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Rigid objects in equilibrium M2

https://gyazo.com/3051d9a9875eb4f29376a615b5943fa4?token=e31939c30a650ac18579faa117330b99

Can someone help me with part 3 of this question? Thanks.
If you could show me what's the diagram like I would appreciate it.
Original post by Jian17
https://gyazo.com/3051d9a9875eb4f29376a615b5943fa4?token=e31939c30a650ac18579faa117330b99

Can someone help me with part 3 of this question? Thanks.
If you could show me what's the diagram like I would appreciate it.


Pretty sure part of the spec is for you to be able to draw your own diagrams rather than look at someone else's.

So come on, how would the object look like in the first part of the question? You have a cylinder and a hemisphere. You know how these looks like? Now just attach one to the other so that the centres of both coincide, as well as their plane faces.
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Jian17
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Original post by RDKGames
Pretty sure part of the spec is for you to be able to draw your own diagrams rather than look at someone else's.

So come on, how would the object look like in the first part of the question? You have a cylinder and a hemisphere. You know how these looks like? Now just attach one to the other so that the centres of both coincide, as well as their plane faces.


image-aa808e82-10ff-4917-84f4-e96ada14fe021430771882-compressed.jpg.jpeg
Original post by Jian17
...


Great, you got the final diagram then. There you go. But you should be careful with where you place the centre of mass. Currently you are saying its in the middle of the cylinder, but surely it should be a little closer to the hemisphere? You worked it out in part (ii). Then clearly W=40W=40 Newtons.

Also, your point of contact with the table should be directly below the centre of the hemisphere. Like so:

Spoiler




Now just take moments to finish off the question. Where do you think you should take moments about?
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Jian17
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Original post by RDKGames
Great, you got the final diagram then. There you go. But you should be careful with where you place the centre of mass. Currently you are saying its in the middle of the cylinder, but surely it should be a little closer to the hemisphere? You worked it out in part (ii). Then clearly W=40W=40 Newtons.

Also, your point of contact with the table should be directly below the centre of the hemisphere. Like so:

Spoiler




Now just take moments to finish off the question. Where do you think you should take moments about?


image-034e3d74-dc0c-45b7-9f33-8c37025b6cdf1397663274-compressed.jpg.jpeg

Thanks!
Original post by Jian17


Thanks!


a) Where in the world have you taken moments about?

b) Again, are you sure that the overall CoM is at half the height of the cylinder?

c) Not sure why you said W = 30N

d) Where are you getting sin(40) from?? There shouldn't be an angle of 40 around for you to even use.
(edited 5 years ago)

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