What is the frequency of an electromagnetic wave having a wavelength of 300 000 km.

The charge accumulated at the boundary between the segments that carries 4 A current along a 1 mm diameter wire is 2.95 * [tex]10^{-18}[/tex] C

η = q / A

η = εo I / A [ 1 / σ1 - 1 / σ2 ]

η = Charge density

q = Charge

A = Area

σ = Conductivity

I = Current

εo = Vacuum permittivity

I = 4 A

εo = 8.85 * [tex]10^{12}[/tex] F / m

σ1 = 1 * [tex]10^{7}[/tex] / Ω m

σ2 = 6 * [tex]10^{7}[/tex] / Ω m

Equating both the formulae of charge density,

q / A = εo I / A [ 1 / σ1 - 1 / σ2 ]

q = 8.85 * [tex]10^{12}[/tex] * 4 ( 1 / [tex]10^{7}[/tex] - 1 / 6 * [tex]10^{7}[/tex] )

q = 8.85 * [tex]10^{12}[/tex] * 4 * [tex]10^{-7}[/tex] ( 1 - 1 / 6 )

q = 2.95 * [tex]10^{-18}[/tex] C

Therefore, the charge accumulated at the boundary between the segments is 2.95 * [tex]10^{-18}[/tex] C

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The static friction value is the value from zero to the minimum force required to initiate motion. The formula for calculating static friction is:

Static Friction = Normal Force x Static Friction Coefficient.

The maximum or limit of friction between two surfaces is FMAX=μR F MAX = μR. where μ is the coefficient of friction and R is the normal reaction between two surfaces. The coefficient of friction is a measure of surface roughness, with rougher surfaces having higher values. Therefore, as the car makes a circular motion, the necessary centripetal force is provided by the frictional force. Therefore, the coefficient of static friction between a car tire and the road surface is 0.53.

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The energy difference between the given shell while transactions between paschen series statement (energy differnce)ΔE = 1.30eV

The Paschen series is a collection of emission lines from atomic hydrogen gas caused by the descent of electrons from an electron shell with n > 3 to an electron shell with n = 3.

An electron moves from a higher state to the n = 3 shell in the Paschen series of the hydrogen atom.

Assume that the electron's starting state is n = 8.

Now to calculate the energy difference we use the following formula:

ΔE = (1/[tex]n^{2}[/tex]low − 1/[tex]n^{2}[/tex]high)13.6eV

According to the given data:

n high =8

n low=3

so putting value on the above formula

ΔE = (1/[tex]3^{2}[/tex]low − 1/[tex]8^{2}[/tex]high)13.6eV

ΔE =(0.095)13.6eV

ΔE = 1.30eV

So,The energy difference between the given shell while transactions between paschen series statement (energy difference)ΔE = 1.30eV

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The Net acceleration of the block is 5.62104907 m/s².

A block is positioned at the bottom of a ramp at a 35-degree angle. With a mass of 13.2 kg, it slides down the ramp with a coefficient of friction of 41 n.

The resistance that surfaces in contact provide to motion when they pass one another is referred to as friction. The two surfaces in contact are causing friction because of their irregularities. Therefore, these surface irregularities become entangled when one object moves over the other, creating friction. The friction will increase in significance as the roughness increases, creating more irregularities.

[tex]F=ma-----[1]\\\\F=mgsinx----[2]\\\\\\ma=mgsinx[/tex]

cancelling m both sides and finally the equation reduces to [tex]a=gsinx[/tex]

g=9.8m/s² , x= 35

a=9.8 sin 35

a=9.8 x 0.57357

=5.62104907 m/s²

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Answer: 20 m/a

Explanation: 600/30=20

A clay liner and a system of pipes is used in a sanitary landfill to

a) Prevent leakage

What is sanitary landfill ?

Sanitary landfill refers to the efficient use of engineering techniques to confine waste to the smallest practical area in order to cover it with a layer of soil to reduce its volume and minimize pollution. It is a land-based method of disposal without harming the environment and public health. of air.

A landfill is a place where waste is isolated from the environment until it is safe. It is believed to be completely biologically, chemically and physically degraded. High-income countries may have higher levels of isolation achieved.

