W06 P1
Q 9, 10, 15, 21 (urgent), 25, 26, 27, 32
Thank you 
Q9
Horizontal component: using cosine, will give us u cos angle , since acceleration of free fall acts normal to the horiz. motion, u cos angle is the correct answer
Vertical: here we use sin to calculate the vertical component (opposite/adjacent), and so its u sin angle, and since we need to take the acceleration of free fall into consideration, we include -gt. I hope that was clear.
Q10
F=ma,
the resultant force MUST be in the same direction as the acceleration, so B. I think thats all to this question.
Q15
Using the parallelogram rule, or we could find the length of the dotted line (by length i mean force), then multiply it by 2. So to calculate this force: 10 cos(30) (the dotted line) * 2 = 17.32 N
17.32 - 10 = 7.3 (the resultant force).
21
Since the total pressure is 17.5 MPa:
17*10^6 = Pressure exerted by oil +Pressure exerted by water
= 830*9.81*x + 1000*9.81*(2000-x
Solving for x would give 1270m
And hence the answer is D
25
I have doubts about this question as well, sorry.
26
A smaller gap would give a greater diffraction,
http://www.knowledgerush.com/wiki_image/7/70/Diffraction.png27
n lambda = d sin theta
n=1 theta=30
so lambda=d*0.5
and we have lambda*D=ax
D=1 and x=500d
so lambda=500d*a
solving simultaneously gives a=10^-3 so C
32
As R=V/I which is 1/gradient on the graph;
A filament lamps resistance increases as the temperature increases if the resistance increases then the gradient decreases and so D is the correct response.
Hope that was helpful
