Answer:
i hope this helps.
Explanation:
they are used for breaking concrete, can be positioned to break vertical and overhead surfaces, allows precisely chip away only specific areas.
An electrical device is insulated on all sides except one face. That face is bonded to a 4mm thick aluminum plate which is cooled by air. The electrical device dissipates 10^4 W m2 The resistance of the joint between the device and aluminum plate is 0.5E-4 m2K W The conductivity of the aluminum is 238 W mK The temperature of the air is 278 K and the convection coefficient from the aluminum plate to the air is 100 W m2K What is the operating temperature of the device
Answer:
t₁ = 378.668 K
Explanation:
From the given information:
The heat dissipated (q) from the electrical device = [tex]10^4 W/m^2[/tex]
The contact resistance between device and aluminium;
(R_{const} ) = 0.5× 10⁻⁴ m² K/W
Conductivity of aluminum (k) = 238 \ W/mK
The thickness of aluminum plate (L) = 0.004 m
Convection coefficient (h) = 100 \ W/m^2 K
Surrounding temperature (t_2) = 278 \ k
According to Fourier's law of heat conduction.
[tex]q = \dfrac { t_1- t_2 }{R_{const} + \dfrac{L}{k} + \dfrac{1}{h} }[/tex]
[tex]10^4 = \dfrac{t_1 - 278}{0.5 \times 10^{-4} + \dfrac{0.004}{238} + \dfrac{1}{100} }[/tex]
[tex]10^4 *( 0.5 \times 10^{-4} + \dfrac{0.004}{238} + \dfrac{1}{100}) = t_1 - 278[/tex]
[tex]100.668 = t_1 -278[/tex]
t₁ = 378.668 K
A 3.0 m thick singly drained normally consolidated clay layer has eo 5 0.89, Cc 5 0.46, and cv 5 3.5 m2 /year. The effective overburden pressure at the middle of the layer is 105.0 kN/m2 . It is proposed to build a large warehouse that is expected to impose a pressure of 50.0 kN/m2 at the ground level.
a. What would the primary consolidation settlement be?
b. If the engineer proposes to preload the site with a pressure of 90.0 kN/m^2, how long should this surcharge be left to ensure there is no postconstruction settlement when the warehouse is built?
Answer:
= 0.9 years ≈ 1 year
Explanation:
A) Determine the primary consolidation settlement
attached below is the detailed solution
primary consolidation = 358.77 mm
B) first calculate the degree of consolidation
looking at the attached graph at u = 46% , Tv = 0.35
using the formula ; Tv = ( Cv*T ) / H^2
where ; Cv = 3.5m^2
Tv = 0.35
H = 3 m ( single drained )
hence T = ( Tv * H^2 ) / Cv
= ( 0.35 * 9 ) / 3.5
= 0.9 years ≈ 1 year
attached below is the remaining part of the solution
Argue the importance to society of incorporating green building into an engineer’s designs, with at least two examples.
A___________combines the function of a video camera and a sound recorder.
Answer:
A video camera with onboard storage(whether is a tape or digital memory) will record sound
inlet and outlet vane angle of turbine
The doorbell of a home requires 10 volts to operate. A transformer is used to connect a 120 v primary circuit within the home to the doorbell. The transformer in the doorbell has 500 turns on the primary coil and supplies the doorbell with 900 mA of current.
Required:
a. Determine whether the transformer features a step-up or step-down design.
b. Calculate the number of turns on the secondary coil.
c. Calculate the current that is drawn from the 120-V household circuit to operate the doorbell in mA.
Answer:
See explanation
Explanation:
a) The transformer must be a step down transformer because the secondary voltage which it supplies is less than the primary voltage.
b) From;
Ns/Np = Es/Ep
Where;
Ns= number of turns in secondary coil
Np= number of turns in primary coil
Es= voltage in secondary coil
Ep= voltage in primary coil
NsEp = EsNp
Ns = EsNp/Ep
Ns = 10 * 500/120
Ns = 42 turns
c) From;
Es/Ep = Ip/Is
EsIs = EpIp
Ip = EsIs/Ep
Ip = 10 * 900 * 10^-3/120
Ip = 75 mA
____________ are calibrated to deliver one fixed volume and are ____________ than ______________. Select one: a. Transfer pipets; less accurate; measuring pipets b. Transfer pipets; more accurate; measuring pipets c. Measuring pipets; more accurate; transfer pipets d. None of these answers is correct. e. Measuring pipets; more precise; transfer pipets
Answer:
b. Transfer pipets; more accurate; measuring pipets.
Explanation:
Transfer pipets can be defined as an ungraduated or graduated disposable plastic instrument which are typically used in science laboratories to transfer or deliver liquids that are small in volume (microliters) . Also, they are generally being referred to as chemical
droppers, teat pipets, eye droppers, pasteur pipets, or droppers. It is made up of an ultra-clear long, slender tube with low density polyethylene (LDPE) and an integral molded bulb. The molded bulb allows a fixed volume of the desired liquid to be dispensed (transfered) or aspirated through compression and relaxation.
Hence, transfer pipets are calibrated to deliver one fixed volume and are more accurate than measuring pipets because of its long, slender tube which limits errors.
Transfer pipets are measurement pipets since they are calibrated to provide a specific volume.
Transfer pipets and Measuring pipets
Transfer pipets have been ungraduated as well as graded disposable plastic instruments that were already commonly used during research labs to transmit as well as distribute small-volume liquids.
Combining compression as well as relaxation, the molded bulb permits a set volume of such necessary fluid material to be administered as well as inhaled.
Thus the response above is correct.
Find out more information about transfer pipets here:
https://brainly.com/question/10951729
why data structure is important
Answer:
Data structures are important as it allows the user to insert, update, arrange, rearrange, delete, and retrieve data in an efficient manner, from the database. And to accomplish the said tasks algorithms are used. It is used to manipulate the stored data within the database in the required manner. …
Explanation:
hope you like my ans
1. The hull of the space shuttle consists of ceramic tiles bonded to an aluminum skin. Discuss the design requirements of the shuttle hull that led to the use of this combination of materials. What problems in producing the hull might the designers and manufacturers have faced
Answer:
Follows are the solution to the given question:
Explanation:
In the environment of the piles of earth, its spacecraft faces extreme temperatures:
Therefore, to prevent satellite build sustainability, a temperature control system must be used.
Its skin must be rather permeable in physiological terms.
Its shuttle's surface should have adhered to both the material well.
Whether it gets broken, it ought to be easy to repair.
All tile mostly on the cutter is composed of silicon dioxide particles, that are bonded and create a tile of very low density.
Its heat transfer is so small that even a person may hold a burning hot side on one side of the tile.
Skin that uses a rubber resin to ensure that perhaps the powers may not release the cutting that heat-treated will then the internal body.
The design requirements that led to the combination of ceramic tiles and aluminium materials for the hull of shuttle space are; discussed below.
The space shuttle experiences extreme temperatures during re-entry into the earths atmosphere. Thus, as a result, a thermal protection system must be provided to help prevent damage of the shuttle structure.
Therefore, the skin must be made up of material that has an exceptionally low thermal conductivity and also the material must be able to be firmly attached to the skin and also be able to be easily repaired in case of any damage.
Secondly, the tiles used on the space shuttle will have to be composed of silica fibers that are bonded together to generate a ceramic of low density. The thermal conductivity of the ceramic would have to be low such that if you touch one end while the other is very hot, you will not feel the hotness.
Now, the tiles will be attached to the shuttle skin with the aid of a rubbery polymer which ensures that the forces don't break the tile loose which will then expose the underlying skin to high temperatures.
Read more about some physical properties of ceramic at; https://brainly.com/question/14215109
what is in gorilla glue
Answer:
glue
Explanation:
Guess the output of this code:
print( (3**2)//2 )
Like guess guess or actually solve ?
cause I think its 121
A farmer wants to buy a 10 kg bag of fertilizer (organic soil). They have the choice between two merchants. Merchant A sells the 10 kg bag for $10 and the bag indicates that the fertilizer is completely dry. Merchant B sells the 10 kg bag for 8$, and the bag indicates that the fertilizer has a water content of 20%. If the farmer can only use the solid constituents of the bag, which merchant has the better deal?
Answer:
Since the farmer wants to buy a 10 kg bag of fertilizer, he should buy it from merchant A. However, Merchant A and B are selling at the same price for a unit value. In other words, Both Merchant A and B are selling 1kg of dry fertilizer for $1.
Explanation:
Which merchant has the better deal means which merchant offers the farmer a better deal.
For Merchant A, 10 kg bag = $10
meaning it contains a real 10 kg bag of dry fertilizer which the farmer can use without losing any Kg to drying.
While for Merchant B, 10 kg bag = $8
where the 10kg = 80% dry fertilizer + 20% water content
But the farmer can only use the solid constituents of the bag which means,
Merchant B is giving 80/100 x 10Kg of dry fertilizer for $8
That is, 8kg for $8
Since the farmer wants to buy a 10 kg bag of fertilizer, he should buy it from merchant A. However, Merchant A and B are selling at the same price for a unit value. In other words, Both Merchant A and B are selling 1kg of dry fertilizer for $1.
Drag the 100 n block onto the diaphragm spring and use the ruler to measure the compression how many meters has the spring compressed?
An ideal Rankine cycle with reheat uses water as the working fluid. The conditions at the inlet to the first-stage turbine are p1 5 2500 lbf/in.2, T1 5 10008F. The steam is reheated at constant pressure p between the turbine stages to 10008F. The condenser pressure is 1 lbf/in.2 (a) If p/p1 5 0.2, determine the cycle thermal efficiency and the steam quality at the exit of the second-stage turbine.
Answer:
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Explanation:
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In a vehicle with front disc brakes, the vehicle pulls to the left when braking. What causes this?
A. Seized left brake caliper piston
B. Collapsed left brake line hose
Environmental engineers monitor the progress of improvement programs by inspecting industrial and municipal facilities for regulation compliance.
True or False?
true
the answer to this question is true
In your role, you are responsible for making sure that delivery trucks depart from the building on time. When a truck arrives late, the company must pay to upgrade the shipping method so the customer receives the order as expected. Prior to the trucks departure, you are responsible for completing a quality inspection to ensure none of the customer orders damaged. One day, you encounter a situation where a delivery will be late if you perform the quality inspection on the truck. What decision do you make and why?