The sample summary paragraph which discusses an experiment and the results based on the reason why some substances require larger additions before a color change was seen is given below:
If the substance has a weak base solution (pH=8) and you add phenolphthalein, for example, you would only see a pink color change if a lot of phenolphthalein because it is used for stronger bases.
Also, when phenolphthalein is added to acids and weak bases, they tend to have a colorless coloration.
However, if phenolphthalein is added to a strong base, there would be a color change that is noticeable and it would be changed to pink.
What is a Strong Base?This refers to the compound that has the ability to remove a proton from a very weak acid.
Hence, we can see that a summary paragraph is given above based on the use of large addition of elements to some substances before there is a noticeable color change is mentioned above.
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The bisecting-angle instrument (bai) uses _____ to determine the correct pid angulation.
The bisecting-angle instrument (bai) uses aiming rings to determine the correct pid angulation.
What is Bisecting-angle instrument?This instrument is commonly used in dental medicine and radiography so as to achieve short cone technique x-rays.
It however employs the use of aiming rings for accuracy to determine the correct position-indicating device angulation thereby making it the most appropriate choice.
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The astronomy club placed the telescope on the tripod and that was their choice. according to the elements of style, which sentence is the best revision?
According to the Elements of Style, the telescope was set up on the tripod by the astronomy club.
To find the answer, we need to know about the revision.
How do revisions work?Simply put, a revision is a succinct summary of a situation or narrative.The astronomy club's decision to mount the telescope on the tripod qualifies as the best revision in this instance as defined by the Elements of Style. It effectively conveys the core concept.Thus, we can conclude that, according to the Elements of Style, the telescope was set up on the tripod by the astronomy club.
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→e pointing up and the magnetic field →b pointing west. what is the direction of wave propagation?
When the magnetic field is heading west and the electric field is pointing up, the wave propagation will be in the north.
How do we find out the direction of wave propagation?
Electromagnetic waves (EM-waves), as we are aware, are transverse. Electric and magnetic fields are both perpendicular to one another in EM waves (E⊥B).
Transverse waves are waves in which the propagation direction is opposite the direction of amplitude. for instance, gravitational waves, light waves, and water waves.
In this instance, the magnetic field is heading west while the electric current is pointing up towards the screen's layout.
∴ E x B = κ
where E= the direction of the electric field,
B = the direction of the magnetic field,
κ = at a particular point, the direction of propagation
The aforementioned equation is right-handed. When we put our finger towards ourselves (away from the screen) and curl it to the west, and the thumb will indicate the wave propagation direction ( north side ).
The propagation of waves in our instance is in the north direction.
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please explain the grandfather paradox
What must the charge (sign and magnitude) of a particle of mass 1. 45 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 660 n/c?
The charge (sign and magnitude) of a particle of mass 1.45 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 660 N/C is -2.19C
A particle with some charge moving in an electric field experience force due to electric field.
For the charged particle to remain stationary the force due to electric field and the weight of the particle should be equal.
Force due to electric field = QE
where, Q is the charge of the particle
E is the electric field = 660N/C
Weight of the particle = mg
where, m is the mass of particle = 1.45g = 0.00145kg
g is the acceleration due to gravity = 10m/s²
Hence, force due to electric field = weight of the particle
QE = mg
⇒ Q × 660 = 0.00145 × 10
⇒ Q = 2.19 C
Since the electric field is downward, hence to balance the charged particle, the force applied should be in the upwards direction. So, this is possible if the charge Q is negative.
So, the charged particle has a charge of -2.19C
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As additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected?.
As additional resistors are included lined up across a consistent voltage source, there are more ways for current to take.
So more current spills out of the source, and the all out current provided by the source increments.
The power supplied by the battery is (voltage) x (current). So if the voltage is constant and the current increases, the power being supplied must also increase.
What is a resistor?A resistor is an electrical part that cutoff points or manages the progression of electrical flow in an electronic circuit. Resistors can likewise be utilized to give a particular voltage to a functioning gadget like a semiconductor.
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Fuel crises will occur in future because of a. over use of petroleum
b. use of solar energy
c. over use of bio-gas
d. use of hydro-energy
A charge q = -10 µc experiences an electrostatic force of 35 mn to the left. What is the magnitude and direction of the electric field?
A charge q = -10 µc experiences an electrostatic force of 35 mn to the left.
The magnitude of electric field will be = 35 * [tex]10^{2}[/tex] N/C
Direction of the electric field will be from left to right
The force exerted by a charged body on another charged or uncharged body is called electrostatic force. This force is known as non-contact force because these forces comes into play even when the bodies are not in contact with each other.
