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What's a formula connecting force, density, area and speed
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Q17
Power = Energy / time.
Question 18, yes ? I solved it.What's a formula connecting force, density, area and speed
Q10
Q26
thank you sooo sooo much!Q10
kinetic energy remains conserved,
initial = final
since its a stationary body, initial kinetic energy = zero
if velocity of m is v, then velocity of 2m has to be such that sum of momentum remains zero.
therefore,
so velocity of 2m is -v/2 ( negative 'cause its in the opposite direction)
you can check, mv + (2m)(-v/2) = 0
now, [ 1/2(m)(v^2) ] / [ 1/2(2m)(-v/2)^2]
it becomes 2/1.
Q15
if the depths of water are equal by the end then the gain in height of water in the second tank should be h/2.
since the tanks are identical each tank would have equal volumes so the mass of water that has moved to the other tank should be m/2. since mass is directly proportional to volume provided density is constant. And density IS constant since its water.
Now PE=( m/2)(h/2)g
=mgh/4
Q18
pressure = hdg. But here h is 2h since on one side liquid rises by h and another side liquid falls by h.
if frequency is halved, the period is doubled as f=1/T
WELCOMEthank you sooo sooo much!
Phase diff of 1 wavelengeth is 2pi tht is 360 degree so x to y is 270 deg
The first curve is brittle, the second one isn't.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_12.pdf
In question 26, why is the answer D?
The breaking force isn't the same for both. There's a minor difference.
oh silly me thnksI did it like this, on the first sight
View attachment 44896
hnks0.7 m --------- 1.1 V So,
0.9 m ---------- ?
Cross multiply, you get V = 1.4
8: The velocity is constant for the first part and the second part but both are different. So acceleration is not constant. Also, there is no evidence that speed is zero at the start so B is wrong. Its not a straight line so distance is not proportional. Speed changes so D.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_12.pdf
Questions 8, 10, 23 and 28 please!
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