Question

A block of mass 2 kg and density 0.8 g/cm ${}^3$ is held stationary with tnhe help of a string. The tank is accelerating vertically upward with 1 m/s${}^2$. (g=10 m/s${}^2$. ) then find upthrust.

• A. $13.75N$
• B. $27.50N$
• C. $8.6N$
• D. $30N$

Answer 1

The correct option is B $27.50N$

$\text{we know that}$

Up thust $=V{\rho }_{\omega }{g}_{eff}$

$V=\frac{M}{d}=\frac{2000}{0.8}=2.5\times {10}^{3}cc=2.5\times {10}^{-3}{m}^3$

${\rho }_w=1000kg/m^3$

$g_{eff}=10+1=11m/s^2$

$\text{Up thust}=2.5\times {10}^{-3}\times 1000\times 11$

$=27.5N$

$\text{Answerl:-(B)}$