Physics: Post your doubts here!

[ParulS]

June 2003
Q 30

Can someone solve it and explain also

Thanks in advance

 

[umair1161]

What you don't get in this ?

I did the question... and i got the answer as C .....but the answer is D even though the ball had been thrown towards the left!

 

[ashcull14]

June 2003
Q 30

Can someone solve it and explain also

Thanks in advance

1 mA = charge flow of 1mC per sec

Av current = ½(100+ 20) mA = 60 mA = 60 mC/s

Net charge = 60 mC/s x 8.0s .. .. ►q = 480 mC

 

[omeraz]

is it

B?

Yesss, how?

 

[MaboroshI_I]

A few more questions, if somebody could please help me out.

 

[Shaoli Hassan]

[quote="

Please solve View attachment 45275[/quote]
The answer is B.

the edge of the circular scale is somewhere after 3.5 mm. The datum line coincides with 31 on the circular scale.
So, diameter= 3.5+(31*0.01)
=3.81 mm

So, area = (pi)(3.81)(0.25)
=11.4

 

[ashcull14]

 

[ashcull14]

Yesss, how?

area of model=1/10 area of full size ...stress=F/A....S1A1=S2A2...solve it u get the ans

 

[Shaoli Hassan]

A student uses a digital ammeter to measure a current. The reading of the ammeter is found to
fluctuate between 1.98 A and 2.02 A.

The manufacturer of the ammeter states that any reading has a systematic uncertainty of ± 1 %.

Which value of current should be quoted by the student?
A (2.00 ± 0.01) A
B (2.00 ± 0.02) A
C (2.00 ± 0.03) A
D (2.00 ± 0.04) A

How is the answer D?

The readings fluctuate and the uncertainty is 1%. So, the lowest value should be (1.98-(1.98*1%))=1.96. The highest value should be (2.02+(2.02*1%))=2.04. So the current value should be quoted as in D.

 

[ashcull14]

A few more questions, if somebody could please help]
Q24..F=kx...e=1/k...therefore,
A=greater e as more layers reduce the value of k
B=more springs per unit area increase the value of k hence dsnt hve adesired effect.......

 

[Thought blocker]

Gotta go!!! Sorry... I can't help now... coz I dont wanna study now ._.

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

 

[Batguy]

please :'(

PLEASE DO IT :/

 

[ashcull14]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

Q15=a is always in the direction of the resultant force...eg if the resistive force is greater than the velocity the object will decelerate..which means the direction of a is opposite to the direction of velocity

 

[_Ahmad]

Q15=a is always in the direction of the resultant force...eg if the resistive force is greater than the velocity the object will decelerate..which means the direction of a is opposite to the direction of velocity

sorry
but can you give another eg please.

 

[ashcull14]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

Q16= W is a single component..while H has 2 components horizontl and vert..so greater mag....T is the greatest as it has balanced W nd H both

 

[ashcull14]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

Q16= W is a single component..while H has 2 components horizontl and vert..so greater mag....T is the greatest as it has balanced W nd H both

 

[Thought blocker]

Ok I'll come late over here

 

[ashcull14]

sorry
but can you give another eg please.

e.g parachute falling in the air...it initially accelerates because of Weight>air resistance....as air resistance increases its speed begins to decrease...nd as air resistance>weight...the resultant force is in the direction of air resistance so the object accelerates no more and decelerates....the direction of acceleration becomes negative...opposite to the direction of velocity...(resultant force and acceleration in the same direction)

 

[NamelessIguana]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_12.pdf
23, 20 pl0x m8.