Answer:
B) Its frequency
Explanation:
The pitch of sound heard depends on its frequency of the sound wave. Frequency refers to how fast the sound wave is oscillating. A high frequency sound wave has a high pitch while a low frequency sound wave has a low pitch.The faster the sound wave oscillates the higher the pitch. For instance, a guitar with a big heavy string will vibrate slowly and thus create a low pitch.When a guitar is tuned to adjust its pitch, B) its frequency is changed.
The frequency determines how high or low we perceive the sound (or pitch) to be. This adjustment is achieved by tightening or loosening the tension on the strings, which alters the rate at which the string vibrates.
Frequency is the number of vibrations per second of the string and is measured in Hertz (Hz). Higher tension on the string increases the vibration rate, leading to a higher pitch, while lower tension decreases the vibration rate, resulting in a lower pitch.
So, the frequency is key in changing the pitch of the guitar string, not the wavelength, amplitude, or linear density. The correct answer is B.
Please help, I do not understand this question... ¯\_(ツ)_/¯
We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars?
The answer is through light.
Light is unique it carries information it has no mass and it is insanely fast.
But what is light?
You can imagine it as a stream of photons (elementary particles) traveling from its source to surface of an object with a speed of light where they bounce of your eye. That very moment the information of a single photon in a form of energy is transmitted to your eyes and later on to your brain which processes the gathered information and constructs an image.
When you turn on the light you know that all the photons are coming from it the same thing is with nonanthropogenic light (natural light) we get about 99% from the sun and about 1% from the moon at night.
In the core of our sun elements are fused to make up heavier elements in this process energy is released (E=mc^2, where E is energy, m mass of a single atom fused inside star and c^2 the square of speed of light) in a form of photons and the type of photon (its frequency) determines if it will be visible to our eye and also determines the type of luminosity of stars.
Also if you were to track every single bit of information carried by any photon any time you would unravel the unfolding of the universe from the big bang to today.
Suppose that you are standing on a train accelerating at 0.39g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
Static friction is the friction that exist between a stationary object and the surface on which it is resting. Coefficient of friction tells us how strongly the two surfaces grip each other. Static friction and coefficient of friction are related to each other by the relation;
Fs=μsN
where,
Fs=Force of static friction
μs=Coefficient of friction
N=Normal force
Answer:
0.39
Explanation:
In order not to slide, you must have exactly the same acceleration of the train:
[tex]a=0.39 g[/tex]
where
g = 9.81 m/s^2
There is only one force acting on you: the static frictional force that "pulls" you forward, and it is given by
[tex]F_s = \mu_s mg[/tex]
According to Newton's second law, the net force acting on you (so, the frictional force) must be equal to your mass times the acceleration, so we have
[tex]F= ma = \mu_s mg[/tex]
from which we find
[tex]\mu_s = \frac{a}{g}=\frac{0.39 g}{g}=0.39[/tex]
so, the minimum coefficient of static friction must be 0.39.
The minimum coefficient of static friction required to prevent slipping on a train accelerating at 0.39g must be equal to or greater than 0.39.
Explanation:To calculate the minimum coefficient of static friction required to prevent you from sliding on a train accelerating at 0.39g (where g is the acceleration due to gravity), you need to understand the relationship between static friction (Fs) and the normal force (N). Let's denote the coefficient of static friction as μs. The maximum force of static friction (μsN) should be equal to or greater than the force needed to overcome the train's acceleration to avoid slipping.
Since the acceleration of the train is 0.39g, and g is 9.81 m/s² (the acceleration due to gravity), the force due to the train's acceleration can be expressed as 0.39 × your mass × g. Considering that your mass × g gives us the normal force (N), the equation to avoid slipping becomes:
Fs ≥ 0.39 × N
Substituting the force of static friction equation (Fs = μs × N), we get:
μs × N ≥ 0.39 × N
Since N appears on both sides of the inequality, they cancel each other out, and you are left with:
μs ≥ 0.39
This means the minimum coefficient of static friction must be 0.39 or greater to prevent sliding.
Which portion of the electromagnetic spectrum is used in a television
Radio waves are a type of electromagnetic radiation with wavelengths between 10 m to 10,000 m. In the electromagnetic spectrum this wavelength is longer than infrared light and therefore, it goes beyond the visible spectrum.
This type of electromagnetic waves is very well reflected in the ionosphere, the layer of the atmosphere through which they travel directly or using repeaters.
In addition, they are very useful to transport information, being important in telecommunications. They are used not only for conventional radio transmissions but also in mobile telephony and TV.
It should be noted that since radio signals have large wavelengths, they can be diffracted around certain obstacles, such as hills and mountain ranges, preventing the signal from reaching its destination.
A straight 2.20 m wire carries a typical household current of 1.50 A (in one direction) at a location where the earth's magnetic field is 0.550 gauss from south to north. Part A Find the direction of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from west to east. SubmitRequest Answer Part B Find the magnitude of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from west to east. F1 F 1 = nothing N SubmitRequest Answer Part C
A) Upward
In order to find the direction of the magnetic force on the wire, we can use the right-hand rule: the index finger, the middle finger and the thumb of the right hand must be placed all of them perpendicular to each other.
So we have:
- Index finger: direction of current in the wire (from west to east)
- Middle finger: direction of magnetic field (from south to north)
- Thumb: direction of the force --> so it will be upward
So, the force will point upward.
B) [tex]1.82\cdot 10^{-4}N[/tex]
The magnitude of the force exerted by the magnetic field on the wire is given by
[tex]F=ILB[/tex]
where
I = 1.50 A is the current in the wire
L = 2.20 m is the length of the wire
[tex]B=0.550 G = 0.55 \cdot 10^{-4}T[/tex]
Substituting into the equation, we find
[tex]F=(1.50 A)(2.20 m)(0.55 \cdot 10^{-4} T)=1.82\cdot 10^{-4}N[/tex]
Final answer:
The force exerted by the Earth's magnetic field on a wire carrying current from west to east is directed upwards. To determine the magnitude of the force, use the formula F = I × L × B × sin(θ) and calculate it to be approximately 0.1815 mN, where I represents current, L length, and B magnetic field.
Explanation:
The student's question involves finding the direction and magnitude of the force exerted by the Earth's magnetic field on a current-carrying wire oriented from west to east. To solve this, we use the right-hand rule for the direction and the formula F = I × L × B × sin(θ) for the magnitude.
Force Direction
Part A asks for the direction of the force. We apply the right-hand rule which indicates that if you point your thumb in the direction of current (from west to east, which is left to right) and your fingers in the direction of the magnetic field (from south to north, or bottom to top), your palm will face towards the direction of the force exerted on the wire. As the current flows from west to east and the Earth's magnetic field goes from south to north, the force on the wire will be directed upwards.
Force Magnitude
Part B asks for the magnitude of the force. The formula we use is F = I × L × B × sin(θ), where F is the force, I is the current (1.50 A), L is the length of the wire (2.20 m), B is the magnetic field, which should be converted from gauss to tesla (1 gauss = 1×10⁻⁴ tesla, so 0.550 gauss = 5.50×10⁻⁵ T), and θ is the angle between the wire and the magnetic field (90° here). With these values, we can calculate the force.
Let's calculate the force:
F = 1.50 A × 2.20 m × 5.50 × 10⁻⁵T × sin(90°)
F = 1.50 × 2.20 × 5.50 × 10⁻⁵ N
F = 0.1815 × 10⁻³ N
F ≈ 0.1815 mN
This is the sum of all the forces applied to an object. It is usually separated into a horizontal and vertical component.
Answer: Net Force, also is referred to as Resultant Force
Answer: The force is resultant force
Explanation:
The sum of all the forces applied to an object which usually separated into a horizontal and vertical component is its "resultant". This resultant force is a single force that act in terms of all other forces acting on an object or body combined together. It is always opposite the equilibrant in a system of forces.
To which layer can geologists apply the principle of faunal succession to determine the age of the layer?
A. Layer C
B. Layer A
C. Layer D
D. Layer B
Answer:
Layer C
Explanation:
The Principle of faunal succession also is the study of fossils
Their for making the answer A
Which one of the following statements concerning spherical mirrors is correct?A. Only a convex mirror can produce an enlarged image.
B. Both concave and convex mirrors can produce an enlarged image.
C. Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature.
D. Only a concave mirror can produce an enlarged image, provided the object distance is greater than teh radius of hte curvature.
C bc read the question
Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature is correct about spherical mirrors.
What are the characteristics of spherical mirrors?A spherical mirror is a mirror whose reflecting surface is part of a hollow sphere of glass. The spherical mirrors are of two types: concave mirrors and convex mirrors.
A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
Some applications of convex mirror are sunglasses, rear view mirrors, shaving mirror,etc. Some applications of concave mirrors are reflectors, converging of light, solar cooker etc.
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A train travels 50 kilometers in 4 hours, and then 74 kilometers in 2 hours. What is its average speed?
Answer:
37.65
Explanation:
50/4 + 74/2
If a train travels 50 kilometers in 4 hours, and then 74 kilometers in 2 hours its average speed is 24.75 km / hr.
Explanation:
Speed is related to the ratio of distance and time. Speed = Distance / time.
Speed of the first train = 50 / 4 = 12.5 km / hr
Speed of the second train = 74 / 2 = 3 7 km / hr
Average speed = (12.5 + 3 7 ) / 2 = 24.75 km / hr
So the average speed of the train is 24.75 km / hr.
What is the difference between transverse and longitudinal waves? Transverse waves always have greater frequencies than do longitudinal waves. Transverse waves always travel at smaller speeds than do longitudinal waves. In a transverse wave the disturbance always occurs perpendicular to the direction in which the wave travels, whereas in a longitudinal wave the disturbance always occurs parallel to the line of travel of the wave. In a transverse wave the disturbance always occurs parallel to the line of travel of the wave, whereas in a longitudinal wave the disturbance always occurs perpendicular to the direction in which the wave travels. Transverse waves always carry more energy than do longitudinal waves.
Answer:
A
Explanation:
which actions most likely cause the domains within a material to lose their alignment and become more randomized
answer:
heating the material
placing the material in a magnetic field of opposite polarity
hitting the material
Answer: heating, placing in a strong magnetic field, Placing in an electric field.
Explanation: Placing the material in an electric field.
Heating the material. Raising the temperature of the material.
Place the material in a magnetic field that is basically of opposite polarity.
Physically hitting of the material.
Red, blue, and green are called a __ __ __ __ __ __ __ primary colors because when they are added together, they form all of the colors of the spectrum.
Answer: Additive
Additive primary colors are blue red and green
Red, blue and green are called Additive primary colors which is known as colours of spectrum.
Explanation:
A set of colors that are joined to produce some useful colors are known as Primary colors. Red, blue and green colors will not be formed by adding or combining other colors. Blue, green and red are called primary colors and these colors can be combined to generate various colors.
When the colors yellow and cyan are added it generates a green shade. When the same yellow color is added with magenta it will generate shades of red. Cyan, Magenta, yellow and Black be used to generate color space.
A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist’s resultant displacement?
magnitude: 10.9 mi; direction: 22.6° north of east
magnitude: 10.9 mi; direction: 67.4° north of east
magnitude: 13.0 mi; direction: 67.4° north of east
magnitude: 13.0 mi; direction: 22.6° north of east
Answer:
D 13.0mi, dir 22.6° north of east
Explanation:
Total movement east is 7+5 miles, or 12 miles. Total movement north is 2+3 miles, or 5 miles. The total displacement, as the crow flies, is of [tex]\sqrt{12^2+5^2} =13[/tex]miles. The angle is the inverse tangent of north/east, or [tex]tan^{-1} \frac 5 {12} =22.62°[/tex]
A light wave travels through air at a speed of 3.0x108 m/s. Green light has a wavelength of about 5.76x1014Hz. What is the wavelength of green light
Answer:
521 nm
Explanation:
Given the values and units we are given, I'm assuming 5.76*10^14 Hz is frequency.
The formula to use here is λ * υ = c, where λ is wavelength, υ is frequency, and c is the speed of light.
λ = [tex]\frac{3*10^8\frac{m}{s} }{5.76*10^{14}Hz} = {5.20833*10^{-7} m}\approx{521 *10^{-9}m}={521 nm}[/tex]
Why do opaque materials become warmer when light shines on them?
Opaque materials absorb all the light that shines on them. None of it comes out the other side. That's why they're opaque.
Opaque materials become warmer when light shines on them, because they absorb the energy carried by the light that shines on them. (According to the law of Conservation of Energy, that energy has gotta go somewhere.)
