(a) from the following data of yield strength versus (grain diameter)–1/2 for a cuzn alloy, determine values for the constants σ0 and ky in hall-petch equation. d-1/2 (mm)-1/2 σy (mpa) 4 75 12 175
(b) now predict the yield strength of this alloy when the average grain diameter is 1.0 × 10-3 mm.

Why is there friction between objects

Which process is represented by the pv diagram? a. the isobaric process b. the isovolumetric process c. the isothermal process d. the adiabatic process

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?