A safe landfill has critical elements: a bottom liner, a leachate collection system, a cover, and a natural hydrogeological environment. The natural environment can be chosen to minimize the potential for waste to enter the groundwater below the landfill.

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The diameter should of the double-walled tube be big for an ice box​ is increase the thermal temperature.

Double wall pipes are an important safety tool when storing liquids such as those used in the chemical wastewater food and beverage industries. The majority of jacketed piping applications are for chemical wastewater-contaminated groundwater and chemical process safety.

Tube wall thickness in excess of that required for internal stresses and known loads not only provides a margin of safety against unexpected loads but also increases survival time when corrosion or fatigue mechanisms are in action. increase. Single-layer tubing is lightweight, flexible, and can be installed quickly with less personnel and equipment. The double wall is a smooth inner double wall with a corrugated outer tube.

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Answer:

-44.95N

Explanation:

electric force = kQ / r²

= 8.99×10^9 × -10.0×10^-6 / 20×10^-2 = -44.95N

hope it helps. :)

Answer:

C) field forces

Explanation:

A) pushing forces (wrong option)

---> gravitational force: an invisible force that pulls objects towards the earth

---> electric force: a contact force that pushes or pulls objects without making any contact, making it a technically non-pushing force

B) contact forces (wrong option)

---> gravitational force: since it is an invisible force (as stated in the explanation for option A), it is a non-contact force

---> electric force: as stated in the explanation for option A, it is also a non-contact force

C) field forces (correct option)

---> gravitational force: is a type of force field since it is a non-contact force

---> electric force: is also a type of force field that cause the attraction or repulsion of forces without actual contact between the charges

D) applied forces (wrong option)

---> not applicable for both forces as supported by all the above information

Explanation:

A huge variety of physical phenomena during interaction is determined by only four types of interactions: electromagnetic, weak, strong and gravitational.

Answer:

C) Field forces

The oscilloscope is also known as scope CRO or DSO the latter is the modern one.

An oscilloscope is used to observe the continuously varying voltage signal. It helps us to measure the varying voltage signal apart from voltage it is also used to measure other signals like sound, vibration also observation but this signal is first converted into voltage and then displayed on an oscilloscope. However this drawback has been covered in the DRO which directly Shows you the result without any conversion.

The oscilloscope shows the voltage with respect to the time which means it captures the voltage signal for a particular time and then shows up the result it means for large where the voltage signal is frequently changing within a second oscilloscope is unable to read and that's why show as a non zero voltage. The energy transfer between the coil without any electrical connection is done by the principle of mutual induction.

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For the man to do the least work, the angle between the force and the horizontal should be 76.

Work is calculated as the force multiplied by the distance travelled in the direction of the force.

given that,

force, f = 100 N

Coefficient of friction, = 0.25

distance, d = 15 m

So, net force, F = force - Coefficient of friction

net force = 100 - 0.25 x m g

Work = (100 - 0.25 mg) x d cosθ

For minimum work, the angle should be maximum.

So, the value of angle θ is 76°.

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a ) The slowest and fastest object are object 2 and object 1 respectively

b ) In a vacuum chamber all objects will fall at the same time

c ) In normal conditions, a golf ball would land first.

a ) From the data taken from the table,

Object 1 lands after 1.1 s

Object 2 lands after 1.8 s

Object 3 lands after 1.3 s

Object 4 lands after 1.1 s

Eventhough object 1 and 4 land at same time, at 1 s mark object 4 has more height than object 1. So object 1 would land first

b ) If conducted in a vacuum chamber, there will be no air resistance,. So all the objects will fall at the same time.

c ) In normal conditions, there will be air resistance. So air resistance will be larger in the object with larger surface area. Feather has a larger surface area than a golf ball. So feather will fall slower than the golf ball.

Therefore,

a ) The slowest and fastest object are object 2 and object 1 respectively

b ) In a vacuum chamber all objects will fall at the same time

c ) In normal conditions, a golf ball would land first.

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The pH is equal to the pKa in a titration of acetic acid and sodium hydroxide that is halfway to equivalence point.

Because of the incomplete dissociation of the acid, the reaction is in equilibrium, with an acid dissociation constant, Ka, which is specific to that acid. point are the same. Therefore, at the halfway equivalence point, the pH is equal to the pKa.

