The mechanical energy of a system of objects is conserved: Group of answer choices only when the objects move along closed paths none of the above only when the work done by the resultant external force is zero only when external forces act on the objects always

When a proton slows from 0. 8c up to 0. 6c, it’s kinetic energy decreases by what factor of 1/4.

Kinetic energy of a proton having a charge Q and Voltage V is given by:

Kinetic energy = Q×V

Where, Q is the charge

            V is the Voltage

Kinetic energy is directly proportional to the charge on a proton.

Let the kinetic energy of proton having charge 0.8C be KE₁ and kinetic energy of proton having charge 0.6C be KE₂

Hence KE₁ = 0.8 × V

KE₂ = 0.6 × V

Now, KE₁ / KE₂ = 0.8 V / 0.6 V

⇒          KE₁ / KE₂ = 4 / 3

⇒         KE₂ / KE₁ = 3/4

⇒         KE₂ = 3/4 times KE₁

Hence, the final kinetic energy becomes 3/4 times the initial kinetic energy.

The kinetic energy decreases by a factor of:

Change = KE₁ - KE₂

Change = KE₁ - 3/4KE₁

Change = 1/4 KE₁

Hence, the kinetic energy decreases by a factor of 1/4

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A photon's energy and wavelength are inversely related. Since the wavelength of photons of blue light is less than photons of red light, it contains more energy than red photons.

Wavelengths of blue light are shorter, ranging from 450 to 495 nanometers. Red light has wavelengths that range from 620 to 750 nm and longer waves. Compared to red light, blue light has a greater frequency and more energy.

A photon's energy varies with its wavelength; those with longer wavelengths have less energy than those with shorter ones. For instance, red photons are less energetic than blue ones.

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Answer:

5 seconds

Explanation:

The vertical position of the ball will be given by the equation

df = do + vo t + 1/2 a t^2        df = final position  = 0  ( on the ground

                                              do = original position  ( 25 m )

                                               vo = original velocity (+ 20 m/s)

                                                a = - 10 m/s^2

So this becomes

0 = 25 + 20 t  - 1/2 (10)t^2      

  =  - 5 t^2 +20 t + 25             Use Quadratic Formula   a = -5    b=20  c = 25

                                                      to find the positive value of t = 5 seconds

150 kJ of energy was given out over the course of the reaction and 200kJ is required for the reactants to be converted into products.

We know that the combination of the reactants is what leads to the formation of products. The interaction of the reactants and the products is what is shown on the potential energy curve. The hump at the highest point of the graph is the activation energy while the difference between the energy of the reactant and the products is the enthalpy of the reaction.

Now; the enthalpy change is given as;

ΔH = 200 kJ - 50 kJ = 150 kJ

Ea = 250 kJ - 50 kJ = 200kJ

We can see that 150 kJ of energy was given out over the course of the reaction and 200kJ is required for the reactants to be converted into products.

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The mathematical relationship between wavelength and energy transmission E = hv.

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. This length is often defined in wireless systems in metres (m), centimetres (cm), or millimetres (mm) (mm). The wavelength is most frequently described in nanometers (nm), which are units of 10⁻⁹ m, or angstroms (Å), which are units of 10⁻¹⁰ m, for infrared (IR), visible light (UV), and gamma radiation (γ).

The most fundamental aspect of global energy integration is energy transmission. With the flow of electricity produced from coal as well as from hydro, nuclear, wind, and solar energy all being transported through power networks, electric energy transmission is a significant source of energy transport.

Wavelength and frequency are connected to energy in the same way as they are to light. Greater energy is correlated with shorter wavelengths and higher frequencies. Therefore, lower energy is produced by longer wavelengths and lower frequencies. E = hv is the energy equation.

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Electric utility power blackouts will result in short electric power outages for the organization.

When the electrical power network, often known as the electrical grid, is down, there are power outages. Power outages can have a variety of causes, but they always tend to affect entire regions or cities rather than simply a single residence. For example, the Northeast blackout of 2003 left 50 million people without power from New York to Canada’s capital Ottawa.  

