Acat, also of weight wa, falls asleep on top of block a. if block b is now set into downward motion, what is the magnitude of its acceleration? express your answer in terms of some or all of the variables wa, wb, and g (the acceleration due to gravity). hints

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

One day as your professor is driving to work, another driver runs through a red light and hits his car. the professor is shaken up but survives the accident. however, the next time he starts to enter the intersection, he becomes nervous and fearful. soon, he starts going to work via another route to avoid the intersection even though this route adds twenty minutes to his commute in each direction. according to the principles of classical conditioning, why does the professor become scared of the previously harmless intersection? what can he do about this, as going via other route is very time consuming? be specific. break down the situation into its parts and show how the principles of learning apply.

What changes did japanese militarists make when they came to power?