When an object moves, its position changes as a function of time, which is the definition of displacement. The distance (d) of the displacement is a scalar quantity and the displacement (d) of the object is a vector quantity, i.e. it has both a...

Mathematically a vector in the plane is just an ordered pair of real numbers. Physicists tend to embellish this rather spare definition so that their vectors are represented by arrows with direction and magnitude indicating the direction and strength...

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The term velocity is often confused with speed; to understand the concept of velocity, it is helpful to first understand what is meant by speed.Average speed is determined by dividing the distance traveled by the time required to move that distance. If...

In physics, velocity is defined as the rate of change of position. It is a vector physical quantity, both speed and direction are required to define it. In the SI (metric) system, it is measured in metres per second: (m/s) or ms-1. The scalar absolute...

When it comes to estimating pressure loss through piping different methods work best for different applications. One of the recurring concerns with designing water-based fire suppression systems is the need for velocity limits. Part of the debate focuses on possible limitations of the...

Dave Eggers is many things. A celebrated author and the voice of a generation, for example. What we admire most about the man behind "A Heartbreaking Work of Staggering Genius" is his Do-It-Yourself ethos. Instead of signing with a major publisher for scads of...

How fast a man's PSA level is rising _ even before it's high enough to trigger a doctor's alarm _ may signal that he has a life-threatening form of prostate cancer when the tumor is still small enough to be...

Prostate cancer is more likely to be life-threatening if the man's PSA level rose rapidly during the years before he was diagnosed, says a new study that may help change how PSA tests are used. The finding could...