The diagram shows an open topped tank used for storing coolant. The tank has a 400mm wide hinged door. 630 Coolant Hinge Diagram not to scale and all dimensions in mm. Hinged door 1-Calculate the overturning moment of the door around the hinge. State your answer to 3 significant figures (3SF). Tank wall The hinged door is secured using a bolt that is held in place by a catch. The bolt has been designed specifically for this size of tank and hinged door. Hinged door Catch Bolt 2- Explain how the design of the bolt would need to change if the size of the hinged door was increased.