What is the definition of gross axle weight rating?.
what is happening in the mechanical engineering field right now
Answer:
With the ongoing pandemic, businesses have shifted their operations to online platforms while people have been forced to resort to work-from-home lifestyles to prevent the further prevent the spread of the virus.
A glass of water with a mass of 0.45kg at 20∘C is to be cooled to 0∘C by dropping ice cubes at 0∘C into it. The latent heat of fusion of ice is 334kJ/kg, and the specific heat of water is 4.18kJ/kg⋅∘C. The amount of ice that needs to be added is.
By using the concept of heat transfer, we need to add 0.045kg or 45g of ice to the glass of water to cool it from 20∘C to 0∘C.
The heat lost by the water is equal to the heat gained by the ice cubes. We can use the following equation to calculate the heat transfer:
Q = m_w * c_w * ΔT + m_i * L_f
where Q is the heat transfer, m_w is the mass of water, c_w is the specific heat of water, ΔT is the temperature change (20-0 = 20∘C), m_i is the mass of ice, and L_f is the latent heat of fusion of ice.
We know the values of m_w (0.45kg), c_w (4.18kJ/kg⋅∘C), ΔT (20∘C), and L_f (334kJ/kg). We can rearrange the equation to solve for m_i:
m_i = (Q - m_w * c_w * ΔT) / L_f
Substituting the values, we get:
m_i = [(0.45kg) * (4.18kJ/kg⋅∘C) * (20∘C) - 0] / (334kJ/kg
m_i = 0.045kg
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A square aluminum plate 5 mm thick and 150 mm on a side is heated while vertically suspended in quiescent air at 75°c. determine the average heat transfer coefficient for the plate when its temperature is 15°c by two methods: using results from the similarity solution to the boundary layer equations, and using results from an empirical correlation.
By using the boundary layer equation, the average heat transfer coefficient for the plate is equal to 4.87 W/m²k.
Given the following data:
Surface temperature = 15°C
Bulk temperature = 75°C
Side length of plate = 150 mm to m = 0.15 meter.
How to calculate the average heat transfer coefficient.Since we have a quiescent room air and a uniform pole surface temperature, the film temperature is given by:
[tex]T_f=\frac{T_{s} + T_{\infty} }{2} \\\\T_f=\frac{15 + 75 }{2} \\\\T_f = 45[/tex]
Film temperature = 45°C to K = 273 + 45 = 318 K.
For the coefficient of thermal expansion, we have:
[tex]\beta =\frac{1}{T_f} \\\\\beta =\frac{1}{318}[/tex]
From table A-9, the properties of air at a pressure of 1 atm and temperature of 45°C are:
Kinematic viscosity, v = [tex]1.750 \times 10^{-5}[/tex] m²/s.Thermal conductivity, k = 0.02699 W/mk.Thermal diffusivity, α = [tex]2.416 \times 10^{-5}[/tex] m²/s.Prandtl number, Pr = 0.7241.Next, we would solve for the Rayleigh number to enable us determine the heat transfer coefficient by using the boundary layer equations:
[tex]R_{aL}=\frac{g\beta \Delta T l^3}{v\alpha } \\\\R_{aL}=\frac{9.8 \;\times \;\frac{1}{318} \;\times \;(75-15) \;\times \;0.15^3 }{1.750 \times 10^{-5}\; \times \;2.416 \times 10^{-5} } \\\\R_{aL}=\frac{9.8\; \times 0.00315 \;\times \;60\; \times\; 0.003375 }{4.228 \times 10^{-10} }\\\\R_{aL}=1.48 \times 10^{7}[/tex]
Also take note, g(Pr) is given by this equation:
[tex]g(P_r)=\frac{0.75P_r}{[0.609 \;+\;1.221\sqrt{P_r}\; +\;1.238P_r]^\frac{1}{4} } \\\\g(P_r)=\frac{0.75(0.7241)}{[0.609 \;+\;1.221\sqrt{0.7241}\; +\;1.238(0.7241)]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{[0.609 \;+\;1.221\sqrt{0.7241}\; +\;1.238(0.7241)]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{[2.5444]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{1.2630 }[/tex]
g(Pr) = 0.430
For GrL, we have:
[tex]G_{rL}=\frac{R_{aL}}{P_r} \\\\G_{rL}=\frac{1.48 \times 10^7}{0.7241} \\\\G_{rL}=1.99 \times 10^7[/tex]
Since the Rayleigh number is less than 10⁹, the flow is laminar and the condition is given by:
[tex]N_{uL}=\frac{h_{L}L}{k} = \frac{4}{3} (\frac{G_{rL}}{4} )^\frac{1}{4} g(P_r)\\\\h_{L}=\frac{0.02699}{0.15} \times [\frac{4}{3} \times (\frac{1.99 \times 10^7}{4} )^\frac{1}{4} ]\times 0.430\\\\h_{L}= 0.1799 \times 62.9705 \times 0.430\\\\h_{L}=4.87\;W/m^2k[/tex]
Based on empirical correlation method, the average heat transfer coefficient for the plate is given by this equation:
[tex]N_{uL}=\frac{h_{L}L}{k} =0.68 + \frac{0.670 R_{aL}^\frac{1}{4}}{[1+(\frac{0.492}{P_r})^\frac{9}{16}]^\frac{4}{19} } \\\\h_{L}=\frac{0.02699}{0.15} \times ( 0.68 + \frac{0.670 (1.48 \times 10^7)^\frac{1}{4}}{[1+(\frac{0.492}{0.7241})^\frac{9}{16}]^\frac{4}{19} })\\\\h_{L}=4.87\;W/m^2k[/tex]
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A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board. The transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m2°C air = 30°C If the air temperature is 55°C and the transistor case temperature is not to exceed 70°C, determine the amount of power this transistor can dissipate safely. Disregard any heat transfer from the transistor base.
The minimum safety power that is safely dissipated using a transistor of height 0.4cm and diameter 0.06cm is 0.04665
Calculation for the exposed area[tex]\pi DL +\frac{\pi }{4} D^2\\\\Area = 3.14 * 0.6*0.4+\frac{3.14}{4} *0.6^2[/tex]
D = diameter = 0.6cm
Length = height = 0.4cm
Area = 1.0367cm²
minimum safety heat that is dissipatedhA (Ts - Tair)
30 * 1.0367 x 10⁻⁴(70-55)
= 0.04665
The minimum safety power that is safely dissipated is 0.04665W
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b) Consider a large plane wall of thickness L = 0.4 m, thermal conductivity k = 1.8 W/m·K, and surface area A = 30 m2. The left side of the wall is maintained at a constant temperature of T1 = 90°C while the right side loses heat by convection to the surrounding air at
Answer:
A is correct
Explanation:
I took the test
Omar owns a stall selling handmade cosmetics, and wants to launch an e-commerce site. He has lots of experience selling his products in person at markets, but is now hoping to reach more customers online.
Can you advise Omar on how to make both his online and offline business successful?
Answer:
He could put up advertisements all over the town and pay a few websites or search engines to have his company and ads be more common. He should also use some designs and make his company's sign very adequate.
How can we love our country? Not by words but by deeds. - Jose P. Laurel
A person can love their country by deed through the act of helping people and by volunteering in the cleaning out community.
What is this Jose P. Laurel quote about?Jose P. Laurel is known to be a man who emphasis that the love that one has for his or her country is not shown only by words but also by deed
He believe that it is not an occasional virtue people often display. He stated that people need to have unflinching determination to serve their country.
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what is the purpose of placing a large electrolytic capacitor in the output side of a power supply
Answer:
When the AC power is larger than the DC load's needs, a big filter capacitor is typically employed to absorb and store energy, and to give energy to the load when the AC power is lower.
Explanation:
Can you help me with this task/homework.
Need formulas so i can understand your result or anwser.
A conductive loop on the x-y plane is bounded by rho = 2.0 cm, rho = 6.0 cm, φ = 0º and φ = 90º. 2.0 a of current flows in the loop, going in the aφ direction on the rho = 2.0 cm arm. determine h at the origin
select one:
a. 8.4 az (a/m)
b. 4.2 ay (a/m)
c. 8.4 ax (a/m)
d. 4.2 az (a/m)
Answer:
b. 4.2 az (A/m)
Explanation:
b is the answer
Calculate the acceleration of a 2000kg single engine airlane just before take off when the thrust of the engine is 500n?
