Answer:
A voltage divider is a simple series resistor circuit. It's output voltage is a fixed fraction of its input voltage. The divide-down ratio is determined by two resistors.
I need some help!
Thanks
Answer:
a c 1 museum is a patient who by think and pay the the price
Determine the length of the base if the height of a triangle is 28 feet and the area of the triangle is 350 square feet.
Answer: 25 ft
Explanation:
For a triangle, the area is given by
A = (1/2)base*height
Rearranging,
base = 2A/height
Substituting the given values,
base = 2(350 ft^2)/(28 ft) = 25 ft
Trichloroethylene (TCE) is a common groundwater contaminant. Based on an adult ingesting the water under residential exposure parameters, which of the following presents the greatest cancer risk:
a. to drink unchlorinated groundwater with 10 ppb of TCE
b. to switch to a surface water supply that, as a result of chlorination, has a chloroform concentration of 50 ppb
Answer:
To drink unchlorinated groundwater with 10 ppb of TCE ( A )
Explanation:
The option that presents the greatest cancer risk for ingesting water
contaminated with Trichloroethylene under the residential exposure parameters is to drink unchlorinated groundwater with 10 ppb of TCE
This is because suitable water for drinking has chloroform concentration that ranges from 4 to 44 ppb but drinking under groundwater with ppb value above 4 ppb will have a more severe damage to the body
A thin silicon chip and an 8-mm-thick aluminum substrate are separated by a 0.02-mm-thick epoxy joint. The chip and substrate are each 10 mm on a side, and their exposed surfaces are cooled by air, which is at a temperature of 25 C and provides a convection coefficient of 100 W/m2 K. If the chip dissipates 104 W/m2 under normal conditions, will it operate below a maximum allowable temperature of 85 C
Answer:
The chip will operate below a maximum allowable temperature of 85°C
Explanation:
Given data:
8-mm-thick aluminum
0.02 mm-thick epoxy joint
chip and substrate = 10 mm on a side
temperature = 25°C
attached below is a detailed solution
Tc = 75.3 ° c which is less than 85°c . hence the chip will operate below a maximum allowable temperature of 85°C
Thermal energy storage systems commonly involve a packed bed of solid spheres, through which a hot gas flows if the system is being charged, or a cold gas if it is being discharged. In a charging process, heat transfer from the hot gas increases thermal energy stored within the colder spheres; during discharge, the stored energy decreases as heat is transferred from the warmer spheres to the cooler gas. Consider a packed bed of 75-mm-diameter aluminum spheres (p = 2,700 kg/m^3; c = 950 J/kg*K; k = 240 W/m*K) and a charging process for which gas enters the storage unit at a temperature of 300 degrees C. The initial temperature of the spheres is Ti = 25 degrees C and the convection heat transfer coefficient is h = 75 W/m^2*K.
a. How long does it take a sphere near the inlet of the system to accumulate 90% of the maximum possible thermal energy? What is the corresponding temperature at the center of the sphere?
b. Is there any advantage to using copper (p = 8,900 kg/m^3; c = 380 J/kg*K; k = 390W/m*K) instead of aluminum?
c. Consider the same packed bed operating conditions, but with Pyrex (p = 2,200 kg/m^3; c = 840 J/kg*K; k = 1.4 W/m*K) used instead of aluminum. How long does it take a sphere near the inlet of the system to accumulate 90% of the maximum possible thermal energy? What is the corresponding temperature at the center of the sphere?
