difference between mid value theorem an mean value theorem?

Arrange in decreasing order of strength: Covalentionicmetallic bonds. Intuitive reasons are welcome?

What chemical or physical reaction occurs in a flame?

Given that #z # is a complex number and that#z> 0# Show that #z + 1>=1#?

Given that #z# is a complex number and that #t# is real, and that #z = 2 + 3t + i(4  t)#. Show that the minimum value of #z# is #(7sqrt(10))/5#?

#z # is a complex number. Show that the equation #z^4 + z + 2= 0# cannot have a root #z# such that #z<1#?

How to express #e^(2i) # in the form #a + ib#?

#itheta = 7  4i# Find #theta# ?

Why do some metals glow when burning in a flame?

Which one is the phenomenon responsible for the appearance of rainbow in the sky: A)Interference
B)Refraction
C)Reflection
D)Diffraction?

How to evaluate:#intx^5/(x^4 + 1)^2dx#?

Show that the roots of the equation #16x^4  20x^2 + 5= 0# are #cos((kx)/10) #for #k = 1,3,7 # and # 9#
And Deduce that #cos^2(pi/10)cos^2((3pi)/10) = 5/16#?

#f(x) = (x + 1)/sqrt(x^2 + 4)#
Find #lim_(x>+oo) f(x)# and
# lim_(x>oo) f(x)#?

What physical or chemical changes occur in a flame?

What is the meaning of indeterminate form? And if possible a list of all the indeterminate forms?

What is resonance and what is natural frequency; is it the same as fundamental frequency ?

A ball is dropped from a height of 1m. Assuming that the ball will make an infinite number of bounces in an infinite time, show that the total time for which the ball bounces in terms of e(the coefficient of restitution) is #sqrt(2/g)((1+e)/(1e))# #"?"#

When you answer a question, why does it automatically make you "say thank you" for your own answer?

Evaluate #lim_(xrarroo)1^x#?

Evaluate #lim_(xrarr0)x^(1/x)#?

Evaluate #inte^(2x)sinx#?

Evaluate #intx^3/(1+x^5)?#

A mole of a substance can be defined as:
#"A."#The number of atoms in a 12g sample of C12
#"B."#The amount of substance that contains #6.02xx10^(23)# atoms
#"C."#The quantity of a substance that contains one gram formula weight of the substance?

When an atom emits radiation,
#"A."# a new element is always formed
#"B."# the mass number of the atom decreases
#"C."# the weight of the atom decrease to half its value in a fixed time
#"D."# the radiation always comes from the nucleus?

Find the roots of #e^(xcoshx)=3#?

How can you separate a mixture of nitrobenzene and phenyl amine?

What is the product when you put nitrobenzene and Tin in dilute HCl? How to predict this?

The area bounded by the curve #y=3+2xx^2# and line #y=3# is rotated completely about the line #y=3#. Find the volume of the solid of revolution obtained?

What is the line of symmetry of the graph of #y=1/(x1)#?

What is the best way of finding #sqrt(13)# without using a calculator?

What is the difference between an othonormal frame and an orthoganol frame of reference?

How many different anagrams can you form with the word POLYTECHNIQUE?

How do you sum the series #1+a+a^2+a^3+...+a^n#?

Find all the solutions for #sinx=a#?