Question

What is the force exerted by the ceiling on the pulley system?
Please help:)

Answer 1

Please anybody help me:)

Answer 2

18*9.8 N ... if the pulley is not accelerating and the load on the system has only mass.

Answer 3

but wt is the answer????????????????????
How do u get it??????????????????????

Answer 4

@Vincent-Lyon.Fr sir help plz :)

Answer 5

System is at rest:)

Answer 6

Its answer in my book is given 240 newtons.

Answer 7

I am not sure this system can work without the string slipping in the bottom pulley.

Is the piece of string I pointed attached to the centre of the bottom pulley?

Anyway, if the system is at rest of in steady motion, ceiling should apply an upward force of magnitude F+Weight of mass.

The problem is calculating F if the system does not work! I will think about it and let you know asap.

Answer 8

oh ok but my sir gave solution like this
but i couldn't understood it:(
He said something like this that tension is same in the string.

Answer 9

can u plz make me understand
wt is the actual best solution?

Answer 10

can i?

Answer 11

ya:)

Answer 12

I've just checked. It works and 240 N is correct :-)

Answer 13

ok! but how he gt it ?

Answer 14

Would u plz tell me?

Answer 15

wt. of the load = 18 * 10 = 180 N

Answer 16

right?

Answer 17

ya after that?

Answer 18

now, since this load is connected to three ropes or u can say that it is lifted by three ropes..

TENSION on each rope = 180/3 = 60N

Answer 19

ok then

Answer 20

now, one rope at the right side is ballenced by the force F
right?

Answer 21

ok

Answer 22

so, F = 60 N

Answer 23

Your teacher gave the correct way to solve it quickly:

Force F is the same along the string; eventually, bottom pulley is acted on by 4 forces: 3 equal to F pulling upwards, and 180N down.

As the pulley is at rest, 3F = 180 N => F = 60 N

Then whole system is at rest under reaction of ceiling R which acts upwards and force F and weight which act down.

Hence R = F + 180 = 60 + 180 = 240 N

My method was different, using work and velocities and I find the same result.

Answer 24

right?

Answer 25

Sorry, was busy typing while sauravshakya gave the same explanation.

Answer 26

np:)
& both of u @sauravshakya @Vincent-Lyon.Fr sir helped me a lot
Thank u very much:)

Answer 27

i gt the question.
It is trickier one.

Answer 28

Note that velocity of loose end is 3 times that of the centre of the bottom pulley (v).
At steady speed, power is conserved: 3vF = v x 180 when F = 60 N

Answer 29

ok:)

Answer 30

this is interesting ... what if the other end was fixed at rigid wall? figure not drawn accurately