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Related Questions
How is the size of a planet related to the thickness of its atmosphere?
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Why does the sound of something moving away from you seem to change to a lower and lower pitch?
A) As the source moves away, the increased distance creates more interference; so the pitch drops.
B) As the source moves away, the frequency of the sound waves is being compressed, so the pitch drops.
C) As the source moves away, the sound waves speed up to reach the observer; this causes the pitch to drop.
D) As the source moves away, the sound waves stretches out relative to the person standing still; so the pitch drops.
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to change to a lower and lower pitch. It simply has a lower pitch
than the sound that was actually emitted. HOW MUCH lower depends
on the speed with which the source is moving away from you.
As the source moves away, the sound waves "stretch out" relative to
the person standing still; so the pitch drops. (D)
By the way ... it doesn't matter whether it's the source or the listener moving away, or the listener or the source standing still. As long as
the distance between them is increasing, the listener hears a sound
with a pitch that's lower than it should be.
Which color in the visible spectrum has the highest frequency?
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The color in the visible spectrum that has the highest frequency is the violet.
Violet waves have the most energy of the visible spectrum.
Remember: c=fλ
Therefore: f=c/λ
Here c is the speed of light in a vacuum.
So:
As wavelength decreases, frequency increases and, as E=hf, where h is constant (Planck's constant), so does the energy that the waves carry. Waves with a short wavelength have the most energy.
Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that.Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
Violet is the color in the visible spectrum that has the highest frequency. (option b)
The visible spectrum consists of various colors that we can see with our eyes, ranging from red to violet. Each color corresponds to a specific wavelength of light. Wavelength is the distance between consecutive peaks (or troughs) of a wave. The frequency of a wave, on the other hand, refers to how many waves pass a particular point in space per unit of time.
The relationship between frequency (f), wavelength (λ), and the speed of light (c) can be described by the equation:
c = f × λ
where c is the speed of light in a vacuum (approximately 3 × 10^8 meters per second), f is the frequency, and λ is the wavelength.
As per this equation, the higher the frequency of light, the shorter the wavelength. Conversely, the lower the frequency, the longer the wavelength.
Hence the correct option is (b),
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Complete Question:
Which color in the visible spectrum has the highest frequency?
a) Blue
b) Violet
c) Green
d) Red
What is the escape speed of an electron launched from the surface of a 1.1-cm-diameter glass sphere that has been charged to 8.0 nc ?
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The calculation of escape speed from a charged glass sphere involves principles from electrostatics and classical mechanics, requiring an understanding of how kinetic and electric potential energies equate as an electron moves away from the sphere. Unfortunately, without detailed formulae specific to this electrostatic scenario, a precise answer cannot be provided here.
Explanation:The question involves calculating the escape speed of an electron from a charged glass sphere, which is a task that falls under the domain of electrostatics and classical mechanics in physics. Generally, the escape speed from a celestial body like Earth is determined by its mass and the gravitational forces involved. However, in this electrostatic context, the key forces are electrical, not gravitational. The escape speed in this scenario would depend on the electric potential energy and kinetic energy equivalence. Given the unique nature of the question which combines concepts from electrostatics with classical escape velocity calculations, a straightforward formula application from physics textbooks might not directly apply without considering the electric force on the electron due to the charged sphere. Nonetheless, the principle remains that to calculate escape speed, one would need to equate the kinetic energy of the electron with the work done against the electric force as it moves to infinity (where the electrical potential energy becomes zero).
The escape speed of an electron from the surface of a charged sphere can be found using the formula, yielding approximately 162 meters per second. This is derived considering the charge of the sphere, its radius, and Coulomb's constant.
To find the escape speed of an electron from a charged sphere, you need to use the concept of electric potential energy and kinetic energy. The escape speed, vesc, is given by:
vesc = √((2 * k * Q) / r)where Q is the charge of the sphere, r is the radius of the sphere, and k is Coulomb's constant (k = 8.99 × [tex]10^9[/tex] N [tex]m^2[/tex]/[tex]C^2[/tex]).
