Some of the questions in it. The last question I remember about the sin and cos graphs which was weird. Overall got 89% UMS still.
Hm
I don't remember much about it but I was weirded out because so many people were complaining. As I said above, maybe just the question style didn't come across easily to many people
I don't remember much about it but I was weirded out because so many people were complaining. As I said above, maybe just the question style didn't come across easily to many people
The last I remember it being something like alpha = some symbol * cos (vita - another symbol) and I'm not sure what the extra weird part was but I think a part had something like putting on the graph where alpha = vita. Again don't remember much but I hated that question, can't really remember the others so much.
The last I remember it being something like alpha = some symbol * cos (vita - another symbol) and I'm not sure what the extra weird part was but I think a part had something like putting on the graph where alpha = vita. Again don't remember much but I hated that question, can't really remember the others so much.
It's been nearly a year and i still have absolutely no idea how to do question 9. It messed me up so badly. I still got an A in C2 but that question confused the hell out of me. I don't know where to start. I think the cost past threw me off.
I'm fine with C3 and C4 now but that C2 question brings back memories lol. How do you do it?
It's been nearly a year and i still have absolutely no idea how to do question 9. It messed me up so badly. I still got an A in C2 but that question confused the hell out of me. I don't know where to start. I think the cost past threw me off.
I'm fine with C3 and C4 now but that C2 question brings back memories lol. How do you do it?
Oh I see!
Vol = pi r^2 * h = 75pi
so r^2 * h = 75
So h = 75/r^2
Curved surface area = h * 2pi r = 75/r^2 * 2pi r = 150pi/r
If it costs 2 pounds per cm^2, then just multiply the curved surface area to get 300pi/r
For the top and bottom, it's just pi * r^2 * 3 (cost per cm^2) * 2 (you have a top and bottom)
so add these and voila
for part b it's just normal differentiating = 0 and solving for r. Then plug r in to the C equation
c) you double differentiate and plug your r value in to get a positive which means minimum
I did see an unusual amount of complaints last year, but I wasn't sure why. Maybe the question style.
Sucks for the people who learn just off past papers and don't actually take the time to understand it
There were a few questions that were more difficult/different than normal, such as a trig question requiring the use of quadratic formula etc that a lot of people didn't like
There were a few questions that were more difficult/different than normal, such as a trig question requiring the use of quadratic formula etc that a lot of people didn't like
There were a few questions that were more difficult/different than normal, such as a trig question requiring the use of quadratic formula etc that a lot of people didn't like
I thought this was practiced a lot in the textbook?