Thursday

December 18, 2014

December 18, 2014

Posted by **Priyanka** on Sunday, March 25, 2012 at 2:18am.

(a) Find its speed after it has fallen through a distance of 0.90 m?

(b) What is the tension in the rope?

(c) What is the acceleration of the bucket?

m/s^2

Sorry but I have no idea how to do this, so please help! Thank you.

- Physics -
**Damon**, Sunday, March 25, 2012 at 7:38amIs the cylinder solid and what is its radius? We need to know its moment of inertia if we are to find its angular acceleration and therefore the tension in the line.

- Physics -
**bobpursley**, Sunday, March 25, 2012 at 7:39amyou have a tension on the rope, twirling a cylinder. THe tension produces torque, which moves the cylinder.and , it is the cylinder which retards the bucket mass.

bucketweight*radius=MomentInertia*angularacceeration.

moment of inertia for a cylinder. Look it up.

so folve for angular acceleartion from the above.

final speed?

speed=wf*r=I*angacceleration

tension? mg-m(angularacc*r)

acceleration?

m*r*angacceleration

- Physics -
**Damon**, Sunday, March 25, 2012 at 7:45amAssume you can calculate I

alpha = angular acceleration

T r = I alpha

alpha = T r/I

a = alpha r = T r^2/I

so

T = a I/r^2

then the mass

m a = mg-T

m a = m g - (I/r^2)a

a [ m+(I/r^2)] = m g

a = m g /[ m+(I/r^2)]

- Physics -
**Priyanka**, Sunday, March 25, 2012 at 2:06pmSorry, but this is still confusing there is no radius given besides the info I have provided earlier!

**Answer this Question**

**Related Questions**

Physics - A bucket of water with a mass of 4.17 kg is attached to a rope that is...

Physics - A 13 kg bucket of water is attached toa rope that is wound around a ...

Pysics - A wooden bucket ﬁlled with water has a mass of 59 kg and is ...

Physics - A solid cylinder is mounted above the ground with its axis of rotation...

Physics - A solid cylinder is mounted above the ground with its axis of rotation...

Physics - A 2.9-kg 12-cm-radius cylinder, initially at rest, is free to rotate ...

physics - A graduated cylinder is inverted in a very large bucket of water. The ...

physics - A 3 lb bucket containing 40 lb of water is hanging at the end of a 20 ...

physics - A light inflexible cable is wrapped around a cylinder of mass , radius...

physcs - A string is wrapped around a uniform solid cylinder of radius 3.10 cm, ...