The diffusion coefficients for silver in copper are given at two temperatures: VMSE: D0 and Qd from Experimental Data T (°C) D (m2/s) 650 5.5 × 10−16 900 1.3 × 10−13 (a) Determine the values of D0 and Qd. (b) What is the magnitude of D at 875°C?

Explanation:

From the formula;

When T = 923 K and D = 5.5 x 10-16 m2/s

923 x R = Qd / [lnDo - ln(5.5 x 10-16 m2/s)] (1)

When T = 1173 K and D = 1.3 x 10-13 m2/s

Plugging the values ; and dividing equation 1 by 2

1173 x R = Qd / [lnDo - ln(1.3 x 10-13 m2/s)] (2)

b) T = 875°C = 875+273 = 1148K

Hence 1148 x 8.314 JK-1mol-1 = 196783.83 J / [ln(7.54x10-5 m2/s) - lnD]

D = 8.38x10-14 m2/s

the total distance traveled by the car is

30km + 49km = 79 km .

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card