Electric field, an electric property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.
given
q ( charge ) = -10 µc
Electrostatic force = 35 mN
Electric field = Force on charge / charge
= 35 * [tex]10^{-3}[/tex] / (-10 * [tex]10^{-6}[/tex])
= - 35 * [tex]10^{2}[/tex] N/C
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How many joules are required to convert 16. 5 g of ice at 0.0°C to liquid water at 32. 0°C?
7718.04 J joules are required to convert 16. 5 g of ice at 0.0°C to liquid water at 32. 0°C
Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree.
Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant).
heat require to convert 16.5 g of ice at 0°C to water at 0°C
Q1 = [tex]mH_{f}[/tex] = 16.5 * 334 = 5511 J
heat require to convert 0°C of water to water at 32. 0°C
Q2 = mcΔT = 16.5 * 4.18 *(32-0) = 2207.04 J
Total heat = Q1 + Q2
= 5511 J + 2207.04 J = 7718.04 J
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Read the scenario below and answer the question that follows. susan was in her algebra class preparing to take a test. her instructor, mrs. williams, tells susan, "try hard, even though math can be difficult for women to succeed in." what is the most likely effect of mrs. williams’ comment on susan’s test performance, and why? a. improved performance due to study behavior b. improved performance due to mores c. reduced performance due to stereotype threat d. reduced performance due to cultural shaping please select the best answer from the choices provided a b c d
The correct option is (c) reduced performance due to stereotype threat.
What is a culture of learning?
A culture of learning, or learning culture, is one in which employees continuously seek, share, and apply new knowledge and skills to improve individual and organizational performance.
How does culture affect learning?
Through the rewards and penalties it administers for each distinct conduct, a culture establishes context for behavior. Cultures reinforce appropriate behavior and deter inappropriate behavior via influencing behavior.Why is culture important in learning?
Students learn more deeply about the subject matter when working and learning in a classroom with people from different origins and cultures. Additionally, it teaches students how to participate in a diverse workplace using their unique skills and perspectives.Learn more about culture of learning
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Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65. The component of the longer vector along the line of the shorter is?
Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65. The component of the longer vector along the line of the shorter is 6.33 .
A vector is a quantity or phenomenon that has two independent properties: magnitude and direction. The term also denotes the mathematical or geometrical representation of such a quantity. Examples of vectors in nature are velocity, momentum, force, electromagnetic fields, and weight.
The taller component will be 15 . There will be two components taller component , one in the direction of shorter component and other perpendicular to the shorter wavelength .
The component of longer wavelength in the direction of shorter will be
= 15 cos (theta ) = 15 cos (65) = 6.33
where theta is the angle between both the vectors
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A rubber ball is dropped on the floor. The rebound speed is one-half the speed it had just before hitting the floor. It will rise to ________ of the original height from which it was dropped. Group of answer choices 1/3 1/8 1/6 1/4 1/5
Since the rebound speed is one-half the speed it had just before hitting the floor, it will rise to 1/4 of the original height from which it was dropped; option C.
What is rebound speed?Rebound speed refers to the speed at which a body when it hits a surface is returned or rebounded to the original direction in which it comes from.
When objects are released from a height and allowed to hit the floor, some of the original energy of the object is converted to heat and sound, thus the object will rebound with a lesser speed and to a smaller height than from which it is released.
In the case of a rubber ball which is dropped on the floor. The rebound speed is one-half the speed it had just before hitting the floor.
Therefore, the height will be one-quarter the original height.
In conclusion, the rebounding of a ball is to a lesser height than the original height.
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A particle moving at speed 0. 32 c has momentum p0. the speed of the particle is increased to 0. 72 c. what is its momentum now?
A particle moving at speed 0.32 c has momentum P₀. the speed of the particle is increased to 0.72 c then its momentum would be 2.25P₀.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
Mathematically the formula of the momentum is
P = mv
where P is the momentum of the particle
m is the mass of the particle
v is the velocity by which the particle is moving
As given in the question a particle moving at speed 0.32 c has momentum P₀. the speed of the particle is increased to 0.72 c
by using the formula of the momentum and substituting the values of the velocity
P =mv
As mentioned in the question when the particle is moving with 0.32c velocity it has a momentum of P₀
P₀ = m*(0.32c)
If the speed of the particle is increased to 0.72 c the momentum would be
P=m*(0.72c)
by dividing the second equation from the first one
P₀/P = 0.32c/0.72c
P₀/P = 0.44
P =2.25P₀
Thus, the increased momentum of the particle would be 2.25P₀
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According to current scientific understanding, the idea that the milky way galaxy might be home to a civilization millions of years more advanced than ours is.
According to contemporary scientific understanding, the thought that the Milky Way Galaxy energy is home to a civilization millions of years more developed than ours is. one reasonable solution to Fermi's paradox.
What is the milky way galaxy?Our Milky Way galaxy is simply one of the billions of galaxies in the universe. Within it, there are at smallest 100 billion stars, and on moderate, each star contains at least one planet circling it. This means there are potentially thousands of planetary procedures like our solar system within the galaxy!The Milky Way gets its name from a Greek myth about the goddess Hera who sprayed milk across the sky. In other parts of the world, our galaxy goes by different names.The Milky Way is about we look. Up, down, left, right, that is the Milky Way. From Earth, it can be noticed as a hazy form of stars in the evening sky that the stripped eye can barely notice. You can visit the Milky Way all year, no matter where you are on the earth.To learn more about Milky Way galaxy, refer to:
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Physics question, please answer this ASAP, thanks!
(a) The gravitational force received by each 1 kg mass is 8.66 N.
(b) The magnitude of gravitational acceleration is 8.66 m/s².
(c) The orbital speed of the ISS is 7,663.6 m/s.
(d) The time take for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.
Gravitational force received by each 1 kg mass
The gravitational force received by each 1 kg mass is calculated as follows;
F = Gm₁m₂/r²
where;
m₁ is mass of Earthm₂ is mass of ISSr is the distance between the ISS and center of EarthF = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ x 1) / (6780,000)²
F = 8.66 N
Magnitude of gravitational accelerationmg = GMm/r²
g = GM/r²
where;
M is mass of Earthg = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ ) / (6780,000)²
g = 8.66 m/s²
Orbital Speed of the ISSv = √GM/r
v = √(6.67 x 10⁻¹¹ x 5.97 x 10²⁴ / 6780,000)
v = 7,663.6 m/s
Time of motion of the ISS round the EarthT = 2πr/v
T = (2π x 6780,000) / (7663.6)
T = 5,558.75 seconds
1 hour = 3600 seconds
= 5,558.75/3600
= 1.54 hours
Thus, the gravitational force received by each 1 kg mass is 8.66 N.
The magnitude of gravitational acceleration is 8.66 m/s².
The orbital speed of the ISS is 7,663.6 m/s.
The time take for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.
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The diagram below shows a wire carrying a current between the poles of a large horseshoe magnet.
In which direction does the magnetic force act on the wire?
A
towards 1
B
towards 2
C
towards 3
D
towards 4
The magnetic force is acting towards 2.
It is given that the diagram below shows a wire carrying a current between the poles of a large horseshoe magnet.
We need to determine in which direction does the magnetic force act on the wire.
We will use Fleming's left hand rule here.
It states that
If we arrange our thumb, forefinger and middle finger of the left-hand perpendicular to each other, then the thumb points towards the direction of the force experienced by the conductor, the forefinger points towards the direction of the magnetic field and the middle finger points.
According to this, the magnetic force is acting towards 2.
Option B is correct.
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The magnetic force is acting towards 2 direction. the correct answer is option(b).
An electric charge, an electric current, and magnetic materials are all affected magnetically by a magnetic field, which is a vector field. A force perpendicular to the magnetic field and its own velocity acts on a moving charge in a magnetic field. Given that the illustration below depicts a wire conducting a current between the poles of a sizable horseshoe magnet, it is assumed. We must ascertain the direction in which the magnetic force acts on the wire.
Here, the Fleming left-hand rule will be applied. The thumb, forefinger, and middle finger of the left hand are arranged perpendicular to one another, with the thumb pointing in the direction of the force experienced by the conductor and the forefinger and middle finger pointing in the direction of the magnetic field. This indicates that the magnetic force is pulling in the direction of 2.
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When a metal is illuminated by light, photoelectrons are observed provided the light's wavelength is less than 669 nm. What is the metal's work function (also called the binding energy)?
When a metal is illuminated by light, photoelectrons are observed provided the light's wavelength is less than 669 nm. The work function will be 0.030 * [tex]10^{-17}[/tex] J
The work function (or work function) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.
