A series lr circuit contains an emf source of 14 v having no internal resistance, a resistor, a 34 h inductor having no appreciable resistance, and a switch. If the emf across the inductor is 80% of its maximum value 4. 0 s after the switch is closed, what is the resistance of the resistor?.

The length of the cable, 3000 ft

we know,

[tex]y=\frac{4h}{l^{2} } x(l-x)[/tex]

where,

h, maximum height= 15 ft

l= span = 300 ft

Therefore,

[tex]y=\frac{4h}{l^{2} } x(l-x)[/tex]

[tex]y=\frac{4*15}{300^{2} } x(300-x)[/tex]

[tex]\int\limits {y} =\int\limits^3_0 {\frac{4*15}{300^{2} } x(300-x)} \, dx[/tex]

Therefore, The length of the cable, 3000 ft.

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The frequency of green light is 6 x 10¹⁴ Hz then its wavelength will be 500nm.

The frequency of a repeated event is its number of instances per unit of time. In some cases, it is also referred to as temporal frequency or ordinary frequency to underline differences with spatial and angular frequencies, respectively.

As we know,

Speed of light = Frequency × wavelength

Speed of light (c)=3×10⁸ m/s

Frequency (f)=6×10¹⁴ Hz(Given)

Wavelength (λ)=?

Therefore,

λ= f × c

​λ   = 6×10¹⁴× 3×10 ⁸

λ   = 0.5×10⁻⁷

λ = 500nm

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Answer:

[tex]\huge\boxed{\sf R = 50\ ohms}[/tex]

Explanation:

Equivalent Resistance = [tex]R_T[/tex] = 150 Ohm

Resistance of one lamp = R = ?

[tex]R_T[/tex] = R + R + R

150 = 3R

Divide 3 to both sides

50 ohms = R

R = 50 ohms

[tex]\rule[225]{225}{2}[/tex]

The work done by gravity= 163.17 J, change in kinetic energy=186.2J, the final velocity=93.67m/s

define kinetic energy ?

In physics, an object's kinetic energy is the energy it has as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a certain velocity. The body retains its kinetic energy after gaining it during acceleration until its speed changes. The body does the same amount of work while slowing down from its current pace to rest. Formally, kinetic energy is any term in a system's Lagrangian that contains a time derivative.

a) work done by the gravity was

w=mg x (5.55) sin 17.5

=10x9.8x5.55x0.300

=543.9x0.300

=163.17 J

therefore the work done by gravity was 163.7 J

b)change in kinetic energy

Δu=(0.4)x(10)x(9.8)x(cos17.5)x(0.005)

=0.4x10x9.8xcos17.5x0.005

=0.4x10x9.8x0.95x0.005

Δu=186.2 J

c) speed of the cart after being pulled by the crate was

mass of the crate=10kg

initial speed=1.50

force=100 N

coeff. kinetic energy=0.4

distance=5.55m

frictional force N=mgcosФ

=0.4x10x9.8xcos17.5

=8.58

effective force = (100-8.58)

=91.42

acceleration=91.42/10

=9.142

the final velocity=u^2+2as

=1.5^2+2 (9.142)5

2.25 +2(45.71)

2.25+91.42

=93.67

therefore the final velocity=93.6m/s

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The effect that distance has on the force of gravity is that increasing the distance between two objects decreases the gravitational force and is denoted as option C.

This is a term which is referred to as the universal force of attraction acting between all matter and the formula is F = Gm1m2/r² .

The force of gravity has an inverse relationship with the distance of the objects. This therefore means that increasing the distance between two objects decreases the gravitational force and vice versa which is therefore the reason why option C was chosen as the correct choice.

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Suppose we see evidence of helium gas in the atmosphere of an exoplanet, the true statements is A."it has more surface gravity than Earth, or is much colder"

An exoplanet, also known as an extrasolar planet, is a planet that exists outside of the Solar System. The first possible evidence of an exoplanet was discovered in 1917, but it was not recognized. The first detection confirmation occurred in 1992. A different planet, first discovered in 1988, was confirmed in 2003.

Similarly to how we continue to explore the unknowns of the world in search of resources to meet our needs, research into new materials and species will all benefit the most common problems we face, such as energy resources, medical needs, and cures for incurable diseases.

Before we knew about exoplanets, we spent all of our research time learning about our own solar system and how the planets formed. Exoplanet observations allow us to determine whether or not we actually understand those processes, even in our own solar system.

It is important to know that once helium is released into the atmosphere, it typically rises till it escapes into the space. In this situation, it illustrates that exoplanet will have more surface gravity.

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The time taken for the cork to reach the shore is 85.44 s.

Write down the wave function as y(x,t)=Asin(kxt+) to determine a sinusoidal wave's amplitude, wavelength, period, and frequency. The equation itself can be used to read the amplitude, which equals A. The angular frequency (T=2) can be used to calculate the wave's period.

Frequency of oscillation, f = 2hz

Wavelength of oscillation, λ = 7.90 cm

Distance of the cork from the shore, d = 13.5 cm

v = f × λ

v = 2 × 0.079

v = 0.158 m/s

time = distance / speed

time = 13.50 / 0.158

time = 85.44 s

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In other words, you need as much mirror as your height to see a reflection of yourself in a flat mirror. A correctly positioned 3 foot-long mirror is required for a 6 foot-tall guy to see his whole reflection.

What is mirror?
A thing that reflects images is a mirror as well as looking glass. When focused through an eye or camera lens, light that reflects off a mirror will reveal an image of what is in front of it. Mirrors reflect light from an equal but opposite angle, reversing the direction of the image. This enables the viewer to see themselves, objects behind them, and even objects that are in their line of sight but out of it, like objects that are around a corner, but are at an angle from them. Natural mirrors have been around since the beginning of time, such as the water's surface, but for thousands of years, people have been making mirrors from a variety of materials, including stone, metals, and glass.

Ray diagrams were explained and demonstrated for use. The location along a mirror that a person must look in order to see an image of themselves can be determined using ray diagrams. So it is possible to utilize ray diagrams to calculate what area of a plane mirror must be used in order to display an image.

The mirror must be at least half your height in size in order to show your entire image. It really is that easy mirror.

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The focal length of the lens is known to be 35 mm, and it is implied that the formed image must be on the opposite side of the object; as a result, the image is real and the distance d is positive.

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The frequency is given by f = (1/(2))k/m.

While moving in the opposite direction, the acceleration, a = -2x, is proportional to the displacement. Motion that is accelerated is simple harmonic motion. If an item moves in a simple harmonic manner, a force must be exerted on it. F = ma = -m2x is the formula for force.

The greatest displacement or distance that a point on a wave or vibrating body may travel in relation to its equilibrium position It is equivalent to the length of the vibration path divided in half.

The height of a wave's crest or trough measured from the center line (or the stationary position) is known as the amplitude ().

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Answer:

1.) Cation

2.) Ion

3.) Anion

Explanation:

The window space has an acoustic power of 160 or less. The quantity of energy that is transported or transformed through time is referred to as power in physics

Force is the principal result of an interaction between two things, whereas power is a measurement of energy consumed over time (energy), of which force is a component. Power and push can both be measured and expressed, but only a force is a true physical phenomenon.

The capacity to influence your surroundings is referred to as personal power. Reward power, coercive, legal power, formal authority, and referent power are the five categories of power that can be used to achieve this.

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The correct relation will be:

(a) K1 = K2

(b) K1 < K2

According to the question,

Potential energy be "P".

Kinetic energy be "K".

(a) Work done towards both the block will be similar.

So,

P₁ = P₂

K₁ = K₂

(b) We know,

α = F/M

or V = a x t

Now,

Kinetic energy = (1/2)mv²

K = 0.5 * M * V²

K = 0.5 * M * F²/M² * t²

K = 0.5 * F² * (t²/M)

Therefore, the kinetic energy of 1 is smaller than kinetic energy of 2 as the force and time will be same. So K of the smaller mass will be greater than the larger mass.

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The maximum acceleration that the car can have is 11.17 m/s² and the maximum acceleration the car can have while driving downhill 5.4 m/s².

(a) Mass of the car = m

Acceleration due to gravity = g

Angle of inclination = θ = 21.7°

Acceleration of the car = a

Coefficient of static friction = μ = 0.880

Force pushing the hill is the maximum static force = μ×m×g×cosθ

Force down the hill = m×g×sinθ

Total force = m × a

Thus, equating all the force,

= m × a = (μ×m×g×cosθ) - (m×g×sinθ)

= a = [(μ×m×g×cosθ) - (m×g×sinθ) ] / m

= a = (μ×g×cosθ) - (g×sinθ)

= a = g × [(μ×cosθ) - (sinθ)]

= a = 9.8 × [ (0.88 × cos 21.7) - (sin 21.7)]

= a = 9.8 × [ (0.88 × - 0.96) - 0.29 ]

= a = 11.17 m/s²

(b) While going down the hill, gravity and friction act in the same direction:

Thus, equating all the force,

= m × a = (μ×m×g×cosθ) + (m×g×sinθ)

= a = [(μ×m×g×cosθ) + (m×g×sinθ) ] / m

= a = (μ×g×cosθ) + (g×sinθ)

= a = g × [(μ×cosθ) + (sinθ)]

= a = - 5.4 m/s²

The sign is negative as the car is going downhill.

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The wave's frequency, f=0.5Hz or 1/s, should be regarded as the waves with a wavelength = 200 cm.

Wavelength is the separation between corresponding points (adjacent crests) in successive cycles of a waveform signal traveling through space or over a wire. In wireless systems, the length is typically expressed in meters (m), centimeters (cm), or millimeters (mm).

Since the wavelength is 200 cm or 2m

Also we know that

frequency is reciprocal of wavelength

So,

f=1/2

f=0.5Hz

The wavelength is a crucial characteristic since it governs the nature of the light. Green light spectrum that is distinct from both of them, while red light has a wavelength that is distinct from both blue and green light.

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object 1 and object 2 have the same mass and are moving at the same speed. TRUE

The given statement is true because the momentum of an object is defined as mass multiplied by velocity. And both of these objects have the same mass which means the first condition is satisfied and secondly they have the same velocity too. Thus the second condition is also satisfied.

Thus we can say that the momentum of both the objects will be the same.

As momentum depends on both velocity and the direction of the body's motion, it is quantified by "mass velocity". Since velocity is a vector and mass is a scalar, momentum is a vector quantity. Mass times speed equals momentum. p = mv.

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If the clock is running too fast, the weight needs to be moved down in order to increase the period and decrease the angular frequency, option B.

For small maximum distance moved by a point or wave measured from it equilibrium position, the period of a physical pendulum depends only on the immobility of the body around the pivot point and the distance from the center of mass of the body.

To slow down a fast clock in this experiment, the weight is moved down which increases at the distance between the pivot and the center mass (period) and decreases the angular velocity/frequency.

The complete question is:

A simple pendulum is used as the timing element in a clock as shown. an adjustment screw is used to make the pendulum shorter (longer) by moving the weight up (down) along the shaft that connects it to the pivot.

1)if the clock is running too fast, the weight needs to be moved

a. Up

b. Down

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Assume that the electric field between two points that are 4 meters apart has a 14 volt/m potential. The electric potential between the two points is 460 w (in volts).

V =Er

= 67 X 13

V =871 volts

I =q/t=8/2

I=4 Amp

P=VI

230 X 2

P=460 W

A unit of electric charge must be moved from a reference point to a specific point in an electric field, and this amount of work energy is known as the electric potential. Against an electric field, the amount of work required to move a unit charge from one point to another is known as electric potential. Although any location outside the range of the electric field charge can be used, Earth is typically used as the reference point. The external effort required to move a charge from one location to another in an electric field is known as an electric potential difference, or voltage. A test charge that has an electric potential difference of +1 will experience a change in potential energy.

