Analysis of an Equation Show that the expression v = at, where v represents speed, a acceleration, and t an instant of time, is dimensionally correct. Dimensions and Units of Four Derived Quantities Quantity Area Volume Speed Acceleration Dimensions L/T L/T2 SI units m2 m3 m/s m/s? U.S. customary units ft2 ft3 ft/s ft/s2 SOLUTION (Use the following as necessary: L and T.) Identify the dimensions of v from the table above: [v] = Identify the dimensions of a from the table above and multiply by the dimensions of t: [at] = Therefore, v = at is dimensionally correct because we have ---Select--- v dimensions on both sides. (If the expression were given as v = at?, it would be dimensionally incorrect. Try it and see!) EXERCISE Suppose you are given the following equation, where x, and x, represent positions at two instants of time, v is a velocity, a, is an acceleration, t is an instant of time, and a, b, and c are integers. X; = x° + v° +ee For what values of a, b, and c is this equation dimensionally correct? Hint a = C =
Analysis of an Equation Show that the expression v = at, where v represents speed, a acceleration, and t an instant of time, is dimensionally correct. Dimensions and Units of Four Derived Quantities Quantity Area Volume Speed Acceleration Dimensions L/T L/T2 SI units m2 m3 m/s m/s? U.S. customary units ft2 ft3 ft/s ft/s2 SOLUTION (Use the following as necessary: L and T.) Identify the dimensions of v from the table above: [v] = Identify the dimensions of a from the table above and multiply by the dimensions of t: [at] = Therefore, v = at is dimensionally correct because we have ---Select--- v dimensions on both sides. (If the expression were given as v = at?, it would be dimensionally incorrect. Try it and see!) EXERCISE Suppose you are given the following equation, where x, and x, represent positions at two instants of time, v is a velocity, a, is an acceleration, t is an instant of time, and a, b, and c are integers. X; = x° + v° +ee For what values of a, b, and c is this equation dimensionally correct? Hint a = C =
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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