In a cellular phone system, a mobile phone must be paged to receive a phone call. However, paging attempts don’t always succeed because the mobile phone may not receive the paging signal clearly. Consequently, the system will page a phone up to three times before giving up. If the results of all paging attempts are independent and a single paging attempt succeeds with probability 0.8, sketch a probability tree for this experiment and find the probability P[F] that the phone receives the paging signal clearly.
Answers
Answer:
The correct response will be "0.992". The further explanation to the following question is given below.
Explanation:
The probability that paging would be beneficial becomes 0.8
Effective paging at the very first attempted is 0.8
On the second attempt the success probability will be:
⇒ \(0.2\times 0.8\)
⇒ \(0.16\)
On the third attempt the success probability will be:
⇒ \(0.2\times 0.2\times 0.8\)
⇒ \(0.032\)
So that the success probability will be:
⇒ \(0.8 + 0.16 + 0.032\)
⇒ \(0.992\)
Related Questions
Describe three differences between liquids and gases in fluid power systems.
Answers
Answer:
Liquids have less force of attraction between molecules than solids and more than gases; gases have a very weak force of attraction between the molecules which is the least amongst the three states of matter.
Explanation:
if both the ram air input and drain hole of the pitot system become blocked, the indicated airspeed will
Answers
If both the ram air input and drain hole of the pitot system become blocked, the indicated airspeed will: a) increase during a climb.
What is a ram air input?A ram air input can be defined as an air intake system which is designed and developed to use the dynamic air pressure that is created due to vehicular motion, or ram pressure, in order to increase the static air pressure within the intake manifold of an internal combustion engine of an automobile.
This ultimately implies that, a ram air input allows a greater mass-flow of air through the engine of an automobile, thereby, increasing the engine's power.
In conclusion, indicated airspeed will increase during a climb when both the ram air input and drain hole of the pitot system become blocked.
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Complete Question:
If both the ram air input and drain hole of the pitot system become blocked, the indicated airspeed will
a) increase during a climb
b) decrease during a climb
c) remain constant regardless of altitude change
A two-dimensional flow field described by
V = (2x^2y + x)1 + (2xy^2 + y + 1 )j
where the velocity is in m/s when x and y are in meters. Determine the angular rotation of a fluid element located at x 0.5 m, y 1.0 m.
Answers
Answer:
the answer is
Explanation:
We now focus on purely two-dimensional flows, in which the velocity takes the form u(x, y, t) = u(x, y, t)i + v(x, y, t)j. (2.1) With the velocity given by (2.1), the vorticity takes the form ω = ∇ × u = ∂v ∂x − ∂u ∂y k. (2.2) We assume throughout that the flow is irrotational, i.e. that ∇ × u ≡ 0 and hence ∂v ∂x − ∂u ∂y = 0. (2.3) We have already shown in Section 1 that this condition implies the existence of a velocity potential φ such that u ≡ ∇φ, that is u = ∂φ ∂x, v = ∂φ ∂y . (2.4) We also recall the definition of φ as φ(x, y, t) = φ0(t) + Z x 0 u · dx = φ0(t) + Z x 0 (u dx + v dy), (2.5) where the scalar function φ0(t) is arbitrary, and the value of φ(x, y, t) is independent of the integration path chosen to join the origin 0 to the point x = (x, y). This fact is even easier to establish when we restrict our attention to two dimensions. If we consider two alternative paths, whose union forms a simple closed contour C in the (x, y)-plane, Green’s Theorem implies thatA chain fall locks it’s elevated load is place using
Answers
A chain fall locks it’s elevated load is place using an automatic brake.
A chain fall locks it’s elevated load is place using an automatic brake.
What is automatic brake?Automatic emergency braking (AEB) is a safety feature that may detect when a collision is likely to happen and automatically apply the brakes to either slow down the vehicle before impact or stop it altogether to prevent a collision.
Additionally, it found that injuries from these incidents decreased by 56%. Reverse automated braking systems have been associated with a 78% reduction in crashes when compared to vehicles that merely have a reverse camera.
In general, automatic emergency braking is intended to engage at highway speeds, provided the front collision warning sensors can identify the car in front of them. In towns, newer systems operate at slower rates.
Thus, an automatic brake.
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_____is a slow wireless technology used to connect devices within a radius of about 30 feet
Answers
Answer:
Bluetooth is a slow wireless technology used to connect devices within a radius of about 30 feet. While Bluetooth technology is amazing, there are lots of bugs involved with Bluetooth devices, and there is still lots to be discovered in this area of tech.
In a typical high-pressure pneumatic system, if the moisture separator does not vent accumulated water when the compressor shuts down, a likely cause is a?
Answers
Answer:
Explanation:
malfunctioning solenoid dump valve
One good way to improve your gas mileage is to _____.
Answers
The formula for calculating risk considering risk perception is ?
Answers
Answer:
risk = probability x loss
Explanation:
help please thank you
Answers
The system is operated at a feed rate of 15 × 10^(-3) m^3/h with an initial glucose concentration of 10 kg/m^3.
How to explain the informationThe steady-state mass balance for the reactor can be written as:
F = QX + Qs
where F is the feed rate, QX is the volumetric flow rate of cells, and Qs is the volumetric flow rate of glucose.
At steady-state, QX and Qs are constant. Therefore, we can write:
QX = F - Qs
In this case, the system is operated at a feed rate of 15 × 10^(-3) m^3/h with an initial glucose concentration of 10 kg/m^3.
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Which term is defined as the study of sound waves and their behaviors and interactions? propulsion acoustics hydraulics thermodynamics
Answers
Answer: i believe it’s acoustics
Explanation:
In Biomedical engineering signals and systems, how is the fourier coefficient and the fourier transform expression written
Answers
Answer:
Fourier coefficient, Ck:
\({ \rm{ c_{k}} = \int ^{ \infin} _{ - \infin } \{x(t) {e}^{jk \omega _{0} t} \} }\)
Fourier transform:
\({ \rm{x( \omega) = \int ^{ \infin} _{ - \infin} } \{x(t) {e}^{j \omega} t} \}\)
In using semaphores to control access to a critical section, we initialize the semaphore’s counter to 1. What happens if we initialize it to 0? to 2?
Answers
Semaphores are used to control access to a shared resource, such as a critical section, in a concurrent system. The semaphore maintains a counter that represents the number of available resources.
When a process requests access to the shared resource, it must acquire the semaphore, decrement the counter, and release the semaphore when it is done with the resource. This ensures that only one process can access the critical section at a time, preventing race conditions and other synchronization issues.
If we initialize the semaphore's counter to 0, it means that there are no resources available. Any process that tries to acquire the semaphore will block until another process releases the semaphore and increments the counter. This can be useful in cases where we want to ensure that a process waits for a resource to become available before proceeding.
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the beam supports a uniform dead load of 0.4k/ft, a live load of 1.5k/ft and a single live concentrated force of 8k. determine (a) the maximum positive moment at c and (b) the maximum positive vertical reaction at b. assume a is a roller and b is a pin.
Answers
The maximum positive moment at c is 135k/ft
the maximum positive vertical reaction at b is 27k
Part a
Maximum positive moment at c
For maximum positive moment at C and as per Muller's principle, ILD influence line will be on moment at с, this is calculated using the equation below:
Maximum positive moment at c = \((\frac{1}{2} *20*5*(0.4+0.5) )+(5*8)\)
= 135k.ft
Part b
Maximum positive vertical reaction at b
To find this using Muller's principle, we keep dead load throughout the span and consequently keep point load at B
Maximum positive vertical reaction at b = \((\frac{1}{2} *20*1*(0.4+1.5))+(1*8)\)
= 27k
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An infinitesimal lossless dipole of length L is positioned along the x-axis of the coordinate system
rectangular (x,y,z) and symmetrically about the origin and excited by a current of complex amplitude C. For
observations in the far field region, determine:
(i) The electromagnetic field radiated by the dipole;
(ii) The average power density;
(iii) The radiation intensity;
(iv) A relationship between the radiation and input resistances of the dipole.
