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"why" we need vectors and scalar quantities don't tell me only give example of each vector why ? scalar why ? if we don't have them what are the disadvantages please |
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Answer» Answer: measurement of a quantity, like temperature, or mass. A vector has more than one number associated with it. A SIMPLE example is velocity. It has a MAGNITUDE, called SPEED, as well as a direction, like North or Southwest or 10 degrees west of North. You can have more that two numbers associated with a vector. For example you can add a height dimension to velocity and say, for example, ' I am going uphill at a 5 degree slope in the NORTHEAST direction'. Vectors are frequently BROKEN down into their components along an orthogonal coordinate system, like the x and y axes. So you can say the y-component of my speed is 3 km/sec and the x-component of my speed is 4 km/sec. The magnitude, or speed is the square root of the sum of the individual components, 5 in this case. The direction with respect to the x-axis would be given by the arctangent of Vy / Vx or 36.9 degrees. |
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