Question

Q:

Answer 1

@Vincent-Lyon.Fr

Answer 2

since we have a frictionless pulley, the vertical force on the string the holds block B is equal to the force of the string the holds the cylinder in inclined plane...

Answer 3

right..

Answer 4

T-mg=ma..............(1)
a be the upward acceleration
m=mass of the block
M = mass of the cylinder
r= radius of the cylinder
f+Mgsin30-T=Ma......................(2)
fr+Tr=(1/2Mr^2)a/r
f+T=1/2Ma...........(3)