How many half-lives have elapsed if sample analysis yields 10,000 atoms of the parent isotope and 70,000 atoms of the daughter product?
a) 1 b) 2 c) 3 d) 4 e) 5
Answers
The number of half-lives have elapsed if sample analysis yields 10,000 atoms of the parent isotope and 70,000 atoms of the daughter product is d) 4.
To understand why, we need to first understand the concept of half-lives in radioactive decay.
Radioactive decay occurs when the nucleus of an unstable atom (the parent isotope) spontaneously breaks down, emitting particles or energy in the process. As a result, the parent isotope gradually transforms into a more stable form (the daughter product).
The rate at which this transformation occurs is measured in half-lives. A half-life is the amount of time it takes for half of the parent isotope to decay into the daughter product. For example, if a sample has a half-life of 10 years, after 10 years, half of the parent isotope will have decayed, and after 20 years, three-quarters of the parent isotope will have decayed, and so on.
Now, let's apply this concept to the problem at hand. We know that the sample analysis yields 10,000 atoms of the parent isotope and 70,000 atoms of the daughter product. This means that at some point in the past, the sample started with 20,000 atoms (10,000 parent and 10,000 daughter, since they are both produced at the same rate).
As time passed and the parent isotope decayed, the number of parent atoms decreased while the number of daughter atoms increased. When the sample analysis was done, there were 10,000 parent atoms and 70,000 daughter atoms, which means that 10,000 parent atoms had decayed into 70,000 daughter atoms.
To find out how many half-lives have elapsed, we can use the fact that each half-life reduces the number of parent atoms by half. We can start with the original number of parent atoms (10,000) and divide by 2 repeatedly until we get to the final number of parent atoms (10,000).
10,000 ÷ 2 = 5,000 (1 half-life)
5,000 ÷ 2 = 2,500 (2 half-lives)
2,500 ÷ 2 = 1,250 (3 half-lives)
1,250 ÷ 2 = 625 (4 half-lives)
So it took 4 half-lives for the original 10,000 parent atoms to decay into 10,000. Therefore, the correct answer is d) 4.
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To determine how many half-lives have elapsed if sample analysis yields 10,000 atoms of the parent isotope and 70,000 atoms of the daughter product, follow these steps:
1. Calculate the total number of atoms (parent + daughter): 10,000 + 70,000 = 80,000 atoms.
2. Determine the initial percentage of parent atoms: 10,000 / 80,000 = 0.125 or 12.5%.
3. Use the half-life formula to find the number of half-lives elapsed: (1/2)^n = 0.125, where n is the number of half-lives.
4. Solve for n: n = log(0.125) / log(0.5) = 3.
Therefore, 3 half-lives have elapsed (option c).
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Related Questions
A venturimeter of 400 mm × 200 mm is provided in a vertical pipeline carrying oil of specific gravity 0.82, flow being upward. The difference in elevation of the throat section and entrance section of the venturimeter is 300 mm. The differential U-tube mercury manometer shows a gauge deflection of 300 mm. Calculate: (i) The discharge of oil, and (ii) The pressure difference between the entrance section and the throat section.Take the coefficient of meter as 0.98 and specific gravity of mercury as 13.6
Answers
Answer:
the rate of flow = 29.28 ×10⁻³ m³/s or 0.029 m³/s
Explanation:
Given:
Diameter of the pipe = 100mm = 0.1m
Contraction ratio = 0.5
thus, diameter at the throat of venturimeter = 0.5×0.1m = 0.05m
The formula for discharge through a venturimeter is given as:
Where,
is the coefficient of discharge = 0.97 (given)
A₁ = Area of the pipe
A₁ =
A₂ = Area at the throat
A₂ =
g = acceleration due to gravity = 9.8m/s²
Now,
The gauge pressure at throat = Absolute pressure - The atmospheric pressure
⇒The gauge pressure at throat = 2 - 10.3 = -8.3 m (Atmosphric pressure = 10.3 m of water)
Thus, the pressure difference at the throat and the pipe = 3- (-8.3) = 11.3m
Substituting the values in the discharge formula we get
or
or
Q = 29.28 ×10⁻³ m³/s
Hence, the rate of flow = 29.28 ×10⁻³ m³/s or 0.029 m³/s
Hope This Helps :D
Dirty headlights can reduce visibility up to 90%. True or False
Answers
When the windshield wipers are in operation, North Carolina law mandates the usage of Dirty headlights. 90% less sight is possible when headlights are dirty. When driving through snow, using cruise control can help.
