Nicke011 wrote: » Lovely paper, it went unexpectedly good Expecting a high B The marking scheme is probably going to be very hard, Q2 1.47 Q5 U-value, go construction studies! Q6 12. something (about 13 as far as I remember); Let's go applied maths! Q8 Engineering all the way! 238/92U + 1/0n = 239/95Pu + 2*(0/-1e) Q12 b) V=-4.28cm c) T=15.68 degrees
Daithi MacG wrote: » Q.2 was the refractive index I thought? That's Q.4 you're thinking of, is it? For that I added the initial temperature, because my graph was I^2 against change in temp.
aleatorio wrote: » No I mean in Q12 with the icecubes :P
Daithi MacG wrote: » Q.5 I do construction too, but wasn't 100% sure of it :P was it U-value x area x temp difference? Q.6 I got 13.something I think Q.12 I got V=-6 exactly 6 though so maybe I'm wrong. And for the Temperature...or the "Temperture" as was the correction...I got 16.something Anyway, the method is where it's all happening :cool:
Nicke011 wrote: » Yeah, for Q5 it's 75.6... (2.8*3*9) Q6 it's 12 or 13 I can't remember exactly For Q12 I wrote down -4.28cm so it's either me or you someones wrong
Daithi MacG wrote: » For Q12, did you say that F=5, U=30 and use: 1/u - 1/v = 1/f ?
Nicke011 wrote: » Yeah d=20, so r=10, so f=5 U=30 And because its convex both v and f are negative (use 1/-5 for 1/f), and you'll get negative v
jimbob95 wrote: » how did people go about answering the last part of q2?
Daithi MacG wrote: » I said if there is an error in the data, the line of best fit won't be affected as much as the average value. Didn't know what else to say, think I scribbled something down at the end but it's all just a blur...just hoping I get some marks for that anyway.
marno21 wrote: » For q5, the way it said an hour, did you not have to multiply your U value by 3600?
FatRat wrote: » Q1, two forces that need watching out for? I said friction and gravity. As in to solve friction, clean the air track and to solve gravity.. Keep it exactly level? Q3, speed was like 389? And the last part she took the difference in length between both resonances and she had half a wavelength then. And use the formula to find the speed with the wavelength? Q7, sensors were located in the retina, right? Q10, speed of ambulance was 1.1 ms??
FatRat wrote: » 29m/s is very quick though, isn't it? Sounds right actually.
aleatorio wrote: » Ok so I scribbled down a majority of my calculations answers: Q2: n=1.175 Q3: v= 339 Q4: Temp = 25.5 Q5: (b) 6.563 x 10^23 (d) 75.6J (h) 2.1627 x 10^-19 Q7: Energy of photon = 2.8036 x 10^-19 Number of lines = 400 Q8: 7.628 x 10^24 nuclei Q9: Charge = 3.6 x 10^-5C Energy = 2.16 x 10^-4 New capacitance: 4 x 10^-6F Q10: speed = 29.025 Resistance = 17.36 ohms Q11: Frequency = 2.4177 x 10^14Hz Decay constant = 5.77622 x 10^-4 Q12: (A) Length = 4.13cm Period = 0.2565s (C) Mass = 0.014375kg Temp = 21.45 (these are wrong, just realized I only did it for 1 ice cube )
jimbob95 wrote: » differences between a capacitor and a battery anyone? i said a capacitor can be recharged while a primary battery cant?
Huell wrote: » for 11 you have to divide the frequency by 2 as two photons are produced. I share 90% of your answers you have there
Daithi MacG wrote: » Q.10, I definitely got higher than that for the speed, something like 28/29m/s...good chance I'm wrong I'd say.
JackH14 wrote: » For the frequency question in Q11 I got 1.2356 x 10^20 Hz. Did anyone else get that?
jimbob95 wrote: » would the fact that capacitance is measured in farads and a battery in volts be valid haha :P
Nicke011 wrote: » Lovely paper, it went unexpectedly good Hoping for a A2/B1/B2 The marking scheme is probably going to be very rough Q2 1.47Q4 26Q5 U-value, go construction studies! Q6 Net force = 0, golfer is not moving; Max height 12. something (about 13 as far as I remember); Let's go applied maths!Q8 Engineering all the way! 238/92U + 1/0n = 239/95Pu + 2*(0/-1e)Q12 b) V=-4.28cm c) T=15.68 degrees
