Answer:
156.0 ksi
Explanation:
The formula of compressive strength is CS = F / A
where F is the force or load while A is the cross-sectional area
Given the inertia Ag = 35.1 in^4 , which is less than 40, the steel has a short column.
E = 29000 ksi
L = 12ft
r = 2.69 in
therefore;
CS = π^2 E / (kL^2/r)^2
= π^2 29000 / (0.8 x 12^2 / 2.69)^2
= 286292.756 / 1834.4089 = 156 ksi
Assignment V: Discussion Forum-Take-Aways 33 unread replies.33 replies. During the semester, we have studied a wide range of topics related to behavior in organizations. Each module in the course began with a survey that examined your assumptions regarding its associated domain area. Material for that module either confirmed or challenged your assumptions. For this discussion forum (which is graded), choose one course module where your assumptions were confirmed and one where your assumptions were challenged. For the module where your assumptions were confirmed: Explain how and why they were confirmed and list three specific ways in which your knowledge of organizations was enhanced--that is, three take-aways For the module where your assumptions were challenged: explain how and why they were challenged and list three specific ways in which your knowledge of organizations was enhanced--that is, three take-aways"leadership"
diffusion welding process in welding of. Ti–6Al–4V to Ti–6Al–6V–2Sn
Answer:
2
Explanation:
Which of the following identifies how an engineer includes interior designs?
O An internal view is used by scalinga drawing to the exact dimensions.
OA crisscross replica is made of the design prototype to show the interior view.
O An internal design is not necessary until a machinist has created the design.
OAsketch is included to show interior designs using a technique called sectioning.
Answer:
i know this one well hypotheticly what if i where to say it was 0 b
Answer:
A sketch is included to show interior designs using a technique called sectioning.
Explanation:
A coil consists of 200 turns of copper wire and have a cross-sectional area of 0.8 mmm square.The mean length per turn is 80 cm and the resistivity of copper is 0.02μΩm at normal working temperature.Calculate the resistance of the coil
Answer:
The resistance of the coil is 4 Ω.
Explanation:
The resistance (R) of the coil can be calculated using the following equation:
[tex]R = \frac{\rho L}{A}[/tex]
Where:
ρ: is the resistivity of copper = 0.02x10⁻⁶ Ωm
L: is the length of the coil
A: is the cross-sectional area = 0.8 mm² = 8x10⁻⁷ m²
The length of the coil is given by:
[tex] L = 200 turn* 80 cm/turn = 16000 cm = 160 m [/tex]
Now, the resistance is:
[tex]R = \frac{\rho L}{A} = \frac{0.02 \cdot 10^{-6} \Omega m*160 m}{8 \cdot 10^{-7} m^{2}} = 4 \Omega[/tex]
Therefore, the resistance of the coil is 4 Ω.
I hope it helps you!
Which of these methods is likely to make a product design more suitable for mass production?
OA. using standardized parts
OB. using highly customized parts
c. using parts that can fit only in one product
D. using parts that have a single function
Answer:
using standardized parts
Explanation:
Which part of Johnson’s speech is MOST effective in persuading the audience to help build the Great Society?
Answer:
the total elimination of poverty and racial injustice.
3. Which of the following statements is false?
a. The condenser is normally mounted just in front of the radiator.
b. The receiver/dryer is a storage tank for the liquid refrigerant from the condenser.
c.An accumulator is not used in a system with a receiver/dryer.
d All of the above
Answer: c.An accumulator is not used in a system with a receiver/dryer
Explanation:
In a refrigeration system, a condenser is used to transfer heat and this occurs from the refrigerant to the air or water.
Then, the refrigerant then condenses to liquid when the hear has been transferred.
We should note that the condenser is normally mounted in front of the radiator. The receiver/dryer is a storage tank for the liquid refrigerant from the condenser.
The statement that an accumulator is not used in a system with a receiver/dryer is not true. This is because, the accumulator gives protection to the compressor which helps to prevent the failure of the compressor.
Therefore, the answer is C.
How large a force is required to accelerate a 1300 kg car from rest to a speed of 20 m/s in a distance of 80 m?
F=m*a
F=80*20
F =1600 ans"
Answer: basically we are asked to find it's force and the formula that helps us to find force is Force= Mass× Acceleration
so let's put out the given and what we need to find
GIVEN. Solution
F=m.a
Mass= 1300. F=1300kg×20m/s
speed (Acceleration)=20m/2. F=26000Kg.m/s
Force=? F=26000N
N stands for Newton and the reason that it comes Newton is because it is the SI-unit of Force and the result of kg×m/s.
