Physics: Post your doubts here!

[bamteck]

Please help me for June 2004 p2 no. 3 (b)(ii)
Thanks.

wa iyyakum..
no air resistance means nothing stopping it from comming down so constant acceleration.. that tells us speed keeps increasing at a fixed rate (Acceleration of 9.8) until SPLAT it hits the ground.... with air resistance the speed increases till a fixed value and until that time air resistance force also increases until the upward and downward forces are equal and your drop comes down with a constant velocity.. we call that const velocit Terminal Velocity if my memory servers me right...

 

[Albert Einstein]

could you help me with June 2012 P12 Q13?

U must have done these type of quest in mechanics.. u r frm mru i fink??

well
its simple simultaneous enqs

Using newton(my friend) laws of motion
2g - T = 2a eqn 1

T - 6 = 8a eqn 2


U solve simultaneously u'll get a = 1.4 ms^-2

T =17.2 N

hence a=1.4 ans is option A

 

[Albert Einstein]

Mustehssun Iqbal or Albert Einstein or someone else Please help me for this question.
Please help me for June 2004 p2 no. 3 (b)(ii) also. I have trouble in answering.
Thank you very much in anticipation.View attachment 14708

Here u are basic o levels...

 

[bamteck]

Here u are basic o levels...

Please help me for June 2004 p2 no. 3 (b)(ii) too.
Thank you very much. I'm from MRU too

 

[bamteck]

simple use s = ut = 1/2at^2

find a

Note u for values s and t u should choose with the largest one or u find an average of d and t before replacing

Its not clear for me

 

[Albert Einstein]

Please help me for June 2004 p2 no. 3 (b)(ii) too.
Thank you very much. I'm from MRU too

Here u r.....
i've made it simpler as possible if still u can't then i can't do otherwise

 

[bamteck]

Here u r.....
i've made it simpler as possible if still u can't then i can't do otherwise

Thank you very much mate ! Now, I got it.

 

[Varuna0911]

U must have done these type of quest in mechanics.. u r frm mru i fink??

well
its simple simultaneous enqs

Using newton(my friend) laws of motion
2g - T = 2a eqn 1

T - 6 = 8a eqn 2


U solve simultaneously u'll get a = 1.4 ms^-2

T =17.2 N

hence a=1.4 ans is option A

thanks a lot..yess I am

 

[yumichikabyakuya renji]

hey
someone has the mark scheme of nov 02 p1??

 

[asangietalks]

can someone help do question 6c? http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_22.pdf
thanks.

 

[Haseefa]

How do I do this?

When a golfer hits a ball, his club in in contact with the ball for about 0.0005s and the ball leaves the club with a speed of 70m/s. The mass of the ball is 46g.

a) Determine the mean accelerating force.
b) What mass, resting on the ball would exert the same force as in a?

 

[FeLiX zoe]

Does anyone have any simple notes on Atomic Physics ???

 

[nightrider1993]

can someone help do question 6c? http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_22.pdf
thanks.

I hope this anwsers ur question

 

[nightrider1993]

How do I do this?

When a golfer hits a ball, his club in in contact with the ball for about 0.0005s and the ball leaves the club with a speed of 70m/s. The mass of the ball is 46g.

a) Determine the mean accelerating force.
b) What mass, resting on the ball would exert the same force as in a?

Answers
a) Impulse = (force)(change in time) = momentum
therefore,
Force= (0.046*70)/(0.0005) = 6440N

b) i dont understand the question

 

[nightrider1993]

hey
someone has the mark scheme of nov 02 p1??

The answers for MCQ are in this examiner report

 

[nightrider1993]

Answers
a) Impulse = (force)(change in time) = momentum
therefore,
Force= (0.046*70)/(0.0005) = 6440N

b) i dont understand the question

Do you know the answer to part b?

 

[nightrider1993]

How do I do this?

When a golfer hits a ball, his club in in contact with the ball for about 0.0005s and the ball leaves the club with a speed of 70m/s. The mass of the ball is 46g.

a) Determine the mean accelerating force.
b) What mass, resting on the ball would exert the same force as in a?

Do you know the answer to part b?

 

[Haseefa]

Do you know the answer to part b?

a)(70-0)/0.0005 = 140,000

F=ma
= 0.046 x 140,000
= 6440 N


b) F=ma
6440= mx 9.81
m = 656.47 kg

answer provided by badrobot14

 

[asangietalks]

I hope this anwsers ur question

thank you so muchh,,,, now i get it.. thankss....

 

[Haseefa]

When jumping from a wall onto the ground, it is advisable to bend one's knees on landing. Using Newton's second law of motion, explain why it is sensible to bend one's knees..?

smzimran Could you help me here?