Opaque materials become warmer when light shines on them due to the absorption of light energy by the atoms and molecules of the material.
Explanation:Opaque materials become warmer when light shines on them due to the absorption of light energy. When light hits an opaque material, the photons from the light wave interact with the atoms and molecules of the material. These interactions cause the atoms and molecules to vibrate, generating heat energy and resulting in an increase in temperature.
For example, when sunlight shines on a black, opaque surface, the surface absorbs most of the light energy. The absorbed energy causes the atoms and molecules of the surface to vibrate, leading to an increase in temperature.
In contrast, transparent materials, such as glass, allow light to pass through them without significant absorption. As a result, they do not become as warm when light shines on them.
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In general, why does a toy car change direction when crossing a boundary between two surfaces, such as hard plastic and a carpet, on which its speed is different? Choose the best explanation based on what you’ve learned in this extension. Select one: a. The wheels of the car move at a different speeds on each surface, so the direction they move in is different. b. Between the time the first wheel crosses the boundary and the last wheel of the car does so, the car wheels are moving at different speeds. This causes the car to turn either left or right. c. Between the time the first wheel of each axle of the car crosses the boundary and last wheel of each axle does so, the wheels on the same axle on moving at different speeds. This causes the car to turn left or right. d. The car turns slightly crossing the boundary because the amount of friction the car experiences on each surface is different, so the interaction between the car and the surface changes, which pushes the car slightly to the left or right.
Answer:
D
Explanation:
The car turns slightly crossing the boundary because the amount of friction the car experiences on each surface is different, so the interaction between the car and the surface changes, which pushes the car slightly to the left or right. Hence, option (d) is correct.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
What is friction?
The resistance provided by surfaces in touch as they move past one another is known as friction. To walk without slipping, traction is provided by friction. In most situations, friction is advantageous. They do, however, give a strong amount of opposition to the move.
When the toy car change direction when crossing a boundary between two surfaces, such as hard plastic and a carpet, the frictional force get changed. So, the interaction between the car and the surface changes, which pushes the car slightly to the left or right. Hence option (D) is correct.
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A mass moves back and forth in simple harmonic motion with amplitude A and period T.
a. In terms of T, how long does it take for the mass to move through a total distance of 2A?
t/T= ____________
b. How long does it take for the mass to move through a total distance of 5A?
t/T= ____________
a. 0.5 T
- The amplitude A of a simple harmonic motion is the maximum displacement of the system with respect to the equilibrium position
- The period T is the time the system takes to complete one oscillation
During a full time period T, the mass on the spring oscillates back and forth, returning to its original position. This means that the total distance covered by the mass during a period T is 4 times the amplitude (4A), because the amplitude is just half the distance between the maximum and the minimum position, and during a time period the mass goes from the maximum to the minimum, and then back to the maximum.
So, the time t that the mass takes to move through a distance of 2 A can be found by using the proportion
[tex]1 T : 4 A = t : 2 A[/tex]
and solving for t we find
[tex]t=\frac{(1T)(2 A)}{4A}=0.5 T[/tex]
b. 1.25T
Now we want to know the time t that the mass takes to move through a total distance of 5 A. SInce we know that
- the mass takes a time of 1 T to cover a distance of 4A
we can set the following proportion:
[tex]1 T : 4 A = t : 5 A[/tex]
And by solving for t, we find
[tex]t=\frac{(1T)(5 A)}{4A}=\frac{5}{4} T=1.25 T[/tex]
The time it takes for the mass to move through a distance of 2A is 2 times the period T, and the time it takes for the mass to move through a distance of 5A is 5 times the period T.
Explanation:In terms of T, the time it takes for the mass to move through a total distance of 2A is:
t/T = 2
The time it takes for the mass to move through a total distance of 5A is:
t/T = 5
These equations show that the time it takes for the mass to move through a total distance is proportional to the number of times the amplitude is covered. Therefore, if the distance is 2A or 5A, it will take 2 or 5 times the period T, respectively.
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You are working with a magnet and it breaks in half. You then end up with
A) One north and one south pole.
B) Two south poles only.
C) Two north poles only.
D) Two magnets, each with a south and a north pole.
Correct Answer is D.
The other answers do not make sense. Imagine this. You break a magnet in half. All it does is become a smaller magnet.
