Question

Two objects 7kg and 5kg are attached to an inextensible string which passes over a frictionless pulley such that 5 kg is moving over a frictionless horizontal surface and mass 7kg is moving vertically downwards. Find acceleration in the system and tension in the string.​

Answer 1

Answer:

The equation of motion for mass M

1

: M

1

a=T−M

1

g ...(1)

and for mass M

2

: M

2

a=M

2

g−T ....(2)

(1)+(2)⇒a(M

1

+M

2

)=(M

2

−M

1

)g

or a=

M

1

+M

2

(M

2

−M

1

)g

=

7+12

(12−7)(10)

=(50/19)m/s

2

From (1), T=M

1

(a+g)=7(50/19+10)=88.42N

Answer 2

Answer:

12 kg

Explanation:

1 kg - 1000 m so we have to + it