We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
PLEASE HELP
Change in internal energy = heat energy supplied to system + work done ON the system.PLEASE HELP
got it Thank uChange in internal energy = heat energy supplied to system + work done ON the system.
When the liquid water became water vapour, the water did work on the atmosphere, so it lost internal energy. Work hadn't been done on the system; rather the system did work. It's like a gas expanding. It does work to expand and in doing so it loses internal energy.
Basically that's why it became negative.
Is the answer B?View attachment 60059
can anyone help me with this qtn...???
First consider the left two columns of mercury. The pressure difference between the atmospheric pressure and air inside the colum is given by:View attachment 60059
can anyone help me with this qtn...???
Boyle's Law states that for given mass of gas at a constant temperature (oC or K), the product of the pressure multiplied by the volume is a constantthe gradient of boyle's law graph represents Temperature or the area under the graph? or neither of them? if we are asked to draw a graph at a higher temp and at a lower temp, why should we draw the graph of higher temp slightly above that for lower temp. I've seen that in several books but fail to understand why
thanks alots......First consider the left two columns of mercury. The pressure difference between the atmospheric pressure and air inside the colum is given by:
P - 760 = x (we are subtracting 760 from P since we can see that air inside is at a higher pressure than atmospheric pressure)
P = 760 + x ---- (i)
Now consider the right two columns of mercury. The pressure difference b/w the air inside and atmospheric pressure is given by :
P - 760 = 50 - y
P = 810 - y ----(ii)
Solve these two equations (i) & (ii), you'll get,
760 + x = 810 - y
x + y = 50
^ this expression tells us that sum of the values of x & y must be equal to 50, so eliminate all those options which do not sum up to 50. This is will relieve our headache a bit Phew! A & D are finally gone
Now you know that between B & C, there's one culprit option
Substitute the values of x & y from these two options into the equations (i) & (ii). If both the values in an option satisfy both equations, then that will be our required answer.
So put them one by one:
Option B:
780 = 760 +20 (Correct!)
780 = 810 - 30 (Correct!)
Option C:
810 = 760 + 30 (Incorrect!)
810 = 810 - 20 (Again incorrect!)
So the correct option is B.
I hope it makes sense
so basically the temperature is the product of P and V>?View attachment 60060
Boyle's Law states that for given mass of gas at a constant temperature (oC or K), the product of the pressure multiplied by the volume is a constant
The graph shows how the pressure and volume vary according to Boyles Law at two different temperatures
- At lower temperatures the volume and pressure values are lower
- so the gradient of higher temperature T2 is steeper than T1
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now