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Why does the density of an incompressible fluid remains constant?
In incompressible fluid density is same because velocity gradient is same on every layer of liquid at any cross section.
Why the divergent section of a venturimeter is longer than the convergent section?
The divergent section of a venturi meter is longer than the convergent section to gradually decrease the fluid velocity and increase the pressure after the throat, which helps in recovering some of the kinetic energy as pressure energy, reducing energy losses and ensuring accurate flow rate measurement. This design also helps to minimize turbulence and pressure drop in the system.
What is the reasons for the observed changes in blood flow velocity in the different regions of the circulation?
The speed velocity of blood flow changes as blood travels through the systemic circulation. This change can be faster or slower. It is fastest where the cross-section area of the vascular bed is least, and slowest where the total cross-section area is greatest. This slow flow allows nutrient-waste exchange.
The average velocity of an object moving along a straight line is always as big as its instantaneous velocity?
Not at all. If it slows down or speeds up at any point, then it'll have different instantaneous velocity at different points, and its average velocity for some section of the line can be yet another different number. Simple example: A guy drives home from the office at a steady speed of 35 miles per hour. On the way, he stops buy a soda. His instantaneous velocity is zero during the stop, and 35 miles per hour whenever he's moving. His average velocity for the trip home is more than zero, and less than 35 miles per hour.
How is stream discharge calculated?
Methods for Determining Stream Discharge: 1) Select a site to measure the stream's wetted width, record it, and divide it into at least 10 equidistant intervals (no interval should exceed 3 meters in width). 2) At each interval measure and record the depth. With a current meter (adapted from F.R. Hauer and G.A. Lamberti. 1996. Methods in Stream Ecology. Academic Press.): 3) At each interval, place the current meter into the stream, with the meter facing into the current and the operator standing downstream of the current meter. Make sure that eddies around the operator's legs do not disturb the activity of the current meter. 4) If the depth is less than 60 cm, read the velocity at 0.4 x D, measured upward from the streambed. If depth is greater than 60 cm., read and record velocities for 0.2 x D and 0.8 x D. The mean velocity is the average of the two velocities. 5) It the water column for the cell being measured contains large submerged objects (logs, boulders, etc...) or is disturbed by overhanging vegetation, read and record the velocities at 0.2D 0.4D, and 0.8D. Calculate the mean velocity as V = 0.25(V0.2 + V0.4 + V0.8) 6) If the velocities are extremely high or flood flows exist, measure and record the velocity at the surface. Calculate the mean velocity using the equation V = kVs, where k = 0.85. With a float (adapted from C.C. Harrelson, C.L. Rawlins, and J.P. Potyondy. 1994. Stream Channel Reference Sites: An Illustrated Guide to Field Technique. USDA Forest Service General Technical Report RM-245): 3) Measure a length of stream that approximates two to three channel widths. This is the designated reach length, L. This section should overlap one of the sections being measured for cross-sectional area if possible. Mark the upper and lower ends of this interval with a stake or a string across the stream. 4) Choose a float that is only slightly buoyant (oranges are commonly used), this will minimize the influence of air currents and provide a more accurate representation of stream velocity. 5) Introduce the float a slight distance upstream of the upstream marker so that the float can reach the speed of the water prior to passing the upstream marker. In large rivers (> 10 m in width), divide the stream into thirds and make several passes with the float in each third to obtain an average velocity. 6) Use a stopwatch or wristwatch to measure the time (t) of travel of the float between the upstream and downstream marks. Record several measurements through each section to obtain an average. Surface velocity is calculated as Vs = L/t. A correction factor, k, for the roughness of the bed must be applied to estimate the mean velocity, V: V = kVs. The correction factor varies between 0.8 for rough beds and 0.9 for smooth beds, but 0.85 is most commonly used. Steps 7 and 8 will require the use of a calculator or a computer and may be completed after leaving the field. 7) Calculate and record the discharge for each cell (n) as Qn = wnDnVn, where wn is the width of the cell (m); Dn, the depth of the cell at the midpoint (m); and Vn, mean velocity of the cell at the midpoint (m/s). 8) Discharge (Q) for the transect is calculated as: Q = sum of Qn = w1D1V1 + w2D2V +.....+ wnDnVn Source: http://waterontheweb.org/curricula/ws/unit_01/Mod_4_5/Measuring%20Discharge.doc
What Section did Klinger try to leave the army with a medical discharge?
Section 8
What is cross section velocity method?
The cross section velocity method is a technique used in hydrology and fluid mechanics to measure and analyze the flow of water in open channels or rivers. By taking measurements across various cross sections of the water body, the method calculates the average velocity of the flow at each section, which helps in determining discharge and understanding flow patterns. This approach is essential for water resource management, flood forecasting, and ecological studies. It typically involves using instruments like flow meters and can be complemented with data from hydraulic models.
Do Platypuses move through seasons?
No. Platypuses remain in the same territory throughout their lives. They stay within the same section of riverbank through all seasons, unless drought causes the water levels to drop to such a point where the platypus can no longer find food. This is the only time a platypus will attempt to leave, heading for another water source.
What is a discharge geology?
discharge generally refers to rivers and is more associated with hydrology. it is the amount of water flowing through a specific cross section along the river. the formula for discharge, Q, is Q=Au where A=cross section area, u=avg flow velocity
Why is there a twist in a propeller blade?
to keep the angle under which propeller section sees the relative velocity. Because, a propeller essentially is a wing which rotates around an axis parallel to the flight velocity. wings operate best at a certain angle of attack, which is an angle at which wing 'sees' the flow. now, propellers rotate and tangential velocity increases from root to tip. airflow velocity is obviously constant. tangent of angle between relative velocity and prop section is air velocity / tangential velocity. we want angle between propeller section and relative velocity to constant, since tangent changes from root to tip , we need to change angle of propeller section itself.
Does section 8 keep people down?
In the original sense- it referred to a psychopathological military discharge- keeps them out of the Armed forces. - in other words , a Nut discharge.
Is the quantity of water flowing past a certain stream cross section per unit?
Discharge
How do you convert liquid velocity of a specific density to liters per second?
Multiply the velocity in cm/s by the cross section area of the flow in sq cm.
Is there a picture of Daniel J Levinson- a sociologist?
There is a photograph of him in the "about the author" section of his book, The seasons of a woman's life.
In the graph which region shows nonuniform positive acceleration?
A region with nonuniform positive acceleration on a velocity-time graph would appear as a curved or non-linear section where the velocity is increasing at a variable rate.
What is an absolute discharge?
An absolute discharge can be granted to a person found guilty of having committed certain violation of the Criminal Code of Canada. This measure is described under Section 730 of the Criminal Code. The accused benefiting of an absolute discharge is deemed not having been convicted. Absolute discharge is usually granted when the facts involved are of lesser gravity or concern a defendant without a record.
What is the formual for acceleration?
If the acceleration is constant.... The formula for velocity is v = v₀ + at For distance it is d = d₀ + v₀t + ½at² For velocity without time it is. v² = v₀² + 2ad For more details refer to the related link in the Related Links section below. The subject is called kinematics
