The Flosberry's Flop

Q. Two spheres of mass $m$ and $M$ of the same radius $R$, are separated by a distance $\sqrt{8}R$. The force of attraction between them is:

1. $\frac{2\sqrt{2}GmM}{27R^2}$
2. $\frac{GmM}{8R^2}$
3. $\frac{GmM}{9R^2}$
4. $\frac{\sqrt{2}GmM}{9R^2}$

Q.

The main reason that a Flosbury flop was so efficient was

1. center of mass was kept above the pole using less force

2. it made you superman

3. center of mass was below the pole

4. it uses aerodynamics to leviate the body

Q.

In which of the following cases center of mass is not inside the body

1. Semicircular disc with varying density

2. hollow metallic sphere

3. a Non uniform rod

4. a Flosbury flop