Can headlight haze cut visibility by up to 90%?90% less sight is possible when headlights are dirty. 3. When driving in the snow, cruise control can aid with control.
How much can dim headlights affect visibility?The light decrease caused by headlamp dirt was found to typically be between 10% and 20%, even in dry weather on seemingly clear roadways. Few automobiles have light reductions below 50% on slushy (bed) roads.
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Examine the pressure-measuring device shown in the figure below. (a) What is the gauge pressure reading in psi at point A? (b) What is the pressure difference between point A and B? (c) Which is higher, pressure at point A or at point B? (d) What is the absolute pressure in psi at point D? State any assumptions you made
Answers
Answer: 45
Explanation:just cuase I need to
In a voltage-divider biased pnp transistor, there is no base current, but the base voltage is approximately correct. The most likely problem(s) is
Answers
Answer:
the base-emitter junction is open and the emitter resistor is open
Explanation:
Because here there will be no base current only when the the base emitter junction is kept open and. Also when emitter resistor is kept open or with thus there will be no voltage drop across the Resistor meaning the base voltage Will be equal to that in the voltage divider circuitry
The flow rate f in m3/s of water through a particular pipe, as a function of the pressure drop p across the ends of the pipe (in N/m2) is given by Obtain a linear model of f as a function of p that always underestimates the flow rate over the range 0 ≤ p ≤ 900.
Answers
The equation of the line that always underestimates the flow rate over the range 0 ≤ p ≤ 900 is f = 0.002(p - 900).
The given relationship between flow rate and pressure drop is linear: f = 0.002p. To obtain a linear model that always underestimates the flow rate over the range 0 ≤ p ≤ 900, we need to find a linear function that lies below this line and intersects it at p = 0 and p = 900. This can be done by finding the equation of a line with a steeper slope that passes through the point (0,0) and intersects the original line at p = 900.
Let's find the equation of this line using the point-slope form:
f - 0 = m(p - 0)
where m is the slope of the line. Since the line passes through the point (900, 0.002(900)) = (900, 1.8), we can substitute these values into the equation:
0.002(900) - 0 = m(900 - 0)
1.8 = 900m
m = 0.002
Therefore, the equation of the line that always underestimates the flow rate over the range 0 ≤ p ≤ 900 is:
f = 0.002p - 0.002(900)
Simplifying, we get:
f = 0.002(p - 900)
This linear model has a steeper slope than the original line and intersects it at p = 900, ensuring that it always underestimates the flow rate over the range 0 ≤ p ≤ 900.
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Identify the following example as a fragment or a run-on. Then, rewrite the sentence(s), correcting the error.
John and Mary just broke up so you will not be seeing them together this afternoon.
Answers
What is the basic requirement of measurements?
Answers
The basic requirement of measurements is to have a standard or reference point against which to compare the quantity being measured. This standard or reference point should be well-defined and stable, and the measurement process should be repeatable and consistent. Additionally, it is important to ensure that the measurement equipment is calibrated and in good working condition.
Answer:
The most basic requirement for measurements is the presence of a standard or reference point against which the quantity being measured can be compared. The measurement process should be repeatable and consistent, and the standard or reference point should be well-defined and stable. Furthermore, ensure that the measurement equipment is calibrated and in good working order.
Explanation:
The internal loadings at a critical section along the steel drive shaft of a ship are calculated to be a torque of 2300 lb⋅ft, a bending moment of 1500 lb⋅ft, and an axial thrust of 2500 lb. If the yield points for tension and shear are σY= 100 ksi and τY = 50 ksi, respectively, determine the required diameter of the shaft using the maximum-shear-stress theory
Answers
Answer:
Explanation:
Given that:
Torque T = 2300 lb - ft
Bending moment M = 1500 lb - ft
axial thrust P = 2500 lb
yield points for tension σY= 100 ksi
yield points for shear τY = 50 ksi
Using maximum-shear-stress theory
\(\sigma_A = \dfrac{P}{A}+\dfrac{Mc}{I}\)
where;
\(A = \pi c^2\)
\(I = \dfrac{\pi}{4}c^4\)
\(\sigma_A = \dfrac{P}{\pi c^2}+\dfrac{Mc}{ \dfrac{\pi}{4}c^4}\)
\(\sigma_A = \dfrac{2500}{\pi c^2}+\dfrac{1500*12c}{ \dfrac{\pi}{4}c^4}\)
\(\sigma_A = \dfrac{2500}{\pi c^2}+\dfrac{72000c}{\pi c^3}}\)
\(\tau_A = \dfrac{T_c}{\tau}\)
where;
\(\tau = \dfrac{\pi c^4}{2}\)
\(\tau_A = \dfrac{T_c}{\dfrac{\pi c^4}{2}}\)
\(\tau_A = \dfrac{2300*12 c}{\dfrac{\pi c^4}{2}}\)
\(\tau_A = \dfrac{55200 }{\pi c^3}}\)
\(\sigma_{1,2} = \dfrac{\sigma_x+\sigma_y}{2} \pm \sqrt{\dfrac{(\sigma_x - \sigma_y)^2}{2}+ \tau_y^2}\)
\(\sigma_{1,2} = \dfrac{2500+72000}{2 \pi c ^3} \pm \sqrt{\dfrac{(2500 +72000)^2}{2 \pi c^3}+ \dfrac{55200}{\pi c^3}} \ \ \ \ \ ------(1)\)
Let say :
\(|\sigma_1 - \sigma_2| = \sigma_y\)
Then :
\(2\sqrt{( \dfrac{2500c + 72000}{2 \pi c^3})^2+ ( \dfrac{55200}{\pi c^3})^2 } = 100(10^3)\)
\((2500 c + 72000)^2 +(110400)^2 = 10000*10^6 \pi^2 c^6\)
\(6.25c^2 + 360c+ 17372.16-10,000\ \pi^2 c^6 =0\)
According to trial and error;
c = 0.75057 in
Replacing c into equation (1)
\(\sigma_{1,2} = \dfrac{2500+72000}{2 \pi (0.75057) ^3} \pm \sqrt{\dfrac{(2500 +72000)^2}{2 \pi (0.75057)^3}+ \dfrac{55200}{\pi (0.75057)^3}}\)
\(\sigma_{1,2} = \dfrac{2500+72000}{2 \pi (0.75057) ^3} + \sqrt{\dfrac{(2500 +72000)^2}{2 \pi (0.75057)^3}+ \dfrac{55200}{\pi (0.75057)^3}} \ \ \ OR \\ \\ \\ \sigma_{1,2} = \dfrac{2500+72000}{2 \pi (0.75057) ^3} - \sqrt{\dfrac{(2500 +72000)^2}{2 \pi (0.75057)^3}+ \dfrac{55200}{\pi (0.75057)^3}}\)
\(\sigma _1 = 22193 \ Psi\)
\(\sigma_2 = -77807 \ Psi\)
The required diameter d = 2c
d = 1.50 in or 0.125 ft
to cool a given room it is necessary to supply 4 ft3 /s of air through an 8-in.-diameter pipe. approximately how long is the entrance length in this pipe?
Answers
To cool a given room it is necessary to provide 4 ft³/s of air through an 8-inches diameter pipe, for this Entrance length in this pipe = 17.7 ft
Q = 4ft³/s
Diameter = D = 8 inches
Entrance length in this pipe = \(l_{e}\) = ?
