Question

Two circular metal disc of radii 3.3 cm and 5.6 cm are melted down and cast into a single circular disc of the same thickness.find the radius of the disc

Answer 1

The thrust acting on the cirular disc is dependent on the area covered by the circular disc and the density of the fluid.

In this case, the radii of the two circular discs are given as 3 cm and 4 cm and density of the liquid remains the same.

The area covered is given by πr

2

.

So, the ratio of their thrust will be given as: 3

2

:4

2

=9:16