A place experiences a blackout when all power is lost. Power outages of this kind generally affect a sizable population over perhaps extraordinarily broad areas. Blackouts are particularly difficult to quickly fix because they typically result from significant damage to electrical generation facilities (such as structural damage from violent wind storms or lightning strikes). As a result, these types of outages can, in the worst-case scenarios, last for several weeks.

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Tension reinforced section is when you have steel reinforcement (rebar) on the tension controlled region where the rebar is used to counteract the lack of tensile strength in concrete. When reinforcement is only present in the tension zone, you have a singly reinforced beam.

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The current that will flow in the secondary coil will be 23.5 Amperes

Power is the rate per unit time, at which electrical energy is transferred by an electrical circuit.

The SI unit of power is the watt and is given by Voltage * Current

Let's solve the question:

Given:

Voltage ( Primary ) = Vp = 114 V

Current ( Primary ) = Ip = 6 A

Voltage ( Secondary ) = Vs = 29 V

Current ( Secondary ) = Is = ?

In Ideal Transformer Primary Power = Secondary Power

Therefore, Vp * Ip = Vs * Is

                  114 * 6 = 29 * Is

                   684 = 29 Is

                   Is = 23.5 Amperes

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A Final statement or concluding statement

As, Pressure(P)=(Force(F))/(Area(A)) . So, By Lying down flat on the ice and crawl towards shore will help to get off the ice safely.

Pressure and area of contact are related in such a way that they are inversely proportional to each other.

As the area shrinks, so does the pressure.

Consider the difference between the pressure exerted by a finger pressing on the skin and the pressure exerted by a needle attached to a syringe.

When pressed, the finger may cause a slight depression on the skin but may not cause any pain.

When the same force is applied to a needle, however, the pressure produced  is sufficient to puncture the skin.

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Answer:

It won't increase according to Boyle's law

Explanation:

Volume of a gas varies inversely as the pressure so as more fixed volume of gas is added to the chamber the pressure reduces

Explanation:

i think it give out energy when it melts

A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body due to conservation of angular momentum.

What is conservation of angular momentum?

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Stop and wait until the light stops flashing stop and proceed only when clear.

Flashing Red - A flashing red traffic signal light means "STOP." After stopping, you may proceed when it is safe.

How must you react to a flashing red traffic light?

What must a driver do at a flashing yellow light ?

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An electric motor has an effective resistance of 29. 4 ω and an inductive reactance of 42. 6 ω. When working under load. the rms voltage across the alternating source is 442 v.  The rms current will be  8.54 A

AC stands for “Alternating Current,” meaning voltage or current that changes polarity or direction, respectively, over time. AC electromechanical generators, known as alternators, are of simpler construction than DC electromechanical generators.

RMS or root mean square current/voltage of the alternating current/voltage represents the D.C current/voltage that dissipates the same amount of power as the average power dissipated by the alternating current/voltage. For sinusoidal oscillations, the RMS value equals peak value divided by the square root of 2.

I (RMS) = RMS voltage / [tex]\sqrt{R^{2}+ X_{L} { ^{2} }[/tex]

           =  442 / [tex]\sqrt{29.4^{2} + 42.6^{2} }[/tex]

           = 442 / [tex]\sqrt{864.36 + 1814.76}[/tex]

           = 442 / [tex]\sqrt{2679.12}[/tex]

           = 8.54 A

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The average emf induced is "ωBA volts".if we know the value of ω, B & A we can easily calculate the value. Faraday's law of induction determines the typical emf produced by spinning a coil's turn in the earth's magnetic field.

Discussion:

According to this equation, the magnetic flux through a closed loop changes at a time rate equal to the negative of the induced emf in the loop.

Calculation:

This flux value is constant and no electromagnetic field (EMF) is produced when the loop is positioned in the earth's magnetic field without moving. When the magnetic field starts rotating, the area and magnetic field strength stay constant, but the angle between the plane of the area's normal and the field lines continues to alter or fluctuate. Due to the magnetic flux's relationship to angle and the time dt at which an average emf is produced in the coil, this results in a change in the net magnetic field across the loop.

