Recent content by Elena14

If the air resistance causes a vertical retardation of 10 percent of value of acceleration due to gravity, then the time of flight of a projectile will be decreased by nearly? Take g=10m/s^2 My attempt: Only the vertical component of the projectile will be affected by changes in g I understand...

My teacher says that "N" has no plane of symmetry(POS). But shouldn't the plane shown with blue be POS? I understand that a plane of symmetry bisects a molecule into halves that are mirror images of each other. For this reason, this plane shown here should be the POS. Where am I...

1) My teacher said that to analyze the properties of entire crystalline solid, we just need to analyze the properties of a unit cell, which is the smallest repeating unit of a crystalline solid. 2) But crystalline solids are known to be anisotropic, i.e. they have different properties in...

I haven't really come across this fact that the mixing process takes time. Will you please elaborate on this one?

My textbook says - When a hot liquid is mixed with a cold liquid, the temperature of the mixture - "is undefined for some time and then becomes nearly constant". Shouldn't the temperature first decrease and then become constant ? Why does it say "undefined" ?

That would be a very chaotic situation? If this is true, then we cannot solve the problem : A glass bulb of volume 400 ml is connected to another bulb of volume 200 mL by means of a tube of negligible volume. The bulbs contain dry air and are both at a common temperature and pressure of 293 K...

What if the two gases are at different pressures before they are mixed? Then there would be pressure and heat exchange happening at the same time?

Well, I don't know any other way to explain that thing. You can think of my question as having two parts. Firstly I want to know the flaw in my reasoning in - "Let two gases : Gas A and gas B be placed in a container . Let the gas with higher temperature be gas A and the gas with lower...

The gases A nd B have got to do nothing with that problem. I just used them to explain a concept that I thought would be utilized in the problem.

I only know of dry air as air having no content of water vapour. Why should it matter?

Okay, so 2kg water will keep on increasing temperature until it reaches 100°C. Heat required = 2* 1* 100 kcal = 200 kcal Now we have 2 kg of water at 100°C but only 400 kcal of heat to convert it into steam. So only some of the water will convert into steam. So only, (400/540)=0.74 gm water...

I don't understand why are we using those 200 kcal to boil water. Haven't we already taken into account all that heat while arriving at 600 kcal ?

When we heat the water the temperature will keep on rising till 100 °C and will stop increasing after that until all the water at 100°C has been converted to steam at 100°C(latent heat of vaporisation). Then the temperature starts rising again.

I have used the values of latent heat of fusion and vaporisation in my calculations.

Can you tell me if my reasoning about the Dalton's law was correct or not??