Question

What is the condition for block b to move downwards
A) mb/ma > sin theta - mew cos theta

B) mb/ma > cos theta + mew sin theta

C) mb/ma > sin theta + mew cos theta

D) mb/ma > cos theta - mew sin theta

And what would the condition for the block to move upwards

A) mb/ma < sin theta - mew cos theta

B) mb/ma < cos theta + mew sin theta

C) mb/ma < sin theta + mew cos theta

D) mb/ma < cos theta - mew sin theta

Answer 1

Answer:

Solution in Photo

Explanation:

To solve this question, draw the Free Body Diagram (FBD) for the whole system such that

theta < 90, it will be more clearer that way.