Answer:Research is an important part of understanding how eyewitness accounts are derived. As such, a range of factors are often considered. Those factors that are within the control of the justice system are system variables
<u>Explanation:</u>
System variables consists of instructions given to eyewitness.The System variable is predefined and they cannot be changed. These variables are under the control of the justice system. These variables influence the accuracy of eyewitness in identification.
The System variable consists of all those ways which are used by the police to ask a question to a witness and procedure used to help the witness in identifying the person who has committed the crime.
With almost all substances . . .
-- when you cool them, their electrical resistance decreases.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you keep making them colder, their resistance keeps decreasing,
but it never completely disappears, no matter how cold you make them.
But with a few surprising substances, called 'superconductors' . . .
-- when you cool them, their electrical resistance decreases.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you keep making them colder, then suddenly, at some magic
temperature, their resistance COMPLETELY disappears. It doesn't
just become small, and it doesn't just become too small to measure.
It becomes literally totally and absolutely ZERO.
If you start a current flowing in a superconducting wire, for example,
you can connect the ends of the wire together, and the current keeps
flowing around and around in it, for months or years. As long as you
keep the loop cold enough, the current never decreases, because
the superconducting wire has totally ZERO resistance.
Did somebody say "What's this good for ? What can you do with it ?"
1). Every CT-scan machine and every MRI machine needs many
powerful magnets to do its thing. They are all electromagnets, with
coils of superconducting wire, enclosed in containers full of liquid helium.
Yes, it's complicated and expensive. But it turns out to be simpler and
cheaper than using regular electromagnets, with coils of regular plain
old copper wire, AND the big power supplies that would be needed
to keep them going.
2). Resistance in wire means that when current flows through it,
energy is lost. The long cables from the power-generating station
to your house have resistance, so energy is lost on the way from the
generating station to your house. That lost energy is energy that the
electric company can't sell, because they can't deliver it to customers.
There are plans to build superconducting cables to carry electric power
from the producers to the customers. The cables will be hollow pipes,
with liquid helium or liquid hydrogen inside to keep them cold, and
something on the outside to insulate them from the warmth outside.
Yes, they'll be complicated and expensive. But they'll have ZERO
resistance, so NO energy will be lost on its way from the generating
stations to the customers. The power companies think they can
build superconducting 'transmission lines' that will cost less than
the energy that's being lost now, with regular cables.
Answer:
Today's world leaders must take Hitler as a <u>totally negative reference</u>, since taking advantage of the need of his people to introduce extremist ideas or hatred towards other countries is too cruel and wrong an act, on the other hand, it must imply that <u>any leader could abuse his power with adequate propaganda and circumstantial manipulation</u>, so it is the people who must be objective regarding political reality and distinguish which leader to follow and which not to follow.
Explanation:
<u>History must serve us to avoid making exactly the same mistakes of the past</u>, so a person who wants to lead a group of people properly, must be aware that in past years some leaders like Hitler have abused their power and that type of error, taking advantage of the trust or the ignorance of your people, should never be committed again.
Answer:
The adults defend their young using an array of alarm calls and distraction displays. They will also dive-bomb predators if the eggs or nestlings are in danger. Nesting: Nest building is a task of males and females. Nesting American Avocets aggressively attack predators to protect the nest site.
Explanation:
It depends on the subject matter of the presentation. If persuasion is your goal, then use emotional appeals, but if you're simply trying to present for the purpose of informing, then analytical is the way you should go. <span />