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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:
T1 = 299.18 °C
P2 = 0.00738443 MPa
Explanation:
From the data, we can get two properties for the initial condition. These are pressure and specific volume.
The pressure is 1.8 MPa and the specific volume, we can get it with the mass and volume of the container, since it’s filled this is also the volume of the water in it.
When we check in the thermodynamic tables, the conditions for saturation at 1.8 MPa we found the following:
specific volume for the saturated vapor
specific volume for the saturated liquid
Since the specific volume in our condition is higher that the specific volume for the saturated vapor, we have a superheated steam.
Looking in the thermodynamic tables for superheated steam we found that the temperature where the steam has a specific volume of at 1.8 MPa is 299.18 °C. This is the initial temperature in the container.
Since the only information that we have about the final condition is that the container was cooled. We can assume that it was cooled until a condition of saturation. So, the final pressure for the water will be the pressure of saturation for a temperature of 40°C. From thermodynamic tables we get: