Which of the following statements are true for an adiabatic process?

a. During an adiabatic process, the internal energy of the system changes.

b. An adiabatic process is carried out at constant temperature.

c. An adiabatic process is carried out at constant pressure.

d. During an adiabatic process, there is no heat transfer into or out of the system.

e. An adiabatic process is carried out at constant volume.

Explanation:

A process in which transfer of heat is equal to zero is defined as an adiabatic process. And, according to the first law of thermodynamics any change in the internal energy is actually in the form of work done.

This means that change in internal energy will be as follows.

         Change in internal energy = -work one by the gas

Also, in an adiabatic process there will occur change in internal energy of the system.

Therefore, we can conclude that true statements for an adiabatic process are as follows.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia