marnieeeee
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#1
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#1
Hi, would anyone be able to help me with this?
I've got an answer of 1.8m and that doesn't seem right as the plank is only 2m long.

here's the question:
A non-uniform plank AB of mass 20 kg and length 2 m is pivoted at its midpoint.
The plank is in equilibrium in a horizontal position when a particle of mass 5 kg is placed 40 cm from A and another particle of mass 8 kg is placed 30 cm from B.
Find the distance of the centre of mass of the plank from A


thank youuu
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mqb2766
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#2
(Original post by marnieeeee)
Hi, would anyone be able to help me with this?
I've got an answer of 1.8m and that doesn't seem right as the plank is only 2m long.

here's the question:
A non-uniform plank AB of mass 20 kg and length 2 m is pivoted at its midpoint.
The plank is in equilibrium in a horizontal position when a particle of mass 5 kg is placed 40 cm from A and another particle of mass 8 kg is placed 30 cm from B.
Find the distance of the centre of mass of the plank from A


thank youuu
Upload your working?
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Qxi.xli
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#3
(Original post by marnieeeee)
Hi, would anyone be able to help me with this?
I've got an answer of 1.8m and that doesn't seem right as the plank is only 2m long.

here's the question:
A non-uniform plank AB of mass 20 kg and length 2 m is pivoted at its midpoint.
The plank is in equilibrium in a horizontal position when a particle of mass 5 kg is placed 40 cm from A and another particle of mass 8 kg is placed 30 cm from B.
Find the distance of the centre of mass of the plank from A


thank youuu
draw a diagram and see if that helps?
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mqb2766
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(Original post by Georgiacousins)
Not sure if it’s right but this is how I would do it!
Pls delete, The sticky asks you to give hints not solutions.
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marnieeeee
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(Original post by Georgiacousins)
Attachment 994162
Not sure if it’s right but this is how I would do it!
ohh i always forget about gravity! thank you so much, i understand now
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Golgi Apparatus
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(Original post by marnieeeee)
ohh i always forget about gravity! thank you so much, i understand now
Sorry would you please be able to delete this post? I wasn’t aware of the rules
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marnieeeee
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(Original post by Georgiacousins)
Sorry would you please be able to delete this post? I wasn’t aware of the rules
sorry, what rules?
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ghostwalker
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(Original post by Georgiacousins)
I wasn’t aware of the rules
(Original post by marnieeeee)
sorry, what rules?
Maths forum posting guidelines, covers asking and responding to questions - see here
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marnieeeee
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#9
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(Original post by ghostwalker)
Maths forum posting guidelines, covers asking and responding to questions - see here
thank you! sorry i never meant to break any rules
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ghostwalker
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#10
(Original post by marnieeeee)
thank you! sorry i never meant to break any rules
No problem.
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