A hollow steel ball with an outer volume of 0.310m3 and an inner volume of 0.300m3 is attached to the seabed with a chain so that it
ends up under water when the sea is high (when the water is high).
(a) How much buoyancy does the ball have when it is under water?

The Earth is the only planet in our solar system and the entire universe that is known to support life within its atmosphere. Our atmosphere is made up of nitrogen, oxygen, carbon dioxide and argon. Other planets atmospheres are made up of different elements and compounds, Neptune, for example has an atmosphere of hydrogen, helium and traces of hydrocarbons; nitrogen is also thought to be on Neptune as well.Earth is the third planet from the sun at 150 000 000km away, in front of earth are Venus at 108 000 000km away and then Mercury 57 900 000km away. Earth has only one moon; whereas other planets have multiple moons except Mercury and Venus which have no moons.