Titration is the slow addition of one solution of a known concentration to a known volume of another solution of unknown concentration until the reaction reaches neutralization, which is often indicated by a color change.

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Answer:

See below

Explanation:

First, find acceleration from  

F = m * a

then    vf = a * t     for the final velocity    ......   Plug and chug

The action which I should take first is a)Stop the attack and contain the damage by disconnecting the system from the network. So correct option is a.

Many people actually rely on the Internet for many of their professional, social and the personal activities. But there are many people who attempt to damage our Internet-connected computers, violate our privacy and render inoperable the Internet services.

Given the frequency and the variety of existing attacks as well as the threat of new and more dangerous future attacks, network security has become a central topic in the field of computer networking.

Hence, correct option is a.

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(Complete question) is:

A security incident is currently occurring on the company network. You discover that the attack involves the computer system that is attached to the network. You're unsure what kind of the damage is being done to the network systems or data. Which of the following actions should you take FIRST?

a)Stop the attack and contain the damage by disconnecting the system from the network.

b)Continuously remain the network system in running state.

c)Try to introduce malware in attacker network system.

d)All of the above.

Using the theories of electricity, we got that group should do first is to improve the design of the plan if a group  have decided that the amount of electricity used by the school should be reduced.

Electricity refers to  physical phenomena that should be connected with the presence and the motion of the matter that actually contain the electric charge property. It is related to the magnetism, also it should be the integral part of the electromagnetism.

Hence, when a group of students have decided that the amount of electricity used by the school should be reduced and  want to develop a plan to solve this problem, the group should do first  is that improve the design of the plan so that the problem should be solved.

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(Complete question) is:

A group of students have decided that the amount of electricity used by the school should be reduced and  the students want to develop a plan to solve this problem. What should the group do first? Select one: a. determine what materials should be used to implement the plan b. conduct research on energy conservation to form the plan c. improve the design of the plan d. test the validity of the plan

The period of oscillation, if at a given time the magnitude of acceleration of a mass is 9 m/s² when its position is 4 meters from equilibrium is 4.188 s

Acceleration can be expressed as,

a ( t ) = - ω² x ( t )

ω² = a ( t ) / - x ( t )

ω² = 9 / - ( - 4 )

ω² = 9 / 4

ω = 3 / 2

ω = 1.5 rad / s

T = 2 π / ω

T = Time period

ω = Angular velocity

T = 2 * 3.14 / 1.5

T = 4.188 s

Therefore, the period of oscillation is 4.188 s

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Kinetic friction from the primary axle bearing, reader pull bearing, aux. pully bearing. The reader makes a sound whilst it pushes against the platter causing strength to be in part launched.

The belongings of any rotating item given by means of second of inertia instances angular pace. it's far the property of a rotating frame given by way of the manufactured from the instant of inertia and the angular velocity of the rotating object. Angular momentum from time to time known as spin is decided through an item's mass, its pace, and how some distance the mass extends out from the factor of rotation.

Angular Momentum is defined because the assets of any rotating object are given by way of the made from the moment of inertia and angular velocity of the rotating item. it is a vector and has both importance and course. The not unusual examples of angular momentum are the rotation and revolution of Earth.

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Cannon A reaches a higher elevation when two cannonballs, a and b, are fired from the ground with identical initial speeds, but with ua larger than ub.

Because elevation rises with increasing angle, Cannon A fires at a higher altitude. Finding the vertical velocity will yield the elevation. The velocity increases as the angle increases. Cannon A's elevation is higher than Cannon B's because the angle from which the projectile was fired from Cannon A was greater. Due to its higher elevation, Cannon A flies higher for a longer period of time. The formula for time is t = (2y)/g, meaning that the larger y is, the larger time will be. Cannon A is in the air for a longer period of time because elevation and vertical velocity affect time.

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The amount of heat transferred is proportional to the temperature difference between the objects and the heat capacity of the object.

Warmness is based totally on the authentic story of Neil McCauley, a calculating criminal and ex-Alcatraz inmate who was tracked down by way of Detective Chuck Adamson in 1964. In 1961, McCauley was transferred from Alcatraz to McNeil, as mentioned in the film.

