Question

PHYSICS > SINGLE CORRECT
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Two identical blocks of mass Mare linked by a thread wrapped around a pulley-block with a fixed axis.
A small block of mass m is placed on one of the blocks as shown. If pulley and strings are ideal, the force
exerted by small block mon block Mis.
(A)
mMg
2M + m
(B)
2mmg
2M + m
וח
M M
M
2mMg
M + m
2m’g
(D) 2M + m​

Answer 1

Answer:

Acceleration of the system,

a=

2M+m

mg

∴ Force on M by m,

F=m(g−a)

=m(g−

2M+m

mg

)

F=

2M+m

2Mmg

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