RE:Newton's Laws of Motion Block Problem

[rajumahtora]

Homework Statement

In the arrangement shown, all surfaces are frictionless, mass of block M = 30 kg and m = 20 kg.
If F = 180 N , Find accelerations of both the blocks

2. Doubt

How much force will be applied on the larger block M by the pulley(coz of tension)?
1. T towards right
2. T towards up
3. T√2 45° to the right
4. Any other answer3.Reason for doubt

If the total for exerted on the T i(cap) + T j(cap) i.e. Fnet on Bock M due to tension of string on pulley is T√2,
then there will be a force which will tend to pull block M upward...and if the accln of string is much higher, then the tension in the string will cause the block to accelerate up.

[To Jilang and tiny-tim,
After reading ur answer, i had this doubt too...so i asked again]

If anything else, please answer...
Thanks

 

[tiny-tim]

see https://www.physicsforums.com/showthread.php?p=4627014#post4627014