provided the diameter of the fire hose is 7cm, and the water running through the hose flows at 420L/min, how much force does she need to hold the nozzle, if its diameter is 0.75cm

The points for are used for asking questions, so for example let’s say you have a question that’s really urgent the point scale gives you up to 100 points.. not saying you always need to give 100 points but that’s what they are used for. also answering others questions will give you points.

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees.