Question

Harry Houdini is trapped inside a glass box which weighs 150kg and has dimensions of 0.5m × 0.5m × 2m. The box is tied to an anchor of mass 350kg and is dropped into a lake. In order to escape, he tries to break the glass by kicking it. Will he be able to escape? If so, how much time does he have to break the glass and escape safely?

Answer 1

Answer

The density of box

$\rho =\frac{M}{V}=\frac{150}{ 0.5m × 0.5m × 2m }\\=300kg/m^3$

Whereas the density of water is

1000 $Kg/m^3$

So density is lesser than lake water so he is able to escape

And he need at least 3times hit the glass.