Sublimation is to change from
2 answers:
Answer:
The process in which a solid changes directly into gaseous form, without transcurring to the "intermediate-form" which would be the liquid form.
Explanation:
Some elements or substances can go directly from solid to gaseous form, and that process is called sublimation.
A common example of sublimation would be the sublimation of dry-ice, which is solid . When the temperature of the dry ice reaches -78.5 ºC or higher, it will start becoming a gas.
Remember:
Solid → gas = sublimation
Solid → liquid = fusion
Gas → liquid = condensation
Gas → solid = deposition
Liquid → gas = evaporation
Liquid → solid = solidification
Hope it helped,
BiologiaMagister
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Answer:
a) E = b) i.
Explanation:
Assuming no other forces acting on the electron, as the field is pushing the electron back till it comes to rest momentarily, applying the work-energy theorem, the loss in kinetic energy, must be equal to the work done by the field on the electron.
The force that does work on the electron is the one due to the electric field E, and by definition of electric field, can be expressed as follows:
W = q*E = -e*E (1)
This work must be equal to the change in Kinetic Energy:
ΔK = Kf -K₀ = 0 - K = -K (2)
From (1) and (2), and solving for E, we have:
E =
b) As the electric field (by convention) has the direction that it would have a positive test charge, the electrons (being negative charges),when starting from rest),have the direction opposite to the field.
In this case, as the electron has an initial velocity, and the field is opposing to the electron movement, we conclude that the electric field is in the direction of the electron´s motion, due to the electron slows down, and then comes momentarily to an stop, before changing direction and move opposite to the field as it is its natural behavior.
Answer:
When water is surrounding T_s = 34.17 degree C
When air surrounding T_S = 1434.7 degree C
from above calculation we can conclude that air is less effective than water as heat transfer agent
Explanation:
Given data:
length = 300 mm
Outer diameter = 30 mm
Dissipated energy = 2 kw = 2000 w
Heat transfer coefficient IN WATER = 5000 W/m^2 K
Heat transfer coefficient in air = 50 W/m^2 K
we know that
From newton law of coding we have
is surface temp.
T - temperature at surrounding
solving for[/tex] T_s [/tex] w have
When air is surrounding we have
from above calculation we can conclude that air is less effective than water as heat transfer agent