Answer:
The temperature change is -633.15K
Explanation:
If we considered the expansion as a reversible one (to be adiabatic is one of the requirements), the work done by expansion can be written as:
Where 2 and 1 subscripts mean the final and the initial state respectively. The equation negative sign says that for an expansion of the gas, the system is making work, so the energy is going out of the system.
Using the ideal gas equation, it is possible to change volume and pressure by temperatures:
So,
This result makes sense considering that the volume increases, so it is expected that the temperature decreases.
pushing on something that pushes back = action and reaction.
Gravity is non contact. Action at a distance. Hence stones wil fall if dropped.
Answer and explanation:
The right answer is b) "The excess charge has distributed itself evenly over the outside surface of the sphere".
The hollow metal sphere is a conductor. This means that charges can move freely over its surface. On the other side, a metal body act as an equipotential body. Once some charge is set and there is no voltage differential imprinted over the body, to keep being an equipotential body the charges must distribute evenly on the external surface. Must not exist charge in the volume, or would exist an electrical field and therefore a voltage differential. Also, the charge distribution in the internal surface must be null. If you apply gauss theorem with a gaussian sphere with a radius between the internal and external surface, knowing that field E is null, the enclosed charge must be null.
Explanation:
cellulose and pectin are present on the cells of collenchyma...
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