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ENGR 213-001 Sp17 / HW CH 12
*P12.081 GO Multipart
*Part 1
Correct
Consider a point in a structural member that is subjected to plane stress. Normal and shear stress magnitudes
acting on horizontal and vertical planes at the point are Sx = 190 MPa, Sy = 110 MPa, and Sxy = 85 MPa.
Assume .
Construct Mohr’s circle for this state of stress on paper and use the results to answer the questions in the
subsequent parts of this GO exercise.
For this Mohr’s circle, point x, which represents the state of stress on the x face of the stress element, should
appear:
*Part 2
Below and to the left of the circle center.
Above and to the left of the circle center.
Below and to the right of the circle center.
Above and to the right of the circle center.
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For the given state of stress at a point in a structural member, determine the center C and the radius R of
Mohr’s circle.
Answers: C = MPa, R = MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 3
Correct
Determine the principal stresses ( ) for this state of stress.
Answers: MPa, MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 4
Incorrect
Use the coordinates of point x and the center C of the circle to determine the acute central angle. The other
central angle is 180° minus the acute angle.
For this Mohr’s circle, determine the magnitude of the central angle between:
(a) point x and the point representing the principal stress .
(b) point x and the point representing the principal stress .
Answers:
(a) Angle = °,
(b) Angle = °.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
-150 93.94
-56.058 -243.941
-65 *1
-115 *2
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Part 5
Correct
Angles measured in Mohr’s circle are double angles . The orientation of the principal planes in the x–y
coordinate system is defined by an angle . If the acute angle determined in Part 4 is used for , which
sketch correctly defines the orientation of the principal planes?
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*Part 6
Correct
(a) Determine the magnitude of the maximum in-plane shear stress.
(b) Determine the normal stress that acts on planes of maximum in-plane shear stress. Give the stress value
including sign if any.
Answers:
(a) MPa.
(b) MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 7
93.941
-150
6/16/17, 1'29.
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Print by: SALEH HUSSAIN
ENGR 213-001 Sp17 / HW CH 12
*P12.081 GO Multipart
*Part 1
Correct
Consider a point in a structural member that is subjected to
plane stress. Normal and shear stress magnitudes
acting on horizontal and vertical planes at the point are Sx =
190 MPa, Sy = 110 MPa, and Sxy = 85 MPa.
Assume .
Construct Mohr’s circle for this state of stress on paper and use
the results to answer the questions in the
subsequent parts of this GO exercise.
For this Mohr’s circle, point x, which represents the state of
stress on the x face of the stress element, should
appear:
*Part 2
2. Below and to the left of the circle center.
Above and to the left of the circle center.
Below and to the right of the circle center.
Above and to the right of the circle center.
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Correct
For the given state of stress at a point in a structural member,
determine the center C and the radius R of
Mohr’s circle.
Answers: C = MPa, R = MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 3
Correct
3. Determine the principal stresses ( ) for this state of stress.
Answers: MPa, MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 4
Incorrect
Use the coordinates of point x and the center C of the circle to
determine the acute central angle. The other
central angle is 180° minus the acute angle.
For this Mohr’s circle, determine the magnitude of the central
angle between:
(a) point x and the point representing the principal stress .
(b) point x and the point representing the principal stress .
Answers:
(a) Angle = °,
(b) Angle = °.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
-150 93.94
-56.058 -243.941
4. -65 *1
-115 *2
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Part 5
Correct
Angles measured in Mohr’s circle are double angles . The
orientation of the principal planes in the x–y
coordinate system is defined by an angle . If the acute angle
determined in Part 4 is used for , which
sketch correctly defines the orientation of the principal planes?
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5. *Part 6
Correct
(a) Determine the magnitude of the maximum in-plane shear
stress.
(b) Determine the normal stress that acts on planes of maximum
in-plane shear stress. Give the stress value
including sign if any.
Answers:
(a) MPa.
(b) MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 7
93.941
-150
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6. Correct
To determine the normal and shear stresses on the indicated
plane, we must first determine the orientation of
the inclined plane relative to the x face of the stress element.
Determine the magnitude of the counterclockwise
angle between the x face and the inclined plane. Assume Sx =
190 MPa, Sy = 110 MPa, Sxy = 85 MPa, and
.
Answer: °.
the tolerance is +/-2%
*Part 8
Correct
For Mohr’s circle, all angular measures are doubled; therefore,
point n (which represents the state of stress on
the n plane) on Mohr’s circle is rotated counterclockwise from
point x. From the Mohr’s circle that you
constructed on a piece of paper, determine the central angle
between point n and the principal stress
.
Answer: °.
the tolerance is +/-2%
*Part 9
7. 35
45
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Use the center of the circle C, the circle radius R, and the angle
determined in Part 8 to compute:
(a) the normal stress . Give the stress value including sign if
any.
(b) the shear stress . Give the stress value including sign if any.