A 1/20 scale model of a wing is used to determine forces on the actual airplane. the 1/20 scale refers to the:_____
a. lengths.
b. velocity.
c. forces.
d. Reynolds number.
e. all of the above.
Answer:
A Lengths
Explanation:
you make a model to show an object too large to test and too expensive to test
Answer:
a. lengths.
Explanation:
The scale can be said to be a representation of the model as regards the prototype. The prototype is the machine. Using a 1:20 scale tells us that the model is 1/20 times the magnitude of the length of this machine. So if the length of the side of the machine = 20m then we would have the length of the model as 1. (1/20x20 = 1)
Therefore the scale is the length and option a is correct
Ans. 18).
A push of 180 N and pull of 350 N act simultaneously at a point. Find the resultant of the
forces. if the angle between them (135)
Explanation:
R = √(A²+B²–2ABCos(x°))
x⁰ = 180–135
x° = 45°
R = √(350²+180²–2(350(180))Cos(45)))
R = 256.524
solve for the unknown values in the circuit in figure 3-9, NEED ANSWERS ASAP
Answer:
25 V, 50V, 75V respectively.
I hope it will be useful.
The insulation resistance of a motor operated by an electronic drive is to be tested using a megger. What precaution should you take? Why?
A 60-Hz 3-phase induction motor is required to drive a load at approximately 850 rpm. How many poles should the motor have
Answer:
8 poles
Explanation:
Given
[tex]Frequency, f = 60Hz[/tex]
[tex]Speed, n_s = 850rpm[/tex]
Required
Calculate the number of poles the motor should have?
To solve this question, we make use of synchronous angular velocity formula
[tex]n_s = \frac{120f}{P}[/tex]
Where
[tex]P = Number\ of\ Poles[/tex]
Substitute values for [tex]n_s[/tex] and f in [tex]n_s = \frac{120f}{P}[/tex]
[tex]850 = \frac{120 * 60}{P}[/tex]
[tex]850 = \frac{7200}{P}[/tex]
Multiply both sides by P
[tex]P * 850 = \frac{7200}{P} * P[/tex]
[tex]P * 850 = 7200[/tex]
Divide both sides by 850
[tex]\frac{P * 850}{850} = \frac{7200}{850}[/tex]
[tex]P = \frac{7200}{850}[/tex]
[tex]P = 8.47058823529[/tex]
However, the number of poles must be an integer.
So:
[tex]P = 8[/tex]
When designing a current-gain-stabilized voltage-divider bias circuit such as this one, the rule of thumb used for the emitter voltage is ________.
Answer:
Ve = Vcc/10
Explanation:
The rule of thumb that is used for emitter voltage while designing this is
Ve = Vcc / 10
Which definition best describes a regulator?
Oamechanical deice that presses gas into a smal container
O an incompressibie iquid ike oil or water
O a device that helips control the fow of a fuid
O adevice that coilects liquid in a hydraulic system and keeps it under pres
Answer:
d
Explanation:
it measures things so i think that is the answer
Answer:
it would be d
Explanation:
i hope this helps
How much heat is lost through a 3’× 5' single-pane window with a storm that is exposed to a 60°F temperature differential?A. 450 Btu/hB. 900 Btu/hC. 1350 Btu/hD. 1800 Btu/h
Answer:
A. 450 btu/h
Explanation:
We solve this problem by using this formula:
Q = U x TD x area
U = U value of used material
TD = Temperature difference = 60°
Q = heat loss
Area = 3x5 = 15
We first find U
R = 1/u
2 = 1/U
U = 1/2 = 0.5
Then when we put these values into the formula above, we would have:
Q = 0.5 x 15 x 60
Q = 450Btu/h
Therefore 450btu/h is the answer
Suppose that the following eight jobs must be scheduled through a car repair facility (repair times are shown in days): Car Repair (Processing) Time Due Date A 3 11 B 10 9 C 7 10 D 12 8 E 4 17 F 15 35 G 8 13 H 9 23 Use the information in the above table to answer these questions (you may use a s/heet if you wish): What car is repaired the latest (the most past its due date) if an SPT ( shortest processing time) sequence is to be obeyed? What car is repaired the latest (the most past its due date ) if an EDD (earliest due date) scheduling sequence is to be obeyed?
Answer:
The answer is "F".
Hope this helped!
A rotating shaft is subjected to a steady torsional stress of 13 ksi and an alternating bending stress of 22 ksi.
(A) Find the yielding factor of safety using the distortion energy theory.
(B) Find the fatigue factor of safety using the Goodman criterion. A shaft has the properties of Se= 35 ksi, Sy = 60 ksi, and Sut = 85 ksi.
Answer:
A) б1 = 28 ksi and б2 = -6.02 ksi
B) 1.25
Explanation:
Given data :
Torsional stress = 13 ksi
Alternating bending stress = 22ksi
A) determine yielding factor of safety according to the distortion energy theory
б1,2 = [tex]\frac{22}{2}[/tex] ± √(22/2)² + 13²
= 11 ± 17
therefore б1 = 28 ksi hence б2 = -6.02 ksi
B) determine the fatigue factor of safety
with properties ; Se = 35ksi, Sy = 60 ksi, Sut = 85 ksi
( б1 - б2 )² + ( б2 - б3 )² + ( б3 - б1 )² ≤ 2 ( Sy / FOS ) ²
( 28 + 6.02 ) ² + ( 6.02 - 0 )² + ( 0 - 28 )² ≤ 2 ( 60 / FOS ) ²
solving for FOS = 1.9
Next we can determine FOS with the use of Goodman criterion
бm / Sut + бa / Se = 1 / FOS
= 0 / 85 + 28/35 = 1 / FOS
making FOS the subject of the equation ; hence FOS = 1.25
Training is a way for employers to provide
to enable employees to protect themselves and others from injuries
Answer:
Tools.
Explanation:
The Occupational Safety and Health Administration (OSHA) is a federal agency saddled with the responsibility of assuring and ensuring safe and healthy working conditions for employees by setting and enforcing standards, providing education, trainings and assistance to various organizations.
According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment e.g masks (respirators), ear plugs, safety boots, gloves, helmet, etc. are very important and are essentially to be used by employees (workers) while working in a hazard prone environment or industries. Therefore, all employers of labor are required to provide tools and ensure that their employees properly use those tools, as well as abide by other safety precautions and standards.
Hence, training is a way for employers to provide tools to enable employees to protect themselves and others from injuries.
A buffer amplifier with a gain of 1 V/V has an input resistance of 1 M and an output resistance of 20. It is connected between a 1-V, 200-k source and a 100-Ω load. What load voltage results? What are the corresponding voltage, current, and power gains (in dB)?
Answer:
The Load Voltage is 0.7 v
the corresponding voltage is - 3.098 dB
the corresponding current gain is 78.48 dB
the corresponding POWER gain is 37.7 bB
Explanation:
Given the diagram;
in the circuit of 1 MΩ and 200 KΩ are in series
also 20 Ω and 100 Ω are in series;
so
V₀ = [ (1V×1MΩ)/(1MΩ+200KΩ)] × [ (1V×100Ω)/(100Ω+20Ω)]
V₀ = 0.7 v
The Load Voltage is 0.7 v
Now considering the formula to find Voltage Gain
A_v = V₀ / V_i
we substitute
A_v = 0.7 / 1
A_v = 0.7 V/V
to convert to dB
A_v (dB) = 20logA_v
= 20log0.7
= - 3.098 dB
the corresponding voltage is - 3.098 dB
To determine the current gain
A_i = V₀/100Ω × 1.2MΩ/V_i
= 0.7/100Ω × 1.2MΩ/1
= 8400 A/A
to convert to dB
A_I (dB) = 20logA_I
= 20log8400
= 78.48 dB
the corresponding current gain is 78.48 dB
To determine the power gain
P_G = V₀²/100Ω × 1.2MΩ/V_i²
= 0.49/100Ω × 1.2MΩ/1
= 5880 W/W
to convert to dB
P_G (dB) = 10logP_G
= 10log5880
= 37.7 bB
the corresponding POWER gain is 37.7 bB
For a turbine, it is seen that work is done by the fluid at the expense of its enthalpy. Explain with mathematical proof.
Answer:
The work of the turbine is done at the expense of the enthalpy of the fluid.
Explanation:
Ideally speaking, a turbine is a steady-state devices that has no heat interactions and generates works at the expense of enthalpy. By the First Law of Thermodynamic, we have the following definition for steady-state conditions: (all energy components are measured in joules)
[tex]E_{in} - E_{out} + E_{gen} = 0[/tex] (1)
Where:
[tex]E_{in}[/tex] - Inlet energy.
[tex]E_{out}[/tex] - Outlet energy.
[tex]E_{gen}[/tex] - Generated energy.
Generated energy is associated with endothermic and exothermic chemical reactions and fission processes in radioactive elements and isotopes. Since fluids used in turbines are usually inert, the generated energy is zero and each remaining componets of the expression are defined:
[tex]E_{in} = U_{g,in}+K_{in}+H_{in}[/tex] (2)
[tex]E_{out} = U_{g,out}+K_{out}+H_{out}+W_{out}[/tex] (3)
Where:
[tex]U_{g,in}[/tex], [tex]U_{g,out}[/tex] - Inlet and outlet gravitational potential energies.
