Assume that for an 800 mhz or 800 000 000 hz magnet, all the 1h
nuclei would precess at frequencies between 800 008 500 hz and 799 991
500 hz. would a 10 μsec pulse would be short enough to ensure all the
nuclear spin vectors were tipped into the x-y plane? what is the longest
pulse that would be acceptable? )

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Idon’t quite understand this problem

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final