A skydiver's parachute increases the skydiver's velocity by increasing his cross sectional area. Air resistance is affected by two factors: how fast the skydiver falls and his cross sectional area.
Know MoreAs the skydiver falls, he falls faster and faster, and his air resistance increases until he reaches terminal velocity, which is the fastest speed that he will fall. But the skydiver's air resistance can also be affected by another factor: his position with respect to the gravity. This is why a skydiver usually dives spread eagle; if he were to dive feet first, he would not have as much air resistance and would reach an even faster terminal velocity.
However, the cross-sectional velocity of the skydiver alone is not enough to slow him down a sufficient amount so that he can land safely. This is where the parachute comes in. When the parachute is opened, it covers a large area as the wind opens it up. This greatly increases the air resistance, and is the reason why there is usually a snap up when the parachute opens and the cross sectional area of the combined skydiver/parachute suddenly increases greatly. This ultimately slows the terminal velocity of the skydiver down to the point where he stops moving.
Learn more about Motion & MechanicsTerminal velocity is the velocity at which an object in freefall no longer accelerates due to gravity because the drag force of the surrounding air equals the gravitational force of Earth. Objects with more mass have more weight, and it takes more drag force to reach terminal velocity.
Full Answer >A Magnehlic gauge is used to measure fan pressure, blower pressure, air velocity, furnace draft, pressure drop across orifice plates, liquid levels in bubbler systems, pressures in fluidic systems and filter resistance, according to Dwyer Instruments, Inc. These types of gauges are primarily found in commercial and industrial applications with regards to heating, ventilation and air conditioning (HVAC) systems.
Full Answer >Some examples of momentum are a truck moving towards the east at a given velocity and a basketball with a mass traveling through the air in a southerly direction. The momentum of an object is a vector quantity that is given by the formula mass multiplied by the velocity, or p= m x v.
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.
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