Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Raywin:
--- Quote from: Shazizzzle on May 26, 2010, 05:03:51 pm ---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. :)
--- End quote ---
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:
--- Quote from: rhea on May 26, 2010, 05:06:53 pm ---and whats that?? :-\ :-\ :-\
--- End quote ---
The Electro magnetic spectrum....easy way to remember
Shazizzzle:
--- Quote from: rhea on May 26, 2010, 05:08:26 pm ---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?
--- End quote ---
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:
--- Quote from: Fastal on May 26, 2010, 05:06:25 pm ---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
--- End quote ---
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
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