what is the electrical potential difference needed to accelerate an electron from rest to a velocity of 1 x 106 m/s? (the mass of an electron is 9.1x10-31 kg and the charge on an electron is 1.6 x 10-19 c)

Answers

Answer 1

Equation: 12 mv2 = eV wherein e is just the photon energy (1.6x10-19 C), gives a kinetic energy of the an electron propelled across a voltage differential of V volts.

What is the potential difference V formula?

The change in momentum (PE) of a charge (q) transported from point A to point B, divided by the charge, is thus used to determine the potential difference among points A and B as V = VB - VA.The joules per coulomb, sometimes known as volts (V), are the units of potential difference. Alessandro Volta gave them this name.

When a voltage differential V accelerates a proton at rest, what happens?

A proton's speed is determined to be v when it is propelled by a potential difference.When accelerated with the same voltage differential from rest, a particle will travel at the following speeds: 1. v.

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Related Questions

Match each sound feature to its description

amplitude

the density of the medium's particles

at the compressions of the wave

compression

the part of a wave where the particles

of the medium are farther apart

wavelength

the distance between compressions

or rarefactions

rarefaction

the part of a wave where the particles

of the medium are closer together

Intro

Done

tivity

be here to search

GOS

Answers

Answer:

1. Amplitude.

2. Rarefaction.

3. Wavelength.

4. Compression.

Explanation:

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission. Some of the properties of sound waves as it travels through a medium such as solid, liquid and gas includes the following;

1. Amplitude: the density of the medium's particles at the compressions of the waves.

2. Rarefaction: the part of a wave where the particles of the medium are farther apart. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are separated by a greater distance.

3. Wavelength: the distance between compressions or rarefactions i.e the distance between two successive compressions or refractions.

4. Compression: the part of a wave where the particles of the medium are closer together. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are closer together.

Answer:

here is the answers .......

Match each sound feature to its descriptionamplitudethe density of the medium's particlesat the compressions

Problem 1 Line Broadening II Which cause for line broadening is dominant in the following cases? (a) Starlight moves through a cloud of hydrogen atoms of particle density n = 105/m³ and temper- ature T 10 K. Is the natural line width AwN, the Doppler width Awp or the collision width Awc the dominant cause for the broadening of the hyperfine transition and the Lyman a-line? The decay time for the hyperfine transition 1¹S1/2 (F= 0 F = 1) at λ = 21 cm is to = 109 s and the collision cross section to 10-9 s and o= 10-15 cm². = 10-22 cm², whereas for the Lyman a-line A = 121.6 nm, 5 (3+2) points (b) A laser beam of wavelength λ = 3.39 µm and a beam diameter of 1 cm is sent through a methane cell, in which CH4-molecules at T = 300 K absorb on the transition ik (tok = 20 ms). Is the natural line width Awy, the Doppler width Awp, or the flight time width AwFT the largest?

Answers

In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening is ________.

In the case of a laser beam passing through a methane cell, the largest line broadening effect is due to ________.

In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening depends on the given parameters. The natural line width (AwN) is primarily determined by the lifetime of the excited state, which is given as to. The Doppler width (Awp) is influenced by the temperature (T) and the mass of the particles. The collision width (Awc) is influenced by the collision cross section and the particle density (n). To determine the dominant cause, we need to compare these factors and assess which one contributes the most significantly to the line broadening.

In the case of a laser beam passing through a methane cell, the line broadening is affected by different factors. The natural line width (AwN) is related to the energy-level structure and transition probabilities of the absorbing molecules. The Doppler width (Awp) is influenced by the temperature (T) and the velocity distribution of the molecules. The flight time width (AwFT) is determined by the transit time of the molecules across the laser beam. To identify the largest contributor to line broadening, we need to evaluate these effects and determine which one has the most substantial impact on the broadening of the spectral line.

the dominant cause of line broadening in starlight passing through a cloud of hydrogen atoms and in a laser beam passing through a methane cell depends on various factors such as temperature, particle density, collision cross section, and energy-level structure. To determine the dominant cause and the largest contributor, a thorough analysis of these factors is required.

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The acceleration of gravity on the moon is 1.62m/2. If a ball is dropped on the moon from a height of 1.50m, determine the time for the ball to fall on the surface of the moon

Answers

The time taken by the ball to reach the surface of the moon that drops from a height of 1.5 m from the moon is 1.36s.

Given that the acceleration of gravity on the surface of the moon is, \(a=g=1.62 ms^{-2}\). The distance of the ball from the surface is the height of the ball from the surface. So, \(h=d=1.5 m\).

Since the ball is dropped under gravity or free-fall motion from rest, then the initial velocity is zero (i.e.) \(v=0ms^{-1}\). Let t be the time taken by the ball to reach the surface of the moon.

By the equation of motion, the equation is given by \(h=v_{0} t+\frac{1}{2}gt^{2}\), where g is the gravity, t is the time taken by an object, h is the distance of the object, and \(v_{0}\) is the initial velocity of an object from the rest.

Substitute the values of h, g, and \(v_{0}\) in the above equation, and we get

\(1.5=(0)t+\frac{1}{2}(1.62)t^{2}\)

\(1.5=0.81t^{2}\)

\(t^{2} =\frac{1.5}{0.81}\)

\(t^2=1.852\)

\(t=\pm1.36s\)

The time taken cannot be negative.

Therefore, The time taken by the ball to reach the surface of the moon is 1.36s.

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PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST THIS IS A SCIENCE QUESTION
Fusion reactions in the sun change nuclear energy into
mechanical energy
chemical energy
electromagnetic energy
potential energy

Answers

Answer:

Electromagnetic energy

Which are examples of a Simple machine?
Question 4 options:


Hammer that swings on a nail


Light Switch that flips


Door stop that wedges at the bottom


The wheels on a bike

Answers

Wheels on a bike
Hope this helps

Answer:

the wheels on a bike

Explanation:

do you go to k-12 if you do can you help me please have a good night/day :) ❤

\(\huge\mathfrak\red{Question}[\tex]

When two magnets repel, they

A. break
B. pull together
C. push apart
D. change color​

Answers

Answer:

option C : they push apart

Explanation:

If you hold two magnets the wrong way around, they push apart - they repel! In other words, if you hold two magnets together so that like-poles are close together (two norths OR two souths), they repel

Answer:

the magnet push apart

Explanation:

that is the two magnet are facing each other with the same pole...

that is to say like pole push apart and unlike pole attract

you push a block of 50kg with a force of 400 N over a distance of 8m. How much kinetic energy does the box gain?

Answers

Answer:

The box gains 3200 J of kinect energy.

Explanation:

What is kinect energy?

Kinect energy is the energy of an object has because of its motion. Almost anything that has mass and it's in motion has kinect energy. Examples:

wind;throwing a footbal;driving a car;lauching a rocket;etc.

What is the work energy theorem?

Also known as the principle of work and kinect energy, it states that the work done by all forces acting upon an object equals the change of its kinect energy.

For example, if you pull a box, then you're exerting a force on it and it moves forward. Since the box has mass and it's in motion, you have changed its kinect energy.

Solution:

Write the data down:

\(\bullet \quad \mathsf{m=50\,kg}\\\\\bullet \quad \mathsf{F=400\,N}\\\\\bullet \quad \mathsf{d=8\,m}\)

Apply work energy theorem:

\(\mathsf{W}= \Delta\mathsf{K}\)

The amount work done equals the change of kinect energy:

\(\mathsf{W}=\mathsf{K-K_o}\)

Since the block is at rest at the beginning, so it has zero initial kinect energy:

\(\mathsf{W}=\mathsf{K-0}\\\\\\\mathsf{W}=\mathsf{K}\)

Now, apply the formula for work to the left hand side of the equation:

\(\mathsf{F\cdot d}=\mathsf{K}\\\\\\\mathsf{400\cdot 8}=\mathsf{K}\\\\\\\therefore \boxed{\mathsf{K=3200\,J}}\)

Conclusion: the box has gained 3200 J of kinect energy.

Happy studying!

Brainly Team

you push a block of 50kg with a force of 400 N over a distance of 8m. How much kinetic energy does the

The following circuit contains three capacitors C₁ = 16 µF, C₂ 6μF, and C3 = 10µF connected to a battery with an unknown emf &. The charge on capacitor C₁is Q₁ = 12 uc. 1. What is the equivalent capacitance Ceq of the circuit? H₁₂ A. 75 x 10-6 F B. 8. 0 x 10-6 F C. 10. 0 x 10-6 F D. 12. 0 x 10-6 F E 2. How much energy is stored on capacitor C₁? A. 49 x 10-6 J C. 25 x 10-5) B. 3. 0 x 10-6/ C₂ tha C₂

Answers

The equivalent capacitance Ceq of the circuit is 75 x 10⁻⁶ F, and the energy stored on capacitor C₁ is 49 x 10⁻⁶ J.

equivalent capacitance Ceq of a circuit with three capacitors in parallel can be found by adding the individual capacitances. In this case, C₁ = 16 µF, C₂ = 6 µ

F, and C₃ = 10 µ

F. So, Ceq = C₁ + C₂ + C₃

= 16 µ

F + 6 µ

F + 10 µ

F = 32 µF. Therefore, the answer to the first question is A. 75 x 10⁻⁶ F.

The energy stored on a capacitor can be calculated using the formula

E = 1/2 ×C ×V²

where E is the energy, C is the capacitance, and V is the voltage across the capacitor. Since the charge Q₁ on capacitor C₁ is given as 12 µC and the capacitance C₁ is 16 µF, we can calculate the voltage V₁ across capacitor C₁ using the formula Q = C ×V.

Thus, V₁ = Q₁ / C₁

= 12 µC / 16 µ

F = 0.75 V.

Now, we can calculate the energy stored on capacitor C₁ using the formula E₁ = 1/2 ×C₁ ×V₁²

= 1/2 ×16 µF ×(0.75 V)²

= 9 µJ.

Therefore, the answer to the second question is A. 49 x 10⁻⁶ J.

In conclusion, the equivalent capacitance Ceq of the circuit is 75 x 10⁻⁶ F, and the energy stored on capacitor C₁ is 49 x 10⁻⁶ J.

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Wolfgang pauli hypothesized an exclusion principle. This principle says two electrons in an atom cannot have the same what?.

Answers

No two electrons can have the same set of quantum numbers .

What is Wolfgang Pauli hypothesized an exclusion principle?

Pauli made a significant advance when he proposed the notion of adding a fourth quantum number to the three that were previously used to represent the quantum state of an electron. Physically speaking, the first three quantum numbers made sense since they had to do with how the electron moved about the nucleus.

The following rule was developed by Austrian physicist Wolfgang Pauli. The quantum numbers of any two electrons cannot be identical.

To put it another way, no two electrons can be in the same state. The Pauli exclusion principle is the name given to this proposition since it forbids electrons from being in the same state.

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If the force of attraction btw earth and us is equal n opposite then why is the net force zero and if it is zero why do we get pulled towards earth

Answers

Answer:

Explanation:

It's not equal and opposite. You're thinking of Newton's 3rd Law. This is not that. This is gravitational attraction between 2 objects. We can figure out mathematically the pull that the earth has on a single person, by using the equation for gravitational force and the universal gravitational constant, G:

\(F_g=\frac{Gm_1m_2}{r^2}\) where G is the universal gravitational constant, m1 is the mass of one person, m2 is the mass of the earth, and r-squared is the addition of the radius of the earth plus the radius of you in relation to the surface of the earth.

Let's say a person weighs 150 pounds; in Newtons this is 667 N (rounded from 667.233); his mass then, in terms of the metric system (using 9.8 for gravity), is 68.2 kg. Let's also say that this person is 6 feet tall. 6 feet is the same as 1.83 m (rounded to 3 sig fig's) and the radius from that person's center to the surface of the earth would be about half that height at r = .915 meters. Filling in the formula:

\(F_g=\frac{(6.67*10^{-11})(68.2)(5.98*10^{24})}{(6.38*10^6)^2}\) it turns out that the person's radius adds nothing significantly to the radius of the earth, so it doesn't even count mathematically. It's way too small compared to the earth's radius (which is the denominator of that equation). We find that

\(F_g=668N\) That's the pull that the earth has on that person which, not coincidentally, is the weight in pounds we said that the person was. Isn't physics amazing!?

superparamagnetism is when the thermal properties of the disk cause the encoded magnetic grains to spontaneously change their polarity.

Answers

Superparamagnetism refers to the phenomenon where thermal effects cause magnetic grains in a material to spontaneously switch their magnetic polarity. This behavior is influenced by the thermal properties of the material.

Superparamagnetism occurs in magnetic materials, particularly when they are in the form of nanoparticles or small grains. At very small sizes, the thermal energy in the system can overcome the energy barrier that keeps the magnetic moments aligned in a particular direction. As a result, the magnetic grains or nanoparticles exhibit random fluctuations in their magnetic orientations.

These fluctuations are driven by thermal energy, and the phenomenon is strongly dependent on temperature. As the temperature increases, the likelihood of spontaneous changes in magnetic polarity also increases. This behavior is in contrast to bulk magnetic materials, where the magnetic moments tend to align in a specific direction due to interatomic interactions.

Superparamagnetism has applications in various fields, including magnetic data storage, biomedical imaging, and magnetic nanoparticles for targeted drug delivery. Understanding and controlling superparamagnetic behavior is important for optimizing the performance of magnetic materials in these applications.

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Which one of the following statements concerning fluid streamlines is true? A) In steady flow, streamlines must remain parallel and equally spaced: In turbulent flow; two or more streamlines may cross. B) In turbulent flow, streamlines can begin or end at any point: Streamlines are perpendicular to the velocity of the fluid at every point: C) In steady flow, the pattern of streamlines does not change with time

Answers

The statement that is true is that in turbulent flow, streamlines can begin or end at any point: streamlines are perpendicular to the velocity of the fluid at every point.

At any given point of time, when the flow of water is constant with respect of time then it is called streamline flow. Streamline flow occurs when there are sharp edge obstacles in the path of a fast-moving fluid. Streamline flow is explained by Pascal's principle. In steady flow, the liquid velocity at any particular point is the same. In steady flow of water, we can consider that the two layers of water cannot meet or merge with each other and it will flow continuously without any interruption. The high viscosity index number  of any fluid describes many things about that fluid like high viscosity number describes about the rigidity of that fluid with respect to the flowing area. Streamline flow of any fluid means its smooth flow after passing through a cut edge without disturbing its path.

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The result of multiplying the frequency of an oscillating body by its periodic time equals .................... A-1/2 B-1/4 C-1/3 D-1

Answers

Answer:

1

Explanation:

The frequency of an oscillating body is given by :

f = 1/T

Whre

T is the time period or the periodic time

The product of frequency and the periodic time will be :

\(f\times T\\\\=f\times \dfrac{1}{f}\\\\=1\)

Hence, the required product is equal to 1.

coherent light with wavelength 460 nm falls on a pair of slits. on a screen 1.85 m away, the distance between dark fringes is 3.96 mm.

Answers

To analyze the given scenario, we can use the formula for the fringe separation in a double-slit interference pattern:

Δy = (λL) / d

Where:

Δy is the fringe separation

λ is the wavelength of light

L is the distance from the slits to the screen

d is the distance between the slits

Given:

Wavelength (λ) = 460 nm = 460 × 10^(-9) m

Distance from slits to screen (L) = 1.85 m

Fringe separation (Δy) = 3.96 mm = 3.96 × 10^(-3) m

We can rearrange the formula to solve for the distance between the slits (d):

d = (λL) / Δy

Substituting the values:

d = (460 × 10^(-9) m) × (1.85 m) / (3.96 × 10^(-3) m)

Simplifying the equation, we get:

d ≈ 2.14 × 10^(-3) m

Therefore, the distance between the slits is approximately 2.14 × 10^(-3) meters.

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1. Describe How can you use density to determine if an object will sink or float in a
fluid?

Answers

Answer:

Density is the only thing affecting whether something floats or sinks . If an object has a higher density than the fluid it is in ( fluid can mean liquid or gas ) , it will sink . If it has a lower density , it will float . Density is determined by an object's mass and volume .

Hope this helps

A ball is thrown vertically upward. As it rises, what happens to its potential energy?​

Answers

Answer:

Explanation:

As the ball rises, its PE increases because the potential energy is equal to the mass of the ball times gravity times the height of the ball. The higher the height, the higher the PE.

Answer:

According to the law of conservation of energy its kinetic energy is getting converted in to potential energy because of gain in height. So, if the velocity of a ball goes on decreasing when it is thrown vertically upwards. When its velocity becomes zero, its potential energy becomes maximum.

John has done work of 1000 J while pushing a table using 300N force. find the distance covered by the table along the direction of the force.​

Answers

distance covered by table

=work done/force=1000/300=10/3

=3.333m

Answer:

distance = (10/3) m or 3.33... m

Explanation:

When the direction of force and distance is the same,

Work = Force × distance

So,

1000J = 300N × distance

=> 1000J/300N = distance

=> (10/3) m = distance

=> 3.33... m = distance

A ball is thrown horizontally at a speed of 16 m/s from the top of a cliff. If the ball hits the ground 6.0 s later, approximately how high is the cliff? 360m 240m 180m 150m

Answers

Answer:

Y = 176.4 m

Explanation:

For the height of cliff we will analyze the vertical motion. We will apply the 2nd equation of motion:

Y = V₀y*t + (0.5)gt²

where,

Y = Height = ?

V₀y = Initial Vertical Velocity = 0 m/s (since, ball is thrown horizontally)

t = time = 6 s

g = 9.8 m/s²

Therefore,

Y = (0 m/s)(6 s) + (0.5)(9.8 m/s²)(6 s)²

Y = 176.4 m

Two objects X and Y move directly towards each other. The objects have the same mass.
Object X has a velocity of 5.0 m/s to the right. Object Y has a velocity of 3.0 m/s to the left.
Object X and object Y collide and stick together.
What is their velocity after colliding?

Answers

X and Y are two things that travel in the same direction. The mass of the things is the same. 5.0 m/s is the velocity of object x as it moves to the right. The velocity of object y to the left is 3.0 m/s. Objects x and y collide and adhere to one another. Following their collision, they both move at a speed of 1.0 m/s to the right.

Their velocity after colliding is 1.0 m / s to the right.

What is the velocity during the collision?

In a collision, the velocity change is always computed by subtracting the initial value from the final value. If an object is moving in one direction before a collision and rebounds or somehow changes direction, then its velocity after the collision has the opposite direction as before.Inelastic collisions occur when only the momentum is conserved but not the system's kinetic energy. Perfectly inelastic collisions happen when objects stick together and have a common velocity after collision. To solve for the final velocity in perfectly inelastic collisions, use v' = (m1v1 + m2v2)/m1 + m2.The magnitude of the relative velocity is the same before and after the collision.

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What are contaminants

Answers

Contaminants are substances or agents that are present in a material or environment, frequently in unwanted or hazardous proportions, and which may harm the environment, and human health.

What is Chemical contaminants?

They include pollutants that are released from industrial operations, agricultural practices, or human activities, such as pesticides, heavy metals, volatile organic compounds (VOCs), and polychlorinated biphenyls (PCBs).

Explain Radiological contaminants.

They include pollutants that are released from industrial operations, agricultural practices, or human activities, such as pesticides, heavy metals, volatile organic compounds (VOCs), and polychlorinated biphenyls (PCBs).

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why is a screw a kind of inclined plane

Answers

An inclined plane makes work easier by breaking an upward or downward movement into smaller increments, A screw is like an inclined plane wrapped around a cylinder, A screw turns a small rotational force into a larger forward driving force.

What force is represented by vector a

Answers

Answer:

velocity

Explanation:

Velocity represents the direction of an object with a specified speed

True or False
1)All forces cause a change in an object’s speed and direction.

Answers

Answer:

True

Explanation:

Answer and Explanation:

True I believe bc if you put a certain amount of force on an object it'll move and depending on where you place the force on the object it'll move in that direction. How much force and how much weight the object has will determine the speed...

dim your high-beam headlights to low-beams within ______ feet when a vehicle is coming towards you.

Answers

When a vehicle is approaching you, it is important to dim your high-beam headlights to low beams within a distance of approximately 500 feet.

This distance provides enough time for the oncoming driver to adjust their vision and safely navigate the road. By dimming your high beams, you reduce the risk of blinding the other driver and causing potential accidents or discomfort. Maintaining proper headlight etiquette promotes safety and ensures a clear line of sight for all drivers on the road, allowing for a smoother and more secure driving experience during nighttime or low visibility conditions.

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A cooler made of which of the following will do the best job of conducting heat?aluminumcoppersilverglass

Answers

A cooler made of copper will do the best job of conducting heat.

Copper has the highest thermal conductivity compared to aluminum, silver, and glass. Thermal conductivity refers to the ability of a material to transfer heat. Copper can transfer heat quickly and efficiently, making it a popular choice for heat sinks and cooling devices. Aluminum also has good thermal conductivity, but not as high as copper.

Silver has even higher thermal conductivity than copper, but it is not as commonly used due to its high cost. Glass has very low thermal conductivity and is not a good conductor of heat. In summary, if you are looking for a material that will do the best job of conducting heat for a cooler, copper is the best choice due to its high thermal conductivity.

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Please help!! I need this asap I will mark brainliest!!

Please help!! I need this asap I will mark brainliest!!

Answers

Answer:

50N to the right

Explanation:

You would find net force by adding the 20 and the 30 together since they are being pushed to the same side (the right). Therefore, the answer will be 50N to the right.

what is the mass of an object whose momentum is 35kg-m/s ..when its velocity is 7m/s​

Answers

Answer:

5kg

Explanation:

p = mv

m = p/v

m = 35/7

m = 5kg

Answer:

5 kilograms

Explanation:

Mass can be found using the following formula.

\(m=\frac{p}{v}\)

where p is the momentum and v is the velocity.

