Access to clean water is a problem in many developing countries, especially as clean water sources are often located far away from the people who need the water. The Q Drum water transporter was developed to solve this problem. Its design allows it to transport a large volume of water over long distances simply by rolling the drum. This means that anyone can use the device, including children. The Q Drum holds $50000 {\text{cm}}^3$ of water. Its height is $36$ cm and the diameter of the base is $50$ cm. If the radius of the inner hole through the centre of the drum rounded to the nearest tenths is $r$ cm then find $r$.

The traditional igloo, with its approximately hemispherical dome, is traditionally built by Canadian Inuit and the people of Greenland. It is made of compacted snow, which is a poor conductor of heat, so any heat generated inside the structure will stay inside. If the radius inside an igloo is $1.8$ m, and the volume of air contained inside rounded nearest to tenths is $V {\text{m}}^3$ then find $V$. (Disregard the entranceway in your answers to this question. Just find the volume and surface area of the hemisphere and take $\pi =22/7$)

The traditional igloo, with its approximately hemispherical dome, is traditionally built by Canadian Inuit and the people of Greenland. It is made of compacted snow, which is a poor conductor of heat, so any heat generated inside the structure will stay inside. If the thickness of the walls of compacted snow is $0.5$ m and the inner radius of the igloo is  $0.8$ m, if the surface area of the outside of the igloo rounded to the nearest tenths is $S {\text{m}}^2$ then find $S$. (Take $\pi =22/7$)

The two-piece hard capsule, patented in $1847$, was designed both to ensure the correct dosage of a medication and to make the medicine easy to swallow, without having to taste the medicine. The pharmaceutical manufacturer fills the hollow gelatin capsule with medicines such as antibiotics. Capsules come in many sizes, but a common one has a total length of $11$ mm and a diameter of $5$ mm. If the volume of medicine that a capsule of this size can hold rounded off to tenths place is $V {\text{mm}}^3$ then find $V$. (Take $\pi =22/7$)

The two-piece hard capsule, patented in $1847$, was designed both to ensure the correct dosage of a medication and to make the medicine easy to swallow, without having to taste the medicine. The pharmaceutical manufacturer fills the hollow gelatin capsule with medicines such as antibiotics. Capsules come in many sizes, but a common one has a total length of $11$ mm and a diameter of $5$ mm. If the amount of gelatin needed to produce one capsule rounded off to tenths place is $S {\text{mm}}^2$ then find $S$. (Take $\pi =22/7$)