Physics, Chemistry and Biology: Post your doubts here!

[gary221]

Heyy guys can anyone please explain me http://www.freeexampapers.com/index.php/directory/download?location=IGCSE/Physics/CIE/2000 Nov/0625_w00_qp_01.pdf question number 3? why isnt the acc=0 at y..Thanks

wts the ans?
is it C?

 

[daisyy]

wts the ans?
is it C?

Nope it's D :S

 

[gary221]

Nope it's D :S

okay, got it.
see when we ignore air resistance, no resistive forces act on the ball.
so velocity of the ball only depends on the gravitational force.
so since the only force acting on the ball is the g-force...(which does not change with the position of the ball) unlike air resistance, hence the acceleration of the ball(due to gravity) will be the same at all positions.
Hence, ans = D
Hope u gt it!
All credit to Nibz

 

[daisyy]

okay, got it.
see when we ignore air resistance, no resistive forces act on the ball.
so velocity of the ball only depends on the gravitational force.
so since the only force acting on the ball is the g-force...(which does not change with the position of the ball) unlike air resistance, hence the acceleration of the ball(due to gravity) will be the same at all positions.
Hence, ans = D
Hope u gt it!
All credit to Nibz

Got it that makes sense! Thanks a lot

 

[Gehad Mohamed]

Can please anyone explain Q 31 why the ans is D not B in http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf

 

[Iridescent]

Can please anyone explain Q 31 why the ans is D not B in http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf

The answer is not B because if B breaks, C and D will still work because does not come in their path, from or to the battery. But, if D breaks none of the lamps light as their path to the battery has been disrupted.

 

[Gehad Mohamed]

The answer is not B because if B breaks, C and D will still work because does not come in their path, from or to the battery. But, if D breaks none of the lamps light as their path to the battery has been disrupted.

But if D is possible A is also right !!

 

[Iridescent]

But if D is possible A is also right !!

If A breaks, C and D still have their route to and from the battery. They are parallel to A. So, C and D will work. Thus, D is the only possible answer.

 

[Gehad Mohamed]

The answer is not B because if B breaks, C and D will still work because does not come in their path, from or to the battery. But, if D breaks none of the lamps light as their path to the battery has been disrupted.

U mean it passes from the negative of the battery !

 

[Gehad Mohamed]

If A breaks, C and D still have their route to and from the battery. They are parallel to A. So, C and D will work. Thus, D is the only possible answer.

Okay thanks alot

 

[Iridescent]

U mean it passes from the negative of the battery !

Somehow! All the other are connected to the positive terminal. So, if the path to the negative terminal is disrupted, the circuit becomes incomplete and the lamps don't light up.

 

[Gehad Mohamed]

Somehow! All the other are connected to the positive terminal. So, if the path to the negative terminal is disrupted, the circuit becomes incomplete and the lamps don't light up.

Okay now i fully got it thanks a million

 

[Iridescent]

Okay now i fully got it thanks a million

You're welcome

 

[shazmina]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf could sum1 help me wid question no 3...nd btw y de answer A...TNXS

 

[Al-Anoud]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf could sum1 help me wid question no 3...nd btw y de answer A...TNXS

ok shud i explain? or do u want sum1 else to? :\

 

[shazmina]

hello guys....may i knw how is de thermal capacity linked with the time taking for heating...plzzzzzz

 

[shazmina]

ok shud i explain? or do u want sum1 else to? :\

sure plz proceed..

 

[Al-Anoud]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf could sum1 help me wid question no 3...nd btw y de answer A...TNXS

ok shazmina since the car accelerates t level with pole 4...it will speed up in the beginning and slow down by the time it reaches pole 4....the ans. is A cuz it travels the fastest b\w pole 1 and 2...so least time taken! hope u get it!

 

[Al-Anoud]

nooooooo!!!!!!! soooryy! missread the question

 

[Al-Anoud]

tnxs tnxs tnx u soooooooooo mch i gt it.....tnxs a billion..

wait...duznt it ask abt the slowest! sorry i dont get it either!