ALL PHYSICS DOUBTS - POST HERE !!

[ambitious94]

Is it because first time, it attracts.  But when current is reversed, steel is magentically hard so hangs on to magnetism, so it repels, cos if forms poles?

DITTO

[Adzel]

Guys Remember this,

               Raul's Mother Is Visiting Uncle Xavi's Garden

[Fastal]

what do we have to know for this part of the syllabus? do we need to know Hugyens constructions and stuff?

describe the use of water waves to show-
(i)reflection at a plane surface
(ii)refraction due to a change of speed
(iii)diffraction produced by wide and narrow gaps[understand the diffraction part]

-interpret relection, refraction and diffraction using wave theory

[rhea]

Guys Remember this,

               Raul's Mother Is Visiting Uncle Xavi's Garden

and whats that?? 

[ambitious94]

Anyone can help me with Vernier calipers? ive never done it and never even heard about it in school   So anyone can tell me how to use it or anything ?

Thanks!

http://www.complore.com/using-vernier-calipers-and-micrometer-screw-gauge-0
Found it awesum!

[Raywin]

Yeah, well, the heater gave it the activation energy to BEGIN melting!
When the heater stopped, the melting that took place for the next two minutes, was by the heat energy provided by the surroundings.
That heat energy from the surroundings was also provided WITH the heater, so the 16.3 g was a combination of melting due to heater, AND melting due to heat from surroundings.
Therefore, to calculate the mass melted by THE HEATER ITSELF, we subtracting the reading WITHOUT HEATER, from the reading for both.

Ohh so u mean to say tht 16.3g of ice was melted by the heater for 2 min but this want enough to melt the ENTIRE 16.3g and since the heater was turned off, the rest of the unmelted ice (2.1g) heated because of heat from the surroundings? OHHH... i get it now!! Thanks a lot!!
+rep
  

[rhea]

hey

how do you get to know which side is the norh and the south pole when the direction of current in a solenoid is given?

[Adzel]

and whats that?? 

The Electro magnetic spectrum....easy way to remember

[Shazizzzle]

hey

how do you get to know which side is the norh and the south pole when the direction of current in a solenoid is given?

Right hand grip rule.
When the thumb is the direction of current, the coiled fingers represent the direction of magnetic field around it.
When the coiled fingers are the current, as in a solenoid, then the thumb points north.

[ambitious94]

what do we have to know for this part of the syllabus? do we need to know Hugyens constructions and stuff?

describe the use of water waves to show-
(i)reflection at a plane surface
(ii)refraction due to a change of speed
(iii)diffraction produced by wide and narrow gaps[understand the diffraction part]

-interpret relection, refraction and diffraction using wave theory

NOPE NOPE NOPE...CIE keeps it simple fortunately...
You just have to know the use of ripple tanks to demonstrate these properties of waves, diagrams representing them, changes in wavelength, speed, frequency (if any).....and be able to draw all of them. That's all =D

[Adzel]

hey

how do you get to know which side is the norh and the south pole when the direction of current in a solenoid is given?

[ambitious94]

Right hand grip rule.
When the thumb is the direction of current, the coiled fingers represent the direction of magnetic field around it.
When the coiled fingers are the current, as in a solenoid, then the thumb points north.

wow I didnt know that...thanks for sharing

[Weaam]

Can anyone draw how the picture will loook like after parts a i,ii are done in o/n 09 Q 4!
Reaaallly urgent, i cant seem to get an answer to it!
ill +rep if u help  

[Fastal]

NOPE NOPE NOPE...CIE keeps it simple fortunately...
You just have to know the use of ripple tanks to demonstrate these properties of waves, diagrams representing them, changes in wavelength, speed, frequency (if any).....and be able to draw all of them. That's all =D

thanks, can i also get a confirmation from another person just for my mental sanity XP, cuz i am spooked, my teacher told me yes i have to know hugyens construction and stuff

[ionsupreme]

Question, can anyone solve and scan ,
or at least explain how to do it, (dont worry i'll understand)

use the parralellogram method to get your resultant.