Given:
Diameter of the sphere = 1.1 cm → radius, r = 0.55 cm = 0.0055 mCharge of the sphere, Q = 8.0 nC = 8.0 × [tex]10^{-9}[/tex] CUsing the formula:
vesc = √((2 * 8.99 × [tex]10^9[/tex] N [tex]m^2[/tex]/[tex]C^2[/tex] * 8.0 × [tex]10^{-9}[/tex] C) / 0.0055 m)vesc = √((1.4384 × [tex]10^2[/tex] ) / 0.0055 m)vesc ≈ √(2.6145 × [tex]10^4[/tex])vesc ≈ 162 m/sThus, the escape speed of the electron from the surface of the charged sphere is approximately 162 meters per second.
An electron has kinetic energy 3.00 ev. find its wavelength.
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[tex]1 eV = 1.6 \cdot 10^{-19} J[/tex]
3 eV corresponds to
[tex]K=3 eV = 3 \cdot 1.6 \cdot 10^{-19}J=4.8 \cdot 10^{-19} J[/tex]
The kinetic energy of an electron is related to its momentum by the formula
[tex]K= \frac{p^2}{2m} [/tex]
where p is the electron's momentum, while m is its mass. Re-arranging the formula, we find
[tex]p= \sqrt{2Km}= \sqrt{2 (4.8 \cdot 10^{-19}J)(9.1 \cdot 10^{-31} kg)}=9.35 \cdot 10^{-25} kg m/s [/tex]
And then we can use De Broglie relationship to find its wavelength:
[tex]\lambda= \frac{h}{p}= \frac{6.6 \cdot 10^{-34}Js}{9.35 \cdot 10^{-25} kg m/s}=7.06 \cdot 10^{-10} m [/tex]
A mechanical high-speed bat is flying along a path perpendicular to a wall. it emits a sound with a frequency f0 . the night is clear and the air is still. let the speed of sound waves in the still air be vs . the bat hears a sound wave reflected from the wall with a frequency fnew . from this information one can determine the speed vbat at which the bat is flying. install a detector at the wall. 0 bat f v what is the detected frequency? 1. f1 = vs + vbat vs f0 2. f1 = vs vs − vbat f0 3. f1 = vs vs + vbat f0 4. f1 = vs + vbat vs − vbat f0 5. f1 = 2 vs vs − vbat f0 6. f1 = vs − vbat vs f0 7. f1 = vs − vbat vs + vbat f0 8. f1 = f0 9. f1 = 2 vs vs + vbat f0
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The detected frequency f1 can be calculated using the Doppler effect formula, which leads to the conclusion that option 3 is the correct answer (f1 = vs / (vs + vbat) * f0). This equation allows to determine the actual speed of the bat.
Explanation:This question can be addressed using the Doppler effect principle, which describes how the frequency of sound changes for an observer moving in relation to a sound source.
Given that the bat is moving perpendicular to the wall with the speed vbat and since the night is clear and air is still (meaning no additional obstructions in the sound path), the detected frequency f1 can be calculated using the Doppler effect formula:
f1 = vs / (vs + vbat) * f0.
Therefore, option 3 is the correct answer. To measure the actual speed of the bat, you can install a detector on the wall and make use of the fact that frequencies f0 and f1 are known and the speed of sound vs is also known or can be easily determined from the conditions (e.g., air temperature).
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The question pertains to the Doppler Effect, and the formula for the detected frequency of the bat's echo, considering the bat's speed, is f1 = vs / (vs + vbat) * f0.
Explanation:The question deals with the concept of the Doppler Effect in physics. This effect relates to the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. In this specific scenario, a mechanical bat emits a sound with a frequency of f0 and moves towards a wall. The sound wave reflects off the wall and returns to the bat. The frequency that the bat hears is affected by its own velocity (vbat) and the speed of sound (vs) in the air around it.
Based on the formulas listed, the correct one is number 3, f1 = vs / (vs + vbat) * f0, based on the standard equation for Doppler Effect when the observer (in this case, the bat) is moving towards a stationary source (in this case, the reflected sound wave). When this happens, the observed frequency increases, since the bat is chasing the sound wave that it emitted.
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a brick is suspended above the ground at a height of 6.6 m. it has a mass of 5.3 kg. what is the potential energy of the brick
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E(p) = mgh
(Mass x gravity x height)
Therefore energy = (5.3)(9.8)(6.6)
= 342.8 J
How did I get 9.8?
9.8 is the constant for gravity
A teacher pushed a 98 newton desk across a floor for a distance of 5 meter he exerted a horizontal force of 20 newton for four seconds
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Solution:
The work done to move the desk across the floor is equal to
[tex]W=Fd[/tex]
where F is the horizontal force applied to move the desk, and d is the distance covered by the desk. If we use F=20 N and d=5 m, we find the work done:
[tex]W=Fd=(20 N)(5 m)=100 J[/tex]
The work done by the teacher in pushing the desk is calculated by multiplying the force exerted (20 newtons) by the distance covered (5 meters), which gives a total work done of 100 joules.
Explanation:To calculate the amount of work done in moving an object, we use the formula: Work = Force x Distance.
In this case, the teacher exerted a force of 20 newtons across a distance of 5 meters. Therefore the work is calculated as: 20N x 5m = 100 joules.
To summarise, the teacher did 100 joules of work on the desk when pushing it through a 5 meter distance.
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The complete question is here:
A teacher pushed a 98 newton desk across a floor for a distance of 5 meters. She exerted a horizontal force
of 20 newtons. How much work was done?
In the absence of air resistance and friction, what will happen to the velocity of an object going at 20 m/s E?
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In fact, Newton's second law states that the resultant of the forces acting on an object is equal to the product between the mass and the acceleration of the object:
[tex]\sum F = ma[/tex]
therefore, if there are no forces acting on the object, the term on the left is zero, and the acceleration of the object is zero as well. This means that the object will continue its motion with constant speed, and in the same direction.
how have increased carbon dioxide levels and temperatures affected living organisms
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Answer:
Carbon dioxide is a greenhouse gas that traps heat on eath increasing the global average temperature. This for example is melting the arctic ice faster and more than usual. This is leading many arctic species to loose their habitats.
Answer:
Carbon dioxide is a greenhouse gas that traps heat on eath increasing the global average temperature. This for example is melting the arctic ice faster and more than usual. This is leading many arctic species to loose their habitats
Explanation:
twas correct ed2022
A metallic object is given a positive charge by the process of induction, as illustrated in Figure 18.8. (a) Does the mass of the object increase, decrease, or remain the same? Why? (b) What happens to the mass of the object if it is given a negative charge by induction? Explain.
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b. During the induction process, electrons are drawn from the earth to the object, so that the metal object becomes negative. The mass of the object increases by an amount equal to the mass of "excess" electrons dragged onto the object.
Light of wavelength 520 nm passes through a slit of width 0.220 mm. (a) the width of the central maximum on a screen is 8.30 mm. how far is the screen from the slit?
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[tex]y_n= \frac{n \lambda D}{a}[/tex] (1)
where
n is the order of the minimum
y is the displacement of the nth-minimum from the center of the diffraction pattern
[tex]\lambda[/tex] is the light's wavelength
D is the distance of the screen from the slit
a is the width of the slit
In our problem,
[tex]\lambda=520 nm=5.2 \cdot 10^{-7} m[/tex]
[tex]a=0.22 mm=0.22 \cdot 10^{-3} m[/tex]
while the width of the central maximum on the screen corresponds to twice the distance of the first minimum from the center, and it is equal to
[tex]2 y_1 = 8.30 mm=8.3 \cdot 10^{-3} m[/tex]
Therefore the distance of the first minimum from the center is
[tex]y_1 = \frac{8.3 \cdot 10^{-3} m}{2}=4.15 \cdot 10^{-3} m[/tex]
If we plug these numbers into eq.(1), we can find D, the distance of the screen from the slit:
[tex]D= \frac{y_1 a}{ 1 \lambda }= \frac{(4.15 \cdot 10^{-3} m)(0.22 \cdot 10^{-3} m)}{(1)(5.2 \cdot 10^{-7} m)}= 1.76 m[/tex]
If a spaceship of proper length 40 m is measured to have a length 30 m, how fast is it moving?
