Biology; Chemistry; Physics: Post your doubts here!

[FLRNAB]

So in solidifying Potential energy is lost?!

Yeah. Think of it like GPE.

As you move closer to earth you lose GPE.
As a molecule moves closer to another molecule it loses it's PE

 

[peacce]

Image is not formed at one point in other options.

i seeeee

 

[Uchiha-Sasuke]

30
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w06_qp_1.pdf
MS
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w06_ms_1.pdf
what's the fault here that is not corrected ?

 

[FLRNAB]

30
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w06_qp_1.pdf
MS
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w06_ms_1.pdf
what's the fault here that is not corrected ?

Current is flowing through the Earth wire. Earth wire has very low resistance so a very large current flows from the live wire blowing the fuse.

 

[***amd***]

Ahmad, it's written electric current/ electronic current which is flow of electrons. I said if they haven't mentioned anything.

oh yes .-. i misread the Q.

baqi Qs ki problems k solutions bhi inayat ker di jiye?

 

[funky brat]

Mujhey koi CRO samjha deeeeeeee funky brat Dream.Eater Dark Destination

Okay.
See CRO has three components. Electron gun, deflection plates and Fluorescent screen.
1- Electron gun= It is so called because it emits electron. As you know that metals have valence electrons that are losely held so when they are heated by a typical value of voltage and current (6.0 volts, 0.3A) the electrons are able to escape form the metal forming cathode rays. Cathode rays so called because because emitted from cathode. Now the amount of electrons flowing towards the screen are controlled by a grid which has a negative potential. The electrons themselves are negatively charged. So they are repelled by the grid. The potential of this grid is controlled by a button on the CRO and this actually controls the brightness of the screen.
2-Now comes the deflection plates. X plates and Y plates. X plates are themselves vertical but their deflection is horizontal while Y plates are horizontal and their deflection is vertical. In actual when you see the spot moving up and down on the screen this is because of the deflection by y plates and if their is a waveform on the that means time base is also switched on. X plates provide a sawtooth voltage and help to sweep the dot across the screen. It also determines the time taken for the dot to move from extreme left to right.
3- The screen is coated with some salt that shines when it is struck by electrons and is visible as a dot on the screen.

 

[***amd***]

For Q#4 Ans is B ??

yes

 

[funky brat]

oh yes .-. i misread the Q.

baqi Qs ki problems k solutions bhi inayat ker di jiye?

Acha ruko.

 

[***amd***]

another mind-BLOWING question hahah
explain somebody View attachment 42794

answer is A?

 

[Uchiha-Sasuke]

Current is flowing through the Earth wire. Earth wire has very low resistance so a very large current flows from the live wire blowing the fuse.

don't get it :S

 

[princess Anu]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s08_qp_1.pdf
34 , 23 and 8 pleaseeeee

 

[Awesome12]

Could you give a more detailed ans?If energy is being given out,why is KE constant? Awesome12

See the temperature is not changing, which means that the molecules still have the same energy. However since the state is changing, they are losing PE

 

[peacce]

Okay.
See CRO has three components. Electron gun, deflection plates and Fluorescent screen.
1- Electron gun= It is so called because it emits electron. As you know that metals have valence electrons that are losely held so when they are heated by a typical value of voltage and current (6.0 volts, 0.3A) the electrons are able to escape form the metal forming cathode rays. Cathode rays so called because because emitted from cathode. Now the amount of electrons flowing towards the screen are controlled by a grid which has a negative potential. The electrons themselves are negatively charged. So they are repelled by the grid. The potential of this grid is controlled by a button on the CRO and this actually controls the brightness of the screen.
2-Now comes the deflection plates. X plates and Y plates. X plates are themselves vertical but their deflection is horizontal while Y plates are horizontal and their deflection is vertical. In actual when you see the spot moving up and down on the screen this is because of the deflection by y plates and if their is a waveform on the that means time base is also switched on. X plates provide a sawtooth voltage and help to sweep the dot across the screen. It also determines the time taken for the dot to move from extreme left to right.
3- The screen is coated with some salt that shines when it is struck by electrons and is visible as a dot on the screen.

tthhaankyyoouu

 

[fatima sheikh]

describe, with the aid of a block diagram, one type of fission reactor for use in a power station
plz can anyone explain this........

 

[asadalam]

See the temperature is not changing, which means that the molecules still have the same energy. However since the state is changing, they are losing PE

Ah thanks!And in change from solid to liquid,they are gaining PE and not KE?

 

[exploded diper]

Ah thanks!And in change from solid to liquid,they are gaining PE and not KE?

See it as exothermic reactions..as bond are being formed......so energy is being released.....

 

[kirann]

answer is A?

yes

 

[Uchiha-Sasuke]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s08_qp_1.pdf
34 , 23 and 8 pleaseeeee

8 : 2N downward force on C ... perpendicular distance is QC (0.3) 0.3*2= 0.6 Nm
23: attachment
34: A doesnt matter C: it is D: doesnt matter ... so B very low emf is induced which cant be seen on ammeter by eye

 

[princess Anu]

8 : 2N downward force on C ... perpendicular distance is QC (0.3) 0.3*2= 0.6 Nm
23: attachment
34: A doesnt matter C: it is D: doesnt matter ... so B very low emf is induced which cant be seen on ammeter by eye

23: why not 6?

 

[Dark Destination]

What the hell are capacitors, and what is a time-delay circuit? :/

What is a reed relay? What is a circuit breaker? What is a diode?

What is PHYSICS?