Answer:
A) i) 984.32 sec
ii) 272.497° C
B) It has an advantage
C) attached below
Explanation:
Given data :
P = 2700 Kg/m^3
c = 950 J/kg*k
k = 240 W/m*K
Temp at which gas enters the storage unit = 300° C
Ti ( initial temp of sphere ) = 25°C
convection heat transfer coefficient ( h ) = 75 W/m^2*k
A) Determine how long it takes a sphere near the inlet of the system to accumulate 90% of the maximum possible energy and the corresponding temperature at the center of sphere
First step determine the Biot Number
characteristic length( Lc ) = ro / 3 = 0.0375 / 3 = 0.0125
Biot number ( Bi ) = hLc / k = (75)*(0.0125) / 40 = 3.906*10^-3
Given that the value of the Biot number is less than 0.01 we will apply the lumped capacitance method
attached below is a detailed solution of the given problem
B) The physical properties are copper
Pcu = 8900kg/m^3)
Cp.cu = 380 J/kg.k
It has an advantage over Aluminum
C) Determine how long it takes a sphere near the inlet of the system to accumulate 90% of the maximum possible energy and the corresponding temperature at the center of sphere
Given that:
P = 2200 Kg/m^3
c = 840 J/kg*k
k = 1.4 W/m*K
Multiple Choice
Which are the five modes of transportation?
rail, truck, car, boat, bike
air, rail, water, road, pipeline
water, road, pipeline, barge, rail
pipeline, water, UPS, Fed Ex, road
Question # 3
Multiple Choice
What is the most common mode of transportation in the United States?
air
road
water
pipeline
Question # 4
Multiple Select
Why is flexibility the most obvious benefit of road transportation? (Select all that apply.)
Transportation companies can set up systems for having a truck driver approaching his or her maximum driving hours take freight to a drop location where a fresh driver can pick it up and continue on with it.
Trucks can go anywhere that there are roads.
Transportation companies can employ driving teams of two drivers in the same truck to increase haul times and daily mileage.
Truck shipments are impervious to weather conditions like fog, ice, heavy rain, and snow.
Question # 5
Multiple Select
Why is air transportation radically different from other modes? (Select all that apply.)
Airplanes travel at much higher speeds, between 500 and 600 miles per hour.
Airfreight comes at a high cost.
Air transportation is the safest mode for freight.
Air transportation is the only mode that can occur both internationally and domestically.
Question # 6
Multiple Select
Since air transportation is so much more costly than other modes, what justifies its use? (Select all that apply.)
Some kinds of freight are perishable, very expensive, or fragile enough to warrant special shipping treatment.
The environmental impact of air transportation is lower, so companies can justify its use.
Air transportation is unaffected by delays for maintenance, scheduling, and weather, making it far more reliable.
Some companies might think it's worth the cost to ensure that they have faster service or more items in stock on demand.
Question # 7
Multiple Select
Since the most cost effective way to ship on the road is typically a truckload, why do customers patronize carriers that specialize in the LTL business? (Select all that apply.)
Some businesses are too small to be able to fill up entire trailers with their typical shipments. They can't use FTL carriers and must try to pool costs with other businesses like them by using LTL specialists.
Some businesses have freight that is low-value and simply need the lowest cost option.
Some businesses have time-sensitive or perishable freight and LTL specialist businesses are quicker.
Some businesses only ship specialized items that they don't want mixed with the freight from other customers.
Answer:
1 . these most common 5 modes of transportation are Railway Road via waterway and pipelines
2 .
Write a program that read two integers and display their MOD,VID and their floating-point division in both settings x/y and y/x
e.g 5/3 and 3/5
Answer:
#!/usr/bin/env python
def calculate(x, y):
return {
"MOD": x % y,
"DIV": x/y, # you mean div instead of “VID”, right?
"floating-point division": float(x)/y,
}
def calculateInBothSettings(x, y):
return {
"x/y": calculate(x, y),
"y/x": calculate(y, x),
}
if __name__ == "__main__":
x = int(input("x: "))
y = int(input("y: "))
print(calculateInBothSettings(x, y))
Explanation:
I wrote a python script. Example output:
x: 2
y: 3
{'x/y': {'MOD': 2, 'DIV': 0.6666666666666666, 'floating-point division': 0.6666666666666666}, 'y/x': {'MOD': 1, 'DIV': 1.5, 'floating-point division': 1.5}}
Truckco manufactures two types of trucks: 1 and 2. Each truck must go through the painting shop and assembly shop. If the painting shop were completely devoted to painting Type 1 trucks, then 800 per day could be painted; if the painting shop were completely devoted to painting Type 2 trucks, then 700 per day could be painted. If the assembly shop were completely devoted to assembling truck 1 engines, then 1,500 per day could be assembled; if the assembly shop were completely devoted to assembling truck 2 engines, then 1,200 per day could be assembled. Each Type 1 truck contributes $300 to profit; each Type 2 truck contributes $500. How much capacity in percent does a single truck of each type uses at each shop?
