# Mechanics help

Thread starter 9 years ago
#1
a particle of mass 3 kg is attached to one end of each of two strings s1 and s2. A particle of mass 2.5kg is attached to the other end of s1, and a particle of mass 1kg is attatched to the other end of s2. The particles are held in positions shown with the strings taut and s1 passing over a smooth fixed peg. The system is released from rest. Find the acceleration of the particles and the tensions in s1 and s2

sorry but idk how to draw a pic to show you but basically its a pulley with another string under the object on the right.
so you have the 2.5kg weight on the left end of the pulley then the 3kg weight on the right end (attatched by the string, s1) of the pulley with a 1kg weight under the 3kg weight attatched together with a different string, s2.

Thanks
1
9 years ago
#2
Are the springs or strings?
0
Thread starter 9 years ago
#3
(Original post by TenOfThem)
Are the springs or strings?
strings
0
Thread starter 9 years ago
#4
if you have the mechanics book by douglas quadling its pg 118 question 6
0
9 years ago
#5
(Original post by SDavis123)
strings
Do you want to correct your OP then, to make it easier for anyone else reading
0
9 years ago
#6

This?
0
9 years ago
#7
Set up an equation in T1 and a for the 2.5 mass

Set up an equation in T1, T2, and a for the 3 mass

Set up an equation in T2 and a for the 1 mass

you have 3 equations in 3 unknowns, solve them simultaneously
0
Thread starter 9 years ago
#8
(Original post by TenOfThem)

This?
yes thanks
0
Thread starter 9 years ago
#9
(Original post by TenOfThem)
Set up an equation in T1 and a for the 2.5 mass

Set up an equation in T1, T2, and a for the 3 mass

Set up an equation in T2 and a for the 1 mass

you have 3 equations in 3 unknowns, solve them simultaneously

These are the equations I get in order I think I'm going wrong with the bit to do with the bottom string

1. T-2.5g=2.5a
2. 3g +s -t =3a
3. G-s=a

Where s is the pull from the bottom string and t is the tension from upper string

This was posted from The Student Room's iPhone/iPad App
0
9 years ago
#10
(Original post by SDavis123)
These are the equations I get in order I think I'm going wrong with the bit to do with the bottom string

1. T-2.5g=2.5a
2. 3g +s -t =3a
3. G-s=a

Where s is the pull from the bottom string and t is the tension from upper string
Aside from the fact you used a mix of uppercase/lowercase (best to be consistent), they're fine.
0
Thread starter 9 years ago
#11
Yh sorry about that autocorrect :/

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0
Thread starter 9 years ago
#12
I'm having trouble solving them simultaneously :/

This was posted from The Student Room's iPhone/iPad App
0
Thread starter 9 years ago
#13
Don't worry got it

This was posted from The Student Room's iPhone/iPad App
0
Thread starter 9 years ago
#14
got it wrong :'(
This is what I did

This was posted from The Student Room's iPhone/iPad App
0
9 years ago
#15
(Original post by SDavis123)
got it wrong :'(
This is what I did

This was posted from The Student Room's iPhone/iPad App
4th line of writing should say g-a not g+a
0
Thread starter 9 years ago
#16
(Original post by TenOfThem)
4th line of writing should say g-a not g+a

ahhhhh thanks
0
7 months ago
#17
Qn: A particle of mass 3kg 11attached to the lover end B of aThestring upperis fixed to apointend A of the stangon the ceillinga roof. A horizontal force of 201and anOpward vertical force of2.4.91 act upon the particle makingit to be in equilibrium, with theString makingan agle a with theverticle; Find the value of of andthe tension in the string.Help me please
0
7 months ago
#18
(Original post by Wannarex)
Qn: A particle of mass 3kg 11attached to the lover end B of aThestring upperis fixed to apointend A of the stangon the ceillinga roof. A horizontal force of 201and anOpward vertical force of2.4.91 act upon the particle makingit to be in equilibrium, with theString makingan agle a with theverticle; Find the value of of andthe tension in the string.Help me please
Its better to start your own thread and not to bump 8 year old threads.
Also, upload a picture of the question and describe what you've tried. You must realize your posted question is almost unreadable.
0
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