Find phase diagrams from cu-ni, cu-zn, cu-sn alloys and the water-salt system. for each alloy/system, indicate phases present over a range of temperatures and composition. a. are these phases solid solutions, precipitates or liquid solutions? b. if solid solutions, are they interstitial or substitutional solid solutions? c. if precipitates, are they intermetallic particles or ceramic particles? d. what crystal lattice do the solid phases have? e. is the melting temperature of water-salt a function of salt content? f. if yes, how does the melting temperature change with composition? does it make sense to use salt to melt snow? g. for each alloy, indicate the composition for minimum melting temperature

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?