Hoop stress is a stress in a pipe wall. It is represented by the forces inside the cylinder acting towards the circumference perpendicular to the length of the pipe.
Hoop stress is derived from Newton's first law of motion. Conceptually, the amount of internal pressure produced must be equal to the stress around the wall of the cylinder to maintain equilibrium and for objects to remain at rest. If forces inside a cylinder are simplified, another stress called longitudinal stress is derived. It is a force pushing against both ends of the pipe. These forces are measured in newtons per square meter (N/m*m) or pascals (Pa).Learn More
A machine is any device that transmits mechanical energy or power into useful work. The simplest machines redirect an applied force or convert kinetic energy into potential energy. More complicated machines are powered by electricity or fuel and use moving parts and electronic circuitry to complete complex tasks.Full Answer >
When a leaf falls, it is being accelerated by gravity to the ground. It is opposed, however, by air resistance, also known as the drag. The net force on a leaf is calculated by subtracting its weight from its drag.Full Answer >
To calculate the flow rate in a cylindrical pipe, the basic formula, which is flow rate is equivalent to pipe cross-sectional area multiplied by velocity, can be used. Here the area is calculated as pi times pipe diameter squared and divided by four.Full Answer >
An common example of a lever is a see-saw. Some other levers are pliers, crowbars, wheelbarrows, scissors, staplers, fishing rods, tweezers, nut crackers and fishing rods.Full Answer >