Answers:
(a) MPa,
(b) MPa.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 10
9. Milli
m
10-3
0.001
Thousandth
Micro
10-6
0.000001
Millionth
150 g = _____________________ mg =
_____________________ g
14 m = _____________________ mm =
_____________________ m
337 l = ______________________ ml =
______________________ l
2. DNA is made up of a phosphate group, an organic base and
a. A sugar
b. A protein
c. A molecule of ATP
d. A Ribosome
3. Which of the following is NOT considered a purine base?
a. Adenine
b. Guanine
c. Cytosine
d. Both A and B
10. 4. In DNA replication, the helix is opened and untwisted by
a. Ligase
b. Helicase
c. Polymerase
d. Primase
5. Okazaki fragments are used to elongate
a. The leading strand toward the replication fork
b. The lagging strand toward the replication fork
c. The leading strand away from the replication fork
d. The lagging strand away from the replication fork
6. If one side of a DNA molecule contains the following
sequence of nucleotides, AGTCCG, its complementary sequence
would be
a. GCCTGA
b. AGTCCG
c. TCAGGC
d. CTGAAT
e. None of the above
7. Transcription is initiated when RNA polymerase binds to
a. A promoter
b. An initiator
c. A transcriptor
d. A codon
8. In the process of transcription
a. DNA is copied into tRNA
b. A polypeptide is formed
c. DNA is replicated
d. mRNA is formed with base sequences complementary to
11. those of DNA
9. True or False: A DNA molecule will have the same amount of
adenine and thymine.
10. True or False: Thymine complements and will bind to
adenine in both DNA and RNA.
11. True or False: The purpose of gel electrophoresis is to
separate molecules of DNA, RNA, etc based on size.
12. True or False: Larger fragments will travel through the gel
faster than smaller fragments.
13. In gel electrophoresis, the DNA will run to the
a. Red anode
b. Red cathode
c. Black anode
d. Black cathode
Name _________________________ Date
__________________
BIO 151L Quiz 6: Heredity
1. Matching: Match the following with the appropriate
definition. (5 points)
____ Genotype a. When there is 1 recessive and 1
dominant allele present
12. ____ Phenotype b. Alternative form of a gene located
on chromosomes
____ Allele c. When either 2 recessive or
dominant alleles are present
____ Homozygous d. An individual’s observable traits
____ Heterozygous e. Genetic makeup of an organism
2. When an allele is expressed regardless of its allelic partner,
we call this allele (2 points)
a. Incomplete
b. Polygenic
c. Recessive
d. Dominant
3. In pea plants, round seeds (R) are dominant to dented seeds
(r). Complete the following mono-hybrid Punnett square and use
this cross to complete questions 4-6. (4 points)
R
r
R
13. r
4. Which of the following genotypes would provide us with a
round seed phenotype? (1 point)
a. RR
b. Rr
c. rr
d. A and B
e. B and C
5. In a genetic cross of two plants that are heterozygous for the
seed shape trait, what fraction of the offspring should have
round seeds? (1 point)
a. 1/4
b. 1/2
c. 3/4
d. All
6. What fraction of the offspring should have dented seeds? (2
points)
a. 1/4
b. 1/2
c. 3/4
d. All
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ENGR 213-001 Sp17 / HW CH 10
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Correct
You will analyze four different beams. For each beam and
loading, determine the beam deflection at point H.
Assume that EI = 1.0 × 107 kip-in.2 is constant for each beam.
Remember that a positive deflection is up and a
positive rotation is counterclockwise.
Here is Beam 1.
Assume LAB=7 ft, LBH=8 ft, MB=45 kip-ft.
For Beam 1, determine the deflection and rotation angle at point
B.
Answers: vB1 = in., rad.
Answer *1: the tolerance is +/-2%
Answer *2: the tolerance is +/-2%
*Part 2
15. Correct
For Beam 1, determine the deflection at point H.
Answer: vH1 = in.
-0.191 -0.004536
-0.627
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the tolerance is +/-2%
*Part 3
Correct
Here is Beam 2
Assume LAB=14 ft, LBC=8 ft, LCH=4 ft, P=15 kips.
For Beam 2, determine the rotation angle at point C.
Answer: rad.
16. the tolerance is +/-2%
*Part 4
Correct
For Beam 2, determine the deflection at point H.
Answer: vH2 = in.
the tolerance is +/-2%
*Part 5
0.00659
0.316
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Here is Beam 3.
Assume LAH=4 ft, LHB=8 ft, w=2.5 kips/ft.
For Beam 3, determine the deflection at point H.
Answer: vH3 = in.
17. the tolerance is +/-2%
*Part 6
Correct
Here is Beam 4.
Assume LHA=6 ft, LAB=18 ft, w=3.0 kips/ft.
For Beam 4, determine the cantilever deflection of the beam at
point H due to the uniformly distributed
load 3.0 kips/ft between point A and point H. This is the
deflection that would be calculated at point H assuming
a fixed support at A.
Answer: vH4a = in.
-0.6266
-0.084
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the tolerance is +/-2%
*Part 7
Correct
For Beam 4, determine the magnitude (report a positive number)
of the bending moment at point A due to the
uniformly distributed load 3.0 kips/ft between point H and point
A.
Answer: MA = kip-ft.
the tolerance is +/-2%
*Part 8
Correct
For Beam 4, determine the rotation angle at point A due to the
moment produced at A by the uniformly
distributed load 3.0 kips/ft between point H and point A.
Answer: rad.
the tolerance is +/-2%
*Part 9
Incorrect
The component of the deflection at H due to the rotation angle
at point A equals the rotation angle times the
distance from point A to point H. Be careful with units and the
sign convention. A downward deflection is
negative, and an upward deflection is positive.