Considering the fact that Michael Mann's warmness got here out, he's been citing the film as a concept for the paintings he did inside the Dark Knight. Connections have been drawn among the visuals, the interrogation scene, and even solid member William Fitchner, who's in each movie.

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Yes. it means the object is slowing down.

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity. Acceleration has to do with changing how fast an object is moving. Since acceleration is a vector quantity, it has a direction associated with it.

The direction of the acceleration vector depends on two things:

If an object is slowing down, then its acceleration is in the opposite direction of its motion.

In conclusion, If an object is not changing its velocity, then the object is not accelerating.

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Answer:

0.5 kg

Explanation:

W = mg

4.9 = m(9.8)

4.9 = 9.8m

4.9/9.8 = m

m = 0.5 kg

From of the following pairs, the form of radiation with the lower energy are

a.)microwaves or radio waves.

h.)AM radio waves or FM radio waves.

electromagnetic spectrum :

The electromagnetic spectrum is a collection of wavelengths, photon energies, and frequencies that extends frequencies.

gamma rays > X-rays > ultraviolet radiation >  visible light > infrared radiation > radio waves.

wavelength ∝ 1 / frequency

E = hf

where

E = energy

f = frequency

h = Planck’s constant

From of the following pairs, the form of radiation with lower energy are

a.)microwaves or radio waves.

h.)AM radio waves or FM radio waves.

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The linear displacement of the wheel will be 1.5m.

Linear displacement is the measure of straight path covered by the object .

Rotating angular speed of the wheel = 2.0 rad/s

Radius of the wheel = 0.25 m

According to the angular speed and linear speed relationship, we can say that linear speed is the product of angular speed and the the radius of the object

V = linear velocity

r = radius of the wheel

ω = angular velocity

V = 0.25 * 2

V = 0.5 m/s

Also, speed is equal to distance upon time.

V = d/t

Time at wheel the the wheel's linear distance is to be found = 3 s

therefore d = V * t

d = 0.5 * 3

d = 1.5 m

The linear displacement of the wheel after 3.0 s is 1.5 m.

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Every action has an equal and opposite response, according to Newton's Third Law.

Newton's Third Law of Motion is essential for rocket launch. Through action and reaction, a rocket engine generates thrust. Hot exhaust gases from the engine exit via the back of the engine. In response, the opposing reaction produces a propelling force.

Forces always act in pairs that are equal but opposite, according to Newton's third law of motion. Another way to put it is that there is an equal but opposing reaction to every action. In other words, when you push against a wall, the wall pushes back at you with a force equal to your own.

There is an equal and opposite reaction to every action, according to Newton's third law. The implication of the statement is that there are always two forces acting on the two interacting objects. The force acting on the first object is equal in size to the force acting on the second.

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The maximum speed of the cycle is 21 m/s.

When the motorcyclist takes the curve on the hill, a net frictional force acts on it towards the center and acts as the centripetal force.

The radius of the hill is = 45 m

Also , the weight of the motorcycle acts downwards and the normal reaction acts upwards. As the motorcycle is on the curve so , a component of the weight acts towards the center.

weight is given by , W = mg

So the net F(friction)  = mg - N = [tex]\frac{mv^{2} }{r}[/tex]

For loosing contact,  N=0

[tex]v^{2}[/tex] = rg

v = [tex]\sqrt{rg}[/tex]

v = [tex]\sqrt{(45)(9.80)}[/tex]

v = 21 m/s

So the maximum speed of the motorcycle can be 21 m/s.

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Answer:

displacement=√50^2+50^2=70.71m

Explanation:

Distance traveled by the athlete=length of the arc

=d(theta)r

Here the athlete runs 3\4of a circle whose radius is 50 m

here, d(theta)=3(pi)/2rad

hence distance=3(pi)/2 x 50

=235.61 m

displacement=the chord between the initial point and the final point. it subtends an angle of 90degrees at the centre of the circle.

it forms a right angled triangle.

hence by Pythagoras theorem,

displacement=√50^2+50^2=70.71m

Answer:

.12 kg

Explanation:

Area under car = pi 3^2 = 9 pi  m^2

Area of piston = pi (.03)^2 = .0009 pi m^2

As a ratio:

.0009 / 9 =  x / 1200

x = 1200 ( .0009/9) = .12 kg