You are working with a magnet and it breaks in half. You then end up with two magnets, each with a south and a north pole (D).
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! I CANNOT RETAKE THIS AND I NEED ALL CORRECT ANSWERS ONLY!!!
The following symbol is used to represent ____ in a circuit diagram.
The following symbol is used to represent cell (batery) in a circuit diagram.
D is correct
+ - is battery
you got right
The location of the center of our galaxy was first determined by observations of
The location of the center of our Galaxy was first determined by observations of Globular Clusters
Electrons in a photoelectric-effect experiment emerge from a copper surface with a maximum kinetic energy of 1.10 eV . What is the wavelength of the light?
The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.
If the light is a stream of photons and each of them has energy, this energy is able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.
This is what Einstein proposed:
Light behaves like a stream of particles called photons with an energy
[tex]E=h.f[/tex] (1)
So, the energy [tex]E[/tex] of the incident photon must be equal to the sum of the Work function [tex]\Phi[/tex] of the metal and the kinetic energy [tex]K[/tex] of the photoelectron:
[tex]E=\Phi+K[/tex] (2)
Where [tex]\Phi[/tex] is the minimum amount of energy required to induce the photoemission of electrons from the surface of a metal, and its value depends on the metal.
In the case of Copper [tex]\Phi=4.7eV[/tex]
Now, applying equation (2) in this problem:
[tex]E=4.7eV+1.10eV[/tex] (3)
[tex]E=5.8eV[/tex] (4)
Now, substituting (1) in (4):
[tex]h.f=5.8eV[/tex] (5)
Where:
[tex]h=4.136(10)^{-15}eV.s[/tex] is the Planck constant
[tex]f[/tex] is the frequency
Now, the frequency has an inverse relation with the wavelength [tex]\lambda[/tex]:
[tex]f=\frac{c}{\lambda}[/tex] (6)
Where [tex]c=3(10)^{8}m/s[/tex] is the speed of light in vacuum
Substituting (6) in (5):
[tex]\frac{hc}{\lambda}=5.8eV[/tex] (7)
Then finding [tex]\lambda[/tex]:
[tex]\lambda=\frac{hc}{5.8eV } [/tex] (8)
[tex]\lambda=\frac{(4.136(10)^{-15} eV.s)(3(10)^{8}m/s)}{5.8eV }[/tex]
We finally obtain the wavelength:
[tex]\lambda=213^{-9}m=213nm[/tex]
In this example of the photoelectric effect, the maximum kinetic energy of ejected electrons from a copper surface is given. By using this kinetic energy, Planck's constant, and the work function energy for copper, a calculation can be made to determine the frequency of the incident light. From that frequency, another calculation can determine the corresponding wavelength of the light.
Explanation:This question relates to the photoelectric effect in physics. In essence, the photoelectric effect is a process where electrons are ejected from a material when electromagnetic (EM) radiation is incident on it. The process is explained by the energy of photons, which are quanta of EM radiation, interacting with individual electrons.
A key equation in understanding this interaction is E = hf, where E is the energy of the photons, h is Planck's constant, and f is the frequency of the radiation. Now, the maximum kinetic energy (KEmax) of the ejected electrons is given by, KEmax = hf - BE, where BE represents the binding energy or work function of the electron to the copper surface.
Given that the maximum kinetic energy KEmax is 1.10 eV (electron-volts), and knowing that Planck's constant h is approximately 4.136 x 10^-15 eV/s, we can rearrange the equation to solve for the frequency f -> f = (KEmax + BE) / h. We need the work function or binding energy BE for copper, which is typically around 4.7 eV. Plug all the values into the equation to get the frequency f.
Furthermore, frequency f and wavelength λ are related by the equation c = fλ, where c is the speed of light (~3.0 x 10^8 m/s). Rearranging that equation for λ -> λ = c / f provides the setup to solve for the wavelength of the light used in the photoelectric effect experiment with copper.
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For which optical devices does f have a negative value?
Answer:
i think d
Explanation:because concave and convex mirrors have f negative value
Answer:
B and D ( c )
Explanation:
The optical devices that have f ( focal length ) as negative is the diverging lens ( image b ) and a convex mirror ( image d ).
