how was physics unit 5

[aligatorviper]

i wonder why no thread is made yet for this....
so how was it???
i feel it was easy but i made blunders. i think the grade boundary is gonna be very high for this.

 

[tawsif kaium]

same to me...i think so it will be more than 63+.....it was pretty easy paper...

 

[aligatorviper]

same to me...i think so it will be more than 63+.....it was pretty easy paper...

for an A or A*???

 

[saifulahmed49]

i think 68-70 for an A*

 

[aligatorviper]

i think 68-70 for an A*

hmmmm
hope its lower than this.
ok tell me whose velocity did we have to find in the last question...was it polonium or lead???i was short of tym n didnt read the question carefully n even dont remmber what i did???

 

[saifulahmed49]

hmmmm
hope its lower than this.
ok tell me whose velocity did we have to find in the last question...was it polonium or lead???i was short of tym n didnt read the question carefully n even dont remmber what i did???

lead....there is no polonium after it decays.

 

[shahlakh]

It was an awesome paper

 

[duck1300]

good paper, not the easiest though. But the questions which was the circle and you had to draw the gravitational field around it was it 2 or three marks , i zoned out and didn't realize all i had to do was the 4+ equidistant lines... that was like the easiest questions as well -.-

 

[aligatorviper]

good paper, not the easiest though. But the questions which was the circle and you had to draw the gravitational field around it was it 2 or three marks , i zoned out and didn't realize all i had to do was the 4+ equidistant lines... that was like the easiest questions as well -.-

2 mrks i guess..
dont worry hear about my blunder""""i used the mass of polonium instead of lead to find the velocity of lead n this also affected my subsequent answers
by the way what was ur ans to the shm mcq???

 

[Agent Z]

The calculations were like freshly made cheesecake. The theory questions is where I guess people will lose marks.

 

[duck1300]

2 mrks i guess..
dont worry hear about my blunder""""i used the mass of polonium instead of lead to find the velocity of lead n this also affected my subsequent answers
by the way what was ur ans to the shm mcq???

All energies, A. Guessed it tho, because i know total energy is conserved in shm, so i'm not really sure tbh just hope i get a high A to even out my unit 4 and 6 and hopefully unit 1 resit i go up as well just want a B overall since an A is nearly impossible since i was barely over an B in as

 

[saifulahmed49]

All energies, A. Guessed it tho, because i know total energy is conserved in shm, so i'm not really sure tbh just hope i get a high A to even out my unit 4 and 6 and hopefully unit 1 resit i go up as well just want a B overall since an A is nearly impossible since i was barely over an B in as

it's D, none of above. potential energy and kinetic energy never remain constant!as P.E increases K.E. decreases and vice versa..

 

[aniekan]

it's D, none of above. potential energy and kinetic energy never remain constant!as P.E increases K.E. decreases and vice versa..

No! Total energy remain constant therefore your answer is wrong

 

[saifulahmed49]

No! Total energy remain constant therefore your answer is wrong

dude there was no option only for total energy, so it should be D!

 

[aniekan]

dude there was no option only for total energy, so it should be D!

I know that but why is it D?
You had 1- total energy 2- K.E and 3- P.E . Why pick none? When you know that in SHM. Total energy is conserved (remain constant), although P.E and K.E is changing.(change in K.e = change in P.e)

The only valid answer was all energy.

 

[tawsif kaium]

I know that but why is it D?
You had 1- total energy 2- K.E and 3- P.E . Why pick none? When you know that in SHM. Total energy is conserved (remain constant), although P.E and K.E is changing.(change in K.e = change in P.e)

The only valid answer was all energy.

its not because there is was total energy too...so i think its A

 

[aniekan]

its not because there is was total energy too...so i think its A

That's what I picked.

 

[CyanLite]

The correct answer was D. Total energy is only conserved in free oscillations. In forced systems, the dampers dissipate energy which means the system is losing energy. When the system is driven at its natural frequency, resonance occurs so the system gains energy. Total energy being conserved is not a requirement for SHM, SHM can occur without the total energy being conserved.

 

[svenas]

The correct answer was D. Total energy is only conserved in free oscillations. In forced systems, the dampers dissipate energy which means the system is losing energy. When the system is driven at its natural frequency, resonance occurs so the system gains energy. Total energy being conserved is not a requirement for SHM, SHM can occur without the total energy being conserved.

Brilliant! That's what i thought of exactly. I think the correct answer is D and that's what i selected.