# Posts by Ankur

Total # Posts: 36

math
Construct a triangle ABC in which BC = 5.8cm ,angle B= angle C= 30°.

english
what is the need for learning foreign language?

Physics
torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.

Math
What is the unit vector in R^2 which makes an angle of π4 with both the x- and y-axes?

maths
p(p+3q)+q^2(1+2q-2)+4yz

maths
a spherical ballon is being inflated at the rate of 10 cu in/sec.find the rate of change of area when ballon has a radius of 6 inch. (a)3.33 in2/sec (b)3.67 in2/sec (c)3.11 in2/sec (d)none of these

Maths
The mean distance of the sun from the sun is 150 million kilometres.Express this in scientific notation.

Maths
The mean distance of the sun from the sun is 150 million kilometres.Express this in scientific notation.

Chemistry
Thanx someguy

Chemistry
A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 at 10 atm is 6.97 x ...

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.468×10−10 m. Determine the frequency (in hz) of the interacting photon.

Chemistry
Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters.

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.468×10−10 m. Determine the frequency (in hz) of the interacting photon.

Chemistry
The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.

Chemistry
Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.

Chemistry
Shown above are images of two amino acids, along with the pKas of each of their titrateable groups. (a) Calculate the isoelectric point (pI) of the dipeptide Glycine-Arginine. unanswered (b) Calculate the isoelectric point (pI) of the dipeptide Arginine-Glycine.

Chemistry
Answer the following questions by referencing the six stress-strain curves below. (a) Which of the stress-strain curves are for materials that are purely elastic? A B C D E F You have used 0 of 2 submissions 1.0 POINT (b) Which purely elastic material has the highest modulus? ...

Chemistry
Explain from the 4 reasons given: a b c or d ? thanx

Chemistry
xplain why the value of the band gap energy, Eg, decreases in the following homologous series: Cdiamond=5.4 eV; Si=1.1 eV; Ge=0.72eV; Sn=0.08 eV. As we move down the group, bond strength increases. As the strength increases, materials become more metallic in nature, since ...

Chemistry
Thanx mate!

Chemistry
The fictitious compound, pandemonium fluoride (PnF2) has a Ksp value in water of 3.091×10−9M3 at room temperature. Calculate the solubility of PnF2 in water. Express your answer in units of molarity.

Chemistry
The solubility of the fictitious compound, administratium fluoride (AdF3) in water is 3.091×10−4 M. Calculate the value of the solubility product Ksp.

Chemistry
The solubility of the fictitious compound, administratium fluoride (AdF3) in water is 3.091×10−4 M. Calculate the value of the solubility product Ksp.

Chemistry
Thanks mate!!!

Chemistry
You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 200.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...

Chemistry
to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 200.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of the ...

chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−5 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in...

Chemistry
Agree to Yamy

Chemistry
Its not right