An optical device is said to have a negative focal length when the image been focused or viewed on it appears on the same side as with the object been viewed as this is observed when images are viewed through a diverging lens ( image b ) and also when an image is viewed through a convex mirror ( image d ). when an image is viewed through an optical device and the image appears on the opposite side the optical device is a said to have a positive focal length ( f )
the negative f ( focal length ) means that the focal point of the optical device is on the same side of the lens as with where the object is placed
Tiffany kicks a soccer ball off the ground and in the air, with an initial velocity of 28 feet per second. Using the formula H(t) = −16t2 + vt + s, what is the maximum height the soccer ball reaches?15.6 feet14.1 feet13.5 feet12.3 feet
Answer:
The maximum height of soccer ball is 12.25 ft.
Explanation:
You know: H(t) = −16t² + vt + s
First you must know the value of the constant "s". For this you know that at the beginning, at time t = 0, the initial height H (0) is zero. Also, you know that the speed v is 28 feet per second. So:
H(0)=-16*0² + 28*0 + s
0=-16*0² + 28*0 + s
0=s
Then, the speed expression is determined as:
H(t) = −16t² + 28*t
The vertex is a point that is part of the parabola, which has the value as ordered minimum or maximum function. At that point an imaginary axis can be drawn that makes symmetric the graph of the function, which is called the axis of symmetry.
Being the parabola: f(x)=a*x² + b*x + c
the vertex is calculated as: [tex](x,y)=(\frac{-b}{2*a} ,f(\frac{-b}{2*a}))[/tex]
In this case, the point "x" of the vertex indicates the time at which the soccer ball reaches the maximum "y" height ( The vertex is at a maximum point of the function.) So, being a=-16 and b=28, the vertex is:
[tex]x=\frac{-b}{2*a} =\frac{-28}{2*(-16)}[/tex]
x=0.875
H(0.875)=-16*(0.875)²+28*(0.875)=12.25
The maximum height of soccer ball is 12.25 ft.
Interactive LearningWare 13.1 explores the approach taken in problems such as this one. A composite rod is made from stainless steel and iron and has a length of 0.241 m. The cross section of this composite rod is shown in the drawing and consists of a square within a circle. The square cross section of the steel is 3.76 cm on a side. The temperature at one end of the rod is 88.9 °C, while it is 10.2 °C at the other end. Assuming that no heat exits through the cylindrical outer surface, find the total amount of heat conducted through the rod in two minutes.
Answer:jyjyjjhjh
Explanation:
hjjhjhjhjjh
Consider a magnetic force acting on an electric charge in a uniform magnetic field. Which of the following statements are true? Check all that apply. The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion. The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the direction of the magnetic field. A magnetic force is exerted on an electric charge moving through a uniform magnetic field. An electric charge moving parallel to a magnetic field experiences a magnetic force. A magnetic force is exerted on a stationary electric charge in a uniform magnetic field. An electric charge moving perpendicular to a magnetic field experiences a magnetic force.
Answer:
Pushing magma up through the interior of earth
Explanation:
Final answer:
The direction and interaction of a magnetic force on a moving electric charge in a magnetic field.
Explanation:
The statements that are true regarding a magnetic force acting on an electric charge in a uniform magnetic field are:
The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion.The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the direction of the magnetic field.An electric charge moving through a uniform magnetic field experiences a magnetic force.An electric charge moving parallel to a magnetic field experiences a magnetic force.Therefore, statements 1, 2, 3, and 4 are true.
explain why meteorologists compare new weather maps and weather maps that are 24 hours old
To see which way atmospheric conditions and meteorological phenomena are moving, and how fast.
Also to see whether they were correct yesterday.
Answer:
Meteorologists would compare a new weather map with one 24 hours old to see how fast a front is moving because the United States is very large, a large number of station models help give a more complete picture of the weather and make weather forecasts more accurate.
Explanation:
100%
When did newton publish his laws of motion
Answer:
The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687.
Explanation:
in situations involving equal masses, chemical reactions produce less energy than what reactions?
help fast!!!!
Answer:
Nuclear reaction
Hope this helps! =)
Explanation:
Explanation:
A chemical reaction is defined as the reaction that involves exchange of electrons between the reacting atoms.
