HI FREINDS HOW WAS THE PHYSICS ATP GCSE O LAVEL?

[Dark Destination]

So this is wrong

 

[Dark Destination]

That's what my friends are saying but graph was of Length L and Number of bands. When Bands is 11 then Length is 0 so they wanted from bottom to rod.

Lol, wrong.

 

[Dark Destination]

It looked like a test tube to me. You are assuming here it can hold a ruler and a rod inside it. I m not sure that is correct.

But they never told us the dimensions of the container, we can't assume :/

 

[FLRNAB]

Lol, wrong.

Uh my friend, it read "Length, L above the water. "

What was the value in graph other than N. It think it was l/cm

 

[Fate0]

Guys chill. There is no EXACT answer. They're probably gonna be ALOT of methods.

 

[Dark Destination]

About that first part, i wrote the rod is not stationary. That is why the measurement of L can't be accurate.

And in the next part i used a rule again

 

[Fate0]

What was the value in graph other than N. It think it was l/cm

Yes, it was l/cm, that is l, the length of the rod above the water.
Your instructions give us the length of rod BELOW the water.

 

[muhammadali233]

Can anybody tell me the answer of second last part of 1st question?
It was about the number of rubbers needed to sink the rod

i was 11 acording to my graph

 

[muhammadali233]

For question 1, part 2, I wrote that the rod is wrapped in cobalt chloride paper, that part that sinks becomes, pink, it is removed, measured with a ruler and wrote how to avoid parallex error. Is that correct?
Anyone?

I think not so good,i wrote that 2 students are required one holds the rod and the other places the ruler and takes the reading

 

[FLRNAB]

Yes, it was l/cm, that is l, the length of the rod above the water.
Your instructions give us the length of rod BELOW the water.

Damn it.

 

[Dark Destination]

Damn it.

So, now that we've deduced something.

Is my answer right?

 

[muhammadali233]

For question 1 part 1, I wrote that when we touch the rod with the measuring instrument it starts to move, so we had to keep it at a distance and measure the length which might induce paralllex error hence inaccurate.

i wrote the same :O

 

[muhammadali233]

Because identical masses.

i wrote that they have same densities which helps to investigate even drowning of the rod

 

[FLRNAB]

So, now that we've deduced something.

Is my answer right?

Yes that way if L is what you say it is then it is correct but still risky as there might be parallax error due to refraction of light.

 

[DaniyalK]

So, now that we've deduced something.

Is my answer right?

That's right I think but why is the zero mark in the middle of nowhere? It should be at the top or bottom of the rule.

 

[Fate0]

So, now that we've deduced something.

Is my answer right?

Um either the rule should touch the base, or held by a retort stand. And even if you touch it with base, the ruler is bound to move somewhat.

 

[Dark Destination]

That's right I think but why is the zero mark in the middle of nowhere? It should be at the top or bottom of the rule.

I wrote that we should co-incide the zero mark of the rule with the water level.
That way if we vertically align the rule with the rod, and use set-square to find the reading on the rule (avoiding parallax error), the reading will be the length L.

 

[muhammadali233]

That's right I think but why is the zero mark in the middle of nowhere? It should be at the top or bottom of the rule.

yes, 0 side up and measure it

 

[Dark Destination]

Yes that way if L is what you say it is then it is correct but still risky as there might be parallax error due to refraction of light.

There is parallax error everyone. We can never find a perfectly exact value.

 

[Dark Destination]

Um either the rule should touch the base, or held by a retort stand. And even if you touch it with base, the ruler is bound to move somewhat.

Even the rod is moving. It's moving, because it can not remain stationary. Water is never stationary.