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how did you people even think of voltages and currents for a mechanics question?!I did something similar. I varied the voltage and the speed of fan was proportional to the voltage.
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how did you people even think of voltages and currents for a mechanics question?!I did something similar. I varied the voltage and the speed of fan was proportional to the voltage.
but if you're using a fan with different speeds.. then why would you calculate the speed of the ballooon? why did every body mix this.. v was the inedependant variable .. you werent gonna go calculating it, you'd give it a certain speed every timewhat did u write in additional details?
my answers are almost identical to yours. .My answers:
Gradient: 142 +- 8
2nd ques: 3.72x10^-4 ---- units: N/Hz^2 m^2
3rd ques: 21.3%
4th ques: forgot
5th ques: 10.7%
Your 3rd ques value should be halved to get the 5th ques value
can we get ecf for 5th ques if we have halved the wrong percentage uncertainity of 2nd ques.? & i forgot to write the unit, it would deduct a mark then?My answers:
Gradient: 142 +- 8
2nd ques: 3.72x10^-4 ---- units: N/Hz^2 m^2
3rd ques: 21.3%
4th ques: forgot
5th ques: 10.7%
Your 3rd ques value should be halved to get the 5th ques value
my answers are almost identical to yours. .
Yeah mine too and so were my friends so something around those answers must be correct.my answers are almost identical to yours. .
I'm sure they'd give you the mark. And, for missing the units, you will only get 1 out 2 marks, provided your answer is correct.can we get ecf for 5th ques if we have halved the wrong percentage uncertainity of 2nd ques.? & i forgot to write the unit, it would deduct a mark then?
btw the unit I wrote was Ncan we get ecf for 5th ques if we have halved the wrong percentage uncertainity of 2nd ques.? & i forgot to write the unit, it would deduct a mark then?
You guyz are thinking too much...Lol. You guys are such geniuses, and the examiner would surely love to read your scripts!
For the first question, I placed a fan at a certain distance from the rope of the balloon and directed the face into an air chamber which would open at the balloon. The distance of the air chamber could be measured using two metre rules while the time taken for the wind to travel through the air chamber could be calculated with the help of a stopwatch. Speed is known using v=s/t. The fan is placed at different distances, and so the speed changes accordingly.
The mouth of the air chamber should be large enough to cover the whole of the fan so all of the wind goes straight to the balloon and the experiment is performed in a room where the fan is the only wind source.
For the safety precautions, I wrote care should be taken to not fill too much helium gas in the balloon as it might burst and the rope be tied securely to the slab in the laboratory so the helium-filled balloon does not rise up in the air.
There were some conceptual mistakes with this experiment, but it was the best I could think of really. Yeah, you can thank me later.
kg m^-1I wrote N Hz^-2 m^-2 or something like that...
not even...explainkg m^-1
I guess many people who haven't done their 52 really benefited from our posts
And where the hell are the admins?
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