A block of steel of size `5xx5xx5 cm^(3)` is weighed in - water. If relative density of steel is 7, its apparent weight is

Options

A. `6 xx 5 xx 5 xx 5 gf`
B. `4 xx 4 xx 4 xx 7 gf`
C. `5 xx 5 xx 5 xx 7 gf`
D. `4 xx4xx 4 xx 6 gf`

Answer

A

Explanation

`W_("app")=mg-F_(B)`
`W_("app") = rho Vg - rho_(w)Vg`
`=(rho-rho_(w))Vg`
`=(7 rho_(w) - rho_(w)) Vg = 6 rho_(w) Vg`