if the drag on one side of a flat plate parallel to the upstream flow is d when the upstream velocity is u, what will the drag be when the upstream velocity is (a) 8u, (b) u/8? assume laminar flow.
Answers
The drag force on the flat plate, when the upstream velocity is 8u, will be 32 times the drag force when the upstream velocity is u. The drag force on the flat plate, when the upstream velocity is u/8, will be 1/128 times the drag force when the upstream velocity is u.
(a) When the upstream velocity is 8u, the drag force on the flat plate can be calculated as follows:
D' = Cd * (ρ * A * (8u)² / 2)
= Cd * (ρ * A * 64u² / 2)
= 32 * Cd * (ρ * A * u²)
(b) When the upstream velocity is u/8, the drag force on the flat plate can be calculated as follows:
D' = Cd * (ρ * A * (u/8)² / 2)
= Cd * (ρ * A * u² / 128)
= 1/128 * Cd * (ρ * A * u²)
Velocity is a fundamental concept in physics that refers to the rate at which an object changes its position over time. More specifically, it is a vector quantity that includes both the speed and direction of an object's motion. In mathematical terms, velocity is defined as the change in position of an object divided by the time it takes for that change to occur.
Velocity is often confused with speed, but the two are not interchangeable. While speed only measures how fast an object is moving, velocity takes into account the direction of that motion as well. For example, if a car is traveling at 60 miles per hour to the north, its velocity would be 60 miles per hour to the north.
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Related Questions
Water is heated by hot air in a double-pipe heat exchanger L = 10 m, with water flowing in the inner tube (Di = 3 cm), and air flowing in the tube annulus (Do = 5.5 cm). The flow rate of the water is 1.2 kg/s and that of the air is 0.5 kg/s. The water enters at 40°C while the air enters at 280°C. If the air-side convection coefficient hair = 1000 W/m2·K, determine the following:
(a) The outlet temperatures of both the air and the water if the heat exchanger is operating in a parallel-flow arrangement.
(b) The outlet temperatures of both the air and the water if the heat exchanger is operating in a counter-flow arrangement.
Assume fully-developed flow conditions. Evaluate the fluid properties at the inlet temperatures.
Answers
(a) In a parallel-flow arrangement, the outlet temperature of the water and the air can be determined using the energy balance equation. The heat transfer rate between the water and the air is equal to the product of the water mass flow rate, specific heat capacity of water, and the change in temperature of the water:
Similarly, the heat transfer rate between the air and the water is equal to the product of the air mass flow rate, specific heat capacity of air, and the change in temperature of the air:
Since the heat exchanger is operating under fully-developed flow conditions, the outlet temperature of the water and the air can be found by equating the heat transfer rates:
By substituting the given values, including the specific heat capacities of water and air, and solving the equations, the outlet temperatures of the air and water can be calculated.
(b) In a counter-flow arrangement, the outlet temperatures of the air and water can be determined using a similar energy balance equation. However, in this case, the change in temperature of the air is taken as the difference between the outlet and inlet temperatures of the air:
Again, by equating the heat transfer rates, substituting the given values, and solving the equations, the outlet temperatures of the air and water in a counter-flow arrangement can be calculated.
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What type of cells don't have cell walls.
Answers
Answer:
Animal Cells
Explanation:
they dont have cell walls because they dont need them. Wall cells are found in plants, which animals dont need.
Answer:
predominantly
Explanation:
they don't have cell walls
. An astronomer needs to measure the distance to a globular cluster of stars that is part of the Milky Way Galaxy. What method should she try to use to find the distance?
Answers
The method the astronomer needs to find the distance is the hubble law.
The hubble law states that galaxies are moving away from at earth at speeds proportional to their distance.
The hubble law is expressed mathematically as v = H₀d where v = recessional speed, H₀ = Hubble constant and d = distance of galaxy from earth.
The recessional speed of the galaxy is found from the redshift of the light emitted from the galaxy.
Since we are dealing with a globular cluster of stars, the recessional speed is found from the redshift of the light emitted from the globular cluster of stars.