There are seven steps in the engineering design process. Why is it important that the engineer not skip a step?
It is illegal to skip a step.
Not skipping steps ensures that the best possible design is chosen and developed.
Without completing all the steps, nothing would ever be approved by the government.
Since there is a team of employees, a skipped step can mean that someone will not be compensated for his or her role in the pre
TUID
Answer:
Not skipping steps ensures that the best possible design is chosen and developed.
Explanation:
Engineers should not skip any step to ensure the best possible design is chosen and developed.
Answer:
Not skipping steps ensures that the best possible design is chosen and developed.
Explanation:
Select three functions of catalysts.
speed up food processing
slow down food processing
slow down plant growth
speed up plant growth
O decrease fuel efficiency
Increase fuel efficiency
Answer: speed up food processing
speed up plant growth
Increase fuel efficiency
Explanation:
A catalyst simply refers to a substance that leads to an increase in the reaction rate when it's added to a substance. When the activation energy is reduced by catalysts, this.hwlpa on the speeding up of a reaction.
Therefore,the functions of catalysts include speed up food processing, speeding up plant growth and increase fuel efficiency
Air enters a compressor operating at steady state at 1 bar, 290 K, with a mass flow rate of 0.1 kg/s and exits at 980 K, 10 bar. The velocities at the inlet and exit are 10 m/s and 30 m/s, respectively. The air can be modeled as an ideal gas, and potential energy effects can be neglected. If the magnitude of the power input to the compressor is 77 kW, determine the rate of heat transfer, in kW.
Answer:
7.615 kW
Explanation:
Solution in pen paper form in the attachment section
A customer complains that the car pulls to the left during hard braking. An inspection shows that the front pads and rear shoes are worn. After resurfacing the rotors and drums and replacing the pads and shoes, a road test reveals that the car still pulls to the left during hard braking. Technician A says the wheel alignment should be checked. Technician B says the tires could be the problem and should be swapped left to right to check whether the direction of the pull changes. Who is correct
1. A drilling operation is to be performed with a 10 mm diameter twist drill in a steel workpart. The hole is a blind hole at a depth of 60 mm and the point angle is 118. The cutting speed is 30 m/min and the feed is 0.25 mm/rev. Determine (a) the cutting time to complete the drilling operation, and (b) metal removal rate during the operation, after the drill bit reaches full diameter.
Answer:
The answer is below
Explanation:
v = velocity = 30 m/min = 30 * 10³ mm/min, D = diameter = 10 mm, f = feed = 0.25 mm/rev, point angle = 118, cutting time = Tm, d = depth = 60 mm
[tex]a)\\N=\frac{v}{\pi D}=\frac{30*10^3}{\pi * 10}=954.9\ rev/min\\\\f_r=Nf =954.9(0.25)=238\ mm/min\\\\A=0.5Dtan(90-\frac{point\ angle}{2} )=0.5*10*tan(90-\frac{118}{2} )=3\ mm\\\\T_m=\frac{(d+A)}{f_r} =\frac{60+3}{238}=0.265 \ s\\\\b)\\metal\ removal\ rate(R_{MR})=0.25\pi D^2f_r\\\\R_{MR}=0.25\pi (10)^2(238)=18692\ mm^3/min[/tex]
A train is traveling with a velocity of 23 m/s when the conductor sees a car stuck on the tracks 500 m away. What acceleration is needed for the train to stop 10 m from the car?
