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In an imperfect competitors Costs/Revenue Curve, how can the AR and MR curve at Quantity = 0, i.e. before production has even started, be non zero?? i.e. MR (the cost of production of this last unit...

Ah I see thanks. Yeah I realised there was spectra when you heated gas i.e. hydrogen but I though the temperatures were so extreme everywhere in the sun that theere would be any opportunity to do so...

How can you tell a star is mainly comprised of hydrogen from emission spectra? I thought emission spectra were related to the discrete energy levels obtainable by the electron in the atom. But in a...

Calculate the solubility of PbCl2 at 25degrees Celsius in a solution that is 0.50M in NaCl.
when solving am I correct in setting Ks = [s][2s+0.50]^2??
It doesn't seem quite right.. Im not sure how...

Determine a complex number z=x+iy that satisfies the equation 3z -iZ = 16
Where z = complex number and Z=its conjugate.
Can't seem to crack the algebra in this one.. probably some obvious way to...

Wrong substitution of y and x. The co ordinates that it passes through are 4,0 i.e.. x=4 y=0
Thus y= 1x + c ---> 0= 4 + c ----> c = -4

A general linear equation is y=mx + c. To determine whether 2 lines are parallel or perpendicular you need to look at the gradient of the equation ( the m bit ).
e.g. y=2x+5, the gradient is 2. if 2...

The Newton is a SI unit which is defined by; 1Newton is the force needed to cause an acceleration of 1m/s^2 on an object with 1kg of mass.

So yes, by its definition, Newtons divided by mass would...

Use the kinematic equations to work it out.
For question one use: d = vi*t + (a*t^2)/2
For two use v=a*t (using t calculated from question 1)
For three use the time calculated in 1) multiply by...

Hah I'm only 18 :S. I was measuring from my wrist using 2 fingers, but I first noticed it just lying in bed listening to my heart.

Take a look at the structure of sucrose.
http://www.3dchem.com/imagesofmolecules/Sucrose.gif
It contains many O-H bonds. The distribution of the charge in this O-H parts of the sucrose are such...

My pulse rate is about 1 beat per second while breathing out slowly or while not breathing in or out, but when I breath in it will skyrocket to about 2-3 times a second... is this normal??