I saved all my answers on my graphical calculator. I do not remember the questions, and will edit this thread according to the general feedback of the answers. Some of these may be wrong, again, these are simply my answers.
Updated version, 09:11 25th May 2012. I have included some very general "questions", so people can jog their memories to the question. A small summary follows the x), and the answer is the bit after the colon [:]. Again, any errors, please let me know so I can edit them. Question 6c) changed according to the general consensus. I have added what I can remember to be the marks allocated per question. I do not know if they're right, I have done them purely from memory. I have laid it out in a format people might be able to understand a bit easier. Prior to this it was a bit of a mess, rofl.
1 - Ship on water:
a) Question: Find the resultant velocity (2 marks):
Answer: 5.39
b) Question: Find the bearing (3 marks):
Answer: 338
2 - Momentum:
2) Questions: Find the mass of B (3 marks):
Mass: 0.5
3 - Car braking to a halt:
ai) Question: Find the acceleration of the braking car (3 marks):
Answer: -2
3aii) Question: Can't remember (2 mark)
Answer: 10
3aiii) Question: Braking force when no other forces present (2 marks):
Answer: 2800N
3b) Question: Braking force when air resistance of 200N is present (2 marks):
Answer: 2600N
4 - Particle in equilibrium. Force of 20N going at an angle of alpha, and in the opposite direction, a force of 10N.
a) Question: Find alpha (2 marks):
Answer: 60
b)Find W, (Weight) (3 marks):
Answer: 17.3
c)Find the mass of the particle (2 marks):
Answer: 1.77
5 - Block and particle system.
a) Question: When smooth, find the acceleration (3 marks):
Answer: 5.88
bi) Question: When rough, find the tension (3 mark):
Answer: 122.4
bii)Question: Find the Reaction Force(?) (2 mark):
Answer: 117.6
biii) Question: Find the coefficient of friction (5 mark):
Answer: 0.735
c) Make two assumptions not included in question (2 mark):
Answers: No air resistance, block is uniform in mass, tension is constant throughout the string, block is modeled as particle, string does not snap, string does not hit the ground before the block hits the peg.
6 - Some stupid girl with a sledge, who has most probably cost a lot of people a few marks, for forgetting the Tcos30.
a) Question: Draw a diagram of the forces acting on the sledge when modelled as a particle (2 marks).
b) Question: Find NR in terms of T (3 marks):
Answer: NR = 78.4 - 0.5T
c) Question: Find tension when acceleration is 0.05 (6 marks):
Answer: 23.5
7 - Vector question. Unsure of the following questions. i and j vectors.
a) Question: Unsure. Maybe express t in terms of s? (2 marks):
Answer: s = (-i+3j)+0.5(0.1i-0.2j)t^2
b) Question: Again, unsure (3 marks):
Answer: 30
c) Question: Find the speed when going SE. Needed to form an equation of v=u+at, not s = (-i+3j)+0.5(0.1i-0.2j)t^2 (6 marks):
Answer: 1.41
8 - Projectile. She fires at an angle of alpha with speed 22.4.
a) Question: Find alpha (2 marks):
Answer: 61 degrees
b) Question: Find maximum height (3 marks):
Answer: 19.6
c) Question: Find horizontal distance(?) (3 marks):
Answer: 43.4
d) Question: Find the length of time at which the particle is above 5m. Most people seem have gotten 3.46 seconds, so I have changed it to that (6 marks):
Answer: 3.46
e) Find the speed at which the particle hits the ground (2 marks):
Answer: 10.8