Answer:
[tex]a = -0.54\ m/s^2[/tex]
Explanation:
Given
[tex]u = 23m/s[/tex] --- initial velocity
[tex]v = 0m/s[/tex] --- final velocity
[tex]s = 500m[/tex] --- distance of the car
Required
Determine the train's acceleration to stop 10m before the obstacle
This will be solved using:
[tex]v^2 = u^2 + 2aH[/tex]
Where
[tex]H = s - 10[/tex] i.e to stop 10m before the car
So, we have:
[tex]0^2= 23^2 + 2a(s - 10)[/tex]
[tex]0^2= 23^2 + 2a(500 - 10)[/tex]
[tex]0= 529 + 2a*490[/tex]
Collect like terms
[tex]2a*490 = 0 -529[/tex]
[tex]2a*490 = -529[/tex]
Make a the subject
[tex]a = -\frac{529}{2*490}[/tex]
[tex]a = -\frac{529}{980}[/tex]
[tex]a = -0.54\ m/s^2[/tex] --- approximated
It is negative because the train decelerates
2 A SQUARE GIVEN
LENGTH OF DIAGONAL = 70 mm
Answer:
Area of square = 2,450 mm²
Explanation:
Given:
Length of diagonal = 70 mm
Find:
Area of square
Computation:
Area of square = diagonal² / 2
Area of square = 70² / 2
Area of square = 4900 / 2
Area of square = 2,450 mm²
It describes the physical and social elements common to this work. Note that common contexts are listed toward the top, and less common contexts are listed toward the bottom. According to O*NET, what are common work contexts for Reporters and Correspondents? Check all that apply.
Answer:
Acef
Explanation:
Edginuity 2021
Answer:
2,3,4,5
Explanation:
guy above me is wrong
Some of our modern kitchen cookware is made of ceramic materials. (a) List at least three important characteristics required of a material to be used for this application. (b) Make a comparison of three ceramic materials as to their relative properties and, in addition, to cost. (c) On the basis of this comparison, select the material most suitable for the cookware.
Answer:
A)
It should be Non- toxic
It should possess high Thermal conductivity
It should have the Required Thermal diffusivity
B)
stoneware : This material has good thermal diffusivity and it is quite affordable and it is used in making pizza stonesporcelain: mostly used for mugs and it is non-toxic Pyrex : posses good thermal conductivity used in ovenC) All the materials are suitable because they serve different purposes when making modern kitchen cookware
Explanation:
A) characteristics required of a ceramic material to be used as a kitchen cookware
It should be Non- toxicIt should possess high Thermal conductivityIt should have the Required Thermal diffusivityB) comparison of three ceramic materials as to their relative properties
stoneware : This material has good thermal diffusivity and it is quite affordable and it is used in making pizza stonesporcelain: mostly used for mugs and it is non-toxic Pyrex : posses good thermal conductivity used in ovensC) material most suitable for the cookware.
All the materials are suitable because they serve different purposes when making modern kitchen cookware
A signal is assumed to be bandlimited to kHz. It is desired to filter this signal with an ideal bandpass filter that will pass the frequencies between kHz and kHz by a system for processing analog signals composed of a digital filter with frequency response sandwiched between an ideal A/D and an ideal D/A, both operating at sampling interval . 1. Determine the Nyquist sampling frequency, (in kHz), for the input signal. 2. Find the largest sampling period (in s) for which the overall system comprising A/D, digital filter and D/A realize the desired band pass filter.
Answer:
Hello your question is poorly written attached below is the complete question
answer :
1) 60 kHz
2) Tmax = ( 1 / 34000 ) secs
Explanation:
1) Determine the Nyquist sampling frequency, (in kHz), for the input signal.
F(s) = 2 * Fmax
Fmax = 30 kHz ( since Xa(t) is band limited to 30 kHz )
∴ Nyquist sampling frequency ( F(s) ) = 2 * 30 = 60 kHz
2) Determine the largest sampling period (in s) .
Nyquist sampling period = 1 / Fs = ( 1 / 60000 ) s
but there is some aliasing of the input signal ( minimum aliasing frequency > cutoff frequency of filter ) hence we will use the relationship below
= 2π - 2π * T * 30kHz ≥ 2π * T * 4kHz
∴ T ≤ [tex]\frac{1}{34kHz}[/tex]
largest sampling period ( Tmax ) = ( 1 / 34000 ) secs
FOR BRAINLIST !!
B 5. An adaptation is a hereditary characteristic within some organisms in a population.
There are structural, behavioral, and functional adaptations. Which of the following is
NOT a behavioral adaptation?