When light of suitable frequency falls on a metal surface, electrons are emitted. These photo (light) generated electrons are called photoelectrons
h = 6.62 x [tex]10^{-34}[/tex] J/Hz
c = 3 * [tex]10^{8}[/tex] m/s
lambda = 669 * [tex]10^{-9}[/tex] m
work function = h*c/lambda
= 6.62 x [tex]10^{-34}[/tex] * 3 * [tex]10^{8}[/tex] / 669 * [tex]10^{-9}[/tex]
= 0.030 * [tex]10^{-17}[/tex] J
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The strip of the sky through which the sun, the moon, and the bright planets appear to move in the course of a year is called:_______.
Answer:
Milky way galaxy
Explanation:
This is where the sun is the main star whereby the other planets and stars revolve around it in a cycle
I have provided a picture of the question
Answer:
7.8 x 10^18 electrons
Explanation:
1 Coulomb is 6.24 x10^18 charges multiply this by 1.25 to get the answer above
What are some ways in which the temperature of a substance can be measured
The three most normal units of estimation for temperature are Celsius, Fahrenheit, and Kelvin.
A thermometer is an instrument that measures temperature. It can gauge the temperature of a strong, for example, food, fluid like water, or gas like air.
The Celsius scale is important for the decimal measuring standard. The decimal standard of estimation additionally incorporates units of mass, like kilograms, and units of length, like kilometers. Most logical fields measure temperature utilizing the Celsius scale. Zero degrees Celsius is the edge of freezing over water, and 100 degrees Celsius is the limit of water. Three countries don't utilize the Celsius scale. The United States, Burma, and Liberia utilize the Fahrenheit scale to quantify temperature. In any case, even in these nations, researchers utilize the Celsius or kelvin scale to gauge temperature. Water freezes at 32 degrees Fahrenheit and bubbles at 212 degrees Fahrenheit. The Kelvin scale is utilized by physicists and different researchers who need to record exceptionally exact temperatures. The Kelvin scale is the main unit of estimation to incorporate the temperature for "outright zero," the complete shortfall of any intensity energy.
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What is the inductance of a coil if the coil produces an emf of 2.50 v when the current in it changes from -28.0 ma to 25.0 ma in 12.0 ms?
The inductance of a coil if the coil produces an emf of 2.50 v when the current in it changes from -28.0 ma to 25.0 ma in 12.0 ms is L = 0.566 H
An inductor is a passive electronic component that stores energy in the form of a magnetic field. In its simplest form, an inductor consists of a wire loop or coil. The inductance is directly proportional to the number of turns in the coil.
The SI unit of inductance is Henry abbreviated as 'H'. It is defined as the measure of electric current changes at one ampere per second resulting in an electromotive force of one volt across the inductor.
The expression for induced emf
E=−L (di /dt)
L= E (dt / di )
di = 25 - ( -28) = 53 mA = 53 * [tex]10^{-3}[/tex] A
dt = 12 ms = 12 * [tex]10^{-3}[/tex] sec
E = 2.5 V
L = 2.5 ( 12 * [tex]10^{-3}[/tex] / 53 * [tex]10^{-3}[/tex] )
L = 0.566 H
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How would you position a flat loop of wire in a changing magnetic field so that there is no induced emf in the loop?
Position the loop so that the field lines run perpendicular to the area vector or parallel to the surface so that there is no induced EMF in the loop
Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts.
Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface. In electronics, the term applies to any electrostatic field and any magnetic field . Flux is depicted as "lines" in a plane that contains or intersects electric charge poles or magnetic poles.
As we all know that a moving charged particle will experience force by a magnetic field, the magnetic field produced by the field coil remains constant, that is, no force is experienced by electrons of the wire. So, we have to produce a relative motion between magnetic field and electrons.
Whenever the flux passing through the coil changes by any way (like either changing angle, magnetic field or area of coil), we are actually producing a relative motion between electrons and magnetic field. As a result, the electrons experience a magnetic force and shift to produce
flux = [tex]\int\limits {BAcos(theta)} \,[/tex]
theta = angle between magnetic field and area
Since we know , EMF get induced only when flux changes , if their is no flux change , no EMF can be induced
Hence , in order to not induce any kind of EMF ,we need to maintain a constant flux , but in question it is a changing magnetic field which means changing flux ,in this situation we need to align a flat loop parallel to magnetic field so , their is zero flux through the loop .
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The component of the normal force on the object parallel to the plane balances the friction force on the object.True/False
True. The component of the normal force on the object parallel to the plane balances the friction force on the object at rest.
What is component of normal force parallel to the plane?
An object placed on an inclined plane is subject to three forces, namely;
Normal force acting downwardsComponent of the normal force acting parallel to the planeFrictional force, parallel to the planeNet force acting on the object at rest∑F = 0
mg sinθ - μFₙ cosθ = 0
mg sinθ = μFₙ cosθ
where;
mg sinθ is component of the normal force acting parallel to the planeμFₙ cosθ is frictional force, parallel to the planeThus, the component of the normal force on the object parallel to the plane balances the friction force on the object at rest.
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What is the molar concentration of a 300.0 ml solution containing 5.00 g of nh3?
The molar concentration of a 300.0 ml solution containing 5.00 g of NH3 will be 0.98 mol/L
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.
A mole is defined as the amount of a substance that contains exactly 6.02214076 X1023 elementary entities of the given substance. Thus, a mole of a substance is referred to as the mass of a substance containing the same number of fundamental units as atoms in exactly 12.000 g of 12C.
1 mol of NH3 has a mass of 17 g
Moles of NH3 = 5 g of NH3 * (1 mol of NH3 / 17 g of NH3)
= 0.294 mol of NH3
Litres of solution = 300 mL solution ×( 1 L solution/1000mL sol)
= 0.300 L of solution
Molarity = moles of solute / litres of solution
= 0.294 / 0.300 = 0.98 mol/L
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A current of 0.4 A flows through a wire. How many electrons flow through a cross section of
the wire in one hour?
(Ans. e = 1.6 x 10-¹9 C
diameter? mm carries a steady current of 0.3142 A. Find the magnitude of
9 × 10²¹ electrons flow through a cross section of the wire in one hour.
What is the relation between current and charge?Mathematically, current = charge / timeIn S.I. unit, Charge is written in Coulomb and time in second. What is the amount of charge flown through a wire for one hour if it carries 0.4 A current?Charge= current × timeCurrent= 0.4 A, time = 1 hour= 3600 sCharge= 0.4× 3600= 1440 C
How many numbers of electrons present in 1440C of charge?One electron= 1.6 × 10^(-19) CSo, 1440 C = 1440/1.6 × 10^(-19)= 9 × 10²¹ electrons
Thus, we can conclude that the 9 × 10²¹ electrons flow through a cross section of the wire in one hour.
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What total energy (in kj) is contained in 1. 0 mol of photons, all with a frequency of 2. 75 × 10^14 hz?
The total energy contained in 1 mol of photons is 109.75 KJ / mol
Given,
Frequency = 2.75 × 10 ^ 14 hz
We know that, Energy = Number of photons × Energy in one photon
= n h v
= (6.023 × 10^23) × ( 6.626 × 10^-34) ×( 2.75×10^14)
=109.75 KJ/mol
Concepts
The total energy of a system is the sum of its gravitational potential and kinetic energy, and this total energy is preserved in orbital motion. To depart a planet and not return, objects should have a minimum velocity, known as the Escape Velocity
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write the factors of which affect pressure
Answer:
They are:
1. Height of liquid
2. Density of liquid
3. Acceleration due to gravity
If the current coming out a battery in a series circuit is 2 A, the current going into
the battery on the other side must be
Answer:
2 A
Explanation:
Kirchhoff Laws to the circuit consisting more than two batteries, the current leaving the battery is as same as entering the battery
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Newton's reformulation of kepler's third law allows us to measure the masses of bodies in orbit around each other, if we can measure?
Newton's reformulation of kepler's third law allows us to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution
Isaac Newton made a reformulation of the 3rd law of Kepler with regards to the orbital periods of a planet and this helped to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution
What is kepler's third law?This refers to the law of physics that states that the square of the orbital periods of a planet is directly proportional to the cube of the semi-major axis of its orbit
Hence, there was a reformulation of the 3rd law of Kepler by Isaac Newton with regards to the orbital periods of a planet and this helped to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution
This shows that the distances and periods of revolution are key aspects to neasyre the masses of bodies in orbit around each other,
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The resistivity of the material of a wire is 1. 76 × 10-8 ωm. if the diameter of the wire is 2 × 10-3 m and its length is 2 m, what is its resistance?
The resistivity of the material of a wire is 1. 76 × 10-8 ωm. if the diameter of the wire is 2 × 10-3 m and its length is 2 m, then its resistance is 0.0112Ω
The resistance of a wire is solely determined by its length, cross-section area, and resistivity. So we calculate the resistance of a wire by knowing its diameter, length, and resistivity (which varies depending on the material). The resistance provided by a unit length of conductor with a unit area of cross-section is defined as resistivity. Its SI unit is the ohm-meter.
It does not alter as the wire length increases, but resistance increases fourfold when the wire is stretched to double its original length. Resistivity is defined as the electrical resistance per unit length and cross-sectional area of a conductor.
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