Physics /12 Discussion!

[killer22]

Assalaamu Alaikum guys,

So the 24 hours waiting time is finished. Let's start the discussion!

What was the answer to Q3? That circle one with forces....
And what about Q9? That air hitting the wall one - could anyone do it?
Was the bow and arrow one 19m?
What about the heights of the mercury columns? Was it 4 - 2?

 

[Obsidian Fl1ght]

Assalaamu Alaikum guys,

So the 24 hours waiting time is finished. Let's start the discussion!

What was the answer to Q3? That circle one with forces....
And what about Q9? That air hitting the wall one - could anyone do it?
Was the bow and arrow one 19m?
What about the heights of the mercury columns? Was it 4 - 2?

The circle one... I chose C.
Yeah I know that isn't helpful but I remember the angle of Resultnt Vector was approximately 45 degrees (To the components ie)

Uhhh yeah.
That one.
It was mental is all.
Randomly-choose-nd-fill-in-the-box is the highly useful strategy I applied for that one.
I chose 480N.

Btw, if anyone remmbrs the values given - density of air, area and speed change, tell me.

Dunno abt the arrow-bow one.
Yeah - I distinctly remmbr not choosing 4 - 2.

What abt other questions?
For instance the question regarding the ball thrown upwards. (AR neglected).
Anyone remmbrs their answer?

Three of the options, as far as I remmbr, were:

Momentum of ball conserved.
Energies of ball conserved.
PE changes proportionately with time. (Something like that - but u get the deal.)

What was ur pick?

 

[killer22]

I chose total energy of the ball conserved.

 

[h4rriet]

The circle one... I chose C.
Yeah I know that isn't helpful but I remember the angle of Resultnt Vector was approximately 45 degrees (To the components ie)

Uhhh yeah.
That one.
It was mental is all.
Randomly-choose-nd-fill-in-the-box is the highly useful strategy I applied for that one.
I chose 480N.

Btw, if anyone remmbrs the values given - density of air, area and speed change, tell me.

Dunno abt the arrow-bow one.
Yeah - I distinctly remmbr not choosing 4 - 2.

What abt other questions?
For instance the question regarding the ball thrown upwards. (AR neglected).
Anyone remmbrs their answer?

Three of the options, as far as I remmbr, were:

Momentum of ball conserved.
Energies of ball conserved.
PE changes proportionately with time. (Something like that - but u get the deal.)

What was ur pick?

I chose total energy of the ball is conserved. What about the resultant forces question (number 3)? Did the 5 N go through the centre of gravity?

 

[A star]

i chose speed :/

 

[Obsidian Fl1ght]

I chose total energy of the ball conserved.

I chose total energy of the ball is conserved. What about the resultant forces question (number 3)? Did the 5 N go through the centre of gravity?

Uhhh... why do I get the sinister feeling that I'm the only one who chose the PE option?
Hn.

Q3: I extended the line of actions of the two forces, so yeah. 5N went thru centre of gravity.
And u?

 

[h4rriet]

How about these questions:

• The SI unit of resistivity.
• The graph of the voltage across 2 resistors in series (one was a variable resistor and the other a normal resistor).
• The perfectly elastic collision question.

 

[h4rriet]

Uhhh... why do I get the sinister feeling that I'm the only one who chose the PE option?
Hn.

Q3: I extended the line of actions of the two forces, so yeah. 5N went thru centre of gravity.
And u?

But the PE doesn't increase proportionally with height. That was the option, unless I remember incorrectly?
And yes, I chose the option with the 5 N through the centre of gravity too.

 

[killer22]

How about these questions:

• The SI unit of resistivity.
• The graph of the voltage across 2 resistors in series (one was a variable resistor and the other a normal resistor).
• The perfectly elastic collision question.

Graph of the resistors, Answer: D
Elastic collision, I chose speed unchanged

 

[Obsidian Fl1ght]

i chose speed :/

I'd like to know what logic u applied for this choice...
Coz albeit I agree with the energy conservation bit... should not the energy of the whole system be being conserved?
Not of the ball only?

Ah well. I may be wrong.
But is there anyone out there to prove so?
(No. This is not a challenge... more like a friendly bring-me-down challenge. Even educational perhaps.

 

[A star]

I'd like to know what logic u applied for this choice...
Coz albeit I agree with the energy conservation bit... should not the energy of the whole system be being conserved?
Not of the ball only?

Ah well. I may be wrong.
But is there anyone out there to prove so?
(No. This is not a challenge... more like a friendly bring-me-down challenge. Even educational perhaps.

idk the answer i think momentum should be conserved cause
deltap/t=F
0=deltap/t hence deltap=0 i got this one minute after the paper -_-

 

[A star]

How about these questions:

• The SI unit of resistivity.
• The graph of the voltage across 2 resistors in series (one was a variable resistor and the other a normal resistor).
• The perfectly elastic collision question.

unit wala was B i think

 

[1ajia1]

I'd like to know what logic u applied for this choice...
Coz albeit I agree with the energy conservation bit... should not the energy of the whole system be being conserved?
Not of the ball only?

Ah well. I may be wrong.
But is there anyone out there to prove so?
(No. This is not a challenge... more like a friendly bring-me-down challenge. Even educational perhaps.

The ball question was repeated and it said that neglecting air resistance so yeah the energy remains constant.

 

[saadgujjar]

what was answer of H1 and H2 question of pressure

 

[Malik777]

The circle one... I chose C.
Yeah I know that isn't helpful but I remember the angle of Resultnt Vector was approximately 45 degrees (To the components ie)

Uhhh yeah.
That one.
It was mental is all.
Randomly-choose-nd-fill-in-the-box is the highly useful strategy I applied for that one.
I chose 480N.

Btw, if anyone remmbrs the values given - density of air, area and speed change, tell me.

Dunno abt the arrow-bow one.
Yeah - I distinctly remmbr not choosing 4 - 2.

What abt other questions?
For instance the question regarding the ball thrown upwards. (AR neglected).
Anyone remmbrs their answer?

Three of the options, as far as I remmbr, were:

Momentum of ball conserved.
Energies of ball conserved.
PE changes proportionately with time. (Something like that - but u get the deal.)

What was ur pick?

It was Potential energy I think I had done it before#repeat

 

[1ajia1]

It was Potential energy I think I had done it before#repeat

potential energy does not increase proportionally with time during ascent.. thats wrong!

 

[Malik777]

The ball question was repeated and it said that neglecting air resistance so yeah the energy remains constant.

Wasnt that Potential energy per unit time Remains constant? :/

 

[1ajia1]

Wasnt that Potential energy per unit time Remains constant? :/

No it was potential energy increases proportionally during ascent.

 

[prettypearlshy]

idk the answer i think momentum should be conserved cause
deltap/t=F
0=deltap/t hence deltap=0 i got this one minute after the paper -_-

yeah even i chose that,momentum should be conserved...but still it was kinda confusing

 

[A star]

yeah even i chose that,momentum should be conserved...but still it was kinda confusing

happens well i still managed to get less then 5 wrong till now :/