Urgent maths help!!!
anyone know where this question is from???
A ladder AB has mass M and length 6a.
The end A of the ladder is on rough horizontal ground.
The ladder rests against a fixed smooth horizontal rail at the point C.
The point C is at a vertical height 4a above the ground.
The vertical plane containing AB is perpendicular to the rail.
The ladder is inclined to the horizontal at an angle a, where sin a= 4/5,, as shown in Figure 1.
The coefficient of friction between the ladder and the ground is u.
The ladder rests in limiting equilibrium.
The ladder is modelled as a uniform rod.
Using the model,
(a) show that the magnitude of the force exerted on the ladder by the rail at C is 9Mg/25
(b) Hence, or otherwise, find the value of mu.
A ladder AB has mass M and length 6a.
The end A of the ladder is on rough horizontal ground.
The ladder rests against a fixed smooth horizontal rail at the point C.
The point C is at a vertical height 4a above the ground.
The vertical plane containing AB is perpendicular to the rail.
The ladder is inclined to the horizontal at an angle a, where sin a= 4/5,, as shown in Figure 1.
The coefficient of friction between the ladder and the ground is u.
The ladder rests in limiting equilibrium.
The ladder is modelled as a uniform rod.
Using the model,
(a) show that the magnitude of the force exerted on the ladder by the rail at C is 9Mg/25
(b) Hence, or otherwise, find the value of mu.
Reply 1
Not certain, but it looks very similar to some of the questions here: https://mathsmartinthomas.files.wordpress.com/2014/12/m2-statics-pastq.pdf
Reply 2
Ladder questions like this are ubiquitous. What makes this one a bit unusual is that the ladder rests against a rail rather than a wall. Why do you need to know where it's from?
Reply 3
Did you ever find out where this question is from I had in my recent paper and I just want to see the solutions as I keep getting 9Mg/20
But when I model the rod as non uniform I get 9Mg/25.
And now I'm a bit paranoid about what mu could be 🥲
But when I model the rod as non uniform I get 9Mg/25.
And now I'm a bit paranoid about what mu could be 🥲
Reply 4
Was there a diagram for this question
Reply 5
Well I worked it out I had a diagram in my question but it never stated 4a as a height
Original post by scoobiedoobiedoo
Well I worked it out I had a diagram in my question but it never stated 4a as a height
good
(edited 4 years ago)
Reply 8
Original post by scoobiedoobiedoo
Well I worked it out I had a diagram in my question but it never stated 4a as a height
hello, thanks so much for working through this publicly i was so stuck! would you be able to explain to me your horizontal forces because i couldn’t get the Rcsinx to be horizontal, only diagonal :/
Reply 9
Original post by FaccoyKazz
hello, thanks so much for working through this publicly i was so stuck! would you be able to explain to me your horizontal forces because i couldn’t get the Rcsinx to be horizontal, only diagonal :/
Oh my I did this question such a long time ago aha but if you are really stuck on forces and static rigid bodies I suggest for you to look at the website maths genie a level revision.
He does revision videos for all topics as well as questions for you to work on with solutions.
Maths takes a lot of practise and time aha
Reply 10
Original post by scoobiedoobiedoo
Oh my I did this question such a long time ago aha but if you are really stuck on forces and static rigid bodies I suggest for you to look at the website maths genie a level revision.
He does revision videos for all topics as well as questions for you to work on with solutions.
Maths takes a lot of practise and time aha
He does revision videos for all topics as well as questions for you to work on with solutions.
Maths takes a lot of practise and time aha
no worries i understand it was a long time ago!😂thanks so much for the suggestion i definitely will have a look!
Original post by scoobiedoobiedoo
Did you ever find out where this question is from I had in my recent paper and I just want to see the solutions as I keep getting 9Mg/20
But when I model the rod as non uniform I get 9Mg/25.
And now I'm a bit paranoid about what mu could be 🥲
But when I model the rod as non uniform I get 9Mg/25.
And now I'm a bit paranoid about what mu could be 🥲
Original post by Grace xox
Yes same I am so confused 😕
I just googled part of the question and it came up with a YouTube walkthrough - apparently it's Edexcel A-Level Mathematics - October 2020 - Mechanics - Question 4
Edexcel A-Level Mathematics - October 2020 - Mechanics - Question 4 - Exam Paper Walkthrough - YouTube
Original post by davros
I just googled part of the question and it came up with a YouTube walkthrough - apparently it's Edexcel A-Level Mathematics - October 2020 - Mechanics - Question 4
Edexcel A-Level Mathematics - October 2020 - Mechanics - Question 4 - Exam Paper Walkthrough - YouTube
Edexcel A-Level Mathematics - October 2020 - Mechanics - Question 4 - Exam Paper Walkthrough - YouTube
oh ok thanks I'll take a look
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