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[tex]L=L_0 \sqrt{1- \frac{v^2}{c^2} } [/tex]
where
L is the measured length
L0 is the proper length
v is the speed of the object
c is the speed of light
In our problem, the measured length is 30 m while the proper length was 40 m, therefore if we re-arrange the equation we can calculate the speed of the spaceship:
[tex]v=c \sqrt{1- (\frac{L}{L_0})^2 }=(3 \cdot 10^8 m/s ) \sqrt{1-( \frac{30m}{40 m} )^2}=1.98 \cdot 10^8 m/s [/tex]
a star with an original mass of 8 to 25 solar masses will ultimately become a ?
a) red giant
b)white dwarf
c) neutron star
d)main sequence star
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Choose the statement about nuclear fusion that is always correct?
A) Very little energy is released in fusion processes.
B) Due to its instability, 56Fe readily undergoes fusion.
C) Nuclear fusion is an energetically favorable process for lighter atoms.
D) In fusion reactions, a proton and an electron combine to create a neutron.
EDIT: THE ANSWER IS (C)
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Nuclear fusion is an energetically favorable process for lighter atoms.
The proportion of hydrogen which is converted to energy in nuclear fusion is 0.68 percent or 0.7 percent.
Nuclear fusion produces energy which is from matter and nuclear fusion produces matter from energy.
The nuclear energy which splits large atom into small ones and then gives out energy.
Some matter is being lost and being converted to energy by Einstein's Δm×C².
Nuclear energy fusion makes larger elements and takes smaller elements.
For fusion to occur then energy must be converted to mass.
Nuclear fusion is an energetically favorable process for lighter atoms.
Emily finds a rock with crystals 2 cm large. Her rock _____.
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According to the Big Bang theory, _____. A)Earth's moon was created from a collision with MarsB) the universe was created from a cosmic explosion C) our solar system is shrinking and will eventually collapse into the sun D) in about 5 billion years, the sun will swell and engulf the inner planets
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The answer is B. the universe was created from a cosmic explosion.
It is called the Big Bang Theory, but actually there was no REAL explosion. What happened was the universe expanded from a really dense and hot superforce. There were no stars, atoms, and the like. This point was called "singularity,"- a mass that contained all the mass, and the space-time of the universe.
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A major consequence of ozone depletion is that
A. certain parts of the earth will become over-vegetated.
B. solar energy will become ineffective.
C. more harmful UV rays will reach the earth's surface.
D. acid rain will increase.
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A major consequence of ozone depletion is C. more harmful UV rays will reach the earth's surface due to ozone depletion. The correct option is C.
A major consequence of ozone depletion is that more harmful ultraviolet (UV) rays will reach the Earth's surface (Option C). Ozone depletion in the stratosphere allows increased penetration of UV-B and UV-A radiation, which can have adverse effects on human health, ecosystems, and the environment. Excessive UV exposure can lead to skin cancer, cataracts, and other health issues in humans.
It can also harm marine life, crops, and forests, disrupting ecosystems and food chains. Stratospheric ozone depletion does not directly cause over-vegetation (Option A), render solar energy ineffective (Option B), or increase acid rain (Option D). Addressing ozone depletion through international agreements like the Montreal Protocol is crucial to mitigate its harmful impacts on the planet and its inhabitants.
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what is showed in the diagram /Users/jacinta/Desktop/NNNNNN.png
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The cathode ray tube uses which of the following to direct electron beams...
A) electric fields
B) bar magnets
C) magnetic fields
D) gravitational field
Also...what did the cathode ray tube allow J.J. Thomson to do?
A) study static charges in electric fields
B) study and discover the positively charged nucleus
C) study moving electrons in the presence of a magnetic field
D) study the shapes of magnetic fields around solenoids.
Thanks! :)
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Therefore, the answer is C. MAGNETIC FIELD
J.J. Thompson discovered the electron, which a constituent of the subatomic particles under the cathode ray tube experiment.
Therefore, the answer is C. STUDY OF MOVING ELECTRONS IN THE PRESENCE OF MAGNETIC FIELD.
Conventionally, the field strength around a charged object is the direction of the force acting on a .
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Answer:
Field Strength:Any charged body has the capacity to effect any test charge that comes inside its field or region. It can be also defined as,
"The total amount or magnitude of force,F or intensity felt by any unit test charge when it enters an electromagnetic or electric field."
For an electric field its unit will be, volt per meter or simply V/m.Explanation:
A unit test charge inside an electric field:
When a unit test charge enters a given parameters or area set by the charged particle then it will surely experience a force,F equal to the magnitude of that charge body and it will be different as it continues to move closer or far inside the field.
As, we have, "E=F/q",(where "F" is the field strength and "q" is the unit test charge placed inside the field).A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy
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The complete sentence is:
"A person on earth would weigh a lot more on the sun due to increased gravity"
In fact, the weight of a person is given by
[tex]F=mg[/tex]
where m is the mass of the person, while g is the gravitational acceleration. While the mass m of the person does not change moving from Earth to the Sun, the gravitational acceleration g does depend on the mass of the planet/star. In fact:
[tex]g= \frac{GM}{r^2} [/tex]
where G is the gravitational constant, M is the mass of the planet/star, r is its radius. Due to the fact that the mass of the sun is huge compared to the Earth's mass, the gravitational acceleration at the Sun's surface is much more than the gravitational acceleration at Earth's surface, so a person would weigh much more on the Sun than on Earth.
(by comparison, the value of g at the Sun's surface is approximately 28 times the value of g at Earth's surface).
What set of simple machines would be needed to create the complex machine shown here?
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How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.4 μC?
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electrons corresponding to this charge is
N = (-2.4 x 10^-6 C)/(-1.60 x 10^-19 C)
= 1.5 x 10^13 electrons
Therefore 1.5 x 10^13 electrons need to be removed from the neutral silver dollar.
The total number of electrons removed from the neutral silver dollar is [tex]1.5 \times 10^{13}[/tex] electrons.
Charge and ElectronA charge can be defined as a property of any matter that causes it to experience a force when it's placed in an electric or magnetic field. The electron is negatively charged. The value of an electron charge is [tex]1.6\times 10^{-19}\;\rm C[/tex]
Given that the neutral silver dollar has a charge [tex]q = +2.4 \mu \rm C[/tex] .
The charge can be given as,
[tex]q=ne[/tex]
Where n is the number of electrons. Thus,
[tex]n =\dfrac { q}{e}[/tex]
[tex]n = \dfrac {+2.4 \times 10 ^{-6}}{1.6\times 10^{-19}}[/tex]
[tex]n = 1.5 \times 10^{13}[/tex]
Hence we can conclude that the total number of electrons removed from the neutral silver dollar is [tex]1.5 \times 10^{13}[/tex] electrons.
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A straight 1.0 m long wire is carrying a current. the wire is placed perpendicular to a magnetic field of strength 0.20 t. if the wire experiences a force of 0.60 n, what is the current in the wire?
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[tex]F=ILB[/tex]
where
I is the current in the wire
L is the wire length
B is the intensity of the magnetic field
In our problem, the length of the wire is L=1.0 m, the magnetic field strength is B=0.20 T and the force exerted on the wire is F=0.60 N. If we re-arrange the equation and we plug these numbers into it, we find the current in the wire:
[tex]I= \frac{F}{LB}= \frac{0.60 N}{(1.0 m)(0.20 T)}=3 A [/tex]
What would the potential of a standard hydrogen electrode (s.h.e.) be under the given conditions? [h+]=0.70 mph2=2.4 atmt=298 k?
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T is for temperature which is 298K
Faraday constant value is 96500C/mol
n is the number of electrons which are transferred in the reaction.
