Physics

[hdbkiwi]

i have a question ... did bio paper 1 have repeated question .... like was it papers from 1996 to 2008 ..... or wat ??

was it current repeated questions or old repeated question ??

hmm...as i recall there was only ONE or max TWO repeated questions from like 2002 or 2003 i guess


Thanks, Best Wishes

so they are all new questions ??

Think about it-there are 80 questions each year, so over 10 years, there has been 800 questions-syllabus hasn't changed-that much- so of course there will be MANY repeats so just do past papers and if you do well yoiu will be GREAT 

[-_-]

i have a question ... did bio paper 1 have repeated question .... like was it papers from 1996 to 2008 ..... or wat ??

was it current repeated questions or old repeated question ??

hmm...as i recall there was only ONE or max TWO repeated questions from like 2002 or 2003 i guess


Thanks, Best Wishes

so they are all new questions ??

Think about it-there are 80 questions each year, so over 10 years, there has been 800 questions-syllabus hasn't changed-that much- so of course there will be MANY repeats so just do past papers and if you do well yoiu will be GREAT 

yupp haha


Exactly, Do As Much As You Can

[Aishath]

hi i hv a physics questions..

"An unstable nucleus has 145 neutrons and 92 protons. It emits a beta-particle.
How many neutrons and protons does the nucleus hv after emitting the beta particle?"

its on Oct/Nov 2005, ppr 1, ques.39

Can someone please please help me???

[astarmathsandphysics]

hi i hv a physics questions..

"An unstable nucleus has 145 neutrons and 92 protons. It emits a beta-particle.
How many neutrons and protons does the nucleus hv after emitting the beta particle?"

its on Oct/Nov 2005, ppr 1, ques.39

Can someone please please help me???

a neutron changes into a proton so 144 neutrons and 93 protons

[Ghost Of Highbury]

B -  neutrons - 144 ; protons - 93

the neutron splits into = proton + electron

[Aishath]

y does a neutron change into a proton?

[Ghost Of Highbury]

when a beta particle is emitted

a neutron splits into a proton and an electron

[astarmathsandphysics]

y does a neutron change into a proton?

a neutron is unstable.

The proton electron combination has less energy

[Aishath]

ohhhh ok.
I think i get it now. 
Thanks!!!!

[Ghost Of Highbury]

welcome..

[Aishath]

Hey can someone tell me the answer for Oct/Nov 2007 ppr 1 ques. 8?
Nd y is it that answer?

[Ghost Of Highbury]

its is "C"

because u draw a perpendicular line and drop it from point C


u will notice that it has not crossed the base line and therefore it has not toppled yet
whereas it does from point A,B and D

 

[astarmathsandphysics]

Fuses

blow if there is a short cicuit. They are connected in the live wire -brown or red- on the way to the unit. Then for example when a cable inside the a electric unit touches a metqal case the case can become live and give a shock to any person touching the case. To stop this the fuse blows as soon as any live cable touches the case then current is not allowed to reach the unit.

They come in various sizes 3A, 13A for example. The fuse should not blow if there is a normal operating current flowing. If a unit demands a 3A current, fit a 5A fuse

[Aishath]

umm. i so sorry bt i am really bad at finding centre of mass
Wat is base line?? and draw perpendicular to wat? the tables?

[Ghost Of Highbury]

find the attached diagram

notice that the red line (perpendicular) dropped from point C  doest not exceed/ cross the blue line (base of the glass)

whereas for the rest of the points , it does

(if the perpndicular from the center of mass crosses the base line => the object topples)