By using flow rate formula:
V = Q/A
V= Q/ π/4*D²
= 4ft³/s / π/4 (8/12 ft)²
V= 11.5 ft/s
Thus, with ν = 1.57 x 10⁻⁴ft²/s (value from table)
Re = VD/ν
Re = 11.5 ft/s (8/12 ft)/1.57x10⁻⁴ft²/s
Re = 48,800 > 4000 (based on the criteria)
so, the flow is turbulent
Hence,
\(l_{e} / D\) = \(4.4 R_{e}^{1/6}\)
\(l_{e}\) = 4.4 (48,800)\(^{1/6}\) (8/12)
\(l_{e}\) = 17.7 ft
Entrance Length of an 8-inch diameter pipe = 17.7 ft
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when working around underground power equipment such as backhoe and trenchers you should always stand back at least _____ when the equipment is operating
Answers
When working around underground power equipment such as backhoe and trenchers you should always stand back at least 10 feet when the equipment is operating.
This distance is important to maintain safety, as the equipment can be dangerous and unpredictable. Standing too close can put you at risk of injury or even death. Additionally, it is important to wear appropriate personal protective equipment, such as hard hats, safety glasses, and steel-toed boots, when working around such equipment.
A backhoe is a heavy piece of equipment that consists of a tractor with a shovel/bucket attached to the front and a digging bucket at the back, which is typically used for excavation work. The backhoe is suitable for digging ditches, foundations, and other infrastructure jobs. A trencher is an equipment used to dig trenches in the ground, generally for laying cables or pipelines, or to excavate archaeological sites (since they would avoid leaving large piles of dirt in the middle of the landscape). Trenchers can be quite hazardous if they are not used correctly.
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2. a wheel tractor-scraper is operating on a level grade. assume no power derating is required for equipment condition, altitude, and temperature. use equipment data from figure 6.10. a) disregarding traction limitations, what is the maximum value of rolling resistance (in lb/ton) over which the fully loaded unit can maintain a speed of 15 mph? b) what minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to satisfy the requirements of part a? for the fully loaded condition, 52% of the weight is distributed to the drive axle. the operating weight of the empty scraper is 74,946 lb.
Answers
We can see here that the maximum value of rolling resistance over which a loaded scraper can maintain is: 780 lb/ton
What is a maximum rolling resistance?Rolling resistance is the force that resists the motion of a rolling object on a surface. Maximum rolling resistance refers to the highest level of resistance that an object can encounter while rolling on a particular surface.
For a fully loaded condition:
15mph speed, 52% resistanceGrade resistance = 0%The total resistance = (gross + rolling) resistance
52% = 0% - rolling resistance
rolling resistance = 52%
The maximum rolling resistance = rolling resistance percentage × speed
The maximum rolling resistance = 52% (15 lb/ton)/(1% resistance)
The maximum rolling resistance = 780 lb/ton
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1. It's very kind _______ you to help us. Thanks a lot. A. for B. to C. with D. of
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Hope this helps☺️
A construction manager is looking for workers to build a series of walkways within a large garden apartment project. What type of
workmen should the manager employ?
Answers
Answer:
Casual workers
Explanation:
Casual workers are workers on a short-term employment contract that unlike non-permanent workers have restricted entitlement to benefits, little employment security, with the primary distinction of there being a lack of a stable connection or relationship between them and their employers for the to be referred to as employees.
In what way is a parallel circuit different from a series circuit?
Answers
A mechanic's lien would be properly classified as a(n):
A. Equitable lien
B. Involuntary lien
C. General lien
D. Unstatutory lien
Answers
Consequently, the correct answer is B. Involuntary lien.
A mechanic's lien would be properly classified as a(n) involuntary lien.
What is a mechanic's lien?
A mechanic's lien is a type of legal claim granted to builders, contractors, and other professionals who provide labor or supplies for the construction or improvement of buildings and structures on behalf of the property owner.
The mechanic's lien is the professional's right to sue the owner of the building or land for non-payment if they have delivered materials or services to the property but have not been paid.
In the context of real estate law, a mechanic's lien is an involuntary lien, which means that the lien is imposed on the owner's property by operation of law and without the owner's consent. This sort of lien is known as a general lien.Involuntary liens are imposed on a property by law or without the property owner's consent, such as taxes, judgments, or mechanic's liens. In contrast to voluntary liens, which are agreements made between the owner and the creditor, involuntary liens are imposed by law without the owner's consent
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which tool would be practical to use to make an opening that is large enough for a firefighter to pass through in a brick or concrete block wall?
Answers
For brick and mortar tasks, particularly those that call for deeper cuts, a hammer drill is excellent. The tool moves like a hammer as it drills holes. Particularly designed hammer drills are used to make holes in masonry.
What do you call a small opening that makes it easier to use tools and force entry?Define "bite" as it is used in the Halligan context. a little gap that facilitates easier tool access during forced entrance. - The Halligan bar can be set in place by a firefighter using a flat-head axe, which will improve the bite. Pry, Hux, and Crowbars should be used properly.
What tool is used to create a hole in a wall?Drills can make a variety of holes in a wide range of materials and come in a wide variety of sizes and forms. To be able to making holes Typically, drill bits are connected to a drill, which rotates them to cut through the workpiece.
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Which company produces comprehensive patch management software?
Quest
Motorola
Apple
Sony
Answers
What braking system would be the most unsafe for a car going over 200mph?
Answers
Answer:
Deactivated Anti-Lock Braking System
Explanation:
Well this actually depends on the vehicles braking function
I'd say in this case not sure if ABS coz it prevents the vehicle from slipping while braking...
On the otherside ESP is inportant for it stability
The monthly output of a certain product is Q(x)=2500x 5/2
where x is the capital investment in millions of dollars. Find dQ/dx, which can be used to estimate the effect on the output if an additional capital investment of $1 million is made. dQ/dx=
Answers
The monthly output of a certain product can be given by the function
\(`Q(x) = 2500x^(5/2)`\)
where x is the capital investment in millions of dollars.
differentiate the function Q(x) with respect to x.
\(dQ/dx = d/dx(2500x^(5/2))\)
Using the power rule of differentiation, we have:
\(dQ/dx = (5/2) * 2500 * x^(5/2 - 1)dQ/dx
= 6250x^(3/2) `dQ/dx
= 6250x^(3/2)`\)
which gives us the effect on the output if an additional capital investment of $1 million is made.
Note: To estimate the effect on the output if an additional capital investment of $1 million is made, we substitute x with x+1 in the expression for `dQ/dx`. This gives us the new output and the increase in output due to the additional investment.
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Air initially at 120 psia and 500o F is expanded by an adiabatic turbine to 15 psia and 200o F. Assuming air can be treated as an ideal gas and has variable specific heat. a) Determine the specific work output of the actual turbine (Btu/lbm). b) Determine the amount of specific entropy generation during the irreversible process (Btu/lbm R). c) Determine the isentropic efficiency of this turbine (%).
Answers
Answer:
a) specific work output of the actual turbine is 73.14 Btu/lbm
b) the amount of specific entropy generation during the irreversible process is 0.050416 Btu/lbm°R
c) Isentropic efficiency of the turbine is 70.76%
Explanation:
Given the data in the question;
For an adiabatic turbine; heat loss Q = 0
For Initial State;
p₁ = 120 psia
T₁ = 500°F = 959.67°R
from table; { Gas Properties of Air }
At T₁ = 959.67°R
\(s_1^0\) = 0.74102 Btu/lbm°R
\(h_1\) = 230.98 Btu/lbm
For Finial state;
p₂ = 15 psia
T₂ = 200°F = 659.67°R
\(s^0_{2a\) = 0.64889 Btu/lbm°R
\(h_{2a\) = 157.84 Btu/lbm
we know that R for air is 0.06855 Btu/lbm.R
a)
The specific work output of the actual turbine Wₐ is;
W\(_a\) = \(h_1\) - \(h_{2a\)
we substitute
W\(_a\) = 230.98 - 157.84
W\(_a\) = 73.14 Btu/lbm
Therefore, specific work output of the actual turbine is 73.14 Btu/lbm
b)
amount of specific entropy generation during the irreversible process.
