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Physics: Post your doubts here!

ZaqZainab

ZaqZainab

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crazytaylorfanXD said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf

Qs 5 , 6, 12 (why not D) , 16 , 23 , 28 , 22(why not c)

please helpp :/
Click to expand...
Q5 B as d has a square and when we write the percentage uncertinty
we will write it as 2(uncertinity of d)/d *100

Q6 the time for it to move from X to Y will be less than time for Y to Z
so B and C are wrong
the acceleration from X to Y is NOT equat to Y to Z and so D is wrong

Q12 why not D cause when the ice-hockey puck moves back it havs a negative velocity and forward was positive and so momentum=m*v will be negative

Q16 it is inelastic collision because they travel together
Ek=0.5mv^2
after collision the mass will be doubled
0.5*2*mv^2 =mv^2
so mv^2=0.5mv^2/2=Ek/2
 
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..sacrifice4Revenge..

..sacrifice4Revenge..

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Thought blocker

Thought blocker

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..sacrifice4Revenge.. said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_12.pdf
Click to expand...
5)
time for 8.5 cycles is 6 x time base setting i.e. 6x(0.01) = 0.06
time period = 0.06/8.5
frequency will be 1/Ans
its close to 140

15)
Efficency=Useful Output energy/Input Energy multiplied by 100
Now Input energy=Force*Distance=Fs
For output energy if u read the question carefully the car is moving with constant speed v so it is not gaining kinetic energy.It is only gaining Potential energy.Now u have to calculate height.Whenever u need to calculate h and distance of slope and angle of slope with horizontal is given,use the formula
sin alpha=h/s so h=s sin alpha
Gain in P.E=m*g*s sinalpha
m*g*s sinalpha divided by Fs giving u D as answer
 
crazytaylorfanXD

crazytaylorfanXD

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ZaqZainab said:
Q5 B as d has a square and when we write the percentage uncertinty
we will write it as 2(uncertinity of d)/d *100

Q6 the time for it to move from X to Y will be less than time for Y to Z
so B and C are wrong
the acceleration from X to Y is NOT equat to Y to Z and so D is wrong

Q12 why not D cause when the ice-hockey puck moves back it havs a negative velocity and forward was positive and so momentum=m*v will be negative

Q16 it is inelastic collision because they travel together
Ek=0.5mv^2
after collision the mass will be doubled
0.5*2*mv^2 =mv^2
so mv^2=0.5mv^2/2=Ek/2
Click to expand...
thank you soo much :)
 
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