If we determine the recessional speed, we can then determine the distance of the globular cluster of stars by making the distance subject of the formula in the equation.
So, d = v/H₀
So, the method the astronomer needs to find the distance is the hubble law.
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Which characteristics can be used to differentiate star systems? Select three options.
the number of stars in the system
O the level of dust and gas
the age of the stars in the system
the way stars are organized in the system
the color of stars in the system
Answers
Answer:
1,3and4 just did and got correct
Explanation:
Which is a primary energy source used by power plants to generate electricity
A:wind power
B:solar
C:coal
D:hydropower
Answers
Answer:
it would be coal
Explanation:
coal is the most used energy source in many countries as of China , India and, the United States
Coal is a primary energy source used by power plants to generate electricity
Electricity generation plants convert the chemical energy of fuel into electricity. Coal, oil, natural gas and nuclear fuels are the energy sources most commonly used for generating electricity.
What is coal ?"Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests."
What is electricity?"A fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons. "
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When a car of mass 1000kg is travelling along a level road at a steady speed of 20ms −1
its engine is working at 18kW.
Resultant force = 900N Braking Force = 3100N Gravity = 9.81
By how much does this change if the car is travelling down the same hill at 20ms −1 ?
Answers
Answer:
OK draw a diagram - you have the force from (b) acting sown the slope and a component of the weight. Use F=ma to get the deceleration and then use SUVAT. Post your working if this doesn't work.
friction = 900N
braking = 3100N
total = 4000N
w= mxg = 1000*9.81= 9810N
total = 9810 + 4000 = 13810N
force/mass = 13810/1000 = 13.81ms^-2
then using v^2 = u^2 + 2as, i get s as 14 but it is incorrect
Explanation:
arrange 6.002, 6.023, 6.302, 6.020 from least to greatest
WILL MARK BRAINLIEST
Answers
Answer:
6.002
6.020
6.023
6.302
Explanation:
What is the name of the relationship between period and frequency?
Answers
Answer:
Periodic motion is a repetitious oscillation.
Explanation:
The time for one oscillation is the period T. The number of oscillations per unit time is the frequency f. These quantities are related by f=1T f = 1 T .
GIVE ME THE ANSWERS TO MY SCIENCE PROJECT PLS!
Directions
Now that the lab is complete, it is time to write your lab report. The purpose of this guide is to help you write a clear and concise report that summarizes the lab you have just completed.
The lab report is composed of two sections:
Section I: Overview of Investigation
Provide background information.
Summarize the procedure.
Section II: Observations and Conclusions
Include any charts, tables, or drawings required by your teacher.
Include answers to follow-up questions.
Explain how the investigation could be improved.
To help you write your lab report, you will first answer the four questions listed below based on the lab that you have just completed. Then you will use the answers to these questions to write the lab report that you will turn in to your teacher.
You can upload your completed report with the upload tool in formats such as OpenOffice.org, Microsoft Word, or PDF. Alternatively, your teacher may ask you to turn in a paper copy of your report or use a web-based writing tool.
Questions
Section I: Overview of Lab
What is the purpose of the lab?
What procedure did you use to complete the lab?
Outline the steps of the procedure in full sentences.
Section II: Observations and Conclusions
What charts, tables, or drawings would clearly show what you have learned in this lab?
Each chart, table, or drawing should have the following items:
An appropriate title
Appropriate labels
If you could repeat the lab and make it better, what would you do differently and why?
There are always ways that labs can be improved. Now that you are a veteran of this lab and have experience with the procedure, offer some advice to the next scientist about what you suggest and why. Your answer should be at least two to three sentences in length.
Writing the Lab Report
Now you will use your answers from the four questions above to write your lab report. Follow the directions below.
Section I: Overview of Lab
Use your answers from questions 1 and 2 (above) as the basis for the first section of your lab report. This section provides your reader with background information about why you conducted this lab and how it was completed. It should be one to two paragraphs in length.
Section II: Observations and Conclusions
Use your answers from questions 3 and 4 (above) as the basis for the second section of your lab report. This section provides your reader with charts, tables, or drawings from the lab. You also need to incorporate your answers to the follow-up questions (from the Student Guide) in your conclusions.
Overall
When complete, the lab report should be read as a coherent whole. Make sure you connect different pieces with relevant transitions. Review for proper grammar, spelling, punctuation, formatting, and other conventions of organization and good writing.
Answers
I can provide guidance on how to structure your lab report based on the questions you have provided.
Section I: Overview of LabThe purpose of this section is to provide background information about the lab and to summarize the procedure used to complete the lab. This section should be one to two paragraphs in length.In the first paragraph, you should briefly state the purpose of the lab. This should include a clear statement of the problem or question that the lab is addressing. For example, "The purpose of this lab was to investigate the effect of temperature on the rate of enzyme activity."
In the second paragraph, you should summarize the procedure used to complete the lab. This should include an overview of the steps taken and any materials or equipment used. The procedure should be outlined in full sentences and provide enough detail for the reader to understand what was done. For example, "To complete the lab, we first collected three test tubes and labeled them A, B, and C. We then added 5 ml of the enzyme solution to each tube and placed them in a water bath at 30°C for 10 minutes."Section II :Observations and ConclusionsThe purpose of this section is to present any charts, tables, or drawings required by your teacher and to include answers to follow-up questions. This section should be organized based on the structure of the questions provided.In the first part of this section, you should include any charts, tables, or drawings that would clearly show what you have learned in the lab. Each chart, table, or drawing should have an appropriate title and appropriate labels.
In the second part of this section, you should answer the follow-up question about how the investigation could be improved. Offer some advice to future scientists about what you suggest and why. Your answer should be at least two to three sentences in length.OverallWhen complete, the lab report should be read as a coherent whole. Make sure you connect different pieces with relevant transitions. Review for proper grammar, spelling, punctuation, formatting, and other conventions of organization and good writing. It is important to be clear and concise in your writing and to use appropriate scientific language and terminology.
Scientific theories are able to be changed true or false
Answers
Answer:
true
Explanation:
Write down any four points that should be considered during household wiring
Answers
2. Person attempting the task has some general knowledge about wiring
3. Not All Cable is Color-Coded
Cable-sheath color coding started in 2001 and is still voluntary. If you have older wiring, don’t assume it complies with the current color coding. However, most manufacturers now follow the standard color code.
4. Stranded wire is more flexible than solid. If you’re pulling wire through conduit, stranded wire makes it easier to get around corners and bends in the conduit. However, if the situation requires pushing wires through conduit, you’ll want to use solid wire.
Answer:
USE RUBBER CLOVES
USE A PLIER
USE CONDUCTIVE WIRES
SWITHC OFF THE MAIN SWITCH WHILE WIRRING
Explanation:
What are some examples of X-Ray waves
Answers
Answer:
X - Rays
Explanation:
Hope it Helps!
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Answer: Black holes, sun, stars, neutron stars
Explanation:
Can a nucleus emit alpha particles that have different energies? Explain.
Answers
Yes, a nucleus can emit alpha particles with different energies. When an alpha particle is emitted, it carries away a certain amount of energy.
The energy of an alpha particle depends on the specific nucleus and the nuclear reaction that occurs. The energy can vary due to the varying energy levels of the nucleons within the nucleus. This means that different alpha particles emitted from the same nucleus can have different energies.
The energy of the emitted alpha particles can be calculated using equations that consider the masses and binding energies of the nucleons involved in the reaction. So, in summary, a nucleus can emit alpha particles with different energies based on the characteristics of the nucleus and the nuclear reaction that takes place.
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do you notice any pattern in the voltages across the light bulbs connected in parallel?
Answers
in a parallel circuit, the voltage across each component is the same, while the current flowing through each component may be different.
in a parallel circuit, the voltage across each light bulb is the same. This is because all the components in a parallel circuit are connected across the same two points (nodes) and therefore experience the same potential difference or voltage.
In contrast, the current flowing through each light bulb in a parallel circuit can be different, as each component has its own current path to and from the power source. The total current flowing through the circuit is divided among the different branches, with the current through each branch depending on its resistance and the voltage across it.
