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notka56 [123]
3 years ago
12

The diffusion coefficients for species A in metal B are given at two temperatures: T (°C) D (m2/s) 1020 8.01 × 10-17 1290 7.86×

10-16 (a) Determine the value of the activation energy Qd (in J/mol).

Physics
1 answer:
Solnce55 [7]3 years ago
5 0

Explanation:

Below is an attachment containing the solution.

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The tub of a washing machine goes into its spin cycle, starting from rest and gaining angular speed steadily for 6.00 s, at whic
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Answer:

N = 42 rev

Explanation:

As we know that initial angular speed of the tub was zero and then it increases uniformly to 4 rev/s in t = 6.00 s

so we will have

\theta_1 = \frac{\omega_f + \omega_i}{2} t

\theta_1 = \frac{2\pi f_2 + 2\pi f_1}{2}(t)

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Now when the tub will comes to rest uniformly after opening the lid in time interval of t = 15 s

then we have

\theta_2 = \frac{\omega_f + \omega_i}{2} t

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\theta_2 = \frac{2\pi \times 4 + 0}{2}(15)

\theta_2 = 188.5 rad

Now total angular displacement of the tub is given as

\theta = \theta_1 + \theta_2

\theta = 75.4 + 188.5

\theta = 263.9 rad

so number of revolutions is given as

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