Physics: Post your doubts here!

[Tkp]

The nature of an alpha particle is 2p+2n, what does this mean?!

4 nucelon number
2 proton number +2 nuceleon number=4 nucelon number

 

[sma786]

what? where is that given...?

in some notes i have

 

[sma786]

4 nucelon number
2 proton number +2 nuceleon number=4 nucelon number

thanks, got it

 

[sma786]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 1, b(i) why did they add to velocity 19 ?

ok i got it, no comments ^

 

[Tkp]

is tht a physics - related term, or just generalized??

well didnt find this in the book.

 

[Tkp]

welcome

thanks, got it

 

[Tkp]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 1, b(i) why did they add to velocity 19 ?

okay c for findind out the force u need to know the formluae f=change in p/change in t(p means momentum)
so the change in p is 0.0465(18.6+19)/(12.5/1000)

 

[sma786]

okay c for findind out the force u need to know the formluae f=change in p/change in t(p means momentum)
so the change in p is 0.0465(18.6+19)/(12.5/1000)

lol thankss, i got it already they took 19 because thats the velocity when the ball was hitting the ground

 

[sma786]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 3, b(i), why would the speed be max when the y=0 on the graph because the speed is 0 then if we use the formula s=d/t
and it is max only when the t=0.4, thats when the speed is 10ms^-1 ?!

 

[axetreme.O]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 3, b(i), why would the speed be max when the y=0 on the graph because the speed is 0 then if we use the formula s=d/t
and it is max only when the t=0.4, thats when the speed is 10ms^-1 ?!

not aware of calculations but..it is the point of time when the mass just starts to decelerate after that point.... see the gradient.

 

[sma786]

not aware of calculations but..it is the point of time when the mass just starts to decelerate after that point.... see the gradient.

got it!

 

[Obsidian Fl1ght]

Someone kindly tell me abt Laami's Theorem.

 

[axetreme.O]

Someone kindly tell me abt Laami's Theorem.

http://way2science.com/lamis-theorem/

 

[sma786]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 3, c(i)
why did they take x = 15 ? shouldnt it be 35?

 

[axetreme.O]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf
Question 3, c(i)
why did they take x = 15 ? shouldnt it be 35?

c(i) or (ii)?

 

[Obsidian Fl1ght]

http://way2science.com/lamis-theorem/

Thanks!

 

[lee mee..]

Can someone tell me how to do Q 7e please..........
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_22.pdf

 

[blueberryyums]

Goodluck to everyone in their exam(s) tomorrow. Have a good night rest and lets hope to do our best! I am hoping for an A and will fight for it in that 1 hour tomorrow. Review what you can but don't try to cram anything tonight. Sleep is as important as knowledge.

 

[sma786]

c(i) or (ii)?

i

 

[Areeba Khan]

Paper 2 -oct/nov
Q5 (a) part 2 ? hw were suppose to calculate current :/