Homework Statement
The electric field equals 19j for points above plane 'r', -31j between the planes, and -19j below plane 's', where j is the unit vector in the +y direction and the fields are in V/m. Calculate σr, the suface charge density for plane 'r'.
positive y- straight up
positive...
the cube is along the axes. imagine the origin, then having x-point to your left, y-point to your right and z-point straight up. but I am not sure how to integrate this problem..
Homework Statement
How much ice (in grams) would have to melt to lower the temperature of 351 ml of water from 24 deg C to 5 deg C? (Assume the density of water is 1.0g/ml .)
Homework Equations
q=mc(deltaT)
The Attempt at a Solution
m=351 g c=4.18J/g*C deltaT=19deg C...
Homework Statement
What is the magnitude of the electric field at a distance of 5.00 ×10−10 m from a radon nucleus?
=4.95×1011 N/C
What is the magnitude of the force on an electron at that distance?
=7.94×10-8 N
Now here is where I am getting stuck..
Treating the electron classically...
alright knowing this, i use 'a' as the vap press for cacl2 and 'b' for vap press of water? then use molecular weights to to solve for total mass of solution..?
% by mass concentration
Homework Statement
An aqueous CaCL2 solution has a vapor pressure of 80.8mmHG at 50 degree C . The vapor pressure of pure water at this temperature is 92.6 mmHG .
What is the concentration of CaCl2 in mass percent?
Homework Equations
% by mass = mass solute/mass...
pi and 0? pi would be the one to choose. so set either equation? equal to pi and solve for t. that's is where I am getting tripped up at. which equation to use. does it make a difference because they have different phases?