# General Thoughts: Physics (1 Viewer)

#### BillKyriakos

##### New Member
Oh, well I guess if we got the same answer then both ways are correct.

#### salcoo

##### New Member
Did anyone happen to get 7700 m/s for the velocity of the satellite ?

#### IamKirby

##### Member
Did anyone happen to get 7700 m/s for the velocity of the satellite ?
Yeah I read someone did but I fucked it up BECAUSE I DIDNT READ THE UNITS. Sorry just pissed at myself because it was the easiest question in the exam.

Sent from my iPhone using Tapatalk

#### Drsoccerball

##### Well-Known Member
did your line of best fit start from 0?
Yes it did because when the range is 0 the horizontal speed is 0.
Also we drew a line of best-fit for a reason, we have to use a point that lies on the line.
Also ill upload a sketch of what I did for the trolley/ cart question.

#### Drsoccerball

##### Well-Known Member
It doesn't asymptote to zero but rather to a speed since there was no friction ( Since velocity never changed without the magnet).

#### Shansss

##### New Member
whats that law of conservation of atar again

#### Drsoccerball

##### Well-Known Member
whats that law of conservation of atar again
Atar cannot be created nor destroyed but can be transformed. It usually transforms into something called a mystery mark

#### apurba

##### Member
how come velocity doesn't increase again haha this is probs stupid as but I drew an increase in velocity after it leaves the magnet because i thought the direction of eddy currents would change & so the trolley would experience a force in the opposite direction, causing its velocity to gain slightly.

where did i go wrong haha

#### apurba

##### Member
It doesn't decrease through B and C

If you measure the trolley with the A-B-C-D range you'll find both are exactly 3cm

It should start decreasing slightly before since the magnet isn't situated exactly at point B

and since the magnet will continue attracting after the front of the copper has slid through (i.e. the back of the copper bar) it should begin increasing just before D
yeah this is what i did

#### IamKirby

##### Member
wtf how many changes in the paper did the examiner make. literally like 2 in MC and 1 in shorts.
What do you mean?

Sent from my iPhone using Tapatalk

#### IamKirby

##### Member
yeah this is what i did
I don't understand at all how velocity will increase. Where is the energy for the increase coming from?

Sent from my iPhone using Tapatalk

Bombed out lel
Hubris plz

#### PhysicsMaths

##### Active Member
I don't understand at all how velocity will increase. Where is the energy for the increase coming from?

Sent from my iPhone using Tapatalk
Nowhere. They have violated the law of conservation of energy / momentum.

#### IamKirby

##### Member
Nowhere. They have violated the law of conservation of energy / momentum.
Okay haha thought so, thanks

Sent from my iPhone using Tapatalk

#### Vizsla

##### Member
Shouldnt it have a horizontal point of inflexion somewhere, as when the copper plate is directly below the magnet, it experiences a constant flux, thus no change according to Lenz's law?

#### Drsoccerball

##### Well-Known Member
Shouldnt it have a horizontal point of inflexion somewhere, as when the copper plate is directly below the magnet, it experiences a constant flux, thus no change according to Lenz's law?
But theres still a change in flux ?

#### Vizsla

##### Member
But theres still a change in flux ?
At the point where its directly under? So like the same situation of when you have something moving within a field, and when its completely immersed, has no induced current.

#### Mr_Kap

##### Well-Known Member
Band 6 cutoff around 78-82???

#### Drsoccerball

##### Well-Known Member
At the point where its directly under? So like the same situation of when you have something moving within a field, and when its completely immersed, has no induced current.
Lets just say the magnetic field at 0.0001 meters away from the middle is X and right under is Y. Change in flux = X-Y and thus since they're not equal there has to be a change in flux? no?