Question

An iron block and a wooden block are positioned in a vessel containing water as shown in the figure. The iron block (1) hangs from a massless string with a rigid support from the top while the wooden block floats being tied to the bottom through a massless string. If now the vessel starts accelerating upwards.

• A. tension in the string $1$ will decrease
• B. tension in string $1$ increase
• C. tension in string $2$ decrease
• D. tension in string $2$ will increase

Answer 1

Answer: (B), (D)

The correct options are
B tension in string $1$ increase
D tension in string $2$ will increase

As we know

$T_1=(d_i-d_w)Vg$

$T_2=(d_w-d_{wood})Vg$

now, since vessel starts accelerating upwards.

$g_{eff}$ increases so,

tension in both strings will increase.