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density = mass/volumeHow is the real value 5?
density = 50 / 10
density = 5.0
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density = mass/volumeHow is the real value 5?
thnx mateB. Consider the momentum of the sand+car as a whole. Also, consider Newton's first law with regard to the car. There's no accelerating force acting on the car at Y so it can not gain speed.
You're misreading the question.And finally, 20. Now this has to be the toughest question in the whole paper; I still haven't actually figured it out. But from what I understand; the boy applies a pressure which is a tenth of the atmospheric pressure atop the straw.
Which means that p0/10 is the pressure applied.
You're misreading the question.
The question says:
"[...]the child is capable of lowering the pressure at the top of the straw by 10%. [...]"
This means that the pressure on top is 0.9p₀.
What's the argument now?
Saad (سعد) Jaf this question...argh! the question says the child is capable of reducing the pressure at the top by 10% so the pressure at the top is now 0.9Po and it gives you the right answer when you substitute it into P=pgh! but why does the examiner report say so! is it cuz there asking about the maximum length, so it means that the lowest possible pressure is to be used, which is 0.9 Po cuz the child cant reduce it more, and hence the answer is B.
Read my reply above. I'm pretty sure that's how it works... and Allah knows best.
3. Intensity = energy/(area * time) (also given in the question)
37. The easiest way to solve these questions is by using some fake values of “I” entering the parallel junction. You know that the current is divided into the inverse proportional of the resistances in parallel, so that means if say, you have 6 A entering the junction, 4 A would go the 2 Ohm resistor and 2 A to the 6 Ohm resistor in the 1st parallel combination (lets call this “block 1”).
In “block 2”, 6 A is also entering the junction, and 3 A is shared equally between the resistors. I1 is 4 A and I2 is 2 A, and I1 > I2. Since you also have the currents entering the resistors, you can easily find out the values of V too and compare them.
is the answer B..i got 8.66..is it correct
OK, see this diagram:Thanks alot
explanation needed for this one
OK, see this diagram:
I have used a fake value of 6A (you can use anything) entering each junction (they have to be the same at each junction of course). In parallel, the currents are divided into the inverse proportionals of the resistors. I have named each resistor "A", "B", "C" and "D". In block A, the total resistance is 6+3 = 9 Ohms. A will get (6/9) * 6 = 4A for example. I did the calculations for the rest of the resistors, too. To find the voltage, of the resistors, just use the formula V = IR (I being the current entering each resistor).
I hope this helped.
the answer is B coz their is a trough before point P so as the wave propagates point P will move downward..9702_s04_qp_1.pdfquestion 25. I don't know if this question has been discussed before coz the thread is too long to search. Can you kindly help. Any help will be greatly appreciated. Thanks in advance
my bad...........had to be A.........the answer is B coz their is a trough before point P so as the wave propagates point P will move downward..
for Q as it is at its maximum point it will be stationary.......
the pressure can be 0.9Po on the top, without the water spurting out...it just means that the straw is really long!
so you mean to say the answer is supposed to be A...
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