The flux φ = BAcosθ

E = - dφ/dt = - d(BAcosθ)/dt

As "B" & "A", both are constant

so, E= - BAd(cosθ)/dt

where, θ = the function of time

θ = ωt

where, ω = angular frequency (rad/sec)

E = -BAd(Cosωt)/dt

E = - (-ω)BA Sinωt = ωBA Sinωt

E = ωBASinωt

E = -d(BACosθ)/dt

The plane is now parallel to the field, and the normal is now perpendicular to the field.

θ=90°

Therefore, E= ωBASin90° = ωBA(1) = ωBA

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A circuit with an impedance of 5 ohms and a voltage of 100 volts has a current flow of 20 A.

The expression of an electronic component, circuit, or system's resistance to alternating and/or direct electric current is called impedance, indicated by the letter Z. Resistance and reactance are two distinct scalar (one-dimensional) phenomena that combine to form impedance, a vector (two-dimensional) variable.

[tex]Z^{}[/tex] = [tex]\frac{V}{I}[/tex]

(for a pure resistor where Z=R,preserving the form of the DC Ohm's law).

[tex]I=\frac{V}{Z}[/tex]

[tex]I = \frac{100}{5}[/tex]

I = 20 A

Therefore, A circuit with an impedance of 5 ohms and a voltage of 100 volts has a current flow of 20 A.

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Answer:

Giant impacts in its early history may have torn away much of its original crust and mantle.

So Mercury has a giant iron core, but why?

There are three general ideas.

1. Mercury was once the core of a gas giant that vaporized when the Sun became a fully-fledged star. This gas giant was probably more like Uranus or Neptune than Jupiter or Saturn.

There are significant issues here, especially that Mercury's existing surface has been exposed to space since the solar system's initial beginnings. On Mercury, remnants of the first massive bombardment have been found.

2. Mercury formerly had a deeper mantle and was a bigger terrestrial planet. During the early history of the solar system, a dwarf planet made a massive impact that robbed the planet of its mantle.

The existing surface of Mercury has been exposed to space since the very beginning of the solar system, which raises major issues once more.

Due to the factors in explanation 1, characteristics from the first significant bombardment have been found on Mercury. The quantity of low temperature volatiles that are trapped and sometimes sublimate out of the crust, causing hollows, is also a major issue. By such an impact, these low temperature volatiles—such as sodium, sulphur, magnesium, etc.—would have been completely pushed out.

3. A mostly iron-rich body developed, and "rock steam"—a gaseous mixture of atomic oxygen and silica—condensed and accreted onto it from the protoplanetary disk near the Sun. Small rock particles with lower temperature volatiles were subsequently formed into a crust. Additionally, it appears that iron was concentrated in the inner region of the protoplanetary disk by the Sun's early, extremely powerful magnetosphere.

Whilst there are a few minor issues with this, this appears by far the most likely scenario.

Its crust and mantle may have been significantly altered during its early history by massive collisions.

The extremely hot and dense core of Earth is called the core. Under the mainly solid mantle and the chilly, brittle crust is the ball-shaped core. The radius of the core is about 3,485 kilometers, and it can be located around 2,900 kilometers (1,802 miles) beneath the surface of the Earth (2,165 miles). Earth is more ancient than the core.

Approximately 4.5 billion years ago, Earth was a uniform ball of hot rock. The ball warmed up considerably more due to radioactive decay and residual heat during planetary formation. After roughly 500 million years, the temperature of our new planet reached 1,538 degrees Celsius (2,800 degrees Fahrenheit), which is the temperature at which iron melts. The iron catastrophe refers to this critical moment in Earth's history.

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Polynomials can be classified based on the number of terms is contains which may be monomial, binomial, or trinomial.

Polynomials are algebraic expressions that contains a constant that is multiplied by one or more variables.

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The complete question:

Classify each polynomials based on the number of terms it contains.

-2x^2-x+3.5

10xyz^3

-x^2y^2+2y

8x^2+0.25

x^3y^4+2x^2y-3z

Heat is transferred from the sun-warmed surface of the earth to the cooler overlying troposphere via conduction.

Conduction, convection, latent heating, and water phase transitions all help to carry heat from the Earth's surface, which has been warmed by the Sun, to the cooler troposphere above.

