An iron block of volume (2.0 10^ -4

PHYSICS · Subjective · CBSE · Physics · Gravitation · Gravitation

Problem

An iron block of volume

2.0 \times 10^{-4}\,\text{m}^3

hangs from a spring balance and is completely immersed in oil of density

800\,\text{kg m}^{-3}

. The container of oil and the balance are inside a lift that is accelerating upward at

2.0\,\text{m s}^{-2}

. Determine the reading of the spring balance. (

\rho_{\text{iron}} = 7.9 \times 10^{3}\,\text{kg m}^{-3}

g = 9.8\,\text{m s}^{-2}

)