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develop a hypothesis about the relationship between an object's mass and its weight
Answers
Answer:
Mass = Size, Weight = Heaviness
Explanation:
Mass is how much matter that is in an object
Weight is a measurement that indicates how heavy something
A 25 kg air compressor is dragged up a rough incline from r⃗ 1=(1.3ı^+1.3ȷ^)m to r⃗ 2=(8.3ı^+4.1ȷ^)m, where the y-axis is vertical. How much work does gravity do on the compressor during this displacement
Answers
The work done by gravity on the compressor is -686.7 J.
Calculation-We must first calculate the change in the compressor's gravitational potential energy (U) as it is dragged up the incline to calculate the work done by gravity on it. Several factors determine how gravitational potential energy changes:
ΔU = mgh
where m is the compressor's mass, g is its gravitational acceleration, and h is the compressor's change in height.
The compressor's height has changed as follows:
Δh = y2 - y1
where the y-coordinates of the compressor's initial and final positions are represented by y1 and y2, respectively.
y1 = 1.3 m
y2 = 4.1 m
Δh = y2 - y1 = 4.1 m - 1.3 m = 2.8 m
The acceleration due to gravity is g = 9.81 m/s^2.
The mass of the compressor is given as 25 kg.
As a result, the gravitational potential energy has changed as follows:
686.7 J = U = mgh = (25 kg)(9.81 m/s2)(2.8 m).
The work done by gravity is equal in magnitude but opposite in sign to the change in gravitational potential energy since the compressor is being lifted against the pull of gravity. As a result, the following is the work that gravity does on the compressor during this displacement:
W = -ΔU = -686.7 J
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Explain with reason that when sunlight is focused on a piece of paper with the help of a convex len the paper will burn.
Answers
Answer:
Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. ... As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.
Explanation:
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What must you have in order for ferromagnetism to occur?
Answers
Answer:
Its atoms or ions have permanent magnetic moments
Source:
ferromagnetism - BritannicaThe different properties of ferromagnetic materials must have for ferromagnetism.
What are the properties of ferromagnetic materials?Domains of persistent dipole moment exist in the atoms of ferromagnetic materials.Atomic dipoles in ferromagnetic materials are orientated parallel to the magnetic field's direction.The magnetising field's direction is where the strong magnetic dipole moment is located.The field inside the material is significantly stronger than the magnetising field, and relative permeability likewise varies linearly with the magnetising field. They have a propensity to draw several lines of stress into the material.The field produces a strong attraction for ferromagnetic materials. They consequently tend to remain at the poles where the field is strongest in a nonuniform field.Learn more about ferromagnetism here:
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What is the weight, on Earth, of a book with a mans of 1.5 kg?
15N
66N
11 3N
14,7N
Answers
explanation- weight is forced due to gravity
a ________ is a rising and falling disturbance that transports energy from a source to a receiver without the actual transfer of material.
Answers
A wave is a disturbance that moves or travels through a medium such as air, water, or even space without causing any actual transfer of the medium from one point to another. It transfers energy from a source to a receiver, where it can be sensed or detected, but it does not transport any actual material.
A wave can be described by its amplitude, wavelength, frequency, and period. The distance between two consecutive peaks or troughs in a wave is referred to as its wavelength. The time required for one complete wave cycle to occur is referred to as the wave's period. The energy carried by a wave is proportional to its amplitude, which is the distance between the wave's maximum displacement and its equilibrium position. Waves can be classified into two categories: transverse and longitudinal waves.
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A 1020-ft3 tank is lled with dirty water, with 30% of ground in it. Cleaner water, with only 0.5% of ground, is poured into the tank at a constant rate of 10 ft3 per minute. The uniformly mixed solution of water and ground flows out of the tank at the same rate. After how many minutes will the concentration of ground in the tank be 15.25%? Caution: while writing out the formulas, keep in mind whether you are considering the amount of salt in the tank or its concentration
Answers
After approximately 2.95 minutes, the concentration of ground in the tank will be 15.25%.