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Fault lines, also known as geological faults, are fractures in the rock blocks that make up the earth's surface, causing them to suffer relative displacements in their structures. These fractures are almost always formed by the action of internal relief agents and can manifest both in areas under strong tectonism and in more stable regions.

In other words, we can say that the fault lines are the crust of the lithosphere that fractured along the plate boundaries and grooves.

Oceanic lithosphere is destroyed at “Convergent Boundaries

Convergent boundaries are places where two tectonic plates meet each other.

The crust is the outermost layer of the earth. It is divided into many plates that move over the mantle.

These plates are limited by three types of ridges or borders that differ in the movement they produce.

Therefore, lithosphere occur at convergent boundaries where oceanic plate moves and is forced to sink due to the high gravitational energy into the mantle and also because the oceanic plate has density this zones usually have high volcanism and earthquake.

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The answer to this question will be while i < D (length).

The norm of residuals is a degree of the goodness of healthy, in which a smaller price shows a better match than a bigger price. it's far calculated the usage of the norm function, norm(V,2), where V is the vector of residuals.

The residual for every observation is the distinction between predicted values of y (dependent variable) and discovered values of y. Residual=actual y value−expected y fee,ri=yi−^yi. In linear regression, a residual is a difference between the actual price and the price anticipated with the aid of the version (y-ŷ) for any given point.

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In scenario a, if visible light has a wavelength of 690.4 nm, its frequency is 434.53 THz, its energy per photon is 28.79 YJ and its color is red.

v = ν λ

v = Wave speed

λ = Wavelength

ν = Frequency

λ = 690.4 nm

Since the wave considered here is visible light,

v = c = 3 * 10⁸ m / s

ν = v / λ

ν = 3 * 10⁸ / 690.4 * 10⁻⁹ m

ν = 434.53 * 10¹² Hz

ν = 434.53 THz

E = h ν

E = Energy

h = Planck's constant

ν = Frequency

h = 6.626 * 10⁻³⁴ J s

E = 6.626 * 10⁻³⁴ * 434.53 * 10¹²

E = 2879.19 * 10²² J

E = 28.79 * 10²⁴ J

E = 28.79 YJ

Therefore, if visible light has a wavelength of 690.4 nm, its frequency is 434.53 THz, its energy per photon is 28.79 YJ and its color is red.

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Threshold braking is when you squeeze the brake pedal until just before the wheels lock then ease off the pedal then squeeze again repeating until you've reduced your speed enough.

Push to lower the nose of the car, push more if needed, and loosen towards the end of the stop. The point is that the transition is slowly pushed down and slowly released upwards. To stop faster, we all do the same thing just a little bit faster.

Limit braking or limit braking is the most commonly used driving technique in motorsports but it is also practiced in road vehicles to use the brakes to slow the vehicle to the maximum possible extent. Progressive braking is a method of using variable braking force to slow the car down at the onset of light braking increase braking force to slow the car and then stop braking lightly.

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Answer: The answer options are A Traditional B ABS C Power D Threshold. The correct answer is Threshold braking

The effective spring constant for the web, which behaves like a spring, is 20N/m

The speed of the train is,

v=80 km/h

 = 80 km/h(1000m/1km)(1h/3600s)

 =22.2 m/s

From the law of conservation of energy, the initial kinetic energy of the train should be converted to the elastic potential energy of the web before stopping the train.

[tex]K_{train} = U_{web}[/tex]

1/2 * m * v² = 1/2 * k * x ²

k = (m * v ²)/(x ²)

= ((10⁴kg) * (22.2m / s) ²)/((500m) ²)

= 19.7N / m = 20N / m

One of the four temperate seasons, commonly referred to as spring or springtime, spring follows winter and comes before summer. There are several technical definitions of spring, but how the term is used locally depends on the local climate, culture, and customs. Autumn occurs in the Southern Hemisphere when spring does in the Northern Hemisphere, and vice versa.

