The answer is C) A girl hangs by both hands, motionless, from a trapeze.
Answer:

Explanation:
- We have to make a hollow sphere of inner radius
and outer radius
.
Then the mass of the material required to make such a sphere would be calculated as:
Total volume of the spherical shell:

And the volume of the hollow space in the sphere:

Therefore the net volume of material required to make the sphere:


- Now let the density of the of the material be
.
<u>Then the mass of the material used is:</u>


Coriolis effect that's due to the motion of the Earth
Answer:
The darts hit very different areas of the board.
Explanation: