Review. The instantaneous position of an object is spec- ified by its position vector leading from a fixed ori- gin to the location of the object, modeled as a parti- cle. Suppose for a certain object the position vector is a function of time given by f = 4î + 3j – 2t k, where r is in meters and t is in seconds. (a) Evaluate d T/dt. (b) What physical quantity does d 7/dt represent about the object?

Review. The instantaneous position of an object is spec- ified by its position vector leading from a fixed ori- gin to the location of the object, modeled as a parti- cle. Suppose for a certain object the position vector is a function of time given by f = 4î + 3j – 2t k, where r is in meters and t is in seconds. (a) Evaluate d T/dt. (b) What physical quantity does d 7/dt represent about the object?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter1: Units And Measurement

Section: Chapter Questions

Problem 33P: In SI units, speeds are measured in meters per second (m/s). But, depending on where you live,...

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In SI units, speeds are measured in meters per second (m/s). But, depending on where you live, you’re probably mole comfortable of thinking of speeds in terms of either kilometers per hour (km/h) or miles per hour (mi/h). In this problem, you will see that 1 m/s is roughly 4 km/h or 2 mi/h, which is handy to use when developing your physical Intuition. More precisely, show that (a) 1.0m/s=3.6km/h and 1.0m/s=2.2mi/h .
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