Answer:
0.25 m/s²
Explanation:
explain the working principles of a rotary engine
Answer:
The rotary engine works on the same basic principle as the piston engine: combustion in the power plant releases energy to power the vehicle. However, the delivery system in the rotary engine is wholly unique. The piston engine performs four key operations: intake, compression, combustion, and exhaust.
Explanation:
In approximately 50 words, describe one thing a professional in an increased demand green construction occupation could do to add to the function, sustainability, and energy efficiency of the construction of a shopping center.
answer:Numbers of green increased demand occupations are growing and include power system operators and dispatchers. There are many green enhanced skill occupations which are being changed; some examples include continuous mining machine operators, electrical engineers, geological sample test technicians, mechanical engineers, and power plant operators, who are all receiving new tasks related to renewable energy generation
The things that the professional in an increased demand green construction occupation can add in the construction of a shopping center include:
Radiant floors.Solar power.Great water recycling.What is a green buidling?It should be noted that a green building simply means a design, construction, or operation that eliminates the negative impact on the climate and natural environment.
In this case, in order to illustrate energy efficiency, it's important to use radiant floors, geothermal system, energy efficient window systems, etc.
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It was a mistake that i put in under 13 of age can you put it for 27
Answer:
ill try to help you :)
Explanation:
Joe maylan an employee of acme company has been sent to do some work in the highland company's main lobby. This job will take two days. Which type of pass should joe be given?
The type of Pass that Joe Maylan should be given is called; Temporary Pass
What is temporary pass?In factories or industries, there are different types of pass given to workers and visitors visit such places on a daily basis. In this case Joe maylan is going to do a job in the company for just 2 days and as such the type of pass he willl get will be a temporary pass.
It will be a temporary pass because it is a document pass issued for short-term use or due to an emergency.
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Explain the difference between a geostationary and a polar orbit, as it relates to satellites
A geostationary orbit is in same direction as the spinning of the earth while polar orbit is along the poles
What is an orbit as used for satellites?Orbit describes the pathway a satellite moves. the pathway is usually circular.
Polar orbit refers to orbits that traces along the poles that is North pole and South pole. owing to the spherical nature of the earth polar orbits are shorter. This allows for a shorter time to complete a revolution.
Geostationary orbit as against the polar orbit , geostationary orbits traces same path as the Earth's spinning. This path os longer and will require more time to complete. Satellites tracing this orbits are launched further away about 36000 km above the earths surface while satellites on polar orbits is shorter about 200 km - 2000 km
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Explain what a structural engineer does?
Explanation:
Structural Engineers create drawings and specifications, perform calculations, review the work of other engineers, write reports and evaluations, and observe construction sites. A Professional Engineer's license is required in order to practice Structural Engineering.
In-------process the hot drawn bar or rod is pulled through the die.
Answer:
Explanation:
he metallic rod is fixed into the dies by using a die holder and then a drawing head is used in which the metallic rod is fixed through a jaw mechanism. And then the bar is stretched and slides between the surfaces of the die
During the design of spherical pressure vessel for space programs, a primary criterion is the mass of the vessel (which determines how much it costs to put it into the orbit). Given the stress in a thin walled spherical vessel is tensile and given by:
Tensile stress in a thin wall spherical shell is given by
σ = ( p r ) /2t
Tensile stressThis is the type of stress that involves pulling out. it is the opposite of compressive stress.
The tensile stress, σ at the circumference of the shell is the hoop stress. The value equals that of pressure acting on the area.
Therefore:
σ * 2πr * t = p * πr^2
where
2πr = circumference of a circle
πr^2 = area of a circle
p = internal pressure
t = thickness
σ * 2πr * t = p * πr^2
σ = ( p r ) /2t
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Water is flowing steadily through a venturi that is oriented vertically. The venturi is attached to a mercury manometer that reads a 14. 3-inch deflection. 14. 3" z 30" 12" 6" a. ) 5 Points. In which direction is the water flowing? Justify your answer
Due to the fact that there is a 14.3inch deflection in the manometer, water is flowing towards the regions that have low pressure.
How does this water flow to low region areas?The fluid that is contained in the manometer is moving towards areas of low pressure. This means they are going to areas with high velocity.
The areas that have low cross sections would flow with a constant rate. This venturi would have low pressure because it has low cross sectional area.
The fluid in the device would then have to move from bottom to top towards the neck of the mercury.
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Which of the following statements about resistance is TRUE?
Resistance resists or opposes the amount of protons flowing through voltage.
Resistance allows the amount of neutrons flowing through a circuit.
Resistance resists or opposes the amount of neutrons and protons flowing through a circuit.
Resistance resists or opposes the amount of electrons flowing through a circuit.
Answer:
I think it's the no 3rd
Explanation:
hope this helps
What was the role of the rotors in the enigma machine?.
Answer:
Implements a reordering of the letters of the alphabet.
Explanation: GIVE ME 5 STARS AND a HEART!!! Those contacts are wired across the rotor so that each contact on the left connects to the contact on the right in some scrambled arrangement. Each rotor, therefore, implements a reordering of the letters of the alphabet, which mathematicians call a permutation.
Explain how the ideal vapour compression refrigerator cycle is an improvement upon the Carnot cycle. Use any two of the problems to explain.
the section of the area to be examined is shown circumscribed by broken lines with circles at
the connecting points.
This question is about Circle Geometry. it evaluates connected and broken lines with respect to circles.
What is Circle Geometry?This refers to the body of knowledge in mathematics that has to do with the various problems associated with the Circle.
In real-world scenarios, circle geometry is used in technologies involving:
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What is the difference between aerospace and aeronautical engineering
Answer:
Aerospace engineering is a broader subject that includes both aircraft and spacecraft studies. Aeronautical engineering focuses more on aircraft design and construction that flies within the Earth's atmosphere.
Explanation:
Aerospace engineering is a vast topic that involves research on both airplanes and spacecraft, further explained in the following paragraph.
Which profession pays better Aerospace or aeronautical engineering?The median annual pay for aerospace engineers is $116,500, according to the US Bureau of Labor Statistics. Aerospace engineers, on the other hand, make $56.01 per hour. According to Glassdoor, the national average compensation for an Aeronautical Engineer in the United States is $80,000.
Aerospace engineering is a vast topic that involves research on both airplanes and spacecraft. Aeronautical engineering is concerned with the design and building of aircraft that fly within the atmosphere.
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When are we going to abandon internal combustion engines?
Answer:
2035
Explanation:
Most car and truck companies say that they will completely get rid of internal combustion engines by 2035.
Q6. Ask for two numbers. If the first one is larger than the second, display the second number first and then the first number, otherwise show the first number first and then the second.
Answer:
Number1 = input("Choose a number: )
Number2 = input("Choose a second number: )
if number1 > number2:
print(number2\nnumber1)
else:
print(number1\nnumber2)
Explanation:
I'm assuming that you want it in python.
Correctly complete the statement below with the appropriate term.
As engineers sketch, they take periodic (_____) to verify that the design maintains the appropriate ratio for the given scale.
Engineers take periodic site measurements to verify the scale conveys true information
Site Measurements
measureants is the amount or extent of something ascertained through use of calibrated instrument called measuring instrument. When measurements are done on site it is called site measurements.
Engineers use the site measurements to scale their sketches hence to ensure the scale is always correct periodic measurements should be taken.
On-site measurements value and sketch measurement value gives the scale which is the ratio, should be maintained always
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Pouring molten aluminum into a mold and allowing it to cool forms:
A)
a stamped part.
B)
a cast part.
C)
an extruded part.
D)
a hydroformed part.
Hi :)
The answer is B. A cast part
How does a cast part form?
Molten material is then poured into a mould cavity that takes the form of the finished part. The molten material then cools, with heat generally until it solidifies into the desired shape.
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Give the other person brainliest, they answered first
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