486(a)2m/s upwards
(b)6m/s downwards
(c)12m/s upwards
14 Answers
996the velocity of B is 2m/s
Akash Anand Dont forget to mention the direction.Upvote·0· Reply ·2013-02-16 06:20:21
1161Till now ..no one is absolutely correct..keep trying. :)
Soumyabrata Mondal sir A moving away from the pulley??
36Yup
2
4
12
Soumyadeep Basu (a) 2 m/s upwards
(b) 4 m/s downwards
(c) 12 m/s upwards
1161Still no one is even close to the right answer. First part for every one is correct. Think about second and third question.
996B) 2m/s downwards
C) 4m/s upwards
- Swarna Kamal Dhyawala sorry C)8m/s upwards
- Akash Anand Excellent.....It will better if you provide the solution as well. Good work
996block B is moving upwards with 2m/s therefore velocity of string d is 2m/s downwards where as if we consider movement of string c attached to movable pulley so it has to move with velocity [2x2(movable pulley) + 2 (fixed pulley)]=6m/s (by length constraint)..
therefore w.r.t D the velocity of c is = 6-(-2)m/s =8m/s upwards
- Akash Anand Good Work :)
535i found your logic unsatisfactory.
If you say that since C is attached to the movable pulley, hence we are applying that constraint reln.
but then, isnt "D" also attached to that same pulley.
why didnt we consider the constraint then?
- Swarna Kamal Dhyawala it is attached movable pulley but as the movable pulley moves up by 2m/s so string C has to move by double velocity .where as D has to only move with 2m/s due to fixed pulley .