One kg of ice at 0°C is added to one kg of boiling water. The mixture comes to
equilibrium. What is the change in entropy in cal/K of the system? (Lf = 80cal/g)
a. 300
b. 100
c. 200
d. 50
e. 25
Qcold = -Qhot
Mw*Cw*dT + Lf*Mw = -Mw*Cw*dT + Mw*Lv
All...
An automobile windshield has dimensions of 60 cm by 150 cm. What minimum tolerance in mm is needed to prevent the windshield from breaking if the temperature changes by 200°F? (The linear expansion coefficient of glass is 9×10-6 (oC)-1.)
I thought of using the area expansion formula but when...
An automobile windshield has dimensions of 60 cm by 150 cm. What minimum tolerance in mm is needed to prevent the windshield from breaking if the temperature changes by 200°F? (The linear expansion coefficient of glass is 9×10-6 (oC)-1.)
I'm thinking of using the area expansion formula but I...
thanks euclid. Sorry for the several grammatical errors. I have 4 finals coming up tomorrow, tuesday, so I am sort of stressng a bit. And not to mention that it is my first semester in college. ;D
anyways, I have to convert it to spherical? hmm, I usually convert things into polar...
oh, ya. I remember my question now. Thanks for pointing out the surface. Actually I got up to that part...z-sqrt(a^2-x^2-y^2)..my question was the limits of integrating in this problem. Thanks for pointing out the surface euclide, however, I knew what the surface was its just the graphing...
del G is fxi + fyj + fzk which is
del G = x/sqrt(a^2-x^2-y^2)*i + y/sqrt(a^2-x^2-y^2)*j -2k
then the formula says I have to dot del G to F(x,y,z) which gives me
(x/sqrt(a^2-x^2-y^2)*i + y/sqrt(a^2-x^2-y^2)*j -2k) * (x*i + y*j - 2z*k)
delG*F = (x^2+y^2)/(sqrt(a^2-x^2-y^2)...
S\int\int
F*Nds
F(x,y,z) = (xy^2 + cosz)i + (x^2*y + sinz)j + e^(z)*k
s: z = 1/2\sqrt{x^2 + y^2} , z = 8
divF = y^2 + x^2 +e^z
Q\int\int\int (y^2 + x^2 + e^k)dV
This is as far as I got, I have no idea how to do the limits for this triple integral
thanks in advance guys.
Find
s\int\intF*Nds
F(x,y,z) = x*i + y*j - 2z*k
S: Z = \sqrt{}a^2 - x^2 -y^2
I solved for delG and doted F to del G. then I converted it polar since I had x^2 + y^2
I got:
\int\intr^3/(a^2-r^2)^(1/2)drdo - 2\int\int(a^2-r^2)rdrdo
I evaluated the double integral and got...
so it doesn't matter if I make T1 positive or T2...the problem did not state whether its counter clockwise nor clockwise
and so the equation for the pulley is (t1-t2)R = I(alpha)
T1 = M1g
T2 = M2g
then I just plug and the numbers?
((19.6-9.8)(1))/5 = alpha
Two blocks, m1= 1kg and m2 = 2kg, are connected by a light string as shown in the figure (the figure is just shows a pulley with 2 blocks on each sides). If the radius of the pulley is 1m and its moment of inertia is 5kg*m^2, the acceleration of the system in g is:
I have no idea how to do...
A race car travels 44m/s around a banked (45degree with the horizontal) circular (radius = 200m) track. What is the magnitude of the resultant force in N on the 80 kg driver of this car.
I've having a hard time setting up the free body diagram.
First I broke into Fx and Fy
Fx:
F...