The object has a momentum of 35 kg m/s and a velocity of 7 m/s. Therefore,

p= 35 kg m/s

v= 7 m/s

Substitute these values into the formula.

\(m= \frac{35 kg- m/s}{ 7 m/s}\)

Divide 35 kg m/s  by 7 m/s. (35/7=5)

The m/s in the numerator and denominator cancel each other out.

\(m= 5 kg\)

The mass of the object is 5 kilograms.

A man is trying to push a 250 N dresser across his carpeted bedroom. He applies a force of 20 N and the carpet provides a frictional force of 8N. Which vectors represented in the diagram below will you need to consider and what will be the resulting net force?

A man is trying to push a 250 N dresser across his carpeted bedroom. He applies a force of 20 N and the

Answers

Answer:

The correct option is;

B. Subtract vectors A from C; \(F_{Net}\) = 12 N

Explanation:

The given parameters are;

The weight of the dresser = 250 N

The force applied by the man = 20 N = C

The frictional force provided by the carpet = 8 N = The component of the weight resisting motion = A

Therefore, the net force tending to put the dresser in motion, \(F_{Net}\), is given as follows;

\(F_{Net}\) = The force applied by the man, C - The frictional force provided by the carpet which is the component of the weight resisting motion, A

\(F_{Net}\) = C - A = 20 N - 8 N = 12 N

\(F_{Net}\) = 12 N

The resulting net force, \(F_{Net}\) = 12 N.

The resultant force can be obtained by subtracting vector C from Vector A and the value of net force is 12 N. Hence, option (C) is correct.

Given data:

The weight of man is, W = 250 N.

The magnitude of applied force is, F = 20 N.

The magnitude of frictional force is, f = 8 N.

As per the given problem and the diagram let the applied force be denoted by vector A, Then,

Magnitude of Vector A = 20 N

And the frictional force be denoted by vector C. Then,

Magnitude of Vector C = 8 N

We know that the role of frictional force is to oppose the motion or to oppose the effect of applied force. Then the resultant force is given as,

\(F_{net} = F-f\\\\F_{net} = 20 - 8\\\\F_{net} = 12 \;\rm N\)

Thus, we can conclude that the resultant force can be obtained by subtracting vector C from Vector A and the value of net force is 12 N. Hence, option (C) is correct.

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by how many millimeters does the icicle shrink if a bitterly cold wind drops the temperature to -26 ∘c∘c ?

Answers

An icicle shrinks in size when the temperature drops because the water molecules within the icicle lose energy and move closer together, causing the icicle to contract. To determine the amount by which the icicle shrinks at a temperature of -26°C, we need to consider the thermal expansion coefficient of ice.

The thermal expansion coefficient of ice is approximately 51 x 10^(-6) per degree Celsius. This means that for every degree Celsius decrease in temperature, ice contracts by 51 x 10^(-6) of its original size.

If we assume that the icicle is made entirely of ice and has an initial length of L millimeters, the contraction in millimeters can be calculated using the following formula:

Contraction = L * (T2 - T1) * α

Where:

L is the initial length of the icicle,

T1 is the initial temperature (assumed to be 0°C),

T2 is the final temperature (-26°C),

α is the thermal expansion coefficient of ice.

Plugging in the values, we have:

Contraction = L * (-26) * 51 x 10^(-6)

Simplifying the equation, we get:

Contraction = -1.326 L

Therefore, the icicle would shrink by approximately 1.326 times its original length at a temperature of -26°C.

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consider a photoelectric effect apparatus in which the target electrode is made of a metal which has a workfunction of 2.95 ev. what is the stopping voltage for the electrons emitted from the metal due to light with energy 6.8 ev?

Answers

To answer your question, we'll consider the photoelectric effect, where the target electrode is made of a metal with a work function of 2.95 eV. The light incident on the metal has an energy of 6.8 eV. The stopping voltage (V) can be calculated using the following equation:

V = (E_light - W) / e

Here, E_light is the energy of the light (6.8 eV), W is the work function of the metal (2.95 eV), and e is the elementary charge (approximately 1.6 x 10^-19 C).

First, find the kinetic energy of the emitted electrons by subtracting the work function from the light energy:

Kinetic energy = 6.8 eV - 2.95 eV = 3.85 eV

Now, calculate the stopping voltage using the equation:

V = (3.85 eV) / (1.6 x 10^-19 C) ≈ 2.41 x 10^-19 J/C

Therefore, the stopping voltage for the electrons emitted from the metal due to light with an energy of 6.8 eV is approximately 2.41 V.

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