Compressed air can be pumped underground into huge caverns as a form of energy storage. the volume of a cavern is 4.40 105 m3, and the pressure of the air in it is 6.20 106 pa. assume that air is a diatomic ideal gas whose internal energy u is given by u = 5/2 nrt. if one home uses 22.0 kw · h of energy per day, how many homes could this internal energy serve for one day?

86112 homes

Solution:

As per the question:

Volume, V =

Pressure, P =

Internal energy, U =

Energy usage of one home = 22.0 kWh

Now,

We know from the ideal gas equation:

PV = nRT

Thus we can write:

Energy usage of one home =

Now,

No. of homes that could serve this internal energy for a day is given by:

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.