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problem1) A) For Pt at 20 C compute how many unit cells there are per cubic meter.

B) How many total interstitial sites are there in one cubic meter of Pt at 20 C Which will you expect to be more probable in Pt at 20 C, vacancy diffusion or interstitial diffusion?

problem2) The 44-kg crate is hoisted up 300 inclineby the pulley system and motor M. If crate starts fromrest and, by constant acceleration, attains a speed of 4 m/s after traveling 8m along the plane, find pout the power that should be supplied to the motor at the instant the crate has moved 8m. Neglect friction along the plane. The motor has an efficiency? = 0.76.

170_Pulley system.jpg

Mechanical Engineering, Engineering

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