Answers
(i) The electromagnetic field radiated by the dipole: An infinitesimal lossless dipole of length L is positioned along the x-axis of the coordinate system rectangular (x,y,z) and symmetrically about the origin and excited by a current of complex amplitude C.
The vector potential due to the current distribution of the current element is given by;
A(\vec{r},t) = -\frac{j\mu _0}{4\pi}\frac{e^{-jkr}}{r}(\vec{m}\cdot \vec{r})
The vector potential is given as the product of a factor that depends only on the geometry of the source and a function that depends on the time and the observation point.(ii) The average power density: The power radiated by a dipole of length L driven by an alternating current I is given by;
P_{rad} = \frac{1}{2}\eta I^2L^2\left(\frac{\omega}{c}\right)^4
For an isotropic radiator, the total power radiated is uniformly distributed over the surface of a sphere of radius r in the far field, the intensity of the radiation at any point is the power received per unit area per unit solid angle. The average power density at the observation point in the far field of a lossless dipole is given by:
\overline{P_{rad}} = \frac{P_{rad}}{4\pi r^2}
(iii) The radiation intensity: The radiation intensity of a small electric dipole moment m is given by;
U = \frac{\eta I^2L^2}{12\pi r^2}sin^2\theta
where L is the length of the dipole, I is the current flowing through the dipole, θ is the angle between the line joining the point of observation to the dipole and the dipole axis, r is the distance between the dipole and the point of observation and \eta = \sqrt{\frac{\mu _0}{\epsilon _0}} is the wave impedance of free space.(iv) A relationship between the radiation and input resistances of the dipole:
The input impedance of the half-wave dipole is given by:
Z_{in} = \frac{73 + j42.5}{2\pi fL} \Omega
The radiation resistance of the half-wave dipole is given by:
R_{rad} = \frac{2\pi ^2 f^2L^2}{3\lambda ^2} \Omega .
Hence, the relationship between radiation and input resistance is given by:
R_{rad} = \frac{3}{4}Z_{in}
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For a steel alloy it has been determined that a carburizing heat treatment of 11.3 h duration will raise the carbon concentration to 0.44 wt% at a point 1.8 mm from the surface. Estimate the time necessary to achieve the same concentration at a 4.9 mm position for an identical steel and at the same carburizing temperature.
Answers
This question is incomplete, the complete question is;
For a steel alloy it has been determined that a carburizing heat treatment of 11.3 h duration at Temperature T1 will raise the carbon concentration to 0.44 wt% at a point 1.8 mm from the surface. A separate experiment is performed at T2 that doubles the diffusion coefficient for carbon in steel.
Estimate the time necessary to achieve the same concentration at a 4.9 mm position for an identical steel and at the same carburizing temperature T2.
Answer:
the required time to achieve the same concentration at a 4.9 is 83.733 hrs
Explanation:
Given the data in the question;
treatment time t₁ = 11.3 hours
Carbon concentration = 0.444 wt%
thickness at surface x₁ = 1.8 mm = 0.0018 m
thickness at identical steel x₂ = 4.9 mm = 0.0049 m
Now, Using Fick's second law inform of diffusion
\(x^2\) / Dt = constant
where D is constant
then
\(x^2\) / t = constant
\(x^2_1\) / t₁ = \(x^2_2\) / t₂
\(x^2_1\) t₂ = t₁\(x^2_2\)
t₂ = t₁\(x^2_2\) / \(x^2_1\)
t₂ = (\(x^2_2\) / \(x^2_1\))t₁
t₂ = \((\) \(x_2\) / \(x_1\) \()^2\) × t₁
so we substitute
t₂ = \((\) 0.0049 / 0.0018 \()^2\) × 11.3 hrs
t₂ = 7.41 × 11.3 hrs
t₂ = 83.733 hrs
Therefore, the required time to achieve the same concentration at a 4.9 is 83.733 hrs
What motivated software engineers to move from the waterfall model to the incremental or spiral model
Answers
Answer:
1. They needed to develop multiple components in software programs.
2. The ability to overlap the development to be more evolutionary in nature.
3. The need to be more risk-averse or the unwillingness to take risks led to the use of a spiral model.
Explanation:
Software development life cycle (SDLC) can be defined as a strategic process or methodology that defines the key steps or stages for creating and implementing high quality software applications.
In SDLC, a waterfall model can be defined as a process which involves sequentially breaking the software development into linear phases. Thus, the development phase takes a downward flow like a waterfall and as such each phase must be completed before starting another without any overlap in the process.
An incremental model refers to the process in which the requirements or criteria of the software development is divided into many standalone modules until the program is completed.
Also, a spiral model can be defined as an evolutionary SDLC that is risk-driven in nature and typically comprises of both an iterative and a waterfall model. Spiral model of SDLC consist of these phases; planning, risk analysis, engineering and evaluation.
What motivated software engineers to move from the waterfall model to the incremental or spiral model is actually due to the following fact;
They needed to develop multiple components in software programs. The ability to overlap the development to be more evolutionary in nature. The need to be more risk-averse or the unwillingness to take risks led to the use of a spiral model.Fast fourier transforms (FFT) are algorithms that speed up the computation of fourier coefficients compared to the traditional direct form discuss how the speed up is achieved
Answers
Answer:
Fast Fourier ( FFT ) algorithms speed up computation of Fourier coefficients by simply reducing the the computing time of a traditional direct form Fourier series. it achieves this by breaking complex DFTS into smaller DFTS to reduce its complexity and in turn reduce its computing time
Explanation:
Fast Fourier ( FFT ) algorithms speed up computation of Fourier coefficients by simply reducing the the computing time of a traditional direct form Fourier series. it achieves this by breaking complex DFTS into smaller DFTS to reduce its complexity and in turn reduce its computing time. an example of such FFT is Cooley-Tukey algorithm
he crimping tool is used to crimp the end of the wire E. If a force of 25.6 lb is applied to the handles, determine the average shear stress (in ksi) in the pin at B. The pin is subjected to single shear and has a diameter of 0.28 in. Only vertical force is exerted on the wire. Note: You answer should include requested units and be to 3 decimal places.
Answers
Answer:
Shear Stress = 0.415 ksi
Explanation:
In order to find the shear stress we first need to find the cross sectional area of pin B. The area is given as follows:
A = πd²/4
where,
A = Area of cross section of pin = ?
d = diameter of pin = 0.28 in
Therefore,
A = π(0.28 in)²/4
A = 0.0615 in²
Now, the shear stress is given as:
Shear Stress = Shear Force/Area
Shear Stress = 25.6 lb/0.0615 in²
Shear Stress = 415.8 psi
Shear Stress = 0.415 ksi
These are sites that allow you to upload and download media content such as images, audio, and video
Answers
A 300-mm diameter concrete pipe is laid on a slope of 1m per 500m and is required to carry water at the rate 0.05 cu.m. / s. determine the normal depth of flow. use roughness coefficient
Answers
The normal depth of flow for a 300-mm diameter concrete pipe laid on a slope of 1m per 500m and carrying water at the rate of 0.05 cu.m. / s is 0.15 m.
How to solveThe Manning equation is:
Q = \(1/n * R^2/3 * S * 2/3\)
where:
Q is the flow rate (cu.m. / s)
n is the roughness coefficient
R is the hydraulic radius (m)
S is the slope (m/m)
In this case, the flow rate is 0.05 cu.m. / s, the roughness coefficient is 0.012, and the slope is 1/500.
The hydraulic radius can be calculated as:
R = d/4 = 0.3/4 = 0.075 m
Substituting these values into the Manning equation, we get:
0.05 = 1/0.012 * (0.075)^2/3 * 1/500 * 2/3
Solving for the hydraulic radius, we get:
R = 0.15 m
Therefore, the normal depth of flow is 0.15 m.
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Six 20 watt, 12-volt luminaires (lighting fixtures) are supplied from a small, 12-volt transformer that is 60 feet away from the fixtures. the wire used is 14 awg. what is the voltage applied to the fixtures? use k = 11.6.
Answers
If the wire used is 14 awg. The voltage applied to the fixtures is: 8.61 volts.
Voltage applied to the fixturesFirst step is to calculate the amperes using this formula
I = P ÷ E
Where:
I =load current (amperes)=?
P =Product of voltage=(6)(20)
E =Electrical circuit's=12
Let plug in the formula
I= (6)(20) ÷ 12
I=120÷12
I= 10 amps
Second step is to calculate the Voltage drop
Using this formula
Vd = [2KIL] ÷ CMA
Where:
Vd= Voltage drop( volts)=?
K=Direct current constant=11.6
I=Load current (amperes)= 10 amps
L =Length in feet=60 feet
CMA=Circular mill area= 4110
Let plug in the formula
Vd= [(2)(11.6)(10)(60)] ÷ 4110
Vd=13,920÷4110
Vd= 3.3869 volts
Third step is to calculate Voltage at fixture
Voltage at fixtures=Electrical circuit's-Voltage drop
Voltage at fixtures=12 - 3.3869
Voltage at fixtures=8.6131 volts
Voltage at fixtures=8.61 volts (Approximately)
Therefore the voltage applied to the fixtures is: 8.61 volts.
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A hollow aluminum shaft with an outside diameter of 63 mm and a wall thickness of 5 mm has an allowable shear stress of 72 mpa. Determine the maximum torque t that may be applied to the shaft.
Answers
Answer:
maximum torque of metal
Explanation:
Find the remaining trigonometric function of 0 if
Answers
Answer:
Hope this will help you
Have a good day
in mining auxiliary operations are the supplementry steps that support the production cycle . elucidate the auxiliary operations of underground mining?
Answers
Answer:
The answer is below
Explanation:
The mining auxiliary operations in underground mining involve various activities that are important for a successful mining operation particularly in the areas of productive operating conditions.
The activities involved in the auxiliary operations in underground mining include the following: ventilation, haulage, drainage, power supply, lighting, delivery of compressed air, water, supplies to the working sections, and communications.
2. A F-22 Raptor has just climbed through an altitude of 9,874 m at 1,567 kph when a disk
ruptures in a sensitive piece of optical equipment. As the engineer analyzing the failure
determined the pressure differential across the sensor housing if the inside sensor pressure was
122 kPa.
Answers
The pressure difference across the sensor housing will be "95 kPa".
According to the question, the values are:
Altitude,
9874Speed,
1567 kphPressure,
122 kPaThe temperature will be:
→ \(T = 15.04-[0.00649(9874)]\)
→ \(= 15.04-64.082\)
→ \(= -49.042^{\circ} C\)
now,
→ \(P_o = 101.29[\frac{(-49.042+273.1)}{288.08} ]^{(5.256)}\)
→ \(= 27.074\)
hence,
→ The pressure differential will be:
= \(122-27\)
= \(95 \ kPa\)
Thus the above solution is correct.
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Which of the following TWO choices would be TRUE characteristics of "democratic" systems of government?
Group of answer choices
Loyalty to a leader
Equal Opportunity
No Due Process
Limited Free Speech
Free and Open Elections
Answers
The TWO alternatives would be Genuine hallmarks of "democratic" forms of government: equal opportunity and free and open elections.
What are the two types of democracy that are most prevalent?The two types of democracy that are most prevalent now are representative democracy and indirect democracy. When citizens choose representatives to enact laws on their behalf, this is known as indirect democracy or representative democracy.
What two forms of democratic government exist?A representative democracy that upholds the rule of law and protects people's rights to their property is referred to as a liberal democracy. The ability of elected representatives to rule however they choose is weakly or not at all constrained in an illiberal democracy.
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1. What does the designation w21x68 refer to in a steel beam? [explain (w) and (21) and (68)] 2. What is the difference between shear and moment connections? 3. What is composite construction and what are the advantages? 4. What are the advantages/ disadvantages of steel structure with respect to fire, and how can the disadvantages be overcome? provide examples. 5. What is an open web steel joist, and how is the lightweight steel decking attached? 6. Sketch a web joist
Answers
The answer response are:
1. In a steel beam, the designation w21x68 refers to its size and shape. The "W" stands for wide flange and the number "21" indicates the depth of the beam in inches. The weight per foot of the beam is approximately 68 pounds.
2. Shear connections are designed to resist shear forces in a beam, while moment connections are designed to resist bending moments. Shear connections typically have bolts or welds connecting the beam to the supporting column, while moment connections have additional plates and bolts to provide extra strength against bending moments.
3. Composite construction is a type of building construction that combines two materials, usually steel and concrete, to create a more efficient and cost-effective structure. The advantages of composite construction include increased strength and stiffness, improved fire resistance, and reduced construction time and costs.
4. Steel structures have the advantage of being strong and durable, but they can also be vulnerable to fire due to their high melting point. To overcome this disadvantage, steel structures can be coated with fire-resistant materials or designed with additional fire protection measures, such as sprinkler systems or fire-resistant insulation. An example of a steel structure that has been designed for fire resistance is the World Trade Center in New York City.
5. An open web steel joist is a type of steel beam that has a web consisting of a series of smaller steel bars or rods. The lightweight steel decking is attached to the joist using special clips or fasteners that are designed to hold the decking securely in place.
What is the steel beam about?A steel beam is a structural element made of steel that is used to support heavy loads in construction and engineering projects. Steel beams come in a variety of shapes and sizes, including I-beams, H-beams, and wide flange beams.
Therefore, They are designed to resist bending and shearing forces, and are often used to span long distances or support the weight of other structural components, such as floors, roofs, and walls. Steel beams are popular in construction due to their strength, durability, and versatility, and can be found in a wide range of buildings, from skyscrapers to residential homes.
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giúp em làm câu này với ạ em cám ơn em cần gấp lắm
Answers
Answer:
the problem I see real people here to have that much respect that is not going in that direction or the best.
For an electrical system, short dashed lines indicate?
Answers
A solid line around a component indicates that the component is complete. A dashed line around the component indicates that the component is being shown is not complete.
when must a competent person conduct an inspection of a sling?
Answers
Before each use and at least once every 12 months, a sling must be inspected by a qualified person.
What is a sling?An arm that has been hurt is supported with a sling, a bandage. Applying a sling Hold the arm still above and below the injury.
To create the sling, place the triangle bandage beneath the hurt arm and over the shoulder that is not hurt. Sling ends should be tied at the side of the neck.
A competent person should also examine a sling following any incident that might compromise its integrity, such as dropping it or exposing it to a potentially damaging environment.
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A competent person inspects a sling before each use and upon change in application. Periodic inspections are conducted based on frequency and conditions of use. If wear or damage is detected, the sling is removed from service.
Explanation:A
competent person
must conduct an inspection of a sling before each shift begins and whenever there is a change in the sling's application that could affect its operation. Additionally, a
periodic inspection
should be performed at intervals based on frequency of use, severity of service conditions, nature of lifts being made, and experience gained from the service life of slings used in similar circumstances. Factors to consider include visible damage, wear, deformation and increase in length. If any of these are detected, the sling should be removed from service.
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