a) For a dual core machine, write a skeleton code where you allow multiple threads for POSIX system to get average of N numbers. Write the skeleton of code where two processes share 6 variable locations and all addresses can be used. b)
Answers
A dual-core machine refers to a computer system that has two central processing units (CPUs) or cores.
Each core can execute instructions independently and concurrently, allowing for parallel processing. POSIX (Portable Operating System Interface) is a standard interface for operating systems, including thread management. To utilize multiple threads on a dual-core machine using POSIX, you can employ the pthread library, which provides functions for creating and managing threads. By creating multiple threads, each thread can perform a portion of the desired task concurrently, such as calculating the average of N numbers. In the given skeleton code, the pthread library is used to create two threads. Each thread calculates the average of a specific portion of the number array, and the partial averages are then combined to obtain the overall average. The pthread_create function is used to create threads, and pthread_join is used to wait for each thread to complete its execution. By utilizing multiple threads in this manner, the workload can be divided among the available cores, enabling parallel execution and potentially improving performance.
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Related Questions
Need help solving math problem using integration
Answers
Which of the following power tools has a revolving vertical shaft and a cutter? *
1 point
a) saber saw
b) router
c) miter saw
d) circular saw
Answers
The tool that has a revolving vertical shaft and a cutter is a router. The correct option is b.
What are power tools?There are many different kinds of power tools, including portable power tools like a circular saw, heat guns, and wall chasers as well as electrical power tools like impact wrenches, lathes, power drills, power ratchet sets, and power saws.
Power tools including circular saws, jigsaws, drills, hammer drills, sanders, grinders, routers, and many others reduce labor and time requirements. The requirement for knowledge of the risks that power tools provide if used improperly is raised due to their rising use.
A power tool called a router has a flat base and a spinning blade that protrudes beyond the base. An electric motor or a pneumatic motor can drive the spindle.
Therefore, the correct option is b) router.
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Average age in a population. Suppose the 100-vector x represents the distribution of ages in some population of people, with xi being the number of i−1 year olds, for i = 1, . . . , 100. (You can assume that x 6= 0, and that there is no one in the population over age 99.) Find expressions, using vector notation, for the following quantities. (a) The total number of people in the population. (b) The total number of people in the population age 65 and over. (c) The average age of the population. (You can use ordinary division of numbers in your expression.)
Answers
(a) We can just add up all the xi and get 100 x −1. (b) Let's suppose we want to find y, such that \frac{y}{100} is an unbiased estimate for \frac{\sum_{i=1}^{100}x_i}{100}. Then \frac{y}{100} = \frac{\sum_{i=1}^{100}x_i}{100}. Let's now plug in 100 x −1 for \sum_{i=1}^{100}x_i. This means y = \frac{99 x −1}{100}. (c) Recall that the average of a vector is 0 x + 1. Then the average age of the population is 0(100 − 1) + 1 = 50. (d) No, because \frac{y}{100} ≠ \frac{\sum_{i=1}^{100}x_i}{100}.
(a) The total number of people in the population is 100 x −1. (b) Let's suppose we want to find y, such that \frac{y}{100} is an unbiased estimate for \frac{\sum_{i=1}^{100}x_i}{100}. Then \frac{y}{100} = \frac{\sum_{i=1}^{100}x_i}{100}. Let's now plug in 100 x −1 for \sum_{i=1}^{100}x_i. This means y = \frac{99 x −1}{100}. (c) Recall that the average of a vector is 0 x + 1. Then the average age of the population is 0(100 − 1) + 1 = 50. (d) An unbiased estimate for the average age of the population exists, because \frac{y}{100} ≠ \frac{\sum_{i=1}^{100}x_i}{100}.
50 People are 65 and over
The number of people who are 65 and older is 50 x − 1 = 45.
I think this may be either (b) or (c). An unbiased estimate for the average age of the population exists because \frac{y}{100} ≠ \frac{\sum_{i=1}^{100}x_i}{100}. An unbiased estimate is \frac{99 x −1}{100}.
(c) Recall that the average of a vector is 0 x + 1. Then the average age of the population is 50. (b) Let's suppose we want to find y, such that \frac{y}{100} is an unbiased estimate for \frac{\sum_{i=1}^{100}x_i}{100}. Then \frac{y}{100} = \frac{\sum_{i=1}^{100}x_i}{100}. Let's now plug in 100 x −1 for \sum_{i=1}^{100}x_i. This means y = \frac{99 x −1}{100}. (d) No, because \frac{y}{100} ≠ \frac{\sum_{i=1}^{100}x_i}{100}.
45 People are 65 and over
The number of people who are 65 and older is 45. There is no unbiased estimate for the average age of a population.
(b) Let's suppose we want to find y, such that \frac{y}{100} is an unbiased estimate for \frac{\sum_{i=1}^{100}x_i}{100}. Then \frac{y}{100} = \frac{\sum_{i=1}^{100}x_i}{100}. Let's now plug in 100 x −1 for \sum_{i=1}^{100}x_i. This means y = \frac{99 x − 1}{100}. (c) Recall that the average of a vector is 0 x + 1. Then the average age of the population is \frac{99 x −1}{100}. (d) An unbiased estimate for the average age of a population exists, because \frac{y}{100} ≠ \frac{\sum_{i=1}^{100}x_i}{100}.
5. Refrigeration refers to space temperatures that are below
What the correct answer?
Answers
Explanation:
The term refrigeration means cooling a space, substance or system to lower and/or maintain its temperature below the ambient one (while the removed heat is rejected at a higher temperature). In other words, refrigeration is artificial (human-made) cooling.
Refrigeration, is the act of removing undesirable heat from one thing, substance, or space and transferring it to another object, substance, or space.
What is refrigeration?Refrigeration refers to the process of chilling an area, material, or system in order to decrease and or keep its temperature below that of the surrounding environment.
Refrigeration, sometimes known as chilling, is the act of removing undesired heat from one item, substance, or area and transferring it to another.
The temperature can be lowered by using ice, snow, cooled water, or mechanical refrigeration to remove heat.
Hence,refrigeration, is the act of removing undesirable heat.
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what speeds did john j montgomerys gliders reach
Answers
Answer: 68 mph
Explanation:
Can I get an answer to this question please
Answers
Answer:
(i) 12 V in series with 18 Ω.
(ii) 0.4 A; 1.92 W
(iii) 1,152 J
(iv) 18Ω — maximum power transfer theorem
Explanation:
(i)As seen by the load, the equivalent source impedance is ...
10 Ω + (24 Ω || 12 Ω) = (10 +(24·12)/(24+12)) Ω = 18 Ω
The open-circuit voltage seen by the load is ...
(36 V)(12/(24 +12)) = 12 V
The Thevenin's equivalent source seen by the load is 12 V in series with 18 Ω.
__
(ii)The load current is ...
(12 V)/(18 Ω +12 Ω) = 12/30 A = 0.4 A . . . . load current
The load power is ...
P = I^2·R = (0.4 A)^2·(12 Ω) = 1.92 W . . . . load power
__
(iii)10 minutes is 600 seconds. At the rate of 1.92 J/s, the electrical energy delivered is ...
(600 s)(1.92 J/s) = 1,152 J
__
(iv)The load resistance that will draw maximum power is equal to the source resistance: 18 Ω. This is the conclusion of the Maximum Power Transfer theorem.
The power transferred to 18 Ω is ...
((12 V)/(18 Ω +18 Ω))^2·(18 Ω) = 144/72 W = 2 W
Wich muscle in your body are affected by alcohol first
Answers
Answer:
Brain
Explanation:
Thirty seconds after your first sip, alcohol races into your brain. It slows down the chemicals and pathways that your brain cells use to send messages. That alters your mood, slows your reflexes, and throws off your balance.What is the real name of the town that Bud & Bugs stayed in while they were waiting for the train?
Group of answer choices
Hooverville
Chicago
Hooperville
Memphis
Answers
Answer: Hooverville
Explanation:
Bud, not Buddy is a book about a ten years old boy who ran away from home where he stayed with his foster parents. He was treated unfairly and beaten.
He left home to seek a better living and hope that he will find his father as well. He met another orphan named Bugs and they decided to go to Hooverville so that they can get a train going to California.
Suppose that 42\%42%42, percent of students of a high school play video games at least once a month. The computer programming club takes an SRS of 303030 students from the population of 792792792 students at the school and finds that 40\%40%40, percent of students sampled play video games at least once a month. The club plans to take more samples like this. Let \hat p p ^ p, with, hat, on top represent the proportion of a sample of 303030 students who play video games at least once a month. What are the mean and standard deviation of the sampling distribution of \hat p p ^ p, with, hat, on top? Choose 1 answer: Choose 1 answer: (Choice A) A \begin{aligned} \mu_{\hat p}&=0.42 \\\\ \sigma_{\hat p}&=\sqrt{\dfrac{0.42\left(0.58\right)}{30}} \end{aligned} μ p ^ σ p ^ =0.42 = 30 0.42(0.58) (Choice B) B \begin{aligned} \mu_{\hat p}&=(30)(0.42) \\\\ \sigma_{\hat p}&=\sqrt{30(0.42)(0.58)} \end{aligned} μ p ^ σ p ^ =(30)(0.42) = 30(0.42)(0.58) (Choice C) C \begin{aligned} \mu_{\hat p}&=(30)(0.4) \\\\ \sigma_{\hat p}&=\sqrt{30(0.4)(0.6)} \end{aligned} μ p ^ σ p ^ =(30)(0.4) = 30(0.4)(0.6) (Choice D) D \begin{aligned} \mu_{\hat p}&=0.4 \\\\ \sigma_{\hat p}&=\sqrt{\dfrac{0.4\left(0.6\right)}{30}} \end{aligned} μ p ^ σ p ^ =0.4 = 30 0.4(0.6)
Answers
Answer:
its A, first choice on khan
Explanation:
Consider the following two-dimensional velocity field V = (u,v)
u = 3x+c1y
v= x + c2y
Where c1 and c2 are coffients.
Required:
a. Determine all stagnation points.
b. Determine the coefficients C1, C2 such that the flow is a potential flow.
c. For the values of the coefficients calculated at point (b), determine the expression of the stream function.
d. For the values of the coefficients calculated at point (b), considering a temperature field T = 2x + 3y, determine the value of (v.v)T at the point (x,y) = (1,2)
Answers
Answer:
a) C1 = 3C2
b) C1 = 1 , C2 = -3
c) \(w = \frac{-x^2}{2} + \frac{y^2}{2} + 3xy + C\)
d) (v.v)T = 0
Explanation:
u = 3x + C1y
v = x + C2y
A) determining all stagnation points
At The stagnation points : u = 0, v = 0
for all values of C1 and C2 , C1 = 3C2
B) The coefficients of C1 and C2 so that the flow is potential
C1 = 1 , C2 = -3
C) Determine the expression of the stream function
\(w = \frac{-x^2}{2} +\frac{y^2}{2} +3xy+ C\)
D) The value of (v.v)T at the point (x,y) = (1,2)
(v.v)T = 0
Attached is the detailed solution
A motorcycle patrolman starts from rest at A two seconds after a car, speeding at the constant rate of 120 km/h, passes point A. If the patrolman acceler- ates at the rate of 6 m/s² until he reaches his maxi- mum permissible speed of 150 km/h, which he maintains, calculate the distance s from point A to the point at which he overtakes the car.
Answers
The distance, s from point A to the point at which he overtakes the car is 912 meters.
What is the formula for calculating the distance?Distance may be defined as the total movement of an object without any regard for direction. It is a type of scalar quantity. The formula for calculating the distance is as follows:
Distance = speed/time taken.According to the context of this question,
The speed of motorcycle patrolman = 120 km/h = 120 × 5/18 = 33.33 m/sec.
The maximum permissible speed = 150 km/h = 150 ×5/18 = 41.66 m/sec.
So, at the speed of 6 m/s², it takes 6.94 seconds.
The distance traveled in 6.94 sec = 1/2 (6)\((6.94)^2\) = 144.67 m.
So, the cop overtakes the car when at,
33.333t = 144.67 + 41.666(t-2-6.9444)
t = 27.362 seconds.
Now, the distance, s from point A to the point at which he overtakes the car = car(27.362) = 33.333*27.362 = 912m.
Therefore, the distance, s from point A to the point at which he overtakes the car is 912 meters.
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"Task 4: Explosions 4 (a) What type of explosion could occur
inside the reactor vessel? (1) (b) Describe how an explosion could
occur in the reactor vessel during the cleaning operation. (12)
Answers
(a) The type of explosion that could occur inside the reactor vessel depends on the circumstances, but a criticality accident is one potential type in a nuclear reactor.
(b) An explosion during cleaning operations in the reactor vessel can happen due to flammable gas buildup, ignition sources, or vessel containment failure.
(a) The type of explosion that could occur inside the reactor vessel depends on the specific circumstances and materials involved.
In a nuclear reactor, a nuclear explosion, known as a criticality accident, is one potential type of explosion that can happen if there is an uncontrolled chain reaction of nuclear fission.
(b) An explosion in the reactor vessel during the cleaning operation can occur due to various factors.
If there is a breach or failure in the vessel's containment structure, allowing high-pressure gases or steam to accumulate, an explosion may happen when the pressure exceeds the vessel's capacity.
Proper safety measures and protocols, including careful handling of hazardous materials, maintaining appropriate ventilation, and rigorous inspection of the vessel's integrity, are essential to prevent such explosions during cleaning operations.
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Which of the following occupations is the most physically dangerous?
O electrician
O Ironworker
O boilermaker
O cement mason
Answers
Answer:Ironworker
Explanation:
Their work is totally physical and lead they get hampered by lead most
Answer:
answer:ironworker
Explanation:
they can be hampered and can also get severely injured.
What time will current of 10A transferred from a charges of 50C
Answers
Answer:
8×10^-19 seconds
Explanation:
i=∆q/∆t
=> ∆t=∆q/i=50×1.6×10^-19/10=8×10^-19(s)
Cellular network towers are configured in such a way so that they avoid what type of problem?
Answers
Answer:
They are configured this way to avoid overlap issues.
Explanation:
Technician a says amperage is the same at any point in a series circuit. technician b says the total resistance is the sum of all resistance in a series circuit. who is correct?
Answers
Consequently, based on the explanations provided, Technician B is correct in asserting that the total resistance in a series circuit is the sum of all the resistances within that circuit.
Technician A and Technician B present two different statements regarding series circuits. Technician A claims that amperage is consistent at any point in a series circuit, while Technician B argues that the total resistance is the cumulative sum of all resistances in a series circuit.
According to Technician A, in a series circuit, where there is only one path for current flow, the amperage remains constant throughout the circuit. This implies that the current is identical at any point in the circuit. Thus, Technician A's statement regarding amperage in a series circuit is accurate.
Technician B's statement pertains to the total resistance in a series circuit. In this type of circuit, the total resistance is obtained by summing up all the individual resistances within the circuit. When resistors are connected in series, their resistances add up. Technician B's claim about the total resistance being the sum of all resistances in a series circuit is correct.
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A masonry chimney should be braced with horizontal metal straps every few feet against the structure and into reinforced points such as wall studs to stabilize the chimney from the shaking force of an earthquake.
a. True
b. False
Answers
Answer: True
Explanation:
The statement that "a masonry chimney should be braced with horizontal metal straps every few feet against the structure and into reinforced points such as wall studs to stabilize the chimney from the shaking force of an earthquake" is true.
In a scenario whereby the chimney isn't braced with the horizontal metal straps every few feet, this can lead to its collapse in case of an earthquake. Therefore, the correct option is "true".
Consider a mild steel specimen with yield strength of 43.5 ksi and Young's modulus of 29,000 ksi. It is stretched up to a point where the strain in the specimen is 0.2% (or 0.002). If the specimen is unloaded (i.e. load reduces to zero), the residual strain (or permanent set) is: 0.05% 0.1% 0% 0.2%
Answers
Answer:
0.05%
Explanation:
From the question, we have;
The yield strength of the mild steel, \(\sigma _c\) = 43.5 ksi
Young's modulus of elasticity, ∈ = 29,000 ksi
The total strain, \(\epsilon _c\) = 0.2% = 0.002
The inelatic strain \(\epsilon_c^{in}\) is given as follows;
\(\epsilon_c^{in}\) = \(\epsilon _c\) - \(\sigma _c\)/∈
Therefore, we have;
\(\epsilon_c^{in}\) = 0.002 - 43.5/(29,000) = 0.0005
Therefore, the inelastic strain, \(\epsilon_c^{in}\) = 0.0005 = 0.05%
Taking the inelastic strain as the residual strain, we have;
The residual strain = 0.05%
How do birds achieve take-off, gliding, dive, etc.? How do they modify their body shape?
Answers
Question:
Why is my step-sis stuck in the washing machine every day?
———————————————————————————————-
Please, answer quick! I really need help figuring this out.
Answers
Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead89
I am new to Django and didn't find any reference regarding this issue. I am getting this error when i use many to many field in Django model (models.py). I guess the issue is assigning m2m field in view(views.py) from form(forms.py).
How to assign m2m field in view? (Django version 2.0, python - 3.5)
models.py
class User(AbstractUser):
username=models.CharField(max_length=20)
email = models.EmailField(_('email address'), unique=True)
class Setupuser(models.Model):
organization=models.CharField(max_length=200,blank=False,null=True)
emails_for_help = models.ManyToManyField(User)
views.py
class Set_user(FormView):
template_name="pkm_templates/set_up_user.html"
form_class = Set_User_Form
success_url = '/thanks/'
def form_valid(self, form):
org = form.cleaned_data.get('organization')
emails = form.cleaned_data.get("emails_for_help")
instance = Setupuser(organization=org,emails_for_help=emails)
instance.save()
return redirect("/")
forms.py
class Set_User_Form(ModelForm):
emails_for_help = forms.ModelMultipleChoiceField(
queryset=User.objects.all(),
widget=forms.CheckboxSelectMultiple
)
class Meta:
model = Setupuser
fields = ["organization","emails_for_help"]
Answers
Using the knowledge in computational language in python it is possible to write a code that Use emails_for_help.set() instead89 I am new to Django.
Writing the codeA high-level, all-purpose programming language is Python. Code readability is prioritized in its design philosophy, which makes heavy use of indentation.
class User(AbstractUser): username=models.CharField(max_length=20) email = models.EmailField(_('email address'), unique=True)class Setupuser(models.Model): organization=models.CharField(max_length=200,blank=False,null=True) emails_for_help = models.ManyToManyField(User)class Set_user(FormView):
template_name="pkm_templates/set_up_user.html" form_class = Set_User_Form success_url = '/thanks/' def form_valid(self, form): org = form.cleaned_data.get('organization') emails = form.cleaned_data.get("emails_for_help")
instance = Setupuser(organization=org,emails_for_help=emails) instance.save() return redirect("/")class Set_User_Form(ModelForm): emails_for_help = forms.Model
MultipleChoiceField( queryset=User.objects.all(), widget=forms.CheckboxSelectMultiple ) class Meta: model = Setupuser fields = ["organization","emails_for_help"]
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a storage tank contains liquid with a density of 0.0361 lbs per cubic inch. the height of liquid in the tank is 168 feet. what is the pressure of the liquid at the bottom of the tank give your answer in psi
Answers
Answer:
Objects that float on water have densities less than the density of water; those that do not float on water have densisties greater than the density of water:
Float on water: d < 0.0361 lb/in³ (where d denotes denisity)
Do not float on water: d > 0.0361 lb/in³
Explanation:
I don't know if this works for it or not?
a risk that happens when populations severely overextend the carrying capacity of their environment.
A) RESOURCE GROWTH
B) CATASTROPHIC COLLAPSE
C)DEMOGRAPHIC TRANSITION
D)INCREASED POPULATION GROWTH
Answers
8. What is the density of an object with a mass of 290.5 g and volume of 83 cm 3?
Answers
The density would be 218.5
Write short Note about
a. Deflecting Torque
b. Controlling Torque
c. Damping Torque.
Answers
a. Deflecting Torque:
Deflecting torque refers to the torque exerted on a moving system, such as a galvanometer or a motor, due to an external force or a magnetic field. It is responsible for deflecting the system from its equilibrium position.
In the case of a galvanometer, the deflecting torque is given by the equation:
T_deflect = k * I * B * sin(θ),
where T_deflect is the deflecting torque, k is a constant specific to the galvanometer, I is the current passing through the coil, B is the magnetic field strength, and θ is the angle between the coil and the magnetic field.
b. Controlling Torque:
Controlling torque is the torque applied to a system to bring it back to its equilibrium position and counteract the deflecting torque. It helps in maintaining stability and accuracy in the system's operation.
The controlling torque can be calculated using the equation:
T_control = -k * θ,
where T_control is the controlling torque, k is the torsional constant of the system, and θ is the angular displacement from the equilibrium position.
c. Damping Torque:
Damping torque is a torque that opposes the motion of a system and reduces oscillations or overshooting. It is responsible for controlling the speed of the system and bringing it to a stop.
The damping torque is given by the equation:
T_damping = -b * ω,
where T_damping is the damping torque, b is the damping constant of the system, and ω is the angular velocity.
Deflecting torque, controlling torque, and damping torque play crucial roles in various systems. The deflecting torque deflects the system from its equilibrium position, while the controlling torque brings it back to equilibrium. The damping torque helps in reducing oscillations and controlling the speed of the system. Understanding and managing these torques are essential for the proper functioning and stability of mechanical and electrical systems.
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An air-conditioning system is used to maintain a house at a constant temperature of 20 °C. The house is gaining heat from outdoors at a rate of 20000 kJ/h, and the heat generated in the house from the people, lights, and appliances amounts to 8000 kJ/h. For a COP of 2.5, determine the required power input to this air-conditioning system.
Answers
The required power input to this air-conditioning system is 3.11kW
How to solve for the required power inputWe would have to calculate the cooling load of the airconditioner first
This is given as
Q outdoors + Q house
In the question
Q outdoors = 20000
Q house = 8000 kJ/h
Cooling load = 20000 kJ/h + 8000 kJ/h
= 28000 kJ/h
Next we have to solve for the power input into the house
28000 / 2.5
= 11200 kJ/h
11200 kJ/h ÷ 1 / 3600
= 3.11kW
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ký hiệu của vật liệu cơ khí
Answers
Answer:
by hìuuf5ëcz
Explanation:
6tgiïuggd
A vibration system consists of a mass 50 kg, a spring of stiffness 30 kN/m and a damper. The
damping provided is only 20% of the critical value. Determine (a) the damping factor, (b) the
critical damping coefficient, (c) the natural frequency of the damped vibrations, (d) the
logarithmic decrement and (e) the ratio of two consecutive amplitudes.
Answers
Answer:
20% of the critical value. Determine (a) the damping factor, (b) the
Explanation:
what is the term RF exiciter?
Answers
Hope this helps :)))
Using six bits, Show the binary counting sequence from 000000 to 111111
Answers
Answer:
Explanation:
The least significant unit bits switch from 0 → 1 or 1 → 0 with each count.
The next bit(two-position) which is the second bit usually be at 0s for two counts and at 1s at two counts. The third bit (four positions) usually be at 0s for four counts and then at 1 for four counts. etc. The fourth bit (eight positions) usually be at 0s for eight counts and then at 1 for eight counts and so on. The fifth bit (sixteen positions) usually be at 0s for sixteen counts and then at 1 for sixteen counts and so on. The sixth bit (thirty-two positions) usually be at 0s for thirty-two counts and then at 1 for thirty-two counts and so on in the sequence of six-bit binary counting.
From the document attached below, we can see a document file showing the binary counts sequences from 000000 to 111111.