Answer:
SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.
When red litmus paper comes into contact with any alkaline substance, it turns blue. Some examples of alkaline substances are ammonia gas, milk of magnesia, baking soda and limewater.
Answer:
People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist
To solve this problem it is necessary to apply the concepts related to Torque as a function of Force and distance. Basically the torque is located in the forearm and would be determined by the effective perpendicular lever arm and force, that is

Where,
F = Force
r = Distance
Replacing,


The moment of inertia of the boxer's forearm can be calculated from the relation between torque and moment of inertia and angular acceleration

I = Moment of inertia
= Angular acceleration
Replacing with our values we have that



Therefore the value of moment of inertia is 
To see if the project is actually going to work. Also called prototypes