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Very accurate measurements over a wide range of pressure have been made for large number of real gases.

The product of P cross product with V is not constant for any gases.

The real gases the dependence shows the deviation in partial pressures of individual gas molecules and azeotropes.

The curves extrapolated with compressibility factor with the constant product for some gases if pressures are very low.

[tex]\alpha =\frac{Pv}{RT}\\ \\\alpha =\left \{ {{1 - ideal} \atop {\neq 1-real}} \right.[/tex]

From Charles law the volume approaching to zero means pressure attaining infinite value. The compressibility factor is an index of deviation from ideality.

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The speed of the sound depends on the density and the elasticity of the medium through which it travels.

Medium pressure and temperature Sound waves move more quickly at higher temperatures because molecular vibrations happen more frequently there. At constant temperature, the pressure of a medium has no effect on the sound's speed.

The density and elasticity of the medium through which sound travels affect how fast it travels. In general, sound moves more quickly through solids and gases than through liquids. Sound travels through a medium more quickly the more elastic it is and the less dense it is.

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The net force on the sled which is pulled by the tooth children is 14 Newton in the east direction.

Two children are pulling the sled in opposite direction because of the disagreement.

One of the child is pulling the sled with a force of 200 Newton in the east direction and the other is pulling the sled with the force of 175 Newton in the West direction and affection force of 10 Newton is existing between the slid and the surface.

The net force on the slide can be given by,

F = 200-150-10

F = 40N

So, the net force on the slide is 40 Newton in the east direction.

Here. we directly subtracted the force because the direction of the forces was opposite of each other and the friction also acts in the direction opposite of the motion of the object.

So, the net force on the sled is 40 Newton.

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The response of "A shell being fired at the bigger angle" fits the supplied statement.

In plane geometry, an angle is a shape made up of two directions or lines that share an endpoint. The English word "angle" derives from the Latin language "angulus," which means "corner." The vertex and the 2 rays are referenced to as the sides of an angle, respectively, and are the shared termini of two rays.

Angle names can be given in one of three ways. An angle can be identified through its vertex, by its three points (the vertex must be the middle point), or by a sequence of letters inscribed within the angle's aperture.

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Therefore, Europa lies outside the habitable zone of the sun and is therefore not a place where life can exist.

What is habitable zone?

The habitable zone gradually takes on a new shape. How much starlight can warm a planet determines its shape. The physical size and luminosity of an aging star increase in all directions, and as they do, so does their heat, which moves outward with them.

What is sun stage?

The Sun is currently and will remain for the next 4-5 billion years a main-sequence star. It will then develop and cool to become a red giant before shrinking and reawakening to become a white dwarf. The white dwarf star will gradually cool down once its nuclear fuel has run out over many billions of years.

When hydrogen in the core transforms into helium, the density of hydrogen begins to decline over time. This causes the rate of nuclear reactions to slow down in the core, which lowers radiation pressure.

By warming and contracting to maintain the balance while gravity pulls inward, the core compensates. The sun's temperature starts to rise as a result. The brightness of the sun also rises when the temperature starts to rise.

As the habitable zone expands and moves away from the sun, it is affected by the sun's brightness over time.

Earth has been habitable for 4 billion years because its surface temperatures allow liquid water to exist. 

Titan is colder than Earth and lacks liquid water that is stable. Titan is not a place where people can live.

The habitable zone of the sun extends only as far as Mars. The surface of Mars is inhospitable.

Europa is heated by the tides, which permits liquid water to exist beneath its ice-covered surface.

Therefore, Europa lies outside the habitable zone of the sun and is therefore not a place where life can exist.

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When two surfaces glide past one another, a force known as friction is created.Friction forces that oppose the motion of moving objects cause them to expend energy and slow down.

An object rolls on a surface, creating rolling friction. When two surfaces rub against one another, sliding friction occurs. The deformation of surfaces causes rