The density of the solid cylindrical bar shown in the figure is` 5xx 10^(3)` kg `m^(-3)` . The weight of the bar is `"_________"` N. (take g=10 m `s^(2)`

Options

A. 157
B. 1570
C. 320
D. 3.2

Answer

A

Explanation

Density `=5 xx 10^(3) kg m^(-3)`
volume `=pi xx ("radius")^2 xx "height"`
`=3.14 xx (0.1^2) xx 0.1=0.00314 ^3`
Density `=("mass")/("volume")`
Mass `="density "xx "volume "=5 xx 10^(3) xx 0.00314`
`=15.7 kg`
Weight `=m xx g =15.7 xx 10=157N`