Speed average

Since these MPUs are used to control fuel-injection systems, it might be interesting to know the 24,000-km rehabiUty (the warranty period). Assuming an average speed of 80 km/h, 300 h of use are obtained. The rehabiUty would be estimated as... 

On a typical pipeline, compressor stations are located at 81—161-km intervals and may contain up to 15 compressors. These stations may use either gas-turbine, reciprocating-engine, and/or motor-driven centrifugal compressors capable of boosting pipeline pressure and keeping gas moving at an average speed of about 24 km/h. Gas-turbine-driven units are the most popular. 

Ohm s law assumes that the drift speed of electrons in an electric field, is small compared to thek average speed, in a... 

Suppose particle A moves through space with average speed v A will collide with a B particle if their center-to-center distance is less than or equal to ta -t- rg. Thus, particle A sweeps out an area irlrA + rB) v in which it can collide with B, and the corresponding volume swept out per second is irfrA -t- rg fv. If the concentration of B is B molecules cm , the number of collisions of B particles by this single A particle, per second, is 7r(rA -t- rgfngv. However, the volume also... 

An estimate is required of the total hydrocarbon concentration 300 meters downwind of an expressway on an overcast day with wind speed 4 m/s. Tlie expressway runs norlli-south and the wind is from tlie west. Tlie measured traffic flow is 8000 vehicles per hour during tlris rush hour, and the average speed of the velucles is 40 mph. At tlris speed tlie average vehicle is expected to... 

The schedule used to measure highway fuel economy (MPG, ), also driven on a chassis dynamometer, is diagramed in Figure 3b. It covers 10.2 miles in 765 seconds at an average speed of 48.2 mph and a peak speed of 59.9 mph. In contrast to the urban schedule, there... 

Angular contact ball bearings average speed and support of radial and thrust load fair orbital sanders, food-processing machinery... 

When enrichment episodes occur in the real world, but not in the laboratory under federal certification tests, real-world emissions are significantly higher than predicted. Further complicating emissions prediction is that aggressive driver behavior and complex traffic flow characteristics play a large role in enrichment occurrence. Current vehicle activity simulation models can predict average speeds and traffic volumes very well, but poorly predict the hard-accel-eration events that lead to enrichment. 

A population of identical particles residing on the sites of C, each having unit mass and moving from site to site with the same average speed. 

A US Airways flight leaves Philadelphia in the early evening and arrives in Frankfurt 8.05 hours later. The airline distance from Philadelphia to Frankfurt is about 6.6 X 103 km, depending to some extent on the flight path followed. What is the average speed of the plane, in kilometers per hour ... 

Strategy Calculate the average speed by taking the quotient... 

SOLUTION The average speed will appear on your calculator as... 

There are three significant figures in the denominator and two in the numerator. The answer should have two significant figures round off the average speed to be... 

From this relation you can see that the average speed u is—... 

Reality Check Notice that the average speed is very high. In miles per hour it is... 

As shown in Example 5.10, the average speed of an N2 molecule at 25°C is 515 m/s that of H2 is even higher, 1920 m/s. However, not all molecules in these gases have these speeds. The motion of particles in a gas is utterly chaotic In the course of a second, a particle undergoes millions of collisions with other particles. As a result, the speed and direction of motion of a particle are constantly changing. Over a period of time, the speed will vary from almost zero to some very high value, considerably above the average. 

Average translational energy Average speed Graham s law... 

At what temperature will a molecule of uranium hexafluoride, the densest gas known, have the same average speed as a molecule of the lightest gas, hydrogen, at 37°C ... 

At room temperature, the average speed of a nitrogen molecule is found to be about one-quarter mile per second. In one second, however, the nitrogen molecule has collided with many other molecules, so its motion follows a zig-zag path. Although the average distance between molecules is small, the molecule passes by many other molecules without hitting them, so the distance it travels between collisions is about fifteen times the average distance between the molecules (at room pressure and temperature). 

The average speed of a helium atom at 25°C is 1.23 X 103m-s . What is the average wavelength of a helium atom at this temperature ... 

This observation is now known as Graham s law of effusion. The rate of effusion is proportional to the average speed of the molecules in the gas because the average speed of the molecules determines the rate at which they approach the hole. Therefore, we can conclude that... 

We have seen that effusion reveals that the average speed of molecules in a gas is inversely proportional to the square root of their molar mass. In effusion experiments at different temperatures, we find that the rate of effusion increases as the temperature is raised. Specifically, for a given gas, the rate of effusion increases as the square root of the temperature ... 

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