A recycling plant wants to use Tinkercad to design its waste segregation system. With reference to the given scenario, answer the following questions:

(a) Two ways in which Tinkercad can help are:

1. Tinkercad provides 3D designs of different components, so the plant can design and visualise the physical parts of the segregation system, such as the bins, the sorting arm and its joints, before actually building them.
2. Tinkercad is used to visualise, design and create circuits, so the sensor and motor circuit that separates the wet and dry waste can be built and simulated virtually to check whether it works correctly.

(b) A revolute joint should be used. A revolute joint, also known as a rotary joint, allows the links to rotate around an axis. This rotational movement lets the sorting arm or flap turn towards the wet waste bin or the dry waste bin as required.

(c) The model should be visualised before it is used because:

1. It helps in understanding the design clearly.
2. It helps to identify and correct errors in the design at an early stage.
3. It confirms that the components work together as expected before the system is built, saving time and cost.