Time required to melt paraffin is [tex]t_{m} =4660s = 1.29 hours[/tex]
What is liquefaction?Liquefaction is the term for the phase transitions from solid to liquid (melting) and from gas to liquid (condensation, respectively). The temperature and pressure at which a solid transforms into a liquid is known as the melting point (sometimes referred to as the liquefaction point).The time taken to liquify the paraffin,
[tex]T= 27.4^{o}[/tex]
so, [tex]\frac{T-T_{0} }{T-T_{1} } = exp(\frac{-PidLb}{mxcp} )[/tex]
Here, the Reynolds number is donated by [tex]R_{eD}[/tex].
So, [tex]R_{eD}[/tex] = [tex]\frac{4m}{pi*D*m}[/tex]= [tex]\frac{4*0.1}{pi*0.025*467*10^{-6} }[/tex]
Therefore, [tex]R_{eD}[/tex] = 10,906
h = ?
Given, water flow rate = 0.1 kg/s
so, [tex]h = \frac{NneudK}{D} =\frac{k}{D} *00.023*R_{eD}^{4/5}* P^{0.3} _{o}[/tex]
=[tex]\frac{0.653}{0.025} *0.023*10906^{4/3} *2.99^{0.3}[/tex]
therefore, 'h' = [tex]1418\frac{w}{m^{2}* k}[/tex]
so, [tex]T_{0} =T-(T-T_{i})exp(\frac{piDlh}{mcp} )[/tex]
by substituting, we get
[tex]T_{0}=27.4-(27.4-60)exp(\frac{-pi*0.25*3*1418}{0.1*4185})[/tex]
Therefore, [tex]T_{0}=42.17^{o}[/tex]
As per the balance energy equation, we get
[tex]q=h_{i} C_{p} (T_{i} -T_{0} )=0.1*4185*(60-42.17) = 7500 watts[/tex]
with the help of balance energy, we can calculate the time required to melt paraffin
so, [tex]q*T_{m} = P_{v}h_{s} f[/tex]
[tex]=PL(wH-\frac{pid^{2} }{4})h_{s} f[/tex]
so, [tex]T_{m} =(770*3)* \frac{(0.25*\frac{0.25^{2} -pi}{4} *0.025)^{2}}{750} h_{s} f[/tex]
Therefore, time required to melt paraffin is [tex]T_{m} =4660 seconds= 1.29 hours[/tex]
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kalpakjian and schmid, problem 5.70. a 75-mm thick square plate and a right circular cylinder with a radius of 100 mm and height of 50 mm each have the same volume. if each is to be cast using a cylindrical riser, will each part require the same size riser to ensure proper feeding? explain.
Here, it is evident that a square plate requires more time than a cylinder. Therefore, a larger riser will be needed, and there will be a range of sizes for the riser.
We are aware that the time required for solidification equals C(volume/area), where C is a constant.
volume of cylinder = r2h where r = 100mm = 0.1 m and h = 50mm = 0.05 m
Cylinder volume = (0.1)
²×0.05 =0.00157m³
the cylinder's total surface area is equal to 2r² + 2rl (0.1)
Time taken for the cylinder = C(Volume/Area) = C(0.00157/0.0942) = (2.78 10⁻⁴)C since 2 + 2(0.1)(0.05) = 0.0942 m2.
For a square plate, h = 75 mm = 0.075m, l = b = x, and x = 0.144m. Accordingly, l = b = 0.144m, and the volume of the square plate is equal to 0.0157 m³ [A/C to inquiry].
Total surface area is equal to 2 (lb + bh + hl) (0.144)
Time taken for a square plate equals C(volume/area) = C(0.00157/0.0847) = (3.43 10⁻⁴)C because 2 + 4 (0.144) (0.075) = 0.0847 m³
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a tidal power plant has a pool area of 26 km2 . the tide has a range of 8.5 m. how much energy (kwh) is generated in one cycle of filling and emptying the tidal impoundment, if the turbinegenerator efficiency is 75%?
3.676 x [tex]10^{6}[/tex] kWh of energy generated in one cycle of filling and emptying the tidal impoundment.
Energy generated in one filling (or emptying) process is
Energy = [tex]\frac{1}{2}[/tex] ρgA([tex]R^{2}[/tex] – [tex]r^{2}[/tex]), Joules
Where,
ρ = density of sea water = 1025 kg/[tex]m^{3}[/tex]
g = acceleration due to gravity = 9.81 m/[tex]s^{2}[/tex]
A = basin area = 26 km2 = 26 x [tex]10^{6}[/tex] [tex]m^{2}[/tex]
R = minimum head for turbine operation = 3m
E = 1/2 x 1025 x 9.81 x 26 x 106 x 135 J
= 1,76,46,963.75 x [tex]10^{6}[/tex] J
= (1,76,46,963.75 x [tex]10^{6}[/tex]) / (1000 x 3600) kWh
= 4.901 x [tex]10^{6}[/tex] kWh
But the theoretically available tidal energy in one filling process has to be multiplied by 73% or 0.73 to get actual energy generated by the turbine generator.
Therefore, actual energy generated, [tex]E_{actual}[/tex]is given by
[tex]E_{actual}[/tex] = 75% of [tex]E_{theoretical}[/tex]
= 0.75 x 4.901 x [tex]10^{6}[/tex]
= 3.676 x [tex]10^{6}[/tex] kWh
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fairings are attached to the front and back of a cylindrical body to make it look more streamlined. what is the effect of this modification on the (a) friction drag, (b) pressure drag, and (c) total drag? assume the reynolds number is high enough so that the flow is turbulent for both cases.
The correct answer is (a) friction drag . therefore the correct option is the option (b).
Friction drag, also referred to as skin friction drag, is resistance felt by an object traveling through a fluid as it comes into contact with its surface. It grows with the square of the velocity and is exactly proportional to the area of the surface in contact with the fluid. For connected flows (where there is no separation), frictional drag is significant and is correlated with the exposed surface area. For separated flows, pressure drag is crucial, because it is correlated with the body's cross-sectional area. The air blowing directly above the Earth experiences frictional drag.
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assign is teenager with true if kidage is 13 to 19 inclusive. otherwise, assign is teenager with false.
We use C programming to assign is teenager with true if kidage is 13 to 19 inclusive.
What is C programming?
With a static type system and support for structured programming, lexical variable scope, and recursion, C is an imperative procedural language. It was intended to be compiled, with minimal runtime support, to offer low-level memory access and language constructs that efficiently map to machine instructions.
Code for the given problem:
#include<stdio.h>
#include<stdbool.h>
int main(void){
bool isTeenager;
int kidAge;
scanf("%d",&kidAge);
//Below line initializes the isTeenager variable to //it's corresponding value using ternary operator.
isTeenager = (kidAge>=13 && kidAge<=19) ? true : false;
if(isTeenager){
printf("Teen\n");
}
else{
printf("Not teen\n");
} }
Output:
18
Teen
27
Not teen
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in general, which point has the highest convection heat transfer coefficient? laminar boundary layer transition region turbulen boundary layer
The turbulent boundary layer has the highest convection heat transfer coefficient.
Higher convection coefficients inferred lower pavement temperatures and near-surface air temperatures. It is caused by more heat energy is delivered to the ambient atmosphere along convection as air moves over the hot pavement. A turbulent layer is thicker than a laminar flow layer and it cause more skin-friction drag. Whereas the pace rise evenly in a laminar flow layer, friction affects the airflow more in the lower region of a turbulent flow layer. Most of the airflow's pace reduction happen right above the surface. The turbulent boundary layer means considered include of several regions categorized by their water velocity profile.
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technician a says that loose fan belts are usually destroyed more rapidly than belts that are adjusted too tight. technician b says that too tight adjustment on poly-v fan belts can destroy bearings. who is correct?
The bearings and shaft experience additional loads as a result of this increased tension. Bearings' lifespans might be shortened by excessive stress.
Explain about poly v belt?The inside of the Poly-V Belt, also known as the Ribbed Belt, is lined with longitudinal v-shaped ribs. These ribs give the pulley and the belt a bigger surface area to contact, which increases friction force. Compared to a flat belt or rubber v-belt of the same size, the belt can convey more power as a result.
The Poly-V Belt's design ensures superior protection for all reinforcing cords, resulting in a more even load distribution. The Poly-V Belt also serves as a guide for a belt tensioner or idler pulley. Less space is needed for Poly-V Belt drives, and the Belt can be stretched under higher tension.