A 3-phase , 1MVA, 13.8kV/4160V, 60 Hz, transformer with Y-Delta winding connection is supplying a3-phase, 0.75 p.u. load on the 4160V side of the transformer. The load has leading power factor of 0.9. It issupplied by 1 p.u. voltage on the 13.8kV side. The transformer per unit impedance is j0.12 referred to thesecondary side.
a. Find the load impedance.
b. Find the input current on the primary side in real units.
c. Find the input power factor
Answer:
a) 23.89 < -25.84 Ω
b) 31.38 < 25.84 A
c) 0.9323 leading
Explanation:
A) Calculate the load Impedance
current on load side = 0.75 p.u
power factor angle = 25.84
[tex]I_{load}[/tex] = 0.75 < 25.84°
attached below is the remaining part of the solution
B) Find the input current on the primary side in real units
load current in primary = 31.38 < 25.84 A
C) find the input power factor
power factor = 0.9323 leading
attached below is the detailed solution
A program consists of 100,000 instructions as follows:
Instruction Type Instruction Count Cycles per Instruction
Integer arithmetic 45,000 4
Data transfer 32,000 6
Floating point arithmetic 15,000 10
Control transfer 8,000 3
Determine:
a. the program execution time
b. the effective CPI for the machine
c. MIPS rate for the following processors
Answer:
Execution time is 13.65ms
CPI is 5.46
MIPS is 73.3\ MIPs
Explanation:
Given:
[tex]s = 40MHz[/tex] --- processor speed [Missing from the question]
[tex]\begin{array}{ccc}{Instruction\ Type} & {Instruction\ Count} & {Cycles\ per\ Instruction} & {Integer\ Arithmetic} & {45000} & {4} \ \\ {Data\ Transfer} & {32000} & {6} & {Floating\ point\ arithmetic} & {15000} & {10} & {Control\ Transfer} &{8000} & {3} \ \end{array}[/tex]
Solving (a): The program execution time
First, we solve for (b)
Solving (b): The effective CPI
This is calculated as:
[tex]CPI = \frac{\sum IC * CI}{\sum IC}[/tex]
Where: IC = Instruction Count and CI = Cycles per Instruction
So, the equation becomes:
[tex]CPI = \frac{45000 *4 + 32000 * 6 + 15000 * 10 + 8000 * 3}{45000+32000+15000+8000}[/tex]
[tex]CPI = \frac{546000}{100000}[/tex]
[tex]CPI = 5.46[/tex]
Solving (c): MIPS
This is calculated as:
[tex]MIPS = Speed * \frac{1}{CPI} * \frac{1}{\sum IC}[/tex]
[tex]MIPS = 40 * \frac{1}{5.46} * \frac{1}{100000}[/tex]
[tex]MIPS = \frac{40 * 1 * 1}{5.46*100000}[/tex]
[tex]MIPS = \frac{40}{546000}[/tex]
[tex]MIPS = 0.00007326007[/tex]
Convert to MIPs
[tex]MIPS = 73.3\ MIPs[/tex]
Solving (a): Execution Time
This is calculated as:
[tex]Time = Instructions * CPI * \frac{1}{Speed}[/tex]
[tex]Time = 100000 * 5.46* \frac{1}{40M}[/tex]
[tex]Time = \frac{546000}{40M}[/tex]
[tex]Time = \frac{546000}{40*1000000}[/tex]
[tex]Time = \frac{546000}{40000000}[/tex]
[tex]Time = 0.01365s[/tex]
[tex]Time = 13.65ms[/tex]
Execution time is 13.65ms
Team communication is often more formal than other types of group communication.
True
False
Answer:
True
Explanation:
A demand factor of _____ percent applies to a multifamily dwelling with ten units if the optional calculation method is used.
