A person has a choice of either pushing or pulling a book of ice with a mass of 50kg at a constant velocity. Assuming a coefficient of friction on 0.2 and pushing or pulling at the angle depicted, calculate the applied force needed for situations (a) and (b).
Answers
The applied force needed for situation a and b are 211. 31 Newton and 453. 15 Newton respectively.
How to determine the applied forceWe have that the force for situation 'a' is on an angle of inclination of 25° with the book of ice.
Thus,
Applied force = mg × sine of angle of inclination
Where mass, m = 50kg
g = acceleration due to gravity = 10m/s^2
Applied force = 50 × 10 × sin 25
Applied force = 50 × 10 × 0. 4226
Applied force = 211. 31 Newton
For situation 'b', the mass of block is adjacent to the book of ice, thus
Applied force = mg × cos of angle of inclination
Applied force = 50 × 10 × cos 25
Applied force = 50 × 10 × 0. 9063
Applied force = 453. 15 Newton
Thus, the applied force needed for situation a and b are 211. 31 Newton and 453. 15 Newton respectively.
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Related Questions
A diagram shows a measuring cylinder containing a liquid, and that same measuring cylinder when it is empty. What is the density if the mass is 190g and the volume is 24cm3?
Answers
The density, given that the mass is 190 g and the volume is 24 cm³ is 7.92 g/cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density Mass = 190 gVolume = 24 cm³Density =?Density = mass / volume
Density = 190 / 24
Density = 7.92 g/cm³
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explain about 3 pulley sytem and 4 pulley system and both of their uses.
Answers
Answer:
Fixed pulleys are a very common pulley. These pulleys are secured to a single spot. ...
Movable Pulleys are yet another type of pulley. ...
Compound Pulley Systems are a combination of both movable and fixed pulleys.
Explanation:
there are three different types of pulleys:
Fixed pulleys are a very common pulley. These pulleys are secured to a single spot. ...
Movable Pulleys are yet another type of pulley. ...
Compound Pulley Systems are a combination of both movable and fixed pulleys.
Horizontal angulation is: Group of answer choices the side-to-side angulation. different when using the paralleling and bisecting techniques. correct when the central ray is parallel to the curvature of the arch. determined by the Stabe bite-block.
Answers
Option A is correct as horizontal angulation is the side- to -side angulation.
When the dental X-ray tube head is positioned and the center ray is pointed in a horizontal, or side-to-side, plane, this is referred to as horizontal angulation.
It remains the same when using the paralleling and bisecting techniques.
The central ray should not be directed parallel to the curvature of the arch.
Instead, it is pointed perpendicular to the curve of the tooth arch and film to prevent errors in x-ray interpretation.
A radiograph with "open" contacts is the result of proper horizontal angulation.
A radiograph with "overlapped" contacts results from incorrect horizontal angulation.
Hence, option A is correct
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If you run around a circular track with a radius of 10m, what is the displacement after 3 full laps back to the start line?
Answers
Displacement will be zero.
What is displacement and how is it different from distance?Displacement:
It is the shortest distance between an object's beginning position and ending position.The quantity is a vector.It may be zero, positive, or negative.Displacement may be greater than or equal to distance.In the given question, we start from one point and finish at the same point around the circular track. Therefore there is no distance between the initial and final points because they are the same. That's why the displacement is zero.
Distance:
It is the actual path or distance that an object takes to go from its starting point to its finishing point.The quantity is a scalar one.It cannot be 0 or negative; it must be positive. Displacement and distance may be equal.Learn more about displacement here:
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. If the moon orbits Earth along the exact ecliptic (as the sun does): a. precession would not occur. b. days and nights would no longer be equal on the dates of the equinoxes. c. a total lunar and a total solar eclipse would occur every month. d. ocean tides would not occur.
Answers
If the moon orbits Earth along the exact ecliptic a total lunar and solar eclipse would occur every month.
The answer is option C.
A solar eclipse happens when the Moon passes between the sun and Earth, casting a shadow on earth that either fully or partly blocks the sun's light in some areas. This most effective takes place every so often, due to the fact the Moon does not orbit inside the specific same plane because the solar and Earth do.
The moon's route crosses the ecliptic kind two times every month, and a solar eclipse takes place while the solar happens to be there at some point during the crossing. There's a terrific hazard of this approximately once each six months.
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Which astronomer's laws of motion helped to explain the heliocentric model
Answers
Answer:
( Galileo )discovered evidence to support Copernicus' heliocentric theory when he observed four moons in orbit around Jupiter
6. The volume of a water tank is 5 m × 4 mx 2 m. If the tank is half-filled with water, calculate the pressure exerted at the bottom of the tank.
Answers
Answer:
Height (h)=4m so. tank is half filled the debth will be or heigth will be 4m/2 =2m
Explanation:
Acceleration deu to gravity (g)=9.8m/s^2
Density (d)=1000kg/m^3
So
P= hdg
P= 2×9.8×1000
P= 19600pa
Which type of light is best for checking the security features of a california issued id or driver license?.
Answers
The type of light which best for checking the security features of a California issued id or driver license is a UV light.
What is a UV light?This is referred to as an ultraviolet light and is an electromagnetic radiation which glows in the dark.
This is why it is referred to as blacklight image and helps to see the details of the ID under any condition.
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A cat with a mass of 5 kg sits on a branch that is 26 m off the ground. What is
its gravitational potential energy? The acceleration of gravity is 9.8 m/s².
Answers
Answer:
1274 J
Explanation:
PE = m g h
= 5 * 9.8 * 26 = 1274 J
A baseball rolls along a flat parking lot in a straight line at a constant speed of 3.8 m/s. How
far will the baseball roll in 15s?
Answers
This is a uniform rectilinear motion (MRU) exercise.
To start solving this exercise, we obtain the following data:
DATA:V = 3.8 m/sD = ¿?T = 15 secTo calculate the distance, multiply the speed by the time.
We apply the following formula: d = v * t
We clear our data in the formula:
[tex]\bf{d=3.8\dfrac{m}{\not{s}}*15 \not{s} }[/tex]
[tex]\bf{d=57 \ m}[/tex]
The baseball in 15 seconds will roll a distance of 57 meters.
{ Pisces04 }
Who challenged the traditional belief that the orbits of the planets were spherical, showing that the five known planets moved around the sun in elliptical paths
Answers
Answer: Johannes Kepler challenged the traditional belief that, the orbits of the planets were spherical, showing that the five known planets moved around the sun in elliptical paths.
Explanation: To find the correct explanation, we have to know more about the History of planetary motion and the Kepler's laws.
What is the history of planetary motion?In B.C 350, Aristotle-Universe was composed of 55 concentric rotating sphere, centered in Earth.Aristarchus- Sun and stars were fixed, and the planets rotated about the sun.Ptolemy-Planets moves around the earth, in small circle.Copernicus-Retrograde motion of planets as observed from earth.Galileo-Motion of moons orbiting Jupiter.Kepler- Planet moves in an elliptical orbit.What is Kepler's law of planetary motion?First law: Planet moves in an elliptical orbit with sun as one of the foci.2nd law: Planets sweeps equal area in equal interval of time.3rd law: The square of the time period of motion is proportional to the cube of its mean radius.Thus, from the above explanation we can conclude that, Johannes Kepler challenged the traditional belief that, the orbits of the planets were spherical, showing that the five known planets moved around the sun in elliptical paths.
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1. The planet Jupiter completes a revolution of the sun in 11.5 years. Express it in seconds. Given that one year= 3.154 × 10^7 s.
Answers
Answer:
The planet Jupiter completes one revolution of the sun in 362710000 seconds. Long time, right?
Explanation:
3.154x10^7=3.154x10000000=31540000
11.5x31540000=362710000
Heat engine x has an efficiency of 67%. heat engine y has an efficiency of 82%. which best compares these two heat engines? heat engine x moves more thermal energy from cold to warm areas than heat engine y. heat engine x releases more energy to the surroundings than heat engine y. heat engine y releases more energy to the surroundings than heat engine y. heat engine y moves more thermal energy from cold to warm areas than heat engine x.
Answers
Heat engine y releases more energy to the surroundings than heat engine y compares the two heat engines in a better way.
Heat Engine:
It mainly works by bringing the working substance from warmer temperature to lower temperature. So, in the process of going through this cycle, the system performs some work on the surrounding. Then more work will be done by a more efficient engine.In the question, it is said that x has an efficiency of 67% and y has an efficiency of 82%.
Therefore, Heat Engine y releases more energy to the surroundings than heat engine y. Hence, option (c) is correct.
Incorrect options:
(a) It is incorrect because Heat engines work by taking heat from hotter regions to colder regions.
(b) It is incorrect because the efficiency of x is less than y.
(d) It is also incorrect because Heat engines work by taking heat from a hotter region to a colder one.
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A bus decreases its speed from 80km/h to 60km/h in 5 seconds. find the acceleration of the bus.
Answers
The acceleration of the bus is 1.1 m/s²
What is acceleration?Acceleration is defined as the change in the velocity of an object with time.
Acceleration = change in velocity/timeChange in velocity = Final velocity - initial velocityChange in velocity of the bus = 60 - 80
Change in velocity of the bus = -20 km/h = -5.5 m/s
Time = 5 seconds
Acceleration = -5.5/5
Acceleration = 1.1 m/s²
In conclusion, acceleration is the rate of change of velocity with time.
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A driver in a 2,000 kg SUV moving at 15 m/s crashes into a stopped car, causing it to be propelled forward and the truck to be slowed to 10 m/s. What is the work done on the SUV by the stopped car
Answers
The work done on the SUV by the stopped car is .
Given:- A driver in a 2,000 kg SUV moving at 15 m/s crashes into a stopped car and the truck to be slowed to 10 m/s.
To Find:- We have to find the work done on the SUV by the stopped car.
By using the concept of speed it will be solved.
According to the problem,
The work done on the SUV by the stopped car is .
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If the satellite has a mass of 3900 kg , a radius of 4.3 m , and the rockets each add a mass of 210 kg , what is the required steady force of each rocket if the satellite is to reach 30 rpm in 5.4 min , starting from rest?
Answers
Answer:
The required steady force of each rocket is 28.79 N
Explanation:
mass of the satellite, M=3900 kg
radius, r=4.3 m
mass of rocket, m=210 kg
time, t=5.4 min
Moment of Inertia:
I = 1/2 (Mr^2) + 4mr^2
I = 1/2 ( 3900* (4.3)^2) + 4 (210)*(4.3)^2
I = 51587.1 kg m^2
the angular acceleration is:
a= w/t
here w= 2*π*30
so,
a= 2*π*30 / 5.4* 3600
a=0.0096 rad/ s^2
the Torque becomes:
T=I*a = 4r*F
( 51587.1 )*(0.0096) = 4*4.3* F
F= 28.79 N
the required steady force of each rocket is 28.79 N
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You are working on a laboratory device that includes a small sphere with a large electric charge Q. Because of this charged sphere, there is a strong electric field surrounding your device. Other researchers in your laboratory are complaining that your electric field is affecting their equipment. You think about how you can obtain the large electric field that you need close to the sphere but prohibit the field from reaching your colleagues. You decide to surround your device with a spherical transparent plastic shell. The nonconducting shell is given a uniform charge distribution. (a) The shell is placed so that the small sphere is at the exact center of the shell. Determine the charge that must be placed on the shell to completely eliminate the electric field outside of the shell. (Use any variable or symbol stated above as necessary.) 9 = x Your argument should be based on the use of Gauss's law to ensure the absence of an electric field outside the combination.
Answers
a) q_shell = -Q , b) q_shell = -Q
a) We can solve this exercise using Gauss's law
Ф = ∫ E. dA = /ε₀
For this we use a Gaussian surface that takes advantage of the symmetry of the problem, we select a sphere where this force of the spherical plastic shell.
