OCR A Level Physics Modelling physics H556/01 - 26 May 2022 [Exam Chat]

Original post by Rhys_M

Absolutely, utterly fcking shi.t paper. Worst paper 1 I've ever done.
What did people write for the HR diagram question?
I know I've messed up the pressure question (SHM in tube) - I did pgh but then minused 1013hPa (atmospheric pressure) :frown:

.

How do you get 6 marks for that utterly ridiculous tent question? Did you all talk about making tent curved / making the sides of the tent angled to increase time over which momentum of wind is reduced larger (2nd law) and increasing UTS and area of ropes to reduce stress and things like that?

Also for the question where you had to show that time to do something in the engine power question was around 1 minute, did you guys get something like 100 seconds? That's not a minute so idk if was wrong

The 6 marker i don’t think I wrote enough. I got 53 seconds for that one.

Reply 83

holly.bsg

2

Original post by Rhys_M

Absolutely, utterly fcking shi.t paper. Worst paper 1 I've ever done.
What did people write for the HR diagram question?
I know I've messed up the pressure question (SHM in tube) - I did pgh but then minused 1013hPa (atmospheric pressure) :frown:

.

How do you get 6 marks for that utterly ridiculous tent question? Did you all talk about making tent curved / making the sides of the tent angled to increase time over which momentum of wind is reduced larger (2nd law) and increasing UTS and area of ropes to reduce stress and things like that?

Also for the question where you had to show that time to do something in the engine power question was around 1 minute, did you guys get something like 100 seconds? That's not a minute so idk if was wrong

i spent so long on the damn train question but in the end all you had to do was time = energy ÷ power and it gave about 53 seconds?

Reply 84

abcdef1234589

2

I got 53

Original post by Ameister69

The 6 marker i don’t think I wrote enough. I got 53 seconds for that one.

Reply 85

au_3992718

Original post by holly.bsg

can't remember what i got, but yeah pretty sure 10cm was the height to use

I searched it up and found a similar diagram but I'm still confused.
https://www.efunda.com/formulae/fluids/images/Manometer_A.gif

Reply 86

EatHose8745

Just remember its all in the past now. paper 2 and 3 to go. good luck.

Original post by Rhys_M

Absolutely, utterly fcking shi.t paper. Worst paper 1 I've ever done.
What did people write for the HR diagram question?
I know I've messed up the pressure question (SHM in tube) - I did pgh but then minused 1013hPa (atmospheric pressure) :frown:

.

How do you get 6 marks for that utterly ridiculous tent question? Did you all talk about making tent curved / making the sides of the tent angled to increase time over which momentum of wind is reduced larger (2nd law) and increasing UTS and area of ropes to reduce stress and things like that?

Also for the question where you had to show that time to do something in the engine power question was around 1 minute, did you guys get something like 100 seconds? That's not a minute so idk if was wrong

Reply 87

Rhys_M

11

Original post by holly.bsg

i spent so long on the damn train question but in the end all you had to do was time = energy ÷ power and it gave about 53 seconds?

Wait what? I did P=Fv so P=mav, rearranged for a and plugged into suvat which gave like 107 seconds :frown:

Reply 88

Original post by au_3992718

I searched it up and found a similar diagram but I'm still confused.
https://www.efunda.com/formulae/fluids/images/Manometer_A.gif

Yeah so it’s 10cm to use

Reply 89

Original post by Rhys_M

Wait what? I did P=Fv so P=mav, rearranged for a and plugged into suvat which gave like 107 seconds :frown:

The acceleration isn’t constant because the speed keeps changing so u can’t use suvat

Reply 90

tatatatata

What did ppl get for the latent heat calculation

Reply 91

au_3992718

Original post by Ameister69

Yeah so it’s 10cm to use

Yeah I get it now, thanks.

Reply 92

Original post by tatatatata

What did ppl get for the latent heat calculation

I didn’t understand what was going on

Reply 93

tatatatata

Original post by tatatatata

What did ppl get for the latent heat calculatio

I think i calculated the latent heat for fusion and latent heat for water vaporisation then calculate the difference

Reply 94

au_3992718

Original post by holly.bsg

i spent so long on the damn train question but in the end all you had to do was time = energy ÷ power and it gave about 53 seconds?

I used that equation but didn't get 53. hopefully i get method marks or something.

Reply 95

holly.bsg

2

Original post by tatatatata

What did ppl get for the latent heat calculation

not sure, but I calculated energy lost from water when it turned from gas to liquid and liquid to solid, then added them together
used that energy ÷ mass of nitrogen to find latent heat of vapourisation

Reply 96

uni12354

Original post by tatatatata

What did ppl get for the latent heat calculation

I think I worked out nitrogen’s latent heat of fusion. Then did a ratio. So divided lf (nitrogen) by lf(ice) and multiplied by lv (water). Was the only thing I cld think of

(edited 1 year ago)

Reply 97

tatatatata

Original post by uni12354

I think I worked out nitrogen’s latent heat of fusion. Then did a ratio. So divided lf (n) by lf(w) and multiplied by lv (w). Was the only thing I cld think of

I think the latent fusion is for ice

Reply 98

uni12354