A stress of 1000 psi is applied to a plastic material at


A stress of 1000 psi is applied to a plastic material at 270 C, and after 25 days the stress decreases to 750 psi. When the temperature is raised to 500C, the stress is reduced from 1100 to 400 psi in 30 days. Calculate the activation energy for this stress-relaxation process

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Other Subject: A stress of 1000 psi is applied to a plastic material at
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