Latent heat flux is the worldwide transfer of latent heat energy via water and air currents. Here, we demonstrate how air circulation transports latent heat energy horizontally to cooler regions, where it condenses into rain or is deposited as snow, releasing the heat energy that was previously trapped there.

When air is heated from below by sunshine or by coming into contact with a warmer land or sea surface, convection occurs and the air below becomes less dense than the air above.

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Atmospheric pressure is about 100000 pa. at h ≈ 10 m depth in water does this pressure double

Water pressure is the result of the weight of all the water above pushing down on the water below. As you go deeper into a body of water, there is more water above, and therefore a greater weight pushing down. This is the reason water pressure increases with depth.

The atmospheric pressure at a point is defined as the force acting normally on a unit area around that point, due to the total height of the air column of the atmosphere above it.

Pressure in depth = Atmospheric pressure + (rho) * g * h

where

rho = density of water

g = acceleration due to gravity

h = depth in water

P = Po + rho * g * h

2 * [tex]10^{5}[/tex] =  [tex]10^{5}[/tex]  + [tex]10^{3}[/tex] * 9.8 * h

h = 10.20 m

h ≈ 10 m

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Answer:

1. A proton's magnetic moment arises from a fundamental quantum property called spin, which causes the proton to behave as a tiny bar magnet with a north and a south pole. When placed in an external magnetic field, the proton's spin can either align with the field or flip to orient itself against the field

2. The force can change the direction (velocity) of the proton but not its speed (magnitude).

The  research team should compare all their test results along with other kinds of similar personality tests to know if they will have similar type of results.

It is known to be Myers-Briggs Personality Type Indicator and this is said to be a kind of a self-report inventory that is made to know a person's personality type, along with their strengths, and preferences.

Note that the questionnaire was made or created by Isabel Myers along with her mother Katherine Briggs and it is one that is based on their work with the use of Carl Jung's theory of personality types.

Hence, The  research team should compare all their test results along with other kinds of similar personality tests to know if they will have similar type of results.

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A child has an ear canal that is 1. 3 cm long. Sound frequencies in the audible range for the child to have increased hearing sensitivity is 6600 Hz to 19,800 Hz

The shape of the human ear is similar to a pipe that has a closed end and other end is open. Hence,

λ = 4L where L is the length of child's ear

Wavelength, λ = 4 × Length of the ear of the child

                     λ = 4 × 0.013m

                     λ = 0.052m

Frequency is the no. of oscillations per unit time.

The frequency of the sound, ν = c/λ

where c is the speed of sound i.e. 343 m/s

           λ is the wavelength of sound

The child's audible range is equal to

ν = 343/0.052

ν = 6600Hz

We can also say that, ν is 13200 Hz or 19,800 Hz.

In general, the audible range of frequency for human ear is 20Hz to 20,000Hz.

Hence, sound frequencies in the audible range will the child have increased hearing sensitivity is 6600Hz to 19800 Hz.

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(a) The mass of the block is 5.1 kg.

(b) The magnitude of the normal force of the block is 46.98 N.

(c) The maximum static frictional force between the block and the incline is 23.49 N.

(d) The gravitational force parallel to the plane is 17.1 N.

(e) The block will not slide after being placed on the incline since the parallel force is less than the maximum static frictional force.

(f) The acceleration will be in the direction of the static frictional force.

The given parameters in the question;

The mass of the block is calculated as follows;

W = mg

where;

m = W/g

m = (50) / 9.8

m = 5.1 kg

Fₙ = mg cosθ

Fₙ = W cosθ

Fₙ = 50 x cos(20)

Fₙ = 46.98 N

Fs = μs(Fₙ)

Fs = 0.5 x 46.98 N

Fs = 23.49 N

F = W sinθ

F = 50 x sin(20)

F = 17.1 N

F(net) = F - Fs

F(net)  = 17.1 N - 23.49 N = -6.39 N

Thus, the block will not slide after being placed on the incline since the parallel force is less than the maximum static frictional force.

a = F(net)/m

a = -6.39/5.1

a = -1.25 m/s²

The acceleration will be in the direction of the static frictional force.