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Which of the following best describes a fiscal policy tool?
a. government spending
b. financial capital markets
c. bank lending
d. household spending
The element or factor which best describes a fiscal policy tool is: a. government spending.
What is a fiscal policy?A fiscal policy is sometimes referred to as monetary policy and it can be defined as the strategic use of government revenues and expenditures, in order to influence and control macroeconomic conditions such as:
Aggregate demand (AD)Money supplyEmployment within a country.InflationThe types of fiscal policy.Generally speaking, there are two (2) main types of fiscal (monetary) policy that are typically used across the world and these include the following:
Expansionary fiscal policy.Contractionary fiscal policy.In conclusion, we can reasonably infer and logically deduce that government spending is an element which is used as a fiscal policy tool to influence and control macroeconomic conditions.
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Answer:
A) government spending is the correct answer
Explanation:
(econ 1101)
The orbital motion of water particles due to surface waves stops at a depth_
Select one:
O a. twice the wavelength
O b. equal to wavelength
O c. one-half the wavelength
O d. one-tenth the wavelength
The orbital motion of water particles due to surface waves stops at a depth of "one-half the wavelength" (Option C).
What is the orbital motion of water particles?Deep water waves (depth, D >λ /2) and shallow water waves (D < λ /20) both exhibit particle orbital motion. However, while deep water waves have a circular orbit, shallow water waves have an elliptical orbit with the primary axis in the horizontal plane [2, 3, 4, 5].
Instead, the water particles travel in circular orbits with a radius equal to wave height. This orbital motion arises because water waves include both longitudinally (side to side) and transverse (up and down) components, resulting in a circular motion.
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technician a says that dynamic voltage is the voltage (usually of a battery) that exists without a load being applied. technician b says that open circuit voltage (ocv) is the voltage of the power source (battery) with the circuit in operation. who is right?
The battery electrolyte's specific gravity can be used to test the status of charge of a battery cell in the most precise and direct manner possible.
The state of charge increases with the specific gravity of the electrolyte. Voltage is the difference in electric potential between a battery's two terminals. The unit of measurement for voltage is called a volt (V), after the battery's creator, John Volta. An electronic tool called a state-of-charge battery tester is made to check the life and rechargability of an electric battery. A battery's current charging status and voltage output can be provided by a state-of-charge tester, which can also look for any defects that might impair the battery's overall performance.
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an office space is 75 ft wide by 100 ft long and 10 ft high. the indoor conditions are 75 f and 24% rh, and the outside conditions are of and saturated (100% rh). the space is designed for 50 people. the infiltration rate estimated to be 0.75 ach. calculate the sensible heat loss due to ventilation and infiltration.
The correct answer is 75ftwide by100 ft long and 10ft high the sensible heat loss due to ventilation and infiltration.
Air movement inside a structure and air exchange with the outside, whether planned or unintentional, are referred to as ventilation and infiltration, respectively. They are both crucial factors to take into account when designing healthy buildings that also reduce heat loss. Infiltration is the unintended or accidental entry of outside air into a structure, most commonly through openings in the building's exterior and doors used as passageways. Air leakage is another name for infiltration. Exfiltration is the planned or unintentional loss of interior room air from a structure. A mechanical ventilation system moves air in and out using one or more electrical blowers and occasionally a ducting system.
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consider a cylindrical titanium wire 3.0 mm (0.12 in.) in diameter and long. assuming that the deformation is totally elastic, its elongation (in mm or m) when is under a load of 500 n is:
The elongation is: 6.87 * 10⁻⁶ m
Complete Question:
Consider a cylindrical titanium wire 3.0 mm (0.12 in.) in diameter and 2.5 Ã 104 mm (1000 in.) long. Assuming that the deformation is totally elastic, its elongation (in mm or m) when is under a load of 500 n is:
Diameter of the titanium wire = d = 0.12 in = 3.0 mm = 0.003 m
Length, L = 1000in = 104 mm = 0.0104 m
Load/Force applied = F = 500 N
Elongation is change in length ΔL
Stress on the wire = Force/Area
F = 500 N
A = π (d/2) ² = π (0.003/2) ²
A = 7.069*10⁻⁶ m²
Stress = 500 N/7.069x10⁻⁶ m² = 70.731x10⁶ N/m2
Stress = 0.0707 GPa
Now, the Young's modulus for Ti = 107 GPa
Young's modulus = Stress/Strain
Strain = 0.0707/107
Strain = 0.000660
Now,
Strain = ΔL/L
ΔL = 0.000660x0.0104
ΔL = 6.87 * 10⁻⁶ m
Hence the elongation is 6.87 * 10⁻⁶ m
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what is the thermal efficiency of a rankine cycle with isentropic compression and expansion for which steam leaves the boiler as saturated vapor at 6 mpa and is condensed at 50 kpa? how does this efficiency compare the theoretical carnot efficiency? hint: draw a thermodynamic sketch of the process and look online for useful steam tables.
The carbon footprint of a building is greatly decreased by a thermally efficient building shell. 30% is the thermal efficiency.
Explain about the thermal efficiency?The proportion of heat energy that is converted into work is known as a heat engine's thermal efficiency. Even the most efficient heat engines have low efficiency; typically below 50% and frequently much lower. As a result, heat engines' energy loss to the environment represents a significant waste of energy resources.
When heat enters the boiler, the water goes through a sequence of state and energy changes before producing power through the turbine. This is known as a Rankine cycle.
We first determine the enthalpies for each state.
state 1
P = 6000 kpa x = 1 quality
h1=2784kJ/Kg
s1=5.889KJ/kgK
state 2
P=50kPa where entropy 1 Equals entropy 2
h2=2041kJ/Kg
state 3
P = 50 kpa x = 0 quality
h4=h3=340.5kJ/Kg
30% efficiency
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air is compressed at 20 psi and 70 degrees f to 150 psi in a compressor. the compressor is operated such that the air temperature remains constant. calculate the change in the specific volume of air as it passes through this compressor.
dH = V dp However, I am also aware that H = CpT. The air is compressed when a force is provided by pushing the plunger in. Consequently, the air now occupies less area (as seen below).
This demonstrates a reduction in the gas's volume (although the mass of the gas remains the same). It is accurate to say that as air temperature rises, so does air volume. As the gas volume decreases, the molecules hit the walls more frequently, raising the pressure; conversely, as the volume increases, the molecules must travel farther to strike the walls, reducing the frequency with which they do so and raising the pressure.
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is it possible to create something that no one else has created before the near future
Answer:yes
Explanation:
That's what other people done they've created something no one else thought of.
What is the overall meaning of the “Engineering V?
Answer:
Engineer V provides expert consultation in one or more areas for the design, development and implementation of technical products and systems. Resolves highly complex technical issues and conducts advanced research. Being an Engineer V recommends alterations to development and design to improve quality of products and/or procedures.
Explanation:
a distribution transformer is near a home to convert high voltage from power station to wall outlets. the wall outlets have 120 v rms. the primary to secondary turn ratio in the transformer is 200:1. find the rms power station voltage in kv.
High voltages enable the transmission of power over long distances because, as was previously mentioned, they require less current to transmit a given quantity of power, which reduces line loss.
However, large voltages provide more risks, hence transformers are used to generate lower power close to the user. The primary and secondary coils are the two coils. In typical operation, the input voltage is applied to the primary, and the secondary generates the output voltage after transformation. The primary coil's magnetic field is not only trapped by the iron core, but also strengthened by the core's magnetization. Due to the AC input voltage, the secondary receives a time-varying magnetic flux that induces an AC output voltage.
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you are on a job site and observe wall forms that are constructed of light, rigid foam insulation. a coworker explains that the wall forms will remain as part of the wall system after the concrete is poured and cured. what is the name commonly used for this type of wall?
an automotive air conditioner produces a 2-kw cooling effect while consuming 0.75 kw of power. what is the rate at which heat is rejected from this air conditioner?
The rejected by the air conditioner system is 2.75 kilowatts.
An air conditioner system involves a refrigeration cycle. It uses power to get heat from the cold reservoir before sending it to the hot reservoir. The model is described by the First Law of Thermodynamics:
QL+W-QH=0
Where:
QL- Heat rate from the cold reservoir, measured in kilowatts.
QH = Heat rate liberated to the hot reservoir, measured in kilowatts.
W = Power input, measured in kilowatts.
The heat rejected is now cleared:
QH=QL+W
If QL=2kW and W=0.75kW
QH=2.75kW
The rejected by the air conditioning system is 2.75 kilowatts.
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Tyler is developing a robot that can be sent into war zones to ensure that any mines have been detonated before soldiers are sent into the area. The government is requiring a full scale model of this robot before it is willing to purchase one
The reason a prototype is necessary before committing to a purchase in this scenario is that the robot might be very expensive.
What is a prototype?In Engineering, a prototype can be defined as a rudimentary (early) model, release, or sample of a particular product, so as to avail the developers and manufacturers an opportunity and ability to test a concept, functionality, or process within it.
This ultimately implies that, the main purpose of the prototype of a robot is to determine and show whether or not the robot and all of its features are in tandem with the design specifications and market requirements.
In this context, we can reasonably infer and logically deduce that the government requested for a full scale model of the robot before it would purchase one because it is most likely to be very expensive.
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Complete Question:
Tyler is developing a robot that can be sent into war zones to ensure that any mines have been detonated before soldiers are sent into the area. The government is requiring a full-scale model of this robot before it is willing to purchase one.
What explains why a prototype is necessary before committing to a purchase in the following scenario?
One ounce is equal to 28.35 grams. Convert 16 ounces to grams. Round your answer to the nearest tenth.
O 1.8 grams
O 12.4 grams
O 44.4 grams
O 453.6 grams
Answer:
453.6 gm
Explanation:
28.35 g / oz * 16 oz = 453.6 gm
Make sure the file GuessNumber. Py is selected and open. Write loops that validate input at all places in the code where the user is asked to provide input. Comments have been included in the code to help you identify where these loops should be written. Execute the program. See if you can guess the randomly generated number. Execute the program several times to see if the random number changes. Also, test the program to verify that incorrect input is handled correctly. On your best attempt, how many guesses did you have to take to guess the correct number
To check the input, use an if/else or a try/except statement. Use a continue statement to move on to the next iteration if the input is invalid. Use a break statement to exit the loop if the input is correct.
The flag variable will initially be set to false and if we can determine that the input data is what we are expecting, the flag status can be set to true and we can determine what can be done next based on that. The validation can be done in two different ways, namely by using a flag variable or by using try or except. For specific data types, validation should strive to be as tolerant of various forms of input as possible.
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discuss why pressure tests of pressurized tanks such as steam boilers, pipes and tanks including gases such as nitrogen, air, oxygen, etc. with high pressure are carried out hydrostatically by using liquids such as water and hydraulic oil.
The reason that pressure tests of pressurized tanks such as steam boilers, pipes and tanks including gases such as nitrogen, air, oxygen, etc. with high pressure are carried out hydrostatically by using liquids such as water and hydraulic oil is because some of them are very volatile such as oxygen and can explode and as such the use of hydrostatic solvent can reduce its temperature.
Why do you use nitrogen for pressure testing?The use of pressure tests is to ensure the integrity of equipment including pressure vessels, pipes, plumbing lines, gas cylinders, boilers, and fuel tanks, pressure tests are a non-destructive option. The piping codes demand that it be verified that a piping system can support its rated pressure and is leak-free.
Nitrogen is free from many of the issues that come with utilizing air or water for pressure testing because it is inert, odorless, and has a low moisture content. Additionally, thanks to portable nitrogen generators, nitrogen is perfect for testing in a range of places.
Tanks and pipes are subjected to hydrostatic pressure testing to check for leaks. A hydrostatic test is carried out by pressurizing the vessel or piping under test, filling it, and then checking for changes in the pressurization level.
Note that there is the district cooling or district heating systems, by performing a pressure test. In addition to ensuring proper operation, this kind of examination will enable us to identify any leaks in a specific pipe so that repairs may be completed.
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the following statements are all correct except group of answer choices the pcm controls vacuum applied to vacuum operated egr valves. some systems monitor egr operation by using a map sensor. a potentiometer is used to determine egr valve position on many obd-ii systems. low restriction exhaust systems will have no effect on egr system operation.
All correct except "Some systems monitor EGR operation by using a MAP sensor ".
What controls the vacuum to the EGR valve?The vacuum to the diaphragm is adjusted by a vacuum solenoid in vacuum driven EGR valves, which then opens and closes the EGR.Some valves additionally come with a feedback sensor to let the ECU know where the valve is.Digital EGR valves typically have a feedback sensor in addition to a solenoid or stepper motor.The PCM can monitor EGR operation via the MAP sensor (manifold absolute pressure) , EGR position sensor, EGR temperature sensor, or Fuel trim.Use the freeze frame that is connected with the fault code when the EGR check engine light illuminates to try to diagnose the circuit in these circumstances.To learn more about MAP sensor refer,
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land subsidence due to overdrawing can cause what to occur? question 19 options: the formation of sinkholes the inability to recharge the aquifer in the future damages to roads, building foundations, and sewer lines all of these choices are correct.
Land subsidence is the gradual or abrupt sinking of the Earth's surface caused by the migration of earth elements underground.
Aquifer-system compaction, drainage of organic soils, underground mining, hydro compaction, natural compaction, sinkholes, are the main causes of land subsidence. The loss of levee freeboard and subsequent reduction in flood protection, the change in gradient along water conveyance canals, damage to roads and bridges, and the collapse of water well casings are some major consequences of land. When a lot of groundwater has been taken out of particular kinds of rocks, like fine-grained sediments happens. The ground is held up in part by the water, which causes the rock to compact. The rocks collapse in on themselves when the water is turned off.
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(10 pts.) a cylindrical rod 500 mm (20.0 in.) long, having a diameter of 12.7 mm (0.50 in.), is to be subjected to a tensile load. if the rod is to experience neither plastic deformation nor an elongation of more than 1.3 mm (0.05 in.) when the applied load is 29,000 n (6500 lbf), which of the four metals or alloys listed below are possible candidates? justify your choice(s).
Only Brass and Steel are the possible candidates .
Calculation :
no plastic deformation : σ<σγ :
σ = F/Aо = 6500lbs/π(0.50in / 2)² = 6500/0.196in² = 33100 psi
Thus, at this stage, only the aluminum, brass, and steel still qualify. But, we must still satisfy the elongation restriction, with DL £ 0.05 in. under the 6500 lb. load. This must mean that a particular upper limit on the strain is required, which must mean a lower limit on the Young's modulus:
∈ = δ max / Lо = 0.05in/20in = 0.0025in
With the stress already determined, we can take stress over strain and find a desired Young's modulus, and compare this desired modulus to the actual ones available on the list:
E = σ/∈ = 33.100 psi / 0.0025 = 13.2 x 10^6 psi.
Since the strain is a maximum, the elasticity modulus, E, must be a minimum. By looking at the table, we see that of the three alloys left, only brass and steel satisfy both the criteria.
What is Young's modulus ?A solid material's tensile or compressive stiffness when a force is applied lengthwise is measured by a mechanical characteristic known as Young's modulus E, also known as the Young modulus or the modulus of elasticity in tension or compression (i.e., negative tension). It is calculated using the formula and describes the relationship between axial strain (proportional deformation) and tensile/compressive stress in the linear elastic zone of a material.Despite being named after the British scientist Thomas Young who lived in the 19th century, Leonhard Euler first proposed the idea in 1727. Giordano Riccati, an Italian physicist, conducted the first tests that utilized Young's modulus in its current form in 1782, 25 years before Young's original study. The Latin root word modus, which meaning measure, is where the word modulus comes from.Learn more about Young's modulus refer :
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In conducting a test on the kind of music that may encourage plant growth, what practice upholds the fair test standard? A. using different kinds of plants B. giving some plants more water than others C. exposing the plants to different types of music D. using nutrient-rich soil for one and plain soil for others
In conducting a test on the kind of music that may encourage plant growth, the practice that upholds the fair test standard are:
using different kinds of plants (Option A)giving some plants more water than others (Option B)using nutrient-rich soil for one and plain soil for others (Option D).What are the factors that determine plant growth?Water, light, temperature, and nutrients are the four most important factors influencing plant development.
Plants go through the following stages: seed to sprout, vegetative, budding, blooming and maturing. Similarly, when individuals and plants develop, their dietary requirements alter.
The following are major elements influencing plant growth: Temperature: As the temperature rises, growth accelerates. Light intensity, duration, and quality all have an impact on various physiological processes that occur in plants. Water: Water is necessary for plant development.
Playing classical or jazz music stimulated growth in most plants, but harder metal music generated stress. This might be because the vibrations of metal music are too strong for plants and activate cells excessively. We compare it to massaging your plant with music; they prefer a softer touch.
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Consider the following expression BNF:
::= + | - |
::= * | / |
::= | ( )
::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Using recursive descent, and only recursive descent, scan expressions that adhere to this BNF
to build their expression tree; write an integer valued function that scans the tree to
evaluate the expression represented by the tree.
There are plenty of clever programs online that you can download to evaluate arithmetic
expression tree; if you want zero in this assignment, download one and submit it as
programming assignment #2; if you want a grade greater than zero, please follow our
instructions. Thanks.
Input:
• A numeric expression adhering to this BNF.
Output:
• Some representation of the expression tree.
• The result of evaluating the expression.
The program will be:
import java.io.IOException;
import java.util.Scanner;
/* This class represents a Node in Expression Tree that will contain a digit(symbol) and will have links to its
* left and right childs, which would be recursively having its own left and right sub childs accordingly
*/
class Node {
public char data; // Store Node Data
public Node leftChild; // pointer to left sub tree
public Node rightChild;// pointer to right sub tree
// Constructor to initialize Node with data
public Node(char x) {
data = x;
}
// display the Node's data stored
public void displayNode() {
System.out.print(data);
}
}
/* This is Stack class (Stack1) which performs push(), pop(), isEmpty() operation on Node's data */
class Stack1 {
private Node[] a; // Stack of type Node
private int top, m; // top = top of stack variable, m = Maximum Size of the Stack
public Stack1(int max) {
m = max;
a = new Node[m];
top = -1;
}
What is a have program?Java is a popular object-oriented programming language and software platform that powers billions of devices such as notebook computers, mobile devices, gaming consoles, medical devices, and many more.
Java's rules and syntax are based on the C and C++ programming languages. The program is illustrated based on the information.
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Tech A says that the principle of thermal expansion is what pushes the piston down the cylinder on the power stroke. Tech B says that the piston is pulled down the cylinder on the intake stroke. Who is correct?
Tech A is correct because Tech A says that the principle of thermal expansion is what pushes the piston down the cylinder on the power stroke.
What motion does the compression piston make?while the intake and exhaust valves are kept closed by valve springs, the piston advances up the cylinder during the compression stroke to pressurize the fuel/air combination. A high-tension spark from the spark plug ignites the mixture of fuel and air during the power stroke.
Note that By pushing the piston downward and expanding the chamber's capacity, the heat energy generated by combustion is put to use in the chamber. Due to the fact that this is when the thermal energy is converted into motion to power the device or vehicle, it is sometimes referred to as the "power stoke."
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generation of electricity in coal-burning power plants and nuclear power plants both involve . group of answer choices generation of fly ash production of large amounts of carbon dioxide none of the above heating water to produce steam which drives a turbine high-level radioactive waste
The enormous electrical generator, which produces the electricity, is driven by the revolving turbine shaft. For power plants that utilize various fuels, such coal, gas, or oil, the idea is the same.
These sizable pools of water or cooling towers are also found in numerous other power plants, such as coal-fired power plants. This resemblance arises from the fact that coal-fired and nuclear power plants both employ the same technique to convert heat into electricity. Chemical potential energy is converted into heat energy, light energy, and sound energy when coal is burned. The only energy used in the creation of electricity is thermal energy. According to the U.S. Energy Information Administration, coal, nuclear power, and natural gas made up the majority of the country's electricity generation in 2020.
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Technician A says that a tapered roller bearing assembly has less rolling resistance than a similarly sized ball bearing assembly. Technician B says that the bearing assembly in a unitised wheel bearing assembly can normally be disassembled, cleaned, and repacked. Who is correct?
Technician A says that a tapered roller bearing assembly has less rolling resistance than a similarly sized ball bearing assembly. Technician B says that the bearing assembly in a unitized wheel bearing assembly can normally be disassembled, cleaned, and repacked. The technician that is correct is Technician B.
What is a Tapered Roller Bearing Assembly?A cup and cone assembly is used in tapered roller bearings. The cup is made up of the outer ring, and the cone assembly is made up of the inner ring, rollers, and cage. This bearing design accommodates combined loads while maintaining minimal friction during operation.
A roller bearing is a cylindrical element that allows a bushing or bearing block to move with little friction.
A ball bearing is a spherical unit with the same purpose as a roller bearing. The real distinction is the contact surface between the bearing and the rail.
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