usq45tx.theexpertta comm 2017 02.27 MAE 13st syllabus 2172-MAE-135-001 https lel

Question

usq45tx.theexpertta comm 2017 02.27 MAE 13st syllabus 2172-MAE-135-001 https lelearnuta.edu/bboswebdav pid-54g00ez-dr-content-rid-51933 The Expert TA l Human-like Grading, Automat Home I Student: dalton milesemavsuta. My Ace edu Class Management I Help Homework 18 Begin Date: 330/2017 9.00:00 PM Due Date: 4/3/2017 (7%) Problem 4: Suppose you exert a force of 185 N tangential to the outer edge of a 166 m radius 77 kg grindstone (which is a a solid disk). Assignment Status Click here for P 33% Part (a) What is the torque T.in newton meters, you are excrting on the grindstone, relative to the center of mass of the grindstone Problem Status Late Work S0% sino coso tano C 7 8 9 Late Potential 50s cotano asino acos() 1 2 3 atan0 acotano sinh0 Antempts remaining cosho tanho cotanho ODegrees Radians Hints: deduction per hint. Hints remaining: Feedback: deduction per feedback. 4 33% Part What is the angular acceleration of the grindstone ao, in radians per square second assuming negligible friction? 33% Part (e) What is the angular acceleration of the grindstone ar. in radians per square second, if there is an opposing frictional force of 19.5 N exerted 0.35 m from the axis?

Explanation / Answer

Simple, the torque is defined as r x F(it's a vector cross product), where r is the perpendicular distance from the force applied about the point, where you want to compute the torque. In this problem the force acts tangential to the solid disc, which has center of mass at the origin. So the net torque at the origin is simply, r the radius times the external force applied, as both are mutually perpendicular. So torque is, 1.66 * 185 N-m = 307.1 N-m.

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