[tex]K_{in}[/tex], [tex]K_{out}[/tex] - Inlet and outlet translational kinetic energies.
[tex]H_{in}[/tex], [tex]H_{out}[/tex] - Inlet and outlet enthalpies.
[tex]W_{out}[/tex] - Energy generated by the turbine.
Usually, turbines at steady state does not report significant changes in translational and gravitational potential energies and (2) and (3) can be reduced into this form:
[tex]E_{in} = H_{in}[/tex] (2b)
[tex]E_{out} = H_{out}+W_{out}[/tex] (3b)
And we find the following equation of work by substituting on (1):
[tex]W_{out} = H_{in}-H_{out}[/tex] (4)
In a nutshell, the work of the turbine is done at the expense of the enthalpy of the fluid.
Two identical billiard balls can move freely on a horizontal table. Ball a has a velocity V0 and hits balls B, which is at rest, at a point C defined by θ=45°. knowing that the coefficient of restitution between the two balls is e=0.8 and assuming no friction , determine the velocity of each ball after impact?
Answer:
Velocity of ball B after impact is [tex]0.6364v_0[/tex] and ball A is [tex]0.711v_0[/tex]
Explanation:
[tex]v_0[/tex] = Initial velocity of ball A
[tex]v_A=v_0\cos45^{\circ}[/tex]
[tex]v_B[/tex] = Initial velocity of ball B = 0
[tex](v_A)_n'[/tex] = Final velocity of ball A
[tex]v_B'[/tex] = Final velocity of ball B
[tex]e[/tex] = Coefficient of restitution = 0.8
From the conservation of momentum along the normal we have
[tex]mv_A+mv_B=m(v_A)_n'+mv_B'\\\Rightarrow v_0\cos45^{\circ}+0=(v_A)_n'+v_B'\\\Rightarrow (v_A)_n'+v_B'=\dfrac{1}{\sqrt{2}}v_0[/tex]
Coefficient of restitution is given by
[tex]e=\dfrac{v_B'-(v_A)_n'}{v_A-v_B}\\\Rightarrow 0.8=\dfrac{v_B'-(v_A)_n'}{v_0\cos45^{\circ}}\\\Rightarrow v_B'-(v_A)_n'=\dfrac{0.8}{\sqrt{2}}v_0[/tex]
[tex](v_A)_n'+v_B'=\dfrac{1}{\sqrt{2}}v_0[/tex]
[tex]v_B'-(v_A)_n'=\dfrac{0.8}{\sqrt{2}}v_0[/tex]
Adding the above two equations we get
[tex]2v_B'=\dfrac{1.8}{\sqrt{2}}v_0\\\Rightarrow v_B'=\dfrac{0.9}{\sqrt{2}}v_0[/tex]
[tex]\boldsymbol{\therefore v_B'=0.6364v_0}[/tex]
[tex](v_A)_n'=\dfrac{1}{\sqrt{2}}v_0-0.6364v_0\\\Rightarrow (v_A)_n'=0.07071v_0[/tex]
From the conservation of momentum along the plane of contact we have
[tex](v_A)_t'=(v_A)_t=v_0\sin45^{\circ}\\\Rightarrow (v_A)_t'=\dfrac{v_0}{\sqrt{2}}[/tex]
[tex]v_A'=\sqrt{(v_A)_t'^2+(v_A)_n'^2}\\\Rightarrow v_A'=\sqrt{(\dfrac{v_0}{\sqrt{2}})^2+(0.07071v_0)^2}\\\Rightarrow \boldsymbol{v_A'=0.711v_0}[/tex]
Velocity of ball B after impact is [tex]0.6364v_0[/tex] and ball A is [tex]0.711v_0[/tex].
Which option shows the three main steps of the design process?
O sketch ideas, formulate a plan, create a prototy pe
O identify the need, create a concept, provide a product
O find an engineer, outsource manufact uring, create a prototype
O create a prototype, test at trade shows, create the product on large scale
Answer:
O 2 no cap 192882822882282
Answer:
B.) Identify the need, create a concept, provide
Explanation:
edge
Which step of the critical thinking process determines the main idea to be understood in order for the information or data to make sense?
A-implication
B-purpose
C-assumption
D-concept
You may turn left on a light that is green, however, you must yield the right-of-way if other traffic is approaching from the opposite direction
What is common between fractions and ratios
How many gallons of 25% concentrated due will Lucy need to add to the 15% concentrated dye to make a batch with a concentration of 23%?
