For 7a, did anyone else put that the string is taut? If it's taut then both particles would move together with the same acceleration, right?
I suppose, but I think that the wording of the question was strongly implying that the string is the reason as it was asking for a modelling assumption. It said that the string was/is taut and Idon't think they said it was 'modelled as' or 'assumed to be' so I guess 'taut' sadly doesn't count. It might do, I don't know.
I suppose, but I think that the wording of the question was strongly implying that the string is the reason as it was asking for a modelling assumption. It said that the string was/is taut and Idon't think they said it was 'modelled as' or 'assumed to be' so I guess 'taut' sadly doesn't count. It might do, I don't know.
1 a. p=1/4u (3 marks) b. q=5/4u (3 marks) 2 6.66N (10 marks) 3 a. TC=75g (735N) b. m=600/7 leading to Td=2898N 4 a. u=24 (6 marks) b. t from ground to B=0.105s (3sf) (from 2.5 to ground=0.102s, total=0.207s) c. graph (3 marks) 5 a. NR of woman=708N b. max people=6 (as 6.979 people gives 10kN) 6 a. resolving by multiplying F1+F2 by -1(i)=-2(j) b. accelation √(122+62) = 13.42 c. bearing=243° (3 marks) 7 a. String is inextensible (1 mark) b. 1.6mg-T=4ma T-mg=ma (5 marks) c. a=0.12g (1.176) (5 marks) d. distance achieved by Q after P hits the ground = 3h/25, + h moved already gives 28h/25 (5 marks)
This is the official unofficial mark scheme. These are the proper answers.
PLS explain the equation of motion why no friction in the first one? q7b