MAE 101 Midterm #1 Fall 2010 Solutions

MAE 101 Midterm #1 Fall 2010 Solutions - MAE 101 Fall 2010...

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Unformatted text preview: MAE 101 Fall 2010 Midterm Examination #1 October 25, 2010 Instructor: Professor Gupta DO ALL WORK ON THE EXAM ATTTACH ADDITIONAL SHEETS AS NEEDED WRITE YOUR NAME ON EVERY SHEET YOU USE NOTE: ALL EQUATIONS OF EQUILIBRIUM MUST HAVE ASSOCIATED FREE BODY DIAGRAMS l/E Problem 1 6 Problem 2 Problem 3 / 0 Problem 4 @_ TOTAL (100) NAME; Q fol/MS ID: Problem 1: A packing case containing a machine tool and weighing a total of 1.7 kN is being maneuvered with the aid of a light crowbar as shown. Assume that the packaging case at point A rotates freely without slipping, that is, it acts like a pin joint, and the crowbar provides support at point B that is frictionless. The distribution of mass within the case is such that its center of gravity is at the center point. The crowbar rests on frictionless rollers at C, so there is no resistance as C slides along the horizontal direction over the floor. Find the magnitude and direction of the force which must be applied to end D of the crowbar to hold the packing case in equilibrium. (35 points) FEB 04‘? cage; :MA:O3' Rn (1GOMm> '3 O WWW : HGCOSQDSQ: COSG59223qimm and g! : iilngqi : 05%; m 4280 2’ F :O : RficfiOo "FCogd 3 O V r "QOO FEM/3% ’ - ‘ ‘2: 90¢! k0 Rosemaagaflcosm, 0 0‘ ,n r ~ f 0 gm“ : 80x055$¥sm10+ 500x0.fi0°i 61am???) Fsma 3 0,1385 H0 Problem 2: A rigid rod with negligible weight and small radius carries a load W whose position is adjustable. The rod rests on a small roller at A and bears against the vertical wall at B. Determine the distance x for any given value of 6 such that the rod will be in equilibrium. Assume that friction is negligible at contact points A and B. (25 points) Assume: it No JQrgchion on where L y t i g 2. MO 0‘0 (00‘ (l‘l’ \8 Nigel) Bi EClWlibrium {3({3‘3 FED 0(3 rod“. Problem 3: Find the force in member BD 0f the truss shown below, and indicate whether it is in tension or in compression. (10 points) Problem 4: A straight bar of radius r is bent at B to form an L—shaped member ABC so as to form two straight legs AB and BC. It is built-in at A and lies in a horizontal plane when it is unloaded. Find all reactions at A that are necessary for the structure to be in equilibrium for any gm value of the applied load P in the vertically downward direction (that is, —y direction). (30 points) ...
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This note was uploaded on 11/29/2010 for the course MECH&AE 101 taught by Professor Mal during the Spring '08 term at UCLA.

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MAE 101 Midterm #1 Fall 2010 Solutions - MAE 101 Fall 2010...

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