IGCSE Physics Paper 1 Variant 1

[JustAnotherPerson22]

The answer for the boat and water wave is Diffraction and Larger gap
using a larger gap would cause a smaller side curve for the waves, using a smaller gap would cause full diffraction which leads to waves going everywhere.
so it's pretty simple that making the gap wider would result in waves travelling almost straight and will be less likely to hit boat
and for the potential voltmeter question
it's 12v to 0v which is "A"
since in potential dividers top is maximum and bottom is minimum
*My work here is done*

 

[JimmyCarter]

The answer for the boat and water wave is Diffraction and Larger gap
using a larger gap would cause a smaller side curve for the waves, using a smaller gap would cause full diffraction which leads to waves going everywhere.
so it's pretty simple that making the gap wider would result in waves travelling almost straight and will be less likely to hit boat
and for the potential voltmeter question
it's 12v to 0v which is "A"
since in potential dividers top is maximum and bottom is minimum
*My work here is done*

i hope ur right about the potential divider, i did the same thing

 

[Adham-amr]

The answer for the boat and water wave is Diffraction and Larger gap
using a larger gap would cause a smaller side curve for the waves, using a smaller gap would cause full diffraction which leads to waves going everywhere.
so it's pretty simple that making the gap wider would result in waves travelling almost straight and will be less likely to hit boat
and for the potential voltmeter question
it's 12v to 0v which is "A"
since in potential dividers top is maximum and bottom is minimum
*My work here is done*

You did both of them wrong bro

 

[JustAnotherPerson22]

You did both of them wrong bro

I'd love an explanation ^___^

 

[Weirdal95]

The potential divider one was from 0 to 12v! not 12v to 0

 

[Weirdal95]

You did both of them wrong bro

He did them right. what are you on about?

 

[Jisu]

which one??

-Liquid expanding
-Its 84 because pressure of gas =atmospheric pressure + difference in height

na ah!
me aint agreein with ya!
gas pressure was low
so it was 20-12=8
then 76-8=68

 

[Jisu]

the boat one was , make gap bigger and diffraction

wasnt it make it smaller??

 

[JustAnotherPerson22]

Y

wasnt it make it smaller??

No making the gap smaller would cause the waves to diffract all around the sea so you're basically giving "more waves" to the boat and the question required a reduction in the number of waves reaching the boat

 

[Jisu]

Y
No making the gap smaller would cause the waves to diffract all around the sea so you're basically giving "more waves" to the boat and the question required a reduction in the number of waves reaching the boat

 

[AhmedMans]

He did them right. what are you on about?

The positive side of battery was upwards so basically R increases along with voltage so it increases from 0 to 12.

 

[Jisu]

explain again??

 

[JustAnotherPerson22]

exactly
which means less waves will reach the boat which is on the side when gap get's larger
hence the answer is diffraction and larger

 

[Jisu]

exactly
which means less waves will reach the boat which is on the side when gap get's larger
hence the answer is diffraction and larger

aaaaaaaaaaaaaaaaahhhhhhhhhhh
y didnt i think a that
screw you~
dont take it to da heart
im just ventin out ma anger
soooorrrrrrrrryyyyy

 

[ATTAR96]

Same Mistake

LOL AGOGo

 

[ATTAR96]

it was niice. i got 59.9 for an answer

yup thats right

 

[Abu mota]

what about the pendulum one? was it strain energy?

 

[Ahmed GolD]

the boat one was , make gap bigger and diffraction

It's make gap smaller , as it gets smaller the waves curve so much and will not be straight so will be less likely tonreach the boat.

 

[Ahmed GolD]

I chose "doesn't move" but the thing is that one was higher than the other thus greater moment, I didn't remember that during the exam :/

The 100N acting downwards from above is cancelled out by the pivot so it doesn't move.

 

[0Louis0]

But when 99% of people in my school choose one answer then it's either we're idiots or the answer is actually right.
Chill.. It's okay we do make mistakes, if you don't wanna get depressed then close this website and go study something cuz no matter what you'll find a different answer than yours and u'll get depressed.
I like getting depressed that's why i started this thread

No bro its either you guys are right or wrong, if being wrong is being an idiot for you then okay

The 100N acting downwards from above is cancelled out by the pivot so it doesn't move.

The force towards the left is bigger than the above force or the one towards the right because it has a larger moment