Physics Unit 4 JUNE 11/6/12

[*Sandra*]

First find the energy released using e = (delta)mc^2
then make it a ratio like 1fission = x J of energy, then yfissions = 2.5GW and cross multiply...
we dont have the number of molecules or half-life so we cant use the radioactive decay eqns

ths ans is 4 the que in september 2011 20 years after the cylinder?

 

[étudiante]

ths ans is 4 the que in september 2011 20 years after the cylinder?

Sorry.... i quite dint get what ur asking

 

[*Sandra*]

Sorry.... i quite dint get what ur asking

Q17 part (d)

 

[étudiante]

I misunderstood which question u were asking... really apologize
n yeah in this question u can use the activity equation

 

[*Sandra*]

I misunderstood which question u were asking... really apologize
n yeah in this question u can use the activity equation

no its ok ya i used the 1 like we use in discharing of capacitor bt then after finiding the final activity then further use the equation A= decay constant x N i was wondering y they used ths if we already found the remaining caesium?

 

[étudiante]

We can find the initial number of molecules using A = N(lambda) den insert it into that complicated equation to get the no of atoms left

 

[*Sandra*]

We can find the initial number of molecules using A = N(lambda) den insert it into that complicated equation to get the no of atoms left

hehe ya complicated equation thanks alot nw im goin 2 send u a paper containing al ocillation ques and i hve doubt in sme so if u can solve them so ican check my answers bt its helpful cuz its classified 4 ths topic

 

[étudiante]

hehe ya complicated equation thanks alot nw im goin 2 send u a paper containing al ocillation ques and i hve doubt in sme so if u can solve them so ican check my answers bt its helpful cuz its classified 4 ths topic

Ur welcome no problem
n surieee! It'll be good for me too, I'll solve it tonight n u keep me posted on the doubts n i'll get back to u

I really owe u a thanks u know, ur giving me so much practice (cuz otherwise i pretty much left physics aside for now )

 

[*Sandra*]

We can find the initial number of molecules using A = N(lambda) den insert it into that complicated equation to get the no of atoms left

Q's 4,5 and 6 whn u can do them plz tel me the ans and sry again

 

[*Sandra*]

Ur welcome no problem
n surieee! It'll be good for me too, I'll solve it tonight n u keep me posted on the doubts n i'll get back to u

I really owe u a thanks u know, ur giving me so much practice (cuz otherwise i pretty much left physics aside for now )

its ok

 

[étudiante]

Q's 4,5 and 6 whn u can do them plz tel me the ans and sry again

W-o-W! dis is awesome! I'll do dem n let you know by tonight Inshallah

thanks SO much! mind if ask, do u have other chapters as well? and a mark scheme or something for it so we can cross-check?

n no need for the sorries, i need to thank you n keep it comming

 

[*Sandra*]

W-o-W! dis is awesome! I'll do dem n let you know by tonight Inshallah

thanks SO much! mind if ask, do u have other chapters as well? and a mark scheme or something for it so we can cross-check?

n no need for the sorries, i need to thank you n keep it comming

ya ofcourse i'll send u the whole file and plz do u hve any notes abt forced oscillations and resonance im really confused a bit in tht
tell me if they reached u

 

[*Sandra*]

ya ofcourse i'll send u the whole file and plz do u hve any notes abt forced oscillations and resonance im really confused a bit in tht
tell me if they reached u

I need u 2 help me in the difference between forced oscillation and resonance

 

[étudiante]

I need u 2 help me in the difference between forced oscillation and resonance

Sure, i'm going thru that paper now n thanks SOOOOOOOOOOo much :')
I'm also getting suck on question 4 :S I'll try again tomorrow after revising Inshallah
(Sorry for the delay )

n forced oscillations is whenever we cause nething to vibrate at any frequency EXCEPT its natural frequency while resonance is ONLY at natural frequency

 

[*Sandra*]

Sure, i'm going thru that paper now n thanks SOOOOOOOOOOo much :')
I'm also getting suck on question 4 :S I'll try again tomorrow after revising Inshallah
(Sorry for the delay )

n forced oscillations is whenever we cause nething to vibrate at any frequency EXCEPT its natural frequency while resonance is ONLY at natural frequency

Ya they r lil tough and do we hve 2 study the experiments like the one's given in the paper?and if we push smethng and let it oscillate freely then its oscillating at its natural frequency bt there is no resonance so how we can cause resosnance?

 

[étudiante]

Ya they r lil tough and do we hve 2 study the experiments like the one's given in the paper?and if we push smethng and let it oscillate freely then its oscillating at its natural frequency bt there is no resonance so how we can cause resosnance?

Do u have the mark schemes for them by any chance?

nopes! dat is a forced oscillation if we just push it at any frequency, BUT if dat frequency is the same as the natural frequency of the object it will vibrate with a much greater amplitude, showing that resonance has occured

 

[*Sandra*]

so the driving frequency shld equal the natural frequency of the object oscillating?and ya the mark scheme is given u can c tht two files with the same name 1 is 4 ques and the other 4 answers

 

[étudiante]

yup dats it
oh ohkay Thanks I'll just go over SHM once n den try those questions now

 

[*Sandra*]

yup dats it
oh ohkay Thanks I'll just go over SHM once n den try those questions now

sure

 

[*Sandra*]

yup dats it
oh ohkay Thanks I'll just go over SHM once n den try those questions now

ok i wanna ask u q(11) is it necessary 4 us?