4- Consider a refrigerator that consumes 320 W of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $0.13/kWh, the electricity cost of this refrigerator per month (30 days) is (a) $4.9 (b) $5.8 (c) $7.5 (d) $8.3 (e) $9.7
Answers
The electricity cost of the refrigerator per month, running only one quarter of the time, is : option (a) $4.9.
The power consumed by the refrigerator, P = 320 W
Unit cost of electricity, C = $0.13/kWh
Let the time for which the refrigerator runs in a day = t.
The total time taken by the refrigerator for running in 30 days = 30t.
We know that,Energy consumed = power x time. Therefore,The energy consumed by the refrigerator in
30 days = P × 30t = 320 × 30t = 9600t Wh
The electricity cost for 1 kWh = $0.13
Therefore, the electricity cost for 9600t Wh = $0.13 × 9600t = 1248t cents
We know that, 100 cents = $1
Therefore, the electricity cost for 9600t Wh = 12.48t $For 24 hours, the refrigerator runs 1/4th of the time.So,
t = (1/4) × 24 = 6 hours = 0.25 days
Therefore, The energy consumed by the refrigerator in 30 days = 9600t Wh = 9600 × 0.25 Wh = 2400 Wh = 2.4 kWh
The electricity cost for 2.4 kWh = 2.4 × 0.13 = $0.312Therefore, the main answer is option (a) $4.9.
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Related Questions
What was the reason alloys were used instead of metals like copper, tin, or iron?
A. They were cheaper to create
B. they were stronger and more durable
C. they were more visually appealing
D. they were lighter and easier to use
Answers
Alloys were stronger and more durable
When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
Answers
Answer:
120 Hz
Explanation:
Given that a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, what will be the output frequency ?
Ideally, the supply frequency will be equal to the ripple frequency.
But in a half - way rectifier, the out put frequency is twice the input sinusoidal voltage frequency.
The output frequency = 2 × 60
Output frequency = 120 Hz
Therefore, When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is 120 Hz.
The output frequency produced by the 60Hz input into the half - wave rectifier would be 120 Hz
Given the parameters :
Sinusoidal voltage = 60 Hz Rectifier = Half-waveOutput frequency for an half-wave rectifier input will be two times the input frequency.
Hence, the output frequency can be calculated thus :
Output frequency = 2 × input frequencyOutput frequency = 2 × 60 = 120 Hz
Therefore, the output frequency of the half-wave rectifier is 120 Hz.
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Does Layout inspection in IATF includes sub-components of a product?
Answers
Yes, the layout inspection in IATF (International Automotive Task Force) includes sub-components of a product. The layout inspection is a part of the production part approval process (PPAP) that is required for automotive parts suppliers to demonstrate their ability to meet customer requirements.
The purpose of the layout inspection is to ensure that the parts or components produced meet the dimensional and other specifications and requirements specified by the customer. This includes the inspection of sub-components as well as the final product.
The layout inspection typically involves measuring the dimensions and tolerances of the parts or components using tools such as coordinate measuring machines (CMMs) and gauges. The results of the inspection are then compared to the specifications and requirements specified by the customer to ensure that the parts or components are within the acceptable range.
In summary, the layout inspection in IATF includes sub-components of a product to ensure that all parts or components meet the specified requirements and specifications.
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Determine the maximum shear stress in the beam and the minimum yield strength that should be considered to obtain a minimum factor of safety of 2 based on the distortion-energy theory. The maximum shear stress in the beam is 1875 Numeric ResponseEdit Unavailable. 1875 correct.psi. The minimum yield strength based on the distortion-energy theory is
Answers
Answer: hello some parts of your question is missing attached below is the missing part
max shear stress = 1875 psi
minimum yield strength = 14911.76 psi
Explanation:
Since The maximum shear stress in the Beam is already given as 1875 psi , I will calculate for the minimum yield strength
Determine minimum yield strength
attached below is the detailed solution
minimum yield strength = 14911.76 psi
What is the maximum height at which a scaffold should be placed?
Answers
According to OSHA standards, scaffolds should be placed at the highest height that is consistent with their safe use. The maximum height of a scaffold depends on a number of factors, including the type of scaffold, the intended use of the scaffold, and the weight and stability of the scaffold.
A scaffold is a temporary structure that is used to support people and materials during construction or maintenance work. Scaffolding is commonly used in construction, renovation, and maintenance projects to provide workers with a safe, stable platform from which to work.
Types of scaffolds There are many different types of scaffolds, including: Frame scaffolds, which consist of a platform supported by a frame of steel or aluminum tubes.
Suspension scaffolds, which hang from cables and are used for work on tall buildings or structures. Cantilever scaffolds, which extend out from the building or structure they are supporting.
Mobile scaffolds, which can be moved around a job site as needed. Know more about the Scaffold Safety Standards published by OSHA.
In general, OSHA requires that scaffolds be erected and used in accordance with the manufacturer's instructions, as well as the following standards:
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Is a 10 foot ladder long enough to safely reach a landing that is 9 feet above the adjacent floor
Answers
Answer:
Definitely not
Explanation:
You should have 1-2 feet of extra ladder on a flat surface so 1 foot on an adjacent floor is a no no
tech a says that a loaded ball joint supports the weight of the vehicle. tech b says that a ball joint in a macpherson strut suspension is a follower joint (not loaded). who is correct?
Answers
Tech A says that a loaded ball joint supports the weight of the vehicle. Tech B says that a ball joint in a MacPherson strut suspension is a follower joint (not loaded). Who is correct?A ball joint is a component of the suspension system that connects the steering knuckle to the control arm, allowing for movement and rotation of the wheel.
Ball joints, like all suspension components, are classified as either loaded or follower joints, with each having a specific function.Tech A is correct: a loaded ball joint supports the weight of the vehicle. A loaded ball joint refers to a joint that carries the vehicle's weight as well as the suspension components attached to it. Loaded ball joints are found in the lower control arm of most suspension systems, where they support the weight of the vehicle and absorb the forces that arise as the wheel moves up and down.Tech B is incorrect: a ball joint in a MacPherson strut suspension is a loaded joint, not a follower joint. A MacPherson strut suspension, which is a type of independent suspension, consists of a strut assembly that houses a coil spring, shock absorber, and a ball joint. The ball joint in a MacPherson strut suspension is a loaded joint that supports the weight of the vehicle, as well as the strut assembly, spring, and other suspension components.Based on the above discussion, it can be concluded that Tech A is correct while Tech B is incorrect.
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Why does a
generally decrease
with increasing
bond energy?
Answers
Answer:
What is the real meaning of this questions
Answer:
what whatwhat whatwhat the town hall meeting at the office in the morning and I can get you a new one for the kids
what are the objective goal of a specific in a student of civil engineering
Answers
Answer:
an ability to identify, formulate, and solve engineering problems. an understanding of professional and ethical responsibility. an ability to communicate effectively. the broad education necessary to understand the impact of engineering solutions in a global, economic, environmental, and societal context
“Snow Cover Area change Analysis for Kabul Basin”
Summarize how GIS & Remote Sensing is incorporated in this study.
Answers
GIS
The full for GIS is : Geographic Information System.
The GIS is a system of mapping that is used to create, analyze, manage and map all the types of data.
It is a method capturing, checking as well as displaying all the data that is related to the position of the surface of earth.
Remote Sensing
Remote sensing is defined as a process where the various physical characteristics of an area are constantly monitored and detected by a process of measuring the reflection of the emitted radiations at ta distance.
The snow covered areas of the Kabul basin can be monitored and analyzed by using the process of GIS and remote sensing.
They provide a continuous source of information and data about snow covered peaks, the amount of snow to the authorities.
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what is Geography? pliz help
Answers
Answer:
hope it's helpful please like and Follow me
Answer:
Geography is the science that studies and describes the surface of the Earth in its physical, current and natural aspect, or as a place inhabited by humanity.
The file hash. Py contains a hash function that works on strings. That hash function works by adding up the ASCII value of each character in the string and then using modulus to ensure that number is within the range of the table. The function works fairly well for some input sets, but not always. As an example, consider a company that sells lots of different products. Each product has a product code which consists of three capital letters, and a price. The company wants to store their inventory in a hash table so they can quickly look up the price by entering the product code. We can estimate how good of a job our hash function is doing by estimating the average number of comparisons we need to make to find an item, and the max number we need to make. For a hash table that uses chaining (an array of linked lists), we can estimate this by counting how many elements are in an average list that has data in it, and how many elements are in the longest list. To do: • hash. Py uses the simple hash function described earlier to store 500 random products in a table of size 2,000. • Run it to see the number of lists being used, and what the average and max sized list are (it will print this out). • Revise the hash function of the program to spread the data out better. • You should get the average filled list to have fewer than 5 elements in it (less than 2 would be great). • The hashed value must be solely based on the value of the string, it can’t have any randomness (because we have to be able to find the item again without storing the different hash functons!). • Explain why your hash function spreads the data better.
hash_table = [[] for _ in range(2000)]
def hashing_func(key):
sum=0
for i in key:
sum=sum+ord(i);
return sum %len(hash_table)
#Inserting into the hash table
def insert(hash_table, key, value):
hash_key = hashing_func(key) % len(hash_table)
key_exists = False
bucket = hash_table[hash_key]
for i, kv in enumerate(bucket):
k, v = kv
if key == k:
key_exists = True
break
if key_exists:
bucket[i] = ((key, value))
else:
bucket. Append((key, value))
#searching an element by key
def search(hash_table, key):
hash_key = hash(key) % len(hash_table)
bucket = hash_table[hash_key]
for i, kv in enumerate(bucket):
k, v = kv
if key == k:
return v
#report how good the hashing was
def report():
max = 0
total = 0
num_filled = 0
for i in hash_table:
if len(i)>0:
num_filled=num_filled+1
total=total+len(i)
if len(i)>max:
max=len(i)
print('The table has ',total,' elements')
print(num_filled,' lists have data out of ',len(hash_table),' total')
print('The average filled list has ',total / num_filled,' elements')
print('Largest list has ',max,' elements')
Answers
To change the hash work within the given code to spread the data out way better, able to utilize a method called "polynomial rolling hash."
What is the hash function?This includes treating the string as a polynomial in a certain base (more often than not a prime number), and after that calculating the hash esteem by assessing this polynomial at a settled point
This given hash work spreads the information out way better than the past one since it takes into consideration the arrange of the characters within the string, instead of fair summing their ASCII values. This implies that two strings with the same characters completely different orders will have distinctive hash values, which decreases the probability of collisions within the hash table.
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describe how a feeler gauge can be used to assist in the adjustment of a spark plug electrode gap
Answers
Answer:
Explanation:
Adjusting the distance between the two electrodes is called gapping your spark plugs. You need a feeler gauge to gap your spark plugs properly If you're re-gapping a used plug, make sure that it's clean (gently scrub it with a wire brush)
hope this you
It is required that the resultant force acting on the eyebolt in Fig (a) be directed along the positive x axis and that F2 have a minimum magnitude. Determine this magnitude, the angle θ, and the corresponding resultant force
Answers
Answer: hello the eye bolt diagram is missing attached below is the missing diagram
i) angle = 90°
ii) magnitude ( F2 ) = 692.82
ii) Fr = 400 N
Explanation:
i) Determine the angle ∅
The ∅ = 90° since F2 to be minimum , it is directed perpendicular to the resultant force
ii) Determine the magnitude
By applying the parallelogram law of addition and triangular rule to the sketches attached below
The resultant force and the Magnitude can be calculated :
F2 = F1sin60°
= 800 * sin60° = 692.82 N
iii) Fr ( resultant force ) = F1cos60°
= 800*cos 60° = 400 N
Running ropes must be taken out of service if they have _____ broken wires in one strad in one lay
Answers
Answer:
3
Explanation:
3 broken wires in one strand in one lay are cause for removal from service.
Answer:
3Running ropes must be taken out o service if they have 3 broken wires in one strand in one lay.Identify the 3 levels of braking that precede the need to lock up your wheels?.
Answers
When it comes to driving a car, braking is a very important skill to have. Braking is the process of slowing down or stopping a moving vehicle. Knowing how to brake effectively can be the difference between avoiding a crash and causing one.
Below are the three levels of braking that precede the need to lock up your wheels:
1. Perception braking: This is the first level of braking that precedes the need to lock up your wheels. Perception braking refers to the driver's ability to recognize the need to brake in response to a situation. This type of braking is necessary when you notice a potential hazard on the road, such as a pedestrian, a cyclist, or another car. Perception braking requires that you react quickly to the situation and apply the brakes as soon as possible.
2. Controlled braking: The second level of braking that precedes the need to lock up your wheels is controlled braking. This type of braking requires that you apply the brakes firmly but smoothly. The idea is to slow down the vehicle without locking up the wheels. Controlled braking is essential when you are driving on a wet or slippery road surface, as it allows you to slow down the car without losing control.
3. Threshold braking: The third level of braking that precedes the need to lock up your wheels is threshold braking. This is the most advanced form of braking and requires a lot of skill and experience. Threshold braking involves applying the brakes to the point just before the wheels start to lock up. At this point, the driver eases off the brakes slightly to maintain traction and control. Threshold braking is the most effective form of braking in emergency situations, as it allows the driver to slow down the vehicle quickly without losing control.
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Consider an infinite wing with a NACA 1412 airfoil section and a chord length of 3 ft. The wing is at an angle of attack of 5° in an airflow velocity of 100 ft/s at standard sea-level conditions. Calculate the lift, drag, and moment about the quarter-chord per unit span.
Answers
Answer:
i) 23.9 Ib ( lift )
ii) 0.25 Ib ( drag )
iii) -2.68 ft. Ib ( moment about )
Explanation:
Given data:
Angle of attack of wing = 5°
airflow velocity = 100 ft/s
NACA 1412 airfoil section
i) calculate The lift
L = \(q_{0}\)\(sc_{1}\)
\(q_{0}\) = dynamic pressure = 11.9 Ib/ft^2 ( as calculated using \(1/2 * p_{0} * v^{2} _{0}\) )
s = area = ( 1ft ) ( c ) = ( 1 ) ( 3 ) = 3ft^2
\(c_{1}\) = lift coefficient = 0.67 ( refer to appendix D at an angle of 5° )
Hence the lift ( L) = 11.9 * 3 * 0.67 = 23.9 Ib
ii) calculate The drag
D = \(q_{0} sc_{d}\)
\(q_{0}\) = 11.9 Ib/ft^2
s = 3ft^2
Cd ( drag coefficient ) = 0.007
hence drag ( D ) = 11.9 * 3 * 0.007 = 0.25 Ib
iii) calculate Moment about
\(M_{\frac{c}{4} }\) = \(q_{0} scc_{m_{\frac{c}{4} } }\)
qo = 11.9
s = 3 ft^2
c = 3 ft
\(c_{m_{\frac{c}{4} } }\) = - 0.025
hence moment about = ( 11.9 * 3 * 3 * - 0.025 ) = -2.68 ft. Ib
The dark surface of a ceramic stove top may be approximated as a blackbody. The "burners", which are integral with the stove top, are heated from below by electric resistance heaters. Consider a burner of diameter D = 200 mm operating at a uniform surface temperature of Ts = 250°C in ambient (environment) air at T? = 20°C. Without a pot or pan on the burner, what are the rates of heat loss by radiation and convection from the burner? If the efficiency associated with the energy transfer from the heaters to the burners is 90%, what is the electric power requirement?
Answers
The electric power requirement, if the efficiency is 90% is given as 1667 W.
How to solveThe heat loss due to radiation from the stove burner can be calculated using Stefan-Boltzmann Law: Q_rad = εσA(Ts^4 - T?^4),
where ε is the emissivity (1 for a blackbody), σ is the Stefan-Boltzmann constant \((5.67 x 10^-8 W/m^2K^4)\), A is the surface area \((\pi D^2/4)\), and Ts and T? are the absolute temperatures in Kelvin.
The heat loss due to convection is calculated using Newton's law of cooling: Q_conv = hA(Ts - T?), where h is the convection heat transfer coefficient.
The value of h depends on the nature of air flow (laminar or turbulent) and is typically 10-25 W/m^2K for natural convection.
The power requirement can be found by dividing the total heat loss by the efficiency of the energy transfer.
To calculate the heat loss by radiation, we first need to convert the temperatures to Kelvin: Ts = 250°C + 273.15 = 523.15 K, T? = 20°C + 273.15 = 293.15 K.
Then apply the Stefan-Boltzmann Law:
Q_rad = εσA\((Ts^4 - T?^4)\)
=\(1 * 5.67x10^-8 W/m^2K^4\)* \((\pi *(0.2 m)^2/4) * (523.15^4 - 293.15^4)\)
≈ 1354 W.
For heat loss by convection, without a specific heat transfer coefficient (h), If we assume h=10 W/m^2K,
Q_conv = hA(Ts - T?)
= 10 W/m^2K * (π*(0.2 m)^2/4) * (523.15 - 293.15)
≈ 146 W.
The electric power requirement, if the efficiency is 90%, is the total heat loss divided by the efficiency:
Power = (Q_rad + Q_conv) / 0.9
≈ (1354 W + 146 W) / 0.9
≈ 1667 W.
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9. What is a whip check?
Answers
Answer:
¿Cuál es el efecto látigo?
Es un grave desajuste entre la demanda real de un producto y la demanda de los actores intermediarios en la cadena de suministro
Explanation: espero que te yueda
An electric motor and electric generator are
1. in a way, similar devices with input and output roles
exchanged or reversed.
2, entirely different devices.
3. neither of these
4. not sure
Answers
An electric motor and electric generator are in a way, similar devices with input and output roles are exchanged or reversed.
An electric motor and an electric generator are similar devices in the sense that they both involve the conversion of electrical energy into mechanical energy and vice versa. The key difference lies in the direction of energy conversion.
In an electric motor, electrical energy is supplied as an input, which is then converted into mechanical energy to produce rotational motion. The input is typically provided through an electrical power source, and the output is the mechanical work performed by the motor.
On the other hand, an electric generator operates in a reverse manner. Mechanical energy is supplied as input by rotating the generator's shaft, and this mechanical energy is converted into electrical energy. The output of an electric generator is an electrical current or voltage that can be used to power electrical devices.
So, while the input and output roles are reversed between an electric motor and an electric generator, they share similar principles of energy conversion.
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FILL THE BLANK. a dc ___ motor should always be connected directly to the load and not through belts, chains, etc.
Answers
A DC series motor should always be connected directly to the load and not through belts, chains, etc.
In a DC series motor, the armature and field windings are connected in series. These motors are known for their high starting torque and are commonly used in applications that require high power and speed control, such as in electric vehicles, locomotives, and industrial machinery.
To ensure optimal performance and efficiency, a DC series motor should be directly connected to the load without any intermediate power transmission mechanisms like belts, chains, or gears. Direct connection eliminates energy losses and reduces the risk of mechanical issues or slippage that could occur with additional components.
