A student wishes to determine the density ρ of lead. She measures the mass and diameter of a
small sphere of lead:
mass = (0.506 ± 0.005) g
diameter = (2.20 ± 0.02) mm.
What is the best estimate of the percentage uncertainty in her calculated value of ρ?
A 1.7% B 1.9% C 2.8% D 3.7%

Reply 1947

Thisismyunitsr

20

Original post by monkmaserati

A student wishes to determine the density ρ of lead. She measures the mass and diameter of a
small sphere of lead:
mass = (0.506 ± 0.005) g
diameter = (2.20 ± 0.02) mm.
What is the best estimate of the percentage uncertainty in her calculated value of ρ?
A 1.7% B 1.9% C 2.8% D 3.7%

69

Reply 1948

monkmaserati

6

Original post by Thisismyunitsr

69

lol

Reply 1949

90 cent

16

mechanics is hardddddddddddddd no matter how much i read it goes through one ear and out the other, and tips?

Reply 1950

username5574196

14

Guys im struggling in physics. We done an assessment last week and i managed to get an 61/80 in maths, 53/80 in Chemistry, 47/70 in Economics but 16/80 in Physics (a D) :/ I would kill to get an A. Worst part is I wanna do mechanical engineering and it requires Physics. Physics is one of them subjects im just not good at. Please send urgent help. Any tipssss??????

Reply 1951

Apidafu

9

Original post by Kawalas108

Guys im struggling in physics. We done an assessment last week and i managed to get an 61/80 in maths, 53/80 in Chemistry, 47/70 in Economics but 16/80 in Physics (a D) :/ I would kill to get an A. Worst part is I wanna do mechanical engineering and it requires Physics. Physics is one of them subjects im just not good at. Please send urgent help. Any tipssss??????

Any specific topics your struggling with? Make sure you fully understand all the concepts (use the specification to know exactly what you need to learn). Watching youtube vids really helped me understand certain topics. After you understand the content, go to physicsandmathstutor.com and do as many questions you can. Hope this helped.

Reply 1952

username5574196

14

Original post by Apidafu

Any specific topics your struggling with? Make sure you fully understand all the concepts (use the specification to know exactly what you need to learn). Watching youtube vids really helped me understand certain topics. After you understand the content, go to physicsandmathstutor.com and do as many questions you can. Hope this helped.

Our next paper is going to be paper 1 so it’s going to be on Mechanics and electricity. No matter how many times my teacher teaches us moments I will never get a grip of it. Especially the moment questions with the angles. Some projectile motions questions I get lucky but I’m not good with it. As for the electricity, I know my equations but some of them u had to do advanced steps like finding the negative reciprocal of the total resistance via the sum of the reciprocals of the individual resistances. I’m gonna soon start doing past papers but I can’t do past papers without knowledge of the content. Anything that can help :/

(edited 3 years ago)

Thank you!

Original post by username5574196

Our next paper is going to be paper 1 so it’s going to be on Mechanics and electricity. No matter how many times my teacher teaches us moments I will never get a grip of it. Especially the moment questions with the angles. Some projectile motions questions I get lucky but I’m not good with it. As for the electricity, I know my equations but some of them u had to do advanced steps like finding the negative reciprocal of the total resistance via the sum of the reciprocals of the individual resistances. I’m gonna soon start doing past papers but I can’t do past papers without knowledge of the content. Anything that can help :/

practice man, I remember similarly to you I struggled with the concept of moments at the start and it took me a while of self-teaching to get it, it stressed me out because it seemed easier to everyone else, if you take maths mechanics it will help you a lot with the mechanic's side of physics and fill the gaps in your knowledge.
I assume you've heard of physics and maths tutor? I did a lot of questions on moments and projectile motion and that was enough for me to get it.
as for electricity.. that's just a difficult topic for everyone I can assure you, the only thing I can advise is to do as many exam questions on those topics and get used to the answers the mark scheme favour, a quick way to learn the content as opposed to reading it straight out of the textbook is to go onto revision sites and look for mindmaps etc which summarise what you need to know, it's up to you how you use that information, making your own effective method of revision material is a good start, for physics especially I'd recommend revision cards of exam questions and a structured method you can easily look over and learn how you did it, if you do Edexcel A level maths, I'm not sure whether your AS or A2 the year 2 mechanics textbook is good for demonstrating moments and projectiles

(edited 2 years ago)

Reply 1955

revolutionary360

7

I've been struggling with this question but it seems so simple so I'd greatly appreciate your help
Can someone help me understand why Circuit D is considered to have produced the current voltage data in figure 3? I understand why A, C and B are considered wrong. For example, circuit B is incorrect because the voltage range across R (shown in the graph) cannot be produced as, in circuit B, it cannot achieve a voltage less than about 5 V across R but in the graph the voltage varies from 0 to 16V

However, I don't understand why circuit D is considered right because in circuit D. The voltage across R seems like it will always stay at 14.6V and not vary at all (regardless of how you alter Resistor P's resistance) because it is in parallel with resistor P. Therefore how does that circuit produce the current voltage data in figure 3?

It's mean a lot to me if someone could help as this is bugging me.

Question paper: https://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2019/june/AQA-74072-QP-JUN19.PDF
Mark Scheme: https://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2019/june/AQA-74072-W-MS-JUN19.PDF

Reply 1956

90 cent

16

any tips on how to work on the wordier more contextual 3 marks + explanation questions that actually require logic, I seem to drop most marks on those...

The Physics AS-Level Thread

Related discussions

Latest

Trending

Trending

Articles for you