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The components that are a possible representation of vector w if the magnitude of vector -3w is ||-3w||=15 are:

From the question, we were given:

|-3w| = 15

3|-w| = 3|w| = 15

Hence:

|w|  = 15/3

|w| = 5

If vector w is represented by <-3,4>, then:

 [tex]\sqrt{(-3)^2 + (4)^2} \\\\\\\sqrt{25} = 5[/tex]

If vector w is represented by <0,-5>

 [tex]\sqrt{(0)^2 + (-5)^2} \\\\\\\sqrt{25} = 5[/tex]

Therefore, The components that are a possible representation of vector w if the magnitude of vector -3w is ||-3w||=15 are:

See full question below

Which components are a possible representation of vector w if the magnitude of vector -3w is ||-3w||=15?

<1,-9>

<-3,4>

<4,5>

<-5,-3>

<0,-5>

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The wavelength of the emitted photon is([tex]\lambda[/tex])= 690nm

To calculate the wavelength of the photon we are using the formula,

[tex]\triangle E= \frac{h\times c}{\lambda}[/tex]

Or,[tex]\lambda= \frac{h\times c}{\triangle E}[/tex]

We are given here,

[tex]\triangle E[/tex]= The energy difference between the two levels = 1. 8 ev= [tex]1.8\times 1.6 \times 10^{-19}[/tex] C.

h= Planck constant = [tex]6.626\times 10^{-34}[/tex] Js.

c= speed of light = [tex]3\times10^8[/tex] m/s.

We have to find the wavelength of the emitted photon =[tex]\lambda[/tex] m.

Therefore, we substitute the known parameters in the above equation, we can find that,

[tex]\lambda= \frac{h\times c}{\triangle E}[/tex]

Or,[tex]\lambda= \frac{6.626\times 10^{-34}\times 3\times 10^8}{1.8\times 1.6 \times 10^{-19}}[/tex]

Or,[tex]\lambda= 690\times 10^{-9}[/tex] m

Or,[tex]\lambda[/tex]=690 nm.

From the above calculation we can conclude that the wavelength of the emitted photon is 690nm.

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while the siren produces waves of constant frequency, as it approaches us the observed frequency increases and our ear hears a higher pitch. After it has passed us and is moving away, the observed frequency and pitch drop this effect is known as Doppler effect.

The characteristic sound of a motorcycle buzzing by is an example of the Doppler effect. Specifically, if you are standing on a street corner and observe an ambulance with a siren sounding passing at a constant speed, you notice two characteristic changes in the sound of the siren. First, the sound increases in loudness as the ambulance approaches and decreases in loudness as it moves away, which is expected. But in addition, the high-pitched siren shifts dramatically to a lower-pitched sound.

what is Doppler effect?

The Doppler effect is an alteration in the observed frequency of a sound due to motion of either the source or the observer. Although less familiar, this effect is easily noticed for a stationary source and moving observer.

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Answer:

The tension in the wire, the wave's speed, its frequency, and its average power are used to calculate the wave's amplitude.

To find the answer, we have to know about the simple harmonic motion.

                                 P = (¹/₂)(T/v²)(ω²)(A²)(v)

                                 P = (¹/₂)(T/v)(ω²)(A²)

                                 P = (¹/₂)(T/v)(2πf)²(A²)

where; U is the average power of the wave, T is the tension e wire, ω angular frequency of the wave, A is amplitude of the wave, v is the speed of the wave and f is frequency of the wave.

Thus, the tension in the wire, the wave's speed, its frequency, and its average power are used to calculate the wave's amplitude.

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Answer:

[tex]1275 kg*m/s[/tex]

Explanation:

We'll use the momentum equation:

[tex]p=mv[/tex]

where:

p = momentum

m = mass

v = velocity

Since we're doing the magnitude of momentum of the system, we'll add the mass of the cyclist and the mountain bike together:

[tex]70.0 kg + 15.0kg=85.0 kg[/tex]

Given that, we can now substitute our given values into the momentum equation:

[tex]p=mv\\p=85.0kg*15.0m/s[/tex]

Our final answer is:

[tex]p= 1275 kg*m/s[/tex]