Consider the density operator for the system of two spin-1/2 particles, where s) is the singlet state. a) construct the density matrix. b) find values of α at which this density matrix satisfies the coherence criterion for c) evaluate the concurrence for this density matrix, find a at which entanglement de- d) write down the reduced density matrix and evaluate the conditional entropy.

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

What are the differences and relationships between speed, velocity, and acceleration