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

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

What happens when a rubber rod is rubbed with a piece of fur?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)