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ALL CIE PHYSICS DOUBTS HERE !!!

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Deadly_king:

--- Quote from: TJ-56 on November 14, 2010, 09:15:02 am ---Can anyone help me with those pls  ???

--- End quote ---

Nov 05 No 34

Use the formula V = IR. Make R the subject of formula ---> R = V/I

Hence smallest resistance will result when V is minimum while I is maximum.

Therefore answer is C

Jun 04 No 25

At the instant the point Q is at a maximum which means it is temporarily stationary and it is neither moving upwards nor downwards.

At the same instant the point P is a zero displacement but is moving downwards since it was previously at Q and is moving downwards upto the minimum. ;)

Answer is A

Jun 03 No 20

Decreasing pressure by 10% ----> New pressure 0.1Po

Hence 0.1Po = hg

H becomes 0.1Po/g which is equal to Po/10g

Answer is A

Hope it helps :)

TJ-56:

--- Quote from: Deadly_king on November 14, 2010, 09:47:58 am ---Nov 05 No 34

Use the formula V = IR. Make R the subject of formula ---> R = V/I

Hence smallest resistance will result when V is minimum while I is maximum.

Therefore answer is C

Jun 04 No 25

At the instant the point Q is at a maximum which means it is temporarily stationary and it is neither moving upwards nor downwards.

At the same instant the point P is a zero displacement but is moving downwards since it was previously at Q and is moving downwards upto the minimum. ;)

Answer is A

Jun 03 No 20

Decreasing pressure by 10% ----> New pressure 0.1Po

Hence 0.1Po = hg

H becomes 0.1Po/g which is equal to Po/10g

Answer is A

Hope it helps :)

--- End quote ---

Thank you so much +rep
Just a question though

Jun 03 No 20
The child reduced p0 BY 10% and not TO 10%, isnt it supposed to be 0.9p0 rather than 0.1p0 , he reduced it BY 10%, so 90% is the new percentage, i understood this question once, but now it seems real confusing

and q34
Resistance = v/I
which is 1/gradient
So the greater the gradient, the lower the resistance, at B the gradient is greater than at C, so why cant B be the correct response?
Sorry for the questions, but i just need to get those clarified,
thank you

Dania:
Why is the answer B?

$!$RatJumper$!$:
W07 Q 3, 6, 16, 22, 25, 37 :) thank you

$!$RatJumper$!$:

--- Quote from: Dania on November 14, 2010, 10:14:04 am ---Why is the answer B?

--- End quote ---

Momentum before = Momentum after

Momentum before: (1000 + 10) * 0 = 0    ---> There was no initial velocity thus * 0

Momentum after: (1000 * 5) + (-10 * v) = 0    ---> Cannon ball moving in opposite direction so since it is velecity we need to specify its direction

Thus v = 500 ms-1

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