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EGR 101, section J101, Spring 2020
Homework 5 (Homework)
INSTRUCTOR
Whitney Blackburn-Lynch
Bluegrass Community & Technical College, KY

Print Assignment
Current Score
QUESTION
POINTS
1
4/4

2
4/8

3
0/20

TOTAL SCORE
8/32
25.0
%
Due Date
WED, FEB 19, 2020
10:00 AM EST

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Description
Assignment Submission & Scoring
Assignment Submission
For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring
Your best submission for each question part is used for your score.

1.
4/4 points
Previous Answers
MoaveniEng6 10.3.030.
My Notes
The tire wrench shown in the figure below is used to tighten the bolt on a wheel.
L = 2 ftF = 30 lb80°
A tire wrench is attached to a bolt at point O on a wheel near its center. The wrench extends horizontally to the right a distance L = 2 ft. A force F = 30 lb acts on the right end of the wrench in two different situations. In one situation, the force acts vertically downwards on the wrench. In the other situation, the force acts down and left on the wrench at a 80° angle below the horizontal.
Given the information on the diagram, determine the moment (magnitude in lbf · ft and direction) about point O for the two loading situations shown.
(a)
pushing perpendicular to the wrench arm
magnitude
60

Correct: Your answer is correct.
lbf · ft
direction
Correct: Your answer is correct.
(b)
pushing at a 80° angle
magnitude
59.1

Correct: Your answer is correct.
lbf · ft
direction
Correct: Your answer is correct.
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2.
4/8 points
Previous Answers
MoaveniEng6 10.3.034.
My Notes
Determine the sum of the moments (magnitude in N · m and direction) created by the forces shown in the figure below about points A, B, C, and D.
41 N41 N82 N
A long, thin rectangle is oriented such that its long side goes down and right at a 35° angle below the horizontal. Four points are labeled and three forces act on the rectangle.
Point A is at the top left end of the rectangle.
Point B is 5 cm from point A down and right along the rectangle. A force of 41 N acts up and right on the rectangle, perpendicular to its length.
Point C is 2 cm from point B down and right along the rectangle. A force of 41 N acts vertically upwards on the rectangle.
Point D is 3 cm from point C along the rectangle. A force of 82 N acts vertically upwards on the rectangle.
Point A:
magnitude 8.2
Incorrect: Your answer is incorrect.
N · m
direction
Correct: Your answer is correct.
Point B:
magnitude

Incorrect: Your answer is incorrect.
N · m
direction
Correct: Your answer is correct.
Point C:
magnitude
8.2

Incorrect: Your answer is incorrect.
N · m
direction
Correct: Your answer is correct.
Point D:
magnitude
10

Incorrect: Your answer is incorrect.
N · m
direction
Correct: Your answer is correct.
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