By connecting the DC series motor directly to the load, the motor can deliver its full torque and power directly to the application without any power transmission losses or inefficiencies. This ensures maximum performance and control over the driven load.
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if a wlan does not require a user to provide credentials to associate with a wireless ap and access the wlan, what type of authentication is said to be in use?
Answers
If a WLAN does not require a user to provide credentials to associate with a wireless AP and access the WLAN, the type of authentication that is said to be in use is Open Authentication.
In an Open System authentication, the AP is open to all devices, which allows them to join the network without authentication. In this type of system, anyone with a WLAN device can connect to the AP and gain network access without having to provide any credentials or keys.WEP (Wired Equivalent Privacy) is one example of open authentication. This is because it does not require any mutual authentication between the client and the access point (AP). As a result, any device with the correct SSID and channel settings can connect to the network.
The open authentication mechanism has no real security since any device can associate with the access point without authentication. Since there are no credentials being passed back and forth, there is no way to ensure that the device connecting to the network is authorized to do so, and as a result, the network is wide open for any device to connect and potentially access its resources without restriction.
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6–23. the beam supports a uniform dead load of 500 lb>ft and a single live concentrated force of 5 k. determine (a) the maximum negative moment at e, and (b) the maximum positive shear at e. assume the support at d is a pin, a and c are rollers, and b is a pin.
Answers
The maximum negative moment at E is -22500lb-ft
The maximum positive shear at E is 4750lb
Given the following:
Dead load=500
Single concentrated force=5k
Part a
Maximum negative moment at E
To get maximum negative moment at E, place the point load at B:
Moment=(1/2*4.5*18*500)-(1/2*4.5*18*500)-(5000*4.5)
=20250-20250-22500
=-22500lb-ft
Part b
Maximum positive shear at e
To get maximum positive shear at E, place the vertical load either B or right of E:
Shear=(1/2*0.5*18*500)-(1/2*0.5*9*500)+(1/2*0.5*9*500)+(5000*0.5)
=2250-1125+1125+2500
=2250+2500
=4750
Shear at E=4750lb
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Convenience items like liquid egg are a lot more expensive?
True
Or False
Answers
Answer:
True
Explanation:
It's just because of the processing
Tech A says that it is best to use a knife or other type of sharp tool to cut away the insulation when
stripping a wire Tech B says that any issues with wing are more likely to be with the terminals than
with the wires themselves. Who is correct?
Answers
suppose that we toss balls into b bins until some bin contains two balls. each toss is independent, and each ball is equally likely to end up in any bin. what is the expected number of ball tosses?
Answers
This problem can be solved using the concept of the coupon collector's problem, which is a well-known problem in probability theory In this case, we can view each bin as a coupon.
pair of identical coupons (balls in the same bin). The expected number of ball tosses can be determined by calculating the expected number of tosses needed to collect each unique coupon and then summing them up Let's assume there are b bins. The probability that a new ball falls into a bin that is different from the previous ones is (b-1)/b.
Thus, the probability of collecting a new unique coupon in the (n+1)-th toss, given that n unique coupons have already been collected, is (b-n)/b Therefore, the expected number of tosses needed to collect a new unique coupon after having already collected n unique coupons is 1/((b-n)/b) = b/(b-n).
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Write a reflection on how you can use your knowledge of thermodynamics during this pandemic period of the Coronavirus to
help yourself, your family, the environment, and society
consider or reconsider your energy usage, needs, and conservation
Answers
Answer:
Plzzzz answer fast......
If a transformer is operated at rated frequency but voltage higher then the rated value, how do you expect the following quantities to change:-
A) No-load current.
B) Hysterics loss.
C) Eddy current loss.
Answers
Does a song need separate mix and mastering engineers?.
Answers
what is simple harmonic motion
Answers
Answer:
Mechanics and physics
Explanation:
Simple harmonic motion is a type of periodic motion
where the restoring force on the moving object is
directly propotional to the magnitude of the objects
displacement and acts towards equilibrium poistion