To solve this problem, we need to consider the amount of ground (salt) in the tank rather than its concentration. Let's break down the problem and solve it step by step:
Initial Conditions:
Volume of the tank:\(1020 ft^3\)
Initial concentration of ground in the dirty water: 30%
Concentration of ground in the cleaner water: 0.5%
Rate of pouring cleaner water: 10 ft^3 per minute
Let's denote the time in minutes as "t". At time t, the following variables will be applicable:
Volume of the dirty water in the tank: (1020 - 10t) ft^3 (due to pouring cleaner water and outflow)
Amount of ground in the dirty water: 0.3 * (1020 - 10t) ft^3 (30% concentration)
As cleaner water is poured into the tank at a rate of 10 ft^3 per minute, the amount of ground in the tank decreases at the same rate. Therefore, the rate of decrease in the amount of ground is 0.5% of 10 ft^3 per minute.
Differential Equation for the amount of ground in the tank:
\(dG/dt = -0.005 * 10\\dG/dt = -0.05 ft^3 \:per \:minute\)
Integrating the differential equation, we get:
\(G(t) = -0.05t + C\)
We can find the constant C using the initial condition:
\(G(0) = 0.3 * 1020 ft^3\) (initial amount of ground in the dirty water)
\(0 = -0.05 * 0 + C\\C = 0.3 * 1020 \:ft^3\)
The equation for the amount of ground in the tank as a function of time becomes:
\(G(t) = -0.05t + 0.3 * 1020 ft^3\)
We want to find the time t at which the concentration of ground in the tank is 15.25%. Since concentration = amount/volume, we can set up the equation:
\(\frac{(0.1525 * (1020 - 10t))}{(1020 - 10t) = G(t) / (1020 - 10t)}\)
Simplifying the equation, we get:
\(0.1525 = -0.05t + 0.3\)
Solving for t, we find:
t = 2.95 minutes
Therefore, after approximately 2.95 minutes, the concentration of ground in the tank will be 15.25%.
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anybody can help me please. thank you!
What is the velocity of a 348 Kg motorcycle that has a momentum of 4,833 kg.m/s?
How much force is needed to stop it in 5 second?
What is its Impulse?
Answers
The velocity of the motorcycle is 13.9 m/s.
The Force required to stop the motorcycle is 966.6 N
The Impulse of the motorcycle is 833 kg.m/s
What is velocity?Velocity is the rate of change of displacement.
To calculate the velocity of the motorcycle, we use the formula below
Formula:
v = M/m.................... Equation 1Where:
v = VelocityM = Momentumm = MassFrom the question,
Given:
M = 4833 kgm/sm = 348 kgSubstitute these values into equation 1
v = 4833/348v = 13.9 m/sTo calculate the force, we use the formula below
F = M/t............. Equation 2Where:
F = Forcet = TimeGiven:
t = 5 secondsSubstitute into equation 2
F = 4833/5F = 966.6 NFinally, to calculate the impulse, we use the formula below
I = FtWhere:
I = ImpulseSubstitute into the equation above
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The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. the 125-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. knowing that kinetic friction results in a couple of magnitude 2.5 lb·ft exerted on the rotor, determine the number of revolutions that the rotor executes before coming to rest. (round the final answer to its nearest whole number.)
Answers
Answer:
θ '= 4975 rev
Explanation:
For this exercise let's use the relationship between work and the change in kinetic energy
W = ΔK
the expression for work is
W = - τ Δθ
where the negative sign indicates that the torque is in the opposite direction to rotation
kinetic energy
K = ½ I w²
we substitute
- τ Δθ = 0 - ½ I w²
θ = \(\frac{1}{2} \ \frac{I w^2}{\tau}\)
if we approach the rotor to a cylinder with an axis of rotation through its center
I = ½ m r²
we substitute
θ = ½ (½ m r²) \(\frac{w^2}{\tau}\)
How the measurements are in the English system, the weight
W = m g
m = W / g
let's reduce to the english system
w = 3600 rev / min (2pi rad / 1rev) (1 min / 60s) = 376.99 rad / s
r = 9 in (1 ft / 12in) = 0.75 ft
let's calculate
m = 125/32 = 3.91 slug
θ = ¼ 3.91 0.75² 376.99² / 2.5
θ = 3.126 10⁴ rad
let's reduce to revolutions
θ’= 3.126 10⁴ rad (1rev / 2π rad)
θ’= 4974.9 rev
θ '= 4975 rev
20 POINTS! I NEED IT ASP!
1 .
Ohm's Law
electroscope leaves repel
2 .
ion
charged atom
3 .
electromagnet
alignment of atoms
4 .
conductor
invented the lightning rod
5 .
magnetism
carries current
6 .
power
developed the light bulb
7 .
Thomas A. Edison
wire-wrapped core
8 .
Benjamin Franklin
V = I × R
9 .
like charges
I × V
Answers
Like Charges are the electroscope leaves repel, Ion is the charged atom. Magnetism is the alignment of atoms, Benjamin Franklin invented the lightning rod, Conductor carries a current.
What are Like charge?Like charges refer to the positive-positive or negative-negative charges whereas the unlike charges refers to set of positive-negative or negative-positive charges. Repulsion occurs in the like charges which refers to the force which makes the two charges move away from each other.
Like Charges are the Electroscope leaves repel. Ions are the charged atoms. Magnetism is the alignment of atoms. Benjamin Franklin invented the lightning rod. Conductor carries a current. Thomas Edison developed the light bulb. Electromagnet is a wire-wrapped core. Ohm's Law expression: V= I × R. And, Power is equal to I × V.
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A football player threw a football with a velocity of (3.0 m/s x + 5.0m/s y). How far did it travel horizontally?
Answers
The horizontal distance travelled by the football is 3.1 m.
What is the angle of projection of the ball?
The angle of projection of the football is calculated as follows;
tan ( θ ) = Vy / Vx
where;
Vy is the velocity of the ball in the vertical directionVx is the velocity of the ball in the horizontal directiontan ( θ ) = 5 / 3
tan ( θ ) = 1.667
θ = arc tan (1.667)
θ = 59⁰
The resultant velocity of the ball is calculated as follows;
v = √ (Vx² + Vy²)
v = √ (3² + 5²)
v = 5.83 m/s
The horizontal distance travelled by the football is calculated as follows;
x = v² sin(2θ) /g
where;
v is the resultant velocityg is acceleration due to gravityθ is the angle of projection of the ballx = [ (5.83)² sin(2 x 59) /9.8 ]
x = 3.1 m
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PLEASE HELP ASAP WILL GIVE 10 PTS
Which item is made from a synthetic material?
A. cotton pants
B. leather jacket
C. tissue paper
D. wicker basket
Answers
Answer: A. Cotton Pants
Explanation:
Answer:
A
Explanation:
The pulse of sound hits a stationary object and is reflected back to the bat. The pulse is received by the bat 0.12s after it was emitted. Calculate the distance travelled by the pulse of sound during this time.
Answers
Answer:
41.52 m
Explanation:
Using,
v = d/t....................... Equation 1
v = speed of pulse of sound, d = distance travelled by the pulse of sound, t = total time taken.
From equation 1, make d the subject of the equation
d = vt............................ Equation 2
Given: t = 0.12 s.
Constant: v = 346 m/s
Susbtitute these values into equation 2
d = 346(0.12)
d = 41.52 m
Which dog has the most kinetic energy?
A. A dog of mass 11 kg running with speed 5 m/s
B. A dog of mass 13 kg running with speed 3 m/s
C. A dog of mass 14 kg running with speed 2 m/s
D. A dog of mass 12 kg running with speed 4 m/s
Answers
Answer:
I'm pretty sure it'sssss A
convert 6000tons into kilograms
pls show workings
thank you
Answers
If you are using standard tons, then each ton is 907.18474 kg.
Multiply that and your answer is 5,443,108.44 kg.
If you are using metric tons, then multiply by 1,000.
6,000 * 1,000 = 6,000,000 kg
When discussing waves, the term medium refers to
Answers
Answer:
A medium is a substance or material that can carry a wave. The wave medium is not the wave and it does not make the wave; it merely carries or transports the wave from its source to other locations. ... Waves that transfer energy through a medium are called mechanical waves.