To determine the entropy generation \(S_{gen\);
\(S_{gen\) = ΔS = \(s_{2a\) - \(s_1\) = \(s^0_{2a\) - \(s_1^0\) - R ln(\(\frac{p_2}{p_1}\))
we substitute in our values
\(S_{gen\) = 0.64889 - 0.74102 - 0.06855 ln(\(\frac{15}{120}\))
\(S_{gen\) = 0.64889 - 0.74102 + 0.1425457
\(S_{gen\) = 0.050416 Btu/lbm°R
Therefore, the amount of specific entropy generation during the irreversible process is 0.050416 Btu/lbm°R
c)
Isentropic efficiency of turbine η\(_{is\)
η\(_{is\) = {actual work output] / [ ideal work output ] = (\(h_1\) - \(h_{2a\) ) / ( \(h_1\) - \(h_{2s\) )
Now, for an ideal turbine;
ΔS = 0 = \(s_{2s\) - \(s_1\)
so, \(s_{2s\) - s₁ = \(s^0_{2s\) - \(s_1^0\) - R ln(\(\frac{p_2}{p_1}\))
0 = \(s^0_{2s\) - \(s_1^0\) - R ln(\(\frac{p_2}{p_1}\))
\(s^0_{2s\) = \(s_1^0\) + R ln(\(\frac{p_2}{p_1}\))
we substitute
\(s^0_{2s\) = 0.74102 + 0.06855 ln(\(\frac{15}{120}\))
\(s^0_{2s\) = 0.74102 - 0.1425457
\(s^0_{2s\) = 0.59847 Btu/lbm°R
Now, from table; { Gas Properties of Air }
At \(s^0_{2s\) = 0.59847 Btu/lbm°R; \(h_{2s\) = 127.614 Btu/lbm
η\(_{is\) = [( \(h_1\) - \(h_{2a\) ) / ( \(h_1\) - \(h_{2s\) )] × 100%
we substitute
η\(_{is\) = [( 230.98 - 157.84 ) / ( 230.98 - 127.614 )] × 100%
η\(_{is\) = [ 73.14 / 103.366] × 100%
η\(_{is\) = 0.70758 × 100%
η\(_{is\) = 70.76%
Therefore, Isentropic efficiency of the turbine is 70.76%
Steam enters an adiabatic nozzle at 1 MPa, 250°C, and 30 m/s. At one point in the nozzle the enthalpy dropped 40 kJ/kg from its inlet value. Determine velocity at that point. (A) 31 m/s (B) 110 m/s (C) 250 m/s (D) 280 m/s
Answers
Answer:
284.4 m/s
Explanation:
At the inlet of the nozzle P =1 atm.
Temperature T = 250° C
Velocity of the steam at the inlet V_1 = 30 m/s
Change in enthalpy Δh = 40 KJ/kg
let V_2 be the final velocity
then
\(V_2 =\sqrt{2\Delta h+V_1^2} \\=\sqrt{2\times40+30^2}\\= 284.4 m/s\)
Ratio equivalent to 12 red beans to 5 total beans
Answers
Hello!
The answer to this question as a percentage is 240%
Answer:
n
Explanation:
"When people in the United states call a helpline or make an airline reservation,they may be connected to someone in Mumbai(bombay), India who has been trained to speak English with an American accent." This statement refers to the important aspects of globalization. Can you discuss the reasons why operations managers would consider such an aspect
Answers
The reason that operations managers consider these aspects is because they want to provide quality service to the users of the telephone line.
What is globalization?Globalization is a term that refers to an economic, technological, political, social and cultural process that has had influence throughout the world. Globalization is based on the growing communication and interdependence between the different countries of the world, uniting their markets and societies.
How is this situation related to globalization?This situation is related to globalization because it shows that companies can hire employees anywhere in the world because technology allows a person from India to communicate with someone from the United States without any difficulty.
Additionally, it is part of globalization because employees are trained so that their English accent is similar to that of the United States so that users of the line do not detect that they are from another country and feel more confident to book their tickets.
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Use of a transfer test evaluates this performance characteristic associated with motor skill learning:A. AdaptabilityB. ConsistencyC. ImprovementD Persistence
Answers
Utilizing a transfer test examines this performance trait connected to the acquisition of motor skills, adaptability.
What is meant by motor skill learning?The process of motor learning is acquiring a skill, then performing it repeatedly while keeping an end in mind (Schmidt & Wrisberg 2007). For instance, it takes a lot of practice and effort to learn to play a song on the piano until the action becomes instinctive and skillfully performed.
