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Express the force f in cartesian vector form if it acts at the midpoint b of the rod.

21/12/2020 Client: saad24vbs Deadline: 10 Days

MAE 201 – Mechanics of Particles and Rigid Bodies I: Statics – Fall 2017


1


Assignment: #1 Total Problems 60 points total. Each problem is worth 10 points


Due: 4:00 PM, September 2nd, 2017 Instructions: Complete all of the assigned problems. You do not need to


complete and submit the suggested problems. Suggested problems will be uploaded in a separate document on piazza.


All solutions must follow the seven-step problem setup process detailed in class. Failure to follow this process will result in a 0 for that problem. Remember that only variables are allowed in your schematics or FBDs – no numbers. Write N/A if a step does not apply to a particular problem (example, there may not be any assumptions if you are just computing the angle between two vectors, so Step 5 could read: 5) Assumptions: N/A).


Problem: 1. A weight 𝑊 of 100 𝑙𝑏𝑓 is supported by a system of wires as shown below. Find the tension 𝑇! , 𝑇! , 𝑇! , and 𝑇! in the wires of the system.


Suggested Review Problems: S1-1 through S1-5


Problem: 2. The two vectors 𝑎 and 𝑏 in the figure shown below have equal magnitudes of 10.0 𝑚. Find:


a. Their vector sum 𝑟 using the parallelogram law. b. The 𝑥 and 𝑦 components of their vector sum 𝑟. c. The magnitude of their vector sum 𝑟. d. The angle 𝑟 makes with the positive direction of the 𝑥 axis.


Suggested Review Problems: S2-1 through S2-5


127


© 2016 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.


2–106.


Express the force F in Cartesian vector form if it acts at the midpoint B of the rod.


SOLUTION


rAB = rAC 2


= -3i + 4j - 4k


2 = -1.5i + 2j - 2k


rAD = rAB + rBD rBD = rAD - rAB


= (4i + 6j - 4k) - (-1.5i + 2j - 2k)


= {5.5i + 4j - 2k} m


rBD = 2(5.5)2 + (4)2 + (-2)2 = 7.0887 m F = 600 arBD


rBD b = 465.528i + 338.5659j - 169.2829k


F = {466i + 339j - 169k} N Ans.


3 m


4 m y


x


z


6 m


4 m


4 m


O F ! 600 N


B


A


C


D


Ans: F = {466i + 339j - 169k} N


x


u⃗


q⃗


A(0, 0, 6) B lies along line AC C(-3, 4, 0) D(4, 5, 0)


Problem: 3. Compute the total force exerted by the four forces exerted on the eye hook. Express the solution in terms of the magnitude and direction (clockwise rotation from the x-axis) of the resultant force. Suggested Review Problems: S3-1 through S3-3


Problem: 4. In the schematic below, point B lies a distance x from point A along line AC; u is the unit vector along line AC, and q is the unit vector along line BD. The locations for A, C, D are listed in the schematic. In Cartesian coordinates/vector form: i) find the unit vector u; ii) find the coordinates for point B as a function of x. iii) Find the unit vector q as a function of x. Suggested Review Problems: S4-1 through S4-6


Problem: 5. (a) Determine the magnitude of the resultant force acting on the eyebolt; (b) determine the coordinate direction angle α of the resultant force acting on the eyebolt; (c) determine the coordinate direction angle β of the resultant force. Suggested Review Problems: S5_6-1 through S5_6-3


Problem: 6. Determine the magnitude and coordinate direction angles of F3 so that the resultant of the three forces is zero. NOTE: figure not drawn to scale. Suggested Review Problems: S5_6-1 through S5_6-3 (same as for Problem 5)


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