In this case, the electric field lines coincide with the radii of the sphere and the scalar product reduces to the algebraic product, the area of the sphere
A = 4 π r²
fi = E 4π r² = q_{int} /ε₀
apply this formula to our case, we have that the charge inside the Gaussian sphere is
q_{int} = q_sphere + q_shell
the charge of the sphere is Q and the requirement is that there is no electric field outside the Gaussian sphere, for this, the net charge inside it must be zero
0 = Q + q_shell
q_shell = -Q
b) In Gauss's law, only the charge inside the Gaussian surface matters, not its position, therefore if the charge is not in the center the result remains the same.
q_shell = -Q
Please check the attached attachment for the detailed answer.
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On its own, a tow truck has a maximum acceleration of 5.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of three times its own mass
Answers
The maximum acceleration will be 1.6m/s^2
Let a1 = 5.0m/s^2
the maximum acceleration of the truck alone. The force produced by the engine to accelerate the truck in this situation is
F = ma1
with m being the mass of the truck alone.
If we attach a bus of twice the mass of the truck, now the whole system (truck+bus) has a mass of (m+2m)=3m. And in this case, the force produced by the engine is
F = 3ma2
with a2 being the new acceleration.
The engine is always the same, so the force produced is still the same, so we can equalize F written in the first equation and in the second equation:
ma1 = 3ma2
and find a2, the new acceleration
a2 = ma1/3
a2 = 5/3 m/s^2
Therefore a2 = 1.6m/s^2
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When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
Answers
If you double the number of turns and double the length, the value N/L remains the same and hence the magnitude of the magnetic field stays the same.
A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in.
The magnitude of the magnetic field in an infinite (L>>R) solenoid, is proportional to:
I*N/L
Where
I = current
N = number of turns
L = length of wire
So, if you double the number of turns and double the length, the value N/L remains the same and hence the magnitude of the magnetic field stays the same.
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Need help asap pls
An astronaut is stuck floating motionless in space and wants to get back to
her spaceship. By throwing objects in the opposite direction, she accelerates
enough to get back to the spaceship. The astronaut is using Newton's
law of motion.
O A. fourth
OB. third
O C. second
OD. first
Answers
for every action there is a reaction*
Two students push on a crate to slide it across the floor. One student exerts a force of 5 N to the east, and the second exerts a force of 4 N to the south. What is the magnitude of the net force the students exert on the crate
Answers
The magnitude of the net force the students exert on the crate is 6.40 N.
We have to apply the Pythagorean theorem so we have:
F= [tex]\sqrt{5^{2}+4^{2} }[/tex]
=[tex]\sqrt{25+16}\\[/tex]
=[tex]\sqrt{41}[/tex]
Finally, we have:
F = 6.40 N
In mathematics, the Pythagorean theorem, or Pythagoras' theorem, is an essential relation in Euclidean geometry some of the three sides of a right triangle. It states that the vicinity of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other aspects.
Pythagorean theorem, the geometric theorem that the sum of the squares at the legs of a right triangle is identical to the rectangular at the hypotenuse (the facet opposite the right perspective) or, in familiar algebraic notation, a2 + b2 = c2.
A Pythagorean triple consists of three fantastic integers a, b, and c, such that a2 + b2 = c2. this sort of triple is normally written (a, b, c), and an instance is (3, four, 5). If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any wonderful integer.
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Find the pressure exerted on the floor by a 100N box whose bottom area is 40cm x
50cm.
Answers
Answer:
Pressure exerted = 500 Pa
Explanation:
The formula for pressure is as follows:
[tex]Pressure = \frac{Force \space\ applied}{Area}[/tex]
In this case,
Force applied = 100N
Area = 40cm × 50cm = 2000cm² = 2000 × 10⁻⁴ = 0.2m²
Substituting these values into the formula:
Pressure = [tex]\frac{100}{0.2}[/tex]
⇒ Pressure = 500 Pa
Answer:
500Pa
Explanation:
Pressure = Force / Area where area is in [tex]m^{2}[/tex].
Firstly, lets convert both area dimensions into metrers.
40cm = 40/100 m = 0.4m
50cm = 50/100 m = 0.5m
Area of Bottom area of box = 0.4m x 0.5m = [tex]0.2m^{2}[/tex]
Pressure = [tex]\frac{100N}{0.2m^{2} }[/tex]
= 500Pa
Moving a charge from point A, where the potential is 400 V, to point B, where the potential is 120 V, takes 4.3×10−4 J of work
What is the value of the charge?
Express your answer with the appropriate units.
Answers
The charge is obtained as 1.5 * 10^-5 C.
What is potential?The electric potential is the work done in moving a unit charge from one point to another.
Now we have;
W = -QdV
W = Work done in joules
Q = charge
dV = voltage change
Hence;
4.3×10−4 =- Q( 120 - 400)
Q = 4.3×10−4/280
Q = 1.5 * 10^-5 C
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A wire of a given material has an electric field of 0.100 mV/m when a potential is applied. The wire has 8.49 x 1028 conduction electrons per cubic meter and a mean free time between collisions of 2.50 x 10-14 s. What is the uniform current density in the wire
Answers
The uniform current density in the wire is 5.43 x 10²⁷ A/m².
Current density in the wireThe uniform current density in the wire is calculated as follows;
J = total current / total area
The given parameters:
Conduction of the wire = 8.49 x 10²⁸ e/m²time, t = 2.5 x 10⁻¹⁴ s[tex]J = \frac{I}{A} = \frac{Q}{At} \\\\J = \frac{8.49 \times 10^{28}e/m^3 \ \times \ 1.6 \times 10^{-19} \ C/e}{2.5 \times 10^{-14} \ s \ \times ( 0.1 \times 10^{-3} \ V/m)} \\\\J = 5.43 \times 10^{27} \ A/m^2[/tex]
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A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Draw the image formation in this case.
Answers
Answer:
It is given that the image is formed at a distance of 50cm from the lens. And since the image is real, v = +50cm. This means that u = -50cm. Therefore, the needle must be placed at a distance of 50cm from the lens.
Explanation:
Establishing a high critical value when calculating the results of a statistical test means that a researcher will have more confidence in finding significance than when a lower critical value is established. Please select the best answer from the choices provided T F
Answers
The statement 'establishing a high critical value in a statistical test is associated with more confidence' is TRUE.
What is statistical significance?The statistical significance is a arbitrary value used to indicate that data collected can be used to confirm (or reject) my working hypothesis.
The most widely used value to measure the statistical significance is the p threshold.
In conclusion, the statement 'Establishing a high critical value when calculating the results of a statistical test means that a researcher will have more confidence in finding significance than when a lower critical value is established' is TRUE.
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Answer:
The answer is F or false
Explanation:
correct edge 2023
An 80-kg hiker climbs to the top of a tall hill and builds up 470,000 j of gravitational potential energy. how high did the hiker climb? round the answer to the nearest hundred. meters
Answers
Answer: An 80 kg hiker climbs to the top of a tall hill and builds up 470000J of gravitational potential energy. With this energy, he can climb up to 600m of Hight.
Explanation: To find the answer, we need to know about the Gravitational potential energy.
What is the gravitational potential energy?Gravitational potential energy can be defined as, the potential energy associated with a gravitational field.It has an expression,[tex]U=mgh[/tex]
where,U is the gravitational potential energy, m is the mass of the body, g is the acceleration due to gravity and h is the height.
How to solve the problem?As we know that the expression of height from the expression of gravitational potential energy as,[tex]h=U/mg[/tex]
We have, [tex]m=80kg[/tex] , [tex]U=470000J[/tex] and [tex]g=9.8 m/s^{2}[/tex] .Substituting these into the equation, we get, height as,[tex]h=470000/(80*9.8)=599.98=600 m[/tex]
Thus, from the above calculation, we can conclude that, he can climb up to 600m of Hight.
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Answer: 600 m
Explanation: Got correct on Edge
true or false Immediately after the switch is closed, there is no current flowing through the resistor.
Answers
True. Immediately after the switch is closed, current only flows through the capacitor and not through the resistor. This is because the resistor offers resistance to the current flow while the capacitor acts as a short in the circuit.
What is a RC circuit?
Consider the circuit diagram shown below. This circuit is known as an RC circuit. In an RC circuit:
The capacitor C is connected in parallel with resistor R and potential V.When the switch is kept open, i.e. no potential is applied to the circuit for an extended period of time, the charge stored in the capacitor dissipates.This leads to the current to stop flowing thorough the other components of the circuit.Thus, when potential is applied across the capacitor (uncharged), the capacitor initially behaves as a closed wire and offers no resistance as the current flows through it whilst charging it.Once the capacitor has been charged for a long period of time, it acts as a break in the circuit wherein no current can flow through it.Now, when a switch is placed in the circuit, after the switch has been kept open for a long time, closing it causes the relative current and potential in the circuit to depend upon the state of charge in the capacitor at that instant.Supposing that the capacitor has been kept uncharged for a long period of time, at this instant when the switch is closed, only the current flows through the capacitor and not through the resistor.
This is because the resistor offers resistance to current flow while the capacitor acts as a short in the circuit.
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Complete the statement below.
In a neutralization reaction,
and hydroxide iOns react to form.
Answers
Answer:
In a neutralization reaction, hydronium and hydroxide ions react to form water.
Explanation:
Acids/Bases and how they interact:
A Bronsted-Lowry base is a substance that tends to bond with and "steal" a hydrogen ion, while an acid is a molecule containing a hydrogen ion that prefers to dissociate. Acids "give up" their hydrogen ions to water molecules in water, resulting in the formation of a hydronium ion. The pH of a given solution is determined by the amount of hydronium ions present.
A quick neutralization reaction takes place when a base is added to an acid because bases want to "take" the hydrogen. We have the ideal combination of bases that want to "take" the hydrogen ion and acids that want to "give up" the hydrogen ion, which allows them to neutralize one another. A conjugate base is created when hydrogen separates from an acid; having had its hydrogen torn from the complex, it may now receive a hydrogen (i.e., acts as a base). Once the base has a hydrogen, it behaves as a conjugate acid; it may then "lose" that hydrogen and behave as an acid.
Depending on which form the molecule favors, the acid's potency varies. The fact that hydrochloric acid (HCl) fully dissociates in aqueous solutions makes it a powerful acid:
HCl + H₂O -> Cl- + H₃O+
That is to say that the reaction equation strongly favours the right side.
Acetic acid, on the other hand, is a weak acid because only a small part of it dissociates:
CH₃COOH + H₂O <--> CH₃COO- + H₃O+
In contrast to the bulk of the chemical, which is shown on the left in the uncharged state, only a minor portion of acetic acid dissociates.
This brief explanation of acids and bases anthropomorphizes chemical substances as aware creatures with specific preferences for certain actions. These so-called "preferences" are, in reality, rough summaries of the relative stabilities of the compounds (acid vs. its conjugate base), mostly as a result of electrical processes.
Answer:
hydrogen and water other answer is wrong
Explanation:
What can you say about the drop in potential energy (per unit mass or volume) of water traveling through either pipe? What can you say about the drop in potential energy (per unit mass or volume) of water traveling through either pipe? The drop is greater for pipe L. The drop is greater for pipe S. The drop is the same for both pipes.
Answers
The drop is the same for both pipes.
The analogy between water pressure, water flow, voltage, and current:
Both the pressure created by the pump at the top of the pipes and the pressure at the bottom of the pipes are equal (taken to be zero). Since the fluxes vary, the pressure drop across each pipe is also variable. This circuit is an analog of parallel resistors, where the voltage for each resistor is the same, but the currents vary if the resistances are not equal.
When water flows from a small pipe to a large pipe, the flow (measured, for instance, in gallons per minute) is the same in both pipes, because the amount of water entering one pipe must equal the amount leaving the other. Otherwise, water would build up in the pipes. For the same reason, circuit components connected in series have a constant total electric current. Water pressure and total electric potential (voltage) are comparable, and a pump is comparable to a battery. Similar to how electricity going through a resistor decreases in voltage, water traveling through pipes lose pressure. In a battery, chemical reactions cause charges to flow against the average due to the pump's utilization of mechanical work to increase the potential energy of the water.
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