Complete question is;
Lucy works for a company that manufactures liquid dyes for fabric. She currently wants to mix up some 23%-concentrated teal dye. She has 16 gallons of 15%-concentrated teal dye, as well as plenty of 25%-concentrated teal dye. How many gallons of the 25%-concentrated teal dye will Lucy need to add to the 15%-concentrated teal dye to make a batch with a concentration of 23%?
Answer:
64 gallons
Explanation:
We are given;
Quantity of 15%-concentrated teal dye = 16 gallons
Let the number of gallons of 25%-concentrated teal dye needed to add to make the batch with a concentration of 23% be represented as x.
Thus;
(15% × 16) + (25%)x = 23%(16 + x)
Multiply each term by 100 to give;
(15 × 16) + 25x = 23(16 + x)
240 + 25x = 368 + 23x
Rearranging, we have;
25x - 23x = 368 - 240
2x = 128
x = 128/2
x = 64
Air fl ows isentropically through a duct. At section 1, the pressure and temperature are 250 kPa and 1258C, and the velocity is 200 m/s. At section 2, the area is 0.25 m2 and the Mach number is 2.0. Determine (a) Ma1; (b) T2; (c) V2; and (d ) the mass fl ow.
The correct temperature is 125°C
Answer:
A) M_a1 = 0.5
B) T2 = 232.17 K
C) V2 = 611 m/s
D) m' = 187 kg/s
Explanation:
We are given;
Pressure; P1 = 250 kPa
Temperature; T1 = 125°C = 398 K
Speed; v1 = 200 m/s
Area; A2 = 0.25 m²
M_a2 = 2
A) Formula for M_a1 is given by;
M_a1 = v/a1
Where;
v is speed
a1 = √kRT
k is specific heat capacity ratio of air = 1.4
R is a gas constant with a value of R = 287 J/kg·K
T is temperature
Thus;
M_a1 = 200/√(1.4 × 287 × 398)
M_a1 = 200/399.895
M_a1 = 0.5
B) To find T2, let's first find the Stagnation pressure T0
Thus;
T0/T1 = 1 + ((k - 1)/2) × (M_a1)²
T0 = T1(1 + ((k - 1)/2) × (M_a1)²)
T0 = 398(1 + ((1.4 - 1)/2) × (0.5)²)
T0 = 398(1 + (0.2 × 0.5²))
T0 = 398 × 1.05
T0 = 417.9 K
Now,similarly;
T0/T2 = 1 + ((k - 1)/2) × (M_a2)²
T2 = T0/[(1 + ((k - 1)/2) × (M_a2)²)]
T2 = 417.9/(1 + (0.2 × 2²))
T2 = 417.9/1.8
T2 = 232.17 K
C) V2 is gotten from the formula;
T0 = T2 + (V2)²/(2C_p)
Cp of air = 1005 J/Kg.K
Thus;
V2 = √(2C_p)[T0 - T2]
V2 = √((2 × 1005) × (417.9 - 232.17))
V2 =√373317.3
V2 = 611 m/s
D) mass flow is given by the formula;
m' = ρA2•V2
Where;
ρ is Density of air with an average value of 1.225 kg/m³
m' = 1.225 × 0.25 × 611
m' = 187 kg/s
Gordon Gould has been forced to fight for his claim to the invention of the laser because:_________.a. he was forced out of the company that he and his best friend started. b. he thinks lawsuits are fun. c. he loves the technology and wants to be a part of it. d. he failed to follow some important scientific conventions.
Answer:
d
Explanation:
he failedto follow some important scientific conventions
In a List of Positive Integers, Set MINIMUM to 1. For each number X in the list L, compare it to MINIMUM. If X is smaller, set MINIMUM to X.” Read this STATEMENT very carefully and Answer the below Questions.
A. Will this Algorithm RUN?? Yes or No with a justification
B. Will X Replace Any Value or Not?
Answer:
A. Yes, it will run
B. X will not replace any value
Explanation:
A. Will it run?
First, the algorithm can be interpreted in python as follows:
#Set Minimum to 1
MINIMUM = 1
#For every element X in the list L
for X in L:
#If current element X is less than MINIMUM
if X < MINIMUM:
#Set MINIMUM to X
MINIMUM = X
#Print MINIMUM
print(MINIMUM)
The algorithm will run without error because it follows the right sequence and has no syntax error
B. Will X replace any value?
No, it won't
The smallest positive integer is 1.
So, setting the MINIMUM to 1 means that the value of X in the list will not replace the MINIMUM because the MINIMUM has already been set