A2 Physics | Post your doubts here

[namename]

is melting substance doing work done against the atmosphere or only the boiling?

 

[SkyPilotage]

haha yeah....it got me confused too..then i took a moment to do it again myself..and worked this way..and finally got the answer which makes sense Alhumdulilah..
happy..abt it..
this was a question which i left cuz i didnt know and nowi did it

P.S. To avoid unnecessary confusions among members, i removed that post of mines

alright nice, but i dont know.. StoneBridge kind of seemed really knowledgable, so im feeling something is wrong , although it makes alot of sense to me.

 

[SkyPilotage]

is melting substance doing work done against the atmosphere or only the boiling?

melting does very smaall/ negligible work against atmosphere.
So i think its only boiling.

 

[namename]

melting does very smaall/ negligible work against atmosphere.
So i think its only boiling.

But the internal energy will increase right?

 

[SkyPilotage]

But the internal energy will increase right?

yes to break intermolecular forces.

 

[user]

alright nice, but i dont know.. StoneBridge kind of seemed really knowledgable, so im feeling something is wrong , although it makes alot of sense to me.

which year question is it? i'll ask my friend to see whats given in the solved pastpapers [redspots]

 

[SkyPilotage]

which year question is it? i'll ask my friend to see whats given in the solved pastpapers [redspots]

June 2002 6 a) and please check 4 c) too!

 

[hassam]

well redspot mentions the graph that ZISHI posted

 

[optimistic]

I think you need to review non-inverting amplifiers.

Reviewing wont help. I don't understand it. please explain it!

 

[user]

well redspot mentions the graph that ZISHI posted

 

[SkyPilotage]

well redspot mentions the graph that ZISHI posted

 

[namename]

What is that?

 

[namename]

June 2002 6 a) and please check 4 c) too!

4c) is actually easy.. just recall PE (of SHM) is 1/2mx^2 ,so the graph would be absolute graph of the given graph (reflection as x-axis the mirror line)

 

[angelgirl:)]

o/n 2009 ppr 42....Q1c...help needed?

 

[user]

Reviewing wont help. I don't understand it. please explain it!

i dont know what u really asked
but may be this'll help

check the other 3 videos of this

 

[angelgirl:)]

o/n 2009 ppr 42....Q1c...help needed?

plz ppl help?

 

[SkyPilotage]

4c) is actually easy.. just recall PE (of SHM) is 1/2mx^2 ,so the graph would be absolute graph of the given graph (reflection as x-axis the mirror line)

check 4c again please

 

[RGBM211]

Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point:

(b) at height 0.50 times the radius of above the Earth's surface.
g = GM / r2 = (6.67 × 10-11)(6.0 x 1024) / ( (1.5 × 6.4 x 106)2 = 4.34ms-2


this example I found in the revision section of this site ermmm could someone explain me why do we multiply the radius of earth with 1.5 but not 0.5 mmmm confused ? anyone ? ​

 

[optimistic]

i dont know what u really asked
but may be this'll help

check the other 3 videos of this

thanks a lot!

 

[RGBM211]

CAN SOMEONE PLEASE ANSWER ME ?