Physics Paper-21 !!

[Maayee]

Strain energy was around 0.03 or 0.04, didn't remember properly

Spring constant was 250 Nm-1

yeah i got 250 and i think the strain energy was around that...thank u

 

[qwertypoiu]

the acceleration was for the rebound when the ball was moving up right?

Yep

 

[slisjunknown]

My paper was kind of bad....I swear I thought the timing was 1hr and 15 min...and I was going so cooly and the inviligilator goes like fifteen minutes when I've got two questions remaining....
Didn't like the kinematics question at all.......

 

[omar_darwish]

The answers I remember are:
Q1:
kgm^2s^-3
kgm^2s^-3A^-1
Q2:
acceleration: 9.77777 ms^-2
Distance = 10.4m
Displacement = 2.0m
graph just invert what's below to above
Q3:
75g
inelastic

I've forgotten the questions already...


Last question the ratio was 2

Are you sure it was 75 grams? and why is it inelastic?

 

[qwertypoiu]

Are you sure it was 75 grams? and why is it inelastic?

Pretty sure 75g.
Nearly everyone got that.
Two reasons why a collision may be inelastic:
1. Total kinetic energy was not conserved...
2. Relative velocity of approach and separation were not equal.

I checked both of these. Both these conditions were satisfied.

 

[janasalem]

are you sure the distance is 10.4 ?

 

[qwertypoiu]

are you sure the distance is 10.4 ?

I remember it was around 10.4 but I've forgotten the exact numbers from the graph so I have no way to verify.

 

[sdsdwwwwwwwwwwwwwww]

yeah i got 250 and i think the strain energy was around that...thank u

I got 200 for spring consant, the graph didnt satrt at zero right? How did you get taht for sprong constant?

 

[Solostar]

I got 200 for spring consant, the graph didnt satrt at zero right? How did you get taht for sprong constant?

Graph needn't to start from origin as long as the material is obeying hooke's law you can find from any where. It's recommended that you must use 3/4 size of graph to determine the gradient

 

[Solostar]

Pretty sure 75g.
Nearly everyone got that.
Two reasons why a collision may be inelastic:
1. Total kinetic energy was not conserved...
2. Relative velocity of approach and separation were not equal.

I checked both of these. Both these conditions were satisfied.

Same

 

[manya]

does anyone remember strain energy exactly cuz i remember getting 0.021J

 

[ryanfarooqi]

Can anyone rephrase the velocity for momentum for both objects before and after were they in negative or postive

 

[janasalem]

how did you get the strain energy ?
was the question change in strain energy ?

 

[THARINDU AWESOME]

paper 22 was easy.and by the way anyone who did maths this time the papers are out all ready+marking schemes

 

[THARINDU AWESOME]

ha

U didn't need to know the SI base unit of ohm u should have used the formula P=VI to get the base unit of V

haha

 

[janasalem]

can anyone post the electricity answers ?

 

[THARINDU AWESOME]

check slide share .com website

 

[qwertypoiu]

can anyone post the electricity answers ?

Could you remind us the questions?

 

[THARINDU AWESOME]

do u want mcq questions???????

 

[ryanfarooqi]

URGENT PLEASE REPLY WAS THERE ANY MOMENTUM TORQUE QUESTION IN THE PAPER 21!!!!!!!!!!!!