For example, [tex]2Na(s) + Cl_{2}(g) \rightarrow 2NaCl[/tex]
Mass of Na = 23 g/mol
Mass of Cl = 35 g/mol
Mass of NaCl compound = (23 + 35) g/mol = 58 g/mol
So, in chemical reactions law of conservation of mass is obeyed because mass of reacting species is changing from one form to another.
Whereas in nuclear reactions there is splitting or combining of atomic nuclei of atom(s). Since, nuclei is involved in nuclear reaction so more energy is required.
Also, E = [tex]mc^{2}[/tex] so, in nuclear reactions mass of reacting atoms changes into energy. This results in formation of larger amount of energy.
Therefore, we can conclude that in situations involving equal masses, chemical reactions produce less energy than nuclear reactions.
An object is lifted from the surface of aspherical planet to an altitude equal to the radius of the planet.As a result, what happens to the mass and wieght of theobject?
massincreases; weight decreases
massdecreases; weight decreases
massincreases; weight increases
massincreases; weight remains the same
mass remainsthe same; weight decreases
mass remainsthe same; weight increases
mass remainsthe same; weight remains the same
An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet.
As a result, the object's mass remains the same, and its weight decreases to 1/4 of whatever it is when the object is on the planet's surface.
Piano tuners tune pianos by listening to the beats between the harmonics of two different strings. When properly tuned, the note A should have a frequency of 440 Hz and the note E should be at 659 Hz.
(a) What is the frequency difference between the third harmonic of the A and the second harmonic of the E?
(b) A tuner first tunes the A string very precisely by matching it to a 440 Hz tuning fork. She then strikes the A and E strings simultaneously and listens for beats between the harmonics. What beat frequency between higher harmonics indicates that the E string is properly tuned?
(c) The tuner starts with the tension in the E string a little low, then tightens it. What is the frequency of the E string when she hears four beats per second?
Piano tuners use frequency differences and beat frequencies to tune pianos.
Explanation:(a) The frequency of the third harmonic of A can be calculated by multiplying the fundamental frequency of A (440 Hz) by 3, resulting in a frequency of 1320 Hz. The frequency of the second harmonic of E can be calculated by multiplying the fundamental frequency of E (659 Hz) by 2, which is 1318 Hz. To find the frequency difference between the two, subtract the second harmonic of E from the third harmonic of A: 1320 Hz - 1318 Hz = 2 Hz.
(b) When the tuner strikes the A and E strings simultaneously, she listens for beats between the harmonics. The beat frequency indicates that the E string is properly tuned. The beat frequency is equal to the difference between the frequencies of the harmonics. In this case, the beat frequency would be 2 Hz.
(c) When the tuner hears four beats per second, it means there is a beat frequency of 4 Hz between the harmonics. To find the frequency of the E string, we can use the formula: Beat Frequency = Frequency of Higher Harmonic - Frequency of Lower Harmonic. Rearranging the formula, we get: Frequency of Higher Harmonic = Beat Frequency + Frequency of Lower Harmonic. Plugging in the values, we get: Frequency of Higher Harmonic = 4 Hz + 659 Hz = 663 Hz.
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Which choice most accurately describes the method of storing electrical energy in a battery?
A battery can store energy when placed in a circuit. A chemical reaction occurs inside a battery, releasing the energy to push electrons in the circuit.
A battery can store energy when placed in a circuit. Mechanical energy is stored in the battery. This energy is released to push electrons in the circuit.
A battery can store energy when placed in a circuit. A chemical reaction occurs inside a battery, releasing the energy to push protons in the circuit.
A battery can store energy when placed in a circuit. Mechanical energy is stored in the battery. This energy is released to push protons in the circuit.
Final answer:
A battery stores electrical energy via chemical reactions that release electrical energy to move electrons in a circuit when connected.
Explanation:
The most accurate description of how a battery stores electrical energy is through chemical reactions that occur within it when placed in a circuit. These chemical reactions convert chemical potential energy into electrical energy, which is then utilized to move electrons throughout the circuit.
This process increases the potential energy of the electrons, allowing them to do work, such as lighting a bulb or powering a motor. It is important to note that in electrochemical cells, or batteries, electrical energy is generated as a result of a chemical reaction between the reactants, resulting in products with less potential energy than the reactants. When a battery is connected to a circuit, its stored chemical energy is converted into electrical energy to "push" electrons through the circuit.