Ecell = E₀cell - RT/nFiN [cathode]/[anode]
Ecell = E₀cell - RT/nF In [PH₂]/[H⁺]²
Ecell = 0.00-8.314 JK⁻¹ mol⁻¹ × 298k/ 2× 96500C/mol In [2.4atm]/ 0.70]²
Ecell = 0.00 - 0.0129 In (2.59)
Ecell = 0.00 - 0.0129 × 0.951
Ecell = -0.0122V
∴Ecell is = -o.0122v
Assume that you have two objects, one with a mass of 6 kg and the other with a mass of 17 kg, each with a charge of −0.027 c and separated by a distance of 3 m. what is the electric force that these objects exert on one another? answer in units of n. what is the gravitational force between them? answer in units of n.
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Electric force is the attractive or reflective force of interception between two charged object.
A) The electric force that these objects exert on one another is [tex]7.28\times 10^5[/tex] N.B) The gravitational force between them is [tex]7.56\times10^{-10}[/tex] N.Given information-
The mass of first object is 6 kg.
The mass of second object is 17 kg.
The charge on both the object is 0.027 C.
The distance between the two object is 3 m.
What is electric force?Electric force is the attractive or reflective force of interception between two charged object. It can be calculated using the Coulomb's law as,
[tex]F=k_e\dfrac{q_1\q_2}{r^2}[/tex]
Here, [tex]q[/tex] is the charge on the object and [tex]r[/tex] is the distance between the objects. [tex]k_e[/tex] is coulombs constant [tex](8.987\times 10^9)[/tex] N-m squared per C squared.
A) Electric force that these objects exert on one another-Put the values in above formula to find out the electric force between given objects-
[tex]F=8.987\times10^9\dfrac{(-0.027)\times(-0.027)}{3^2}\\F=7.28\times 10^5[/tex]
Hence the electric force that these objects exert on one another is [tex]7.28\times 10^5[/tex] N.
B) Gravitational force between them-Gravitational force between two object with mass [tex]m_1[/tex] and [tex]m2[/tex] can be given as,
[tex]F_g=G\dfrac{m_1m_2}{r^2}[/tex]
Here [tex]G=6.67\times 10^{-11}[/tex] N-m squared per kg squared.
Put the values,
[tex]F_g=6.67\times 10^{-11}\times\dfrac{6\times17}{3^2}\\F_g=7.56\times10^{-10}[/tex]
Thus, the gravitational force between them is [tex]7.56\times10^{-10}[/tex] N.
Hence,
The electric force that these objects exert on one another is [tex]7.28\times 10^5[/tex] N.The gravitational force between them is [tex]7.56\times10^{-10}[/tex] N.Learn more about the electric force here;
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Final answer:
The electric force and gravitational force between two objects can be calculated using specific laws involving charge, mass, and distance.
Explanation:
The electric force between two objects can be calculated using Coulomb's Law, which states that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
The gravitational force between the two objects can be determined using Newton's Law of Universal Gravitation, where the force is proportional to the product of the masses and inversely proportional to the square of the distance between them.
A hot water heater is operated by using solar power. if the solar collector has an area of 5.3 m2 , and the power delivered by sunlight is 995 w/m2 , how long will it take to increase the temperature of 1 m3 of water from 20 ◦c to 65 ◦c? the specific heat of water is 4186 j/kg · ◦ c and the density of water is 1000 kg/m3 . answer in units of h.
Answers
Heat Q in joules absorbed in t hours = Heat used to heat water. That is,
5273.5*t = mCΔT; where mass = volume*density = 1*1000 = 1000 kg
Therefore;
5273.5t = 1000*4186*(65-20) = 188370000
t = 188370000/5273.5 = 35720.11 seconds = 35720.11/(60*60) hours ≈ 9.92 hours.
It will take approximately 9.92 hours.
A vertical polarizing filter is used on the lens of a camera. Which waves do not strike the lens?
Answers
What is the acceleration of a skateboarder of mass 46 kg who is being pushed forward with a force 120N?
Answers
120 N = 46 kg * acceleration
120 kg-m/s^2 = 46 kg * acceleration (in m/s^2)
acceleration = 120/46 = 2.61 m/s^2
Answer:
The acceleration of this skateboarder is 2.61 m/s^2.
Explanation:
120=46*a
/46 /46
2.61 m/s^2=a