PHYSICS : Modifications of a badminton racquet and pressure cooker?

I need help on Physics


I need at least 5+ answers with the explanations included for the following objects


Badminton Racquet, and Pressure Cooker


What are the suitable modifications can be made?


Oh, and simple answers if possible. Not to complicated


For example


Badminton string has to be tight and tough - to reduce increase impulsive force, to reduce time of impact so that the shuttlecock will travel at a further distance





THANKS!|||Badminton: Longer handle to increase the distance between the point of impact and the pivot, to increase torque.





Pressure Cooker: Thicker walls to increase pressure allowance inside making it more efficient; Better material of construction (more conductive, maybe?) to let it heat up faster.