As a result, the development of motor abilities may trigger a chain reaction that affects areas unrelated to motor behavior, such as perception and cognition, language and communication, emotional expression and control, physical development and health, etc. Finally, the development of motor skills makes conduct more adaptable and useful.
Therefore, the correct answer is option A. Adaptability.
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The Reynolds number, pVD/u is a very important parameter in fluid mechanics. Determine its
value for ethyl alcohol flowing at a velocity of 2 m/s through a 5-in.-diameter pipe.
PVD/u =
Answers
The Reynolds number is a dimensionless parameter used in fluid mechanics to predict flow patterns in different fluids. It can be calculated using the formula pVD/u.
What is the Reynolds number and how can it be calculated?The Reynolds number, represented by Re, is a dimensionless number used to predict the flow behavior of fluids. It is determined by the ratio of the inertial forces to the viscous forces in a fluid.
The equation for Reynolds number is Re = pVD/u, where p is the density of the fluid, V is the velocity of the fluid, D is the diameter of the pipe, and u is the dynamic viscosity of the fluid.
Given the flow velocity of 2 m/s and pipe diameter of 5 inches (0.127 m), we need to find the dynamic viscosity of ethyl alcohol and density to calculate the Reynolds number. At 20°C, the dynamic viscosity of ethyl alcohol is 1.2 x 10⁻³ Pa·s and the density is 789 kg/m³.
Therefore, the Reynolds number for ethyl alcohol flowing at 2 m/s through a 5-inch diameter pipe is:
Re = (789 kg/m³) x (2 m/s) x (0.127 m) / (1.2 x 10⁻³Pa·s) = 1.05 x 10⁶
So, the Reynolds number for this flow is relatively high, indicating that the flow will be turbulent.
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Question 3 a data analyst is working on a dataset and begins the transform data phase of analysis. what are some of the actions that they will take? select all that apply.
Answers
A data analyst working on a dataset when begins the transform data phase of analysis will be taking these two actions: one is finding the correlation between data and the other is performing calculations on data. Therefore, options (c) and (d) hold the correct answers.
Data analysis refers to the technique of examing data sets in order to discover trends and build conclusions about the information the data sets contain. The transform phase is a phase data of analysis where a data analyst identifies patterns and relationships between different data sets. For doing so, the data analyst finds correlations between several data sets and performs calculations on them as well.
"
Here is the complete question
A data analyst is working on a dataset and begins the transform data phase of analysis. what are some of the actions that they will take? select all that apply.
a) Filtering data
b) Sorting data
c) Finding a correlation in data
d) Performing a calculaiton with data
"
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How would you handle a situation where another team member was critical of your work?
Answers
How are deltas formed?
erosion of softer rock
connection of channels
deposition from flow into a lake or an ocean
creation of large, flat areas by flooding deposits
Answers
Answer:
It is created from deposition from flow into a lake or an ocean like the Missisippi delta
Explanation:
Answer:
C: deposition from flow into a lake or an ocean
Explanation:
deposition from rivers creates a variety of features, delta deposits created by flow into lake or ocean, is one of them.
A glass plate is subjected to a tensile stress of 40 MPa. If the specific surface energy is 0.3 J/m2 and the modulus of elasticity is 69 GPa, determine the maximum length of a surface flaw that is possible without fracture.
Answers
Answer:
8.24μm
Explanation:
The theory of brittle fracture was used to solve this problem.
And if you follow through with the attachment made a the subject of the formula
Such that,
a = 2x(69x10⁹)x0.3/pi(40x10⁶)²
= 4.14x10¹⁰/5.024x10¹⁵
= 8.24x10^-06
= 8.24μm
This is the the maximum length of the surface flaw
Oxidation Inhibitors are antioxidant additives that slow the degradation
of the oil stock by oxidation?
Answers
Answer: True
Explanation:
Oil oxidation is a process that all oil goes through and involves a series of chemical reactions between compounds in the oil and oxygen that lead to the quality of the oxygen falling. In other words, oxidation degrades oil.
Even though this is a process that all oil goes through and one that cannot be stopped, it's pace can be reduced. One way of doing this is by adding oxidation inhibitors which are antioxidant additives that work to slow the degradation of the oil stock by oxidation.