Engine oil flows at a rate of 1 kg/s through a 5-mmdiameter straight tube. The oil has an inlet temperature of 45°C and it is desired to heat the oil to a mean temperature of 80°C at the exit of the tube. The surface of the tube is maintained at 150°C. Determine the required length of the tube. Hint: Calculate the Reynolds numbers at the entrance and
Answer:
length of tube = 4.12 m
Explanation:
Given data:
flow rate of engine oil = 1 kg/s
diameter of tube = 5-mm
inlet temperature of oil = 45°C
exit temperature of oil = 80°C
surface temperature of tube = 150°C
Determine the required length of the tube
attached below is a detailed solution to the given problem
length of tube = 4.12 m
differentiate between isohyetal method and arithmetical average method of rainfall
Answer:
Explained below
Explanation:
The isohyetal method is one used in estimating Rainfall whereby the mean precipitation across an area is gotten by drawing lines that have equal precipitation. This is done by the use of topographic and other data to yield reliable estimates.
Whereas, the arithmetic method is used to calculate true precipitation by the way of getting the arithmetic mean of all the points or arial measurements that will be considered in the analysis.
You have a motor such that if you give it 12 Volt, it will eventually reach a steady state speed of 200 rad/s. If it starts from rest, then it takes 1.2 second for it to reach 63.2% of the steady state speed. You attach a sensor to the motor which measures its angle very accurately. The measured angle is used by the controller whose aim is to provide voltage to the motor and make the angle of the motor same as the desired angle.
Required:
a. What is the transfer function of the motor, from voltage to speed?
b. Draw the block diagram of the system with plant, controller and the feedback path.
c. What is the system type (i.e. the type of GK)?
d. If the desired speed is a constant (say 100 rad/s). What should be range of gain K of the proportional controller, so that steady state error in the speed is less than 10%? (i.e. what number K will ensure that, (desired speed - actual steady state speed)/desired speed < 0.1 ?)
e. What happens the above % error in the steady state speed as the gain K is increased?
Answer:
a) [tex]\frac{Ws}{Es} = \frac{200}{1+1.2s}[/tex]
b) attached below
c) type zero system
d) k > [tex]\frac{g}{200}[/tex]
e) The gain K increases above % error as the steady state speed increases
Explanation:
Given data:
Motor voltage = 12 v
steady state speed = 200 rad/s
time taken to reach 63.2% = 1.2 seconds
a) The transfer function of the motor from voltage to speed
let ; [tex]\frac{K1}{1+St}[/tex] be the transfer function of a motor
when i/p = 12v then steady state speed ( k1 ) = 200 rad/s , St ( time constant ) = 1.2 sec
hence the transfer function of the motor from voltage to speed
= [tex]\frac{Ws}{Es} = \frac{200}{1+1.2s}[/tex]
b) draw the block diagram of the system with plant controller and the feedback path
attached below is the remaining part of the detailed solution
c) The system is a type-zero system because the pole at the origin is zero
d) ) k > [tex]\frac{g}{200}[/tex]
Determine the magnitude of force F so that the resultant force of the three forces is as small as possible. What is the magnitude of the resultant force?
Answer:
hello your question is incomplete attached below is the missing diagram
answer : 7.87 KN
Explanation:
The magnitude of the resultant force = 7.87 KN
from fig 1
First step :
calculate the resultant force along the x- direction
Frx = ∑Fx = +8 kN - Fcos45° - 14cos 30°
= -4.1243 - 0.7071 F
next :
calculate the resultant force along the y- direction
Fry = ∑Fy = -Fsin45° + 14sin30°
= -0.7071 F + 7
attached below is the remaining part of the detailed solution
Compression is maintained during combustion because on top of the motor is a _____
Answer:
fan
Explanation:
Question 1: What is the power observed in the energy analyzer when the rated voltage(U1) is applied to the primary of the transformer, and there is no load at the secondary?
Question 2: Find the transformation ratio of the transformer using the values U1,U2 recorded in the experiment.
Question 3: Sketch the no-load operation graph of the transformer using the values U1, I2 and the values read in the energy analyzer.
Question 4: How can we find the number of turns of transformer?
Question 5: Explain the operation principle of the transformer.
Question 6: State your final observations about the experiment.
Answer:
preguntas a parte o no???????
A parallel circuit has a resistance of 280 and an inductive reactance of 360 02. What's this circuit's impedance?
Answer:
540 W
Explanation: