Mechanics 1 P42 2014; Discussion!

[thementor]

are you sure it was -6? i just asked the ques from my sir and he said that when B reaches the floor the o.25 kg mass travels up due opto the velocity gained by it hence the tensions in both the strings become slack.. therefore the deceleration of the 0.5 kg mass (p) would be equal to Reaction force into coefficient of friction i.e 5 x 0.4 = (0.5) a. which gives a to be 4 .. ps my answer was -6 too . and do you by any chance remember what the ques was worth becuase i dont think it was worth only two marks..

There were two separate strings. Both of them cannot become slack. Also the question was worth 2 marks. I have a good memory so yes it was worth 2 marks.

 

[Oishee Asif]

are you sure it was -6? i just asked the ques from my sir and he said that when B reaches the floor the o.25 kg mass travels up due opto the velocity gained by it hence the tensions in both the strings become slack.. therefore the deceleration of the 0.5 kg mass (p) would be equal to Reaction force into coefficient of friction i.e 5 x 0.4 = (0.5) a. which gives a to be 4 .. ps my answer was -6 too . and do you by any chance remember what the ques was worth becuase i dont think it was worth only two marks..

Plus if they were both slack, how the eff would they move again? Like P has enough strength to magically make the strings back to normal?

 

[shakky]

There were two separate strings. Both of them cannot become slack. Also the question was worth 2 marks. I have a good memory so yes it was worth 2 marks.

thanks , do you temember how much the first and second parts were worth (same ques) i think i misread acceleration 2 for 2.5 and applied **** logic to prove that the acc was 2.5 which means that my velocity is probably going to be wrong aswell i dont remember for sure but still also do you think i can get an A if i get 55 in p1 and 40 in m1 ?

 

[Oishee Asif]

Looks we´ve got some company! Though, not sure they did as bad as me! ^^

Bit rude.

 

[thementor]

thanks , do you temember how much the first and second parts were worth (same ques) i think i misread acceleration 2 for 2.5 and applied **** logic to prove that the acc was 2.5 which means that my velocity is probably going to be wrong aswell i dont remember for sure but still also do you think i can get an A if i get 55 in p1 and 40 in m1 ?

Both the first and second parts were worth 3 marks each.
well if you get a 40 in m1 and 55 in p1 your total score will be 95, so yes you may score an AS Level A(a). However it will probably be a low A(a)

 

[thementor]

Plus if they were both slack, how the eff would they move again? Like P has enough strength to magically make the strings back to normal?

lol true

 

[Oishee Asif]

Both the first and second parts were worth 3 marks each.
well if you get a 40 in m1 and 55 in p1 your total score will be 95, so yes you may score an AS Level A(a). However it will probably be a low A(a)

I was just about to say 'Low A'! <3

 

[thementor]

I was just about to say 'Low A'! <3

Great minds think alike.

 

[Oishee Asif]

Great minds think alike.

Indeed, indeed.

 

[arwa_5310]

can someone post the marks on all the questions plz? and if i got the distance with limits 0-25 how many marks
i will lose? and if i didnt notice the weight in the tension question and used lami's method i will lose the whole question?
please someone reply

 

[@mtsharaf2]

U just posted 2 6 and 7
Where are the rest

 

[Oishee Asif]

I also posted 3, 4 and 5. D:

U just posted 2 6 and 7
Where are the rest

 

[@mtsharaf2]

From about how much is an A from ?

 

[A star]

Both the first and second parts were worth 3 marks each.
well if you get a 40 in m1 and 55 in p1 your total score will be 95, so yes you may score an AS Level A(a). However it will probably be a low A(a)

nope second part was like 2 marks and first part 3 maks i remeber cause i spent the last minute how many marks would i loose in this question

 

[hamaas]

if i get 30 in mechanics and 700 in p1 then will it be a low scoring A?

 

[hamaas]

SORRY 70 IN P1

 

[Oishee Asif]

SORRY 70 IN P1

Yes, it would be. Unless the GT for M1 was really low.

 

[thementor]

nope second part was like 2 marks and first part 3 maks i remeber cause i spent the last minute how many marks would i loose in this question

the whole question was worth 10 marks in total. The last two parts were 2 marks each. The first two parts were 6 marks each.
Does it matter? lol

 

[raysonzaffar]

the whole question was worth 10 marks in total. The last two parts were 2 marks each. The first two parts were 6 marks each.
Does it matter? lol

First 2 parts were 6 marks each. WOW
So 6+6+2+2 = 10
10/10 for the maths you used there
The first 2 parts were for 3 marks each.

 

[huh]

Can someone please tell me for the collision question, what was T? Was it 8?