The magnitude of this vector is 15
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 magnitude of a vector formula is used to calculate the length for a given vector (say v) and is denoted as |v|. So basically, this quantity is the length between the initial point and endpoint of the vector.
Let vector be = a
component of vector in x direction = 10 i
component of vector in y direction = 10 j
component of vector in z direction = 5 z
vector a = 10 i + 10 j + 5 z
magnitude of vector a = |a| = [tex]\sqrt{10^{2} +10^{2} + 5^{2} }[/tex]
= 15
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A circuit has a voltage drop of 24.0 V across a 30.0 ohm Resistor that carries a current of 0. 800 A what is the power conducted by the resistor ? Use P =VI
The power conducted by the resistor, given that it carries a current of 0.8 A is 19.2 Watts
What is power?Mechanical Power can be defined as the rate at which energy is consumed. This is also true for Electrical power, since it gives an expressing of the rate in which Electrical energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
With the above formula, we can determine the power as illustrated below:
How to determine the powerfrom the question given above, the following data were obtained:
Voltage (V) = 24 VResistor (R) = 30 ohmsCurrent (I) = 0.8 APower (P) =?Power (P) = voltage (V) × current (I)
P = IV
P = 24 × 0.8
P = 19.2 watts
Thus, the power conducted by the resistor which carries the current of 0.8 A is 19.2 Watts
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The bronsted-lowry model focuses on the transfer of _______ in an acid-base reaction.
a) electrons h
b) oh- neutrons
c) orbitals
The Bronsted-Lowry model focuses on the transfer of H⁺ in an acid-base reaction.
What is the Bronsted-Lowry theory?According to the Bronsted-Lowry theory, often known as the proton theory of acids and bases, any substance that can transfer a proton to another substance is an acid, and the substance that accepts the proton is a base. Because it makes up the nucleus of a hydrogen atom, a proton is a nuclear particle with a unit positive electrical charge; it is denoted by the symbol H⁺.
The Bronsted-Lowry scheme states that an object can only act as an acid in the presence of a base and that an object can only act as a base in the presence of an acid. In addition, when a basic substance obtains a proton, it generates an acid known as the conjugate acid of a base, and when an acidic substance loses a proton, it forms a base known as the conjugate base of an acid.
I understand the question you are looking for is this:
The Bronsted-Lowry model focuses on the transfer of _______ in an acid-base reaction.
a. neutrons
b. OH-
c. H+
d. orbitals
e. electrons
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I need help with this physics question ASAP. Thanks!
From the calculation, the horizontal distance is 310 m.
What is the range of a projectile?A projectile has to do with an object that is thrown at an angle. Now we know that the range of the projectile is given by the formula; R = u^2sin2θ/g
We we know that;
g = acceleration due to gravity
θ = angle
u = velocity
R = (60)^2 sin2(30)/10
R = 310 m
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Physics question about grade and static friction. Pls help, thanks!
a.
i. The angle for telegraph hill is 17.48⁰ii. The coefficient of static friction has to be no less than 0.315b.
i. The angle for Canton Ave. is 20.3⁰ii. The coefficient of static friction has to be no less than 0.37c.
i.The angle for Bradford Street is 22.3⁰ii. The coefficient of static friction has to be no less than 0.41What is a grade?A grade is the ratio of the vertical rise to horizontal run of a road
What is the coefficient of static friction?The coefficient of static friction is a number which shows the amount of friction between two surfaces.
a. i. Angle for Telegraph hillSince grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Telegraph hill = 31.5%
= 31.5/100
= 0.315
θ = tan⁻¹(grade)
θ = tan⁻¹(0.315)
θ = 17.48⁰
So, the angle for telegraph hill is 17.48⁰
ii. Coefficient of static friction for Telegraph hillFor no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan17.48⁰
≥ 0.315
So, the coefficient of static friction has to be no less than 0.315
b. i. Angle for Canton Ave.Since grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Canton Ave. = 37%
= 37/100
= 0.37
θ = tan⁻¹(grade)
θ = tan⁻¹(0.37)
θ = 20.3⁰
So, the angle for Canton Ave. is 20.3⁰
ii. Coefficient of static friction for Canton Ave.For no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan20.3⁰
≥ 0.37
So, the coefficient of static friction has to be no less than 0.37
C. i. Angle for Bradford StreetSince grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Bradford Street = 41%
= 41/100
= 0.41
θ = tan⁻¹(grade)
θ = tan⁻¹(0.41)
θ = 22.3⁰
So, the angle for Bradford Street is 22.3⁰
ii. Coefficient of static friction for Bradford StreetFor no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan22.3⁰
≥ 0.41
So, the coefficient of static friction has to be no less than 0.41
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Certain car can accelerate from rest to the speed v in t seconds. if the power output of the car remains constant, (a) how long does it take for the car to accelerate from v to 2v? (b) how fast is the car moving at 2t seconds after starting
(a) time taken for the car to accelerate from v to 2v = t = [tex]\frac{2V-V}{a}[/tex]
(b) velocity of the car moving at 2t seconds = ΔV = 2at
(a) we know that,
a=[tex]\frac{V_{F}-V_{0} }{t}[/tex]
where, [tex]V_{F}[/tex] is the final velocity
[tex]V_{0}[/tex] is the initial velocity
a = acceleration
t = time
Time taken to accelerate from V to 2V:
t = [tex]\frac{2V-V}{a}[/tex]
(b) We know that,
a=[tex]\frac{V_{F}-V_{0} }{t}[/tex]
where, [tex]V_{F}[/tex] is the final velocity
[tex]V_{0}[/tex] is the initial velocity
a = acceleration
t = time
how fast is the car moving at 2t seconds after starting,
we can represent [tex]V_{F}[/tex] - [tex]V_{0}[/tex] = ΔV
at time = t= 2t, it becomes
a=[tex]\frac{V_{F}-V_{0} }{t}[/tex] = a = ΔV/2t
t= ΔV/2a
ΔV = 2at
What is acceleration?Rate of change of velocity with time, both in terms of speed and direction is known as acceleration.
What is speed?the rate at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.To learn more about acceleration visit:
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An experience that forces an individual to confront an existential issue is known as a?
An experience that forces an individual to confront an existential issue is known as a boundary situation in this type of context.
What is Boundary situation?
This type of situation is characterized by negative consequences which the individual tries to escape from in an unfruitful attempt. It usually makes the individual feel like it can't be overcome and is also likely to enter deep into the crisis.
This experience forces an individual to confront an existential issue so as to prevent it from escalating into a very difficult position and to promptly address the situation through employing different types of techniques. This ensures that a reoccurence doesn't come up in this type of situation.
This is therefore the reason why boundary situation was chosen as the most appropriate choice.
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What is the focal length (in meters) of a lens whose radius of curvature is 9. 2 m and has a refractive index 1. 2?
The focal length (in meters) of a lens whose radius of curvature is 9. 2 m and has a refractive index 1.2 will be 18.4 m
The focal length of a lens is determined when the lens is focused at infinity. Lens focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large individual elements will be.
Focal length of a lens is the distance between center of lens and focal point . Focal point is a point on principal axis , at which light rays parallel to principal axis meet after refraction through lens or seem to meet after refraction .
The radius of curvature is the radius of sphere formed by the convex or concave mirror. It is also equal to the distance between the pole and center of curvature. The sign convention for focal length and radius of curvature is the same.
focal length = 2 * radius of curvature
given
radius of curvature = 9.2 m
focal length = 2 * 9.2
= 18.4 m
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When constructing a climograph one needs to know the annual_________ temperature and wind speed.
A Final statement or concluding statement
When constructing a climograph one needs to know the annual average temperature and wind speed.
What is the purpose of Climographs?A climograph is a graph that depicts an area's average (mean) precipitation and temperature.
It is used to compare the climate of various locations.
Climographs are made to compare climates in various locations.
Climographs simplify a large amount of numerical data into a simple depiction of bars and lines.
Climographs are useful for observing trends in climate and comparing climates in different locations since they are so basic.
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A 15. 0 ampere current flows through a 4. 75 m section of wire, perpendicular to a 0. 250 t magnetic field. what is the magnitude of the force exerted by the field on the wire section?
Answer:
Approximately [tex]17.8\; {\rm L}[/tex].
Explanation:
Consider a straight wire section of length [tex]L[/tex] carrying a current of [tex]I[/tex]. If that wire is placed in a magnetic field of strength [tex]B[/tex] at an angle of [tex]\theta[/tex] relative to the field, the magnitude of the magnetic force on this wire would be:
[tex]F = B\, I\, L\, \sin(\theta)[/tex].
In this question, [tex]\theta = 90^{\circ}[/tex] since the wire is perpendicular to the magnetic field. The magnitude of the magnetic force on this wire would be:
[tex]\begin{aligned}F &= B\, I\, L\, \sin(\theta) \\ &= (0.250\; {\rm T}) \, (15.0\; {\rm A}) \, (4.75\; {\rm m})\, (\sin(90^{\circ}) \\ &\approx 17.8\; {\rm N} \end{aligned}[/tex].
Oppositely charged objects attract each other. this attraction holds electrons in atoms and holds atoms to one another in many compounds. however, ernest rutherford’s model of the atom failed to explain why electrons were not pulled into the atomic nucleus by this attraction. what change to the atomic model helped solve the problem seen in rutherford’s model? bohr’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder. bohr’s work with cathode rays led him to say that the electrons were located within the mass of positive material, like plums in a pudding. thomson’s work with cathode rays led him to say that the electrons were located within the mass of positive material, like plums in a pudding. thomson’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder.
The deficiency in Ernest Rutherford’s model of the atom about electron orbits was solved by Bohr’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder; option A.
What are atomic models?Atomic models are those models which were used to describe the structure of atoms by various scientists.
The models of the atom include:
Thompson's plum pudding modelRutherford's planetary modelBohr's modelBecause of certain deficiencies found in the atomic models by the various scientists, several modifications were made on the atomic model.
The fact that Ernest Rutherford’s model of the atom failed to explain why electrons were not pulled into the atomic nucleus was explained by Bohr’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder.
In conclusion, atomic models were used to explain the structure of atoms.
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Answer:
The answer to this is A: Bohr’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder.
Explanation:
I just did the quiz
For a 1 efficient step down transformer voltage in primary and secondary are equal current in primary and secondary are equal input power is same as the output power output power is zero
The given condition for a 100% efficient step down transformer is not true.
How do Step-down Transformers work?Because there are fewer turns in the secondary winding of a step-down transformer, the secondary voltage is lower than the initial voltage. As a result, this kind of transformer is employed to reduce the voltage to the levels intended for the circuit. Almost all power supply incorporate a step-down transformer to keep the operating voltage range of the circuit within acceptable limits. Electronic transformers and distribution systems are often where these transformers are installed (power transformers).
What Does a Step-Down Transformer Mean by Power?Using the system voltage and current, we can calculate the power of a transformer. Volt-Amps, or VA, is the unit used to measure the power in a transformer (for larger transformers Kilo Volt-Amps, kVA).
Any transformer should, in theory, have constant power on both sides, which implies that the power available on the secondary side of the transformer should match the power available on the primary side. This also applies to step-down transformers. A step-down transformer's secondary side has a lower voltage than its primary side, hence in order to balance the transformer's total power, the secondary current would need to be increased.
What is the Step-Down Transformer's Relationship Between Voltage and Current?In a step-down transformer, the output current is greater than the input current while the output voltage is lower than the primary voltage.
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The cells in the middle latitude atmospheric circulations on earth are called the__________?
The cells in the middle latitude atmospheric circulations on earth are called the ferrel, westerlies.
What is latitude atmosphere?The high latitude is roughly defined as being above 60° magnetic latitude; the middle latitudes are between 50° and 60° magnetic latitude; and everything below 50° magnetic latitude is regarded to be in the low latitude category. However, the precise location of this barrier is unknown.
Wait, what? magnetic horizons? And what is that? In any case, we usually refer to magnetic latitudes rather than geographic latitudes when discussing aurora and the various latitudes. You can claim that you have a better chance of seeing aurora when you are at a high geographic latitude (near the north or south pole). The earth's magnetic poles do not exactly align with the geographic poles, which makes what is generally true about it somewhat misleading.
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Two planets, john and mary, are identical in density and temperature, but mary is larger in size (radius) than john. which planet is likely to have a more substantial atmosphere?
Two planets, john and mary, are identical in density and temperature, but mary is larger in size (radius) than john. Mary will have more substantial atmosphere because mary is larger in size .
A substantial atmosphere is one dense enough to significantly affect the surface
Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.
The thickness of a planet's atmosphere depends on the planet's gravity and the temperature of the atmosphere. A planet with weaker gravity does not have as strong a hold on the molecules that make up its atmosphere as a planet with stronger gravity.
As the planet grows in size, its mass and therefore gravity increases, allowing it to capture not only the accumulated dust and rocks, but also the gas, which forms an atmosphere.
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a. Besides protons, what other particles make up an atom? Write 2 - 3 sentences identifying the attractive force acts between a proton and each of these other particles.
b. Identify the element whose atoms have 11 protons. It is a metal, nonmetal, or metalloid? Write 1 - 2 sentences describing how an atom of this element changes when it forms an ionic bond.
Electric force is present between proton and electron of an atom.
What is the attractive force present between a proton and electron?The attractive force between the electrons and the proton of the nucleus is called the electric force. This force attract electron towards the nucleus so that it can't escape from the atom easily so this force is very important for the atom.
How an atom of this element changes when it forms an ionic bond?An atom of this element changes when it forms an ionic bond because the number of electron decreases due to losing of electron in order to get stability. We know that ionic bond forms between atoms when electron is lost or gain by the atom.
So we can conclude that electric force is present between proton and electron of an atom.
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Drag the tiles to the correct boxes to complete the pairs. identify the type of synthetic material used in each object. alloy ceramic polymer
Tuba - Alloy
Paper - Polymer
Pot - Ceramics
Alloy : An alloy is a substance which made up of two more than two types of metal.
Ceramics: Articles, figures made up of clay which are hardened by the action of heating.
Polymer: These are the substance composed repeating units of of same chemical units which held together by covalent bonds.
What are Synthetic materials ?Instead of using natural materials, synthetic products are created using chemicals or synthetic materials. Boots constructed of synthetic materials, such as synthetic rubber, may typically be washed in a machine.
Because they differ significantly from natural materials in terms of their qualities or have improved through time, synthetic fabrics are beneficial. For instance, elastic Lycra maintains its shape in waterproof plastic raincoats, which are also made of plastic.Learn more about Synthetic materials here:
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The ____ rate, measured in kilohertz (khz), refers to the amount of samples obtained per second during the conversion from analog to digital sound.
Sampling rate
Kilohertz, abbreviated as kHz, is a unit of frequency, or cycles per second.
This statistic in digital audio refers to the number of data chunks required each second to digitally represent an analogue sound. The sample rate or sampling frequency refers to these data units.
What is Sampling rate ?The sample rate is the number of sound samples that are taken per second to represent an event digitally while creating audio for computers or telecommunication.
The digital representation of the sound can be more accurate the more samples captured per second.The ideal sample rate to choose is 44.1 kHz for the majority of music applications. When producing music or other audio for video, 48 kHz is typical.Learn more about Sampling rate here:
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PLEASE ANSWER THIS ASAP!!!
Oliver was listening to music streaming from a cell phone. The sound was clear with no interference until he entered a garage and went down to the 4th level for parking. Then, the music stopped playing entirely.
Is the music signal most likely an analog or digital signal, and how do you know?
(Choice A)
Analog because the music was always clear until it stopped playing.
(Choice B)
Digital because the music was always clear until it stopped playing.
(Choice C)
Analog because the signal reaches into the parking garage.
(Choice D)
Digital because the signal reaches into the parking garage.
Answer:
I guess B
Explanation:
Because it stop by it self so that is digital
At a certain point in space there is a potential of 400 v. what is the potential energy of a 2-μc charge at that point in space? group of answer choices'
The potential energy of a 2-μc charge at that point in space is [tex]8*10^{-4}[/tex] joules.
Given,
V=400v, q=2-μc=2*[tex]10^{-6}[/tex],
U(potential energy)=V*q=400*2*[tex]10^{-6}[/tex]= [tex]8*10^{-4}[/tex] joules.
Potential energyThe energy that an item retains due to its position in relation to other objects, internal tensions, electric charge, or other reasons is known as potential energy in physics. The gravitational potential energy of an object is based on its mass and the distance from the centre of mass of another object. Other common types of potential energy include the elastic potential energy of an extended spring and the electric potential energy of an electric charge in an electric field. The joule, denoted by the sign J, is the SI's definition of an energy unit.
The vectors that are described as gradients of a particular scalar function known as potential can be used to represent these forces, also known as conservative forces, at any location in space.
At a certain point in space there is a potential of 400 v. what is the potential energy of a 2-μc charge at that point in space? group of answer choices'
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Describe how an oil spill could affect the aquaculture and fishing industries.
is position a base or derived quantity?
Position is measured in meters (m), so it is a base quantity.
What is base quantity?A base or fundamental quantity is a physical quantity, in which other quantities are derived from.
Example of fundamental quantities;
MassLength (position)TimeTemperatureAmount of substanceWhat is a derived quantity?Derived quantities are those quantities obtained or expressed from fundamental quantities.
Example of derived quantities;
SpeedAccelerationVolumeAreaDensity, etcThus, we can conclude that position measured in meters (m) is a base quantity.
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When the magnetic flux through a loop changes, which is always true about the induced current?
The magnetic flux linked with the conductor will always changes is true for the induced current, if it produces a magnetic field that opposes the change in the existing magnetic field.
To find the answer, we have to know more about the Electromagnetic induction.
What is Faraday's law of Electromagnetic induction?According to Faraday's law of EMI, an electromotive force is always created when a conductor is exposed to a fluctuating magnetic field.Induced current is the term used to describe the current that results from a closed conductor circuit.The rate of change of the flux linkage determines the amount of induced emf in a coil. The polarity of the induced emf is such that, according to Lenz's law, it tends to produce a current that opposes the change in magnetic flux that caused it.Thus, we can conclude that, the magnetic flux linked with the conductor will always changes is true for the induced current, if it produces a magnetic field that opposes the change in the existing magnetic field.
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The aspect of lighting that refers to the relative intensity of illumination is called________.
A Final statement or concluding statement
The aspect of lighting that refers to the relative intensity of illumination is called Lightning Quality.
What is Luminous intensity?Based on the luminosity function, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a specific direction per unit solid angle.
Photometry is the science of measuring visible light as it is experienced by human eyes.
The human eye can only sense light in the visible range and is sensitive to different wavelengths of light within that spectrum.
The eye is most sensitive to greenish-yellow light at 555 nm when it is acclimated for bright settings (photopic vision).
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If a disk rolls smoothly down a ramp, how is its acceleration related to its angular acceleration?
If a disk rolls smoothly down a ramp, the acceleration is related to its angular acceleration in such a way that It is equal to the product of the angular acceleration to the radius of the disk.
Linear acceleration is defined as the uniform acceleration caused by a moving body in a straight line. There are three equations that are important in linear acceleration depending upon the parameters like initial and final velocity, displacement, time and acceleration.
Angular Acceleration is defined as the time rate of change of angular velocity. It is usually expressed in radians per second per second. Thus, α = d ω/ d t. The angular acceleration is also known as rotational acceleration.
Its equal to the product of the angular acceleration to the radius of the disk.
This equation mean that linear acceleration and angular acceleration are directly proportional. The greater the angular acceleration is, the larger the linear (tangential) acceleration is, and vice versa.
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When energy is transferred between earth's system, some energy is lost to the surroundings in the form of _____________________. (select all that apply)
When energy is transferred between earth's system, some energy is lost to the surroundings in the form of
-light
-movement
-heat
-vibration
What is energy in earth's system?Only a few factors account for the majority of the energy in the Earth system: solar energy, gravity, radioactive decay, and the rotation of the Earth. Many surface processes, including winds, currents, the hydrologic cycle, and the entire climate system, are powered by solar energy. Rivers and other materials flow downhill due to gravity, which also causes tides (due to the Moon's gravitational pull). The Earth's interior is heated by radioactive decay, while air and water currents are influenced by the forces of rotation.
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The hockey player is moving at a speed of 9. 5 m/s. if it takes him 2 seconds to come to a stop under constant acceleration, how far does he travel while stopping?
Answer:
[tex]9.5\; {\rm m}[/tex].
Explanation:
Let [tex]u[/tex] and [tex]v[/tex] denote the velocity of this hockey player before and after stopping, respectively. The question states that [tex]u = 9.5\; {\rm m\cdot s^{-1}}[/tex] and implies that [tex]v = 0\; {\rm m\cdot s^{-1}[/tex] since the hockey player has come to a stop.
The duration of this acceleration is [tex]t = 2\; {\rm s}[/tex].
Since the acceleration of this hockey player was constant, SUVAT equation would apply. In particular, the SUVAT equation [tex]x = (1/2)\, (v + u) \, (t)[/tex] gives the displacement [tex]x[/tex] of this hockey player during that [tex]2\; {\rm s}[/tex] of acceleration:
[tex]\begin{aligned} x &= \frac{1}{2}\, (9.5\; {\rm m\cdot s^{-1}} + 0\; {\rm m\cdot s^{-1}})\, (2\; {\rm s}) = 9.5\; {\rm m} \end{aligned}[/tex].
In other words, this hockey player would have travelled [tex]9.5\; {\rm m}[/tex] while stopping.
If the partial pressure of nitrogen in the human body is approximately 593 mm hg at sea level, the partial pressure of nitrogen cannot be ______________ in a scuba diver that is at a depth of 30 feet.
If the partial pressure of nitrogen in the human body is approximately 593 mm hg at sea level, the partial pressure of nitrogen cannot be 760mm Hg in a scuba diver that is at a depth of 30 feet.
Nitrogen narcosis :
The partial pressure of nitrogen increases with pressure, which produces a narcotic effect. Nitrogen narcosis affects both scuba divers and free divers. It causes depression of the central nervous system, which leads to feelings of euphoria, disorientation and irrational behavior. Divers need to consider absorption rates of different gases in order to avoid conditions such as nitrogen narcosis, and decompression sickness.
What is the partial pressure of the nitrogen?
Therefore, at sea level, where atmospheric pressure is known to be 760 mm Hg, the partial pressures of the various gases can be estimated to have partial pressures of approximately 593 mm Hg for nitrogen, 160 mm Hg for oxygen, and 7.6 mm Hg for argon.
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What is a stele?
a) carved stone slab used for voting
b) carved stone slab symbolizing the creation of humankind
c) carved stone slab used to mark graves or historical events
Stele is a c) carved stone slab used to mark graves or historical events
It is a stone or wooden slab, generally taller than it is wide, erected in the ancient world as a monument. The surface of the stele often has text, ornamentation, or both. Stela, also spelled stele , plural stelae, standing stone slab used in the ancient world primarily as a grave marker but also for dedication, commemoration, and demarcation.
Stelae were created for many reasons. Grave stelae were used for funerary or commemorative purposes. Stelae as slabs of stone would also be used as ancient Greek and Roman government notices or as boundary markers to mark borders or property lines. Stelae were occasionally erected as memorials to battles.
Today, forms of stele are still used, most often in war monuments.
hence , stele used for carved stone slab used to mark graves or to commemorate historical events.
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An fm radio station broadcasts at 98. 6 mhz. What is the wavelength of the radiowaves?.
The wavelength of the radio waves is 3.04 cm.
Calculation:λf = c
λ = c/f
where,
λ = wavelength
c = speed of light
f = frequency
Given,
f = 98.6 MHz = 98.6 × 10⁶
c = 3 × 10⁸
To find,
λ =?
Put the values in the formula,
λ = c/f
λ = 3 × 10⁸/98.6 × 10⁶
= 0.0304 × 10² m
= 3.04 cm
Therefore, the wavelength of the radio waves is 3.04 cm.
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A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg
initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the blue train?
A. 90 kgm/s
B. 200 kgm/s
C. 110 kgm/s
D. 20 kgm/s
Answer:
C
Explanation:
Use conservation of momentum
Momentum before collision = mv = 50 (4) = 200 kg-m/s
AFTER collision
30 * 3 + Blue momentum = 200
blue momentum = 110 kg-m/s
A car accelerates from west to east. In which direction is the force it applies on the road? What is the direction of the force applied by the road on the car?
Answer:
The car applies a force in the opposite direction it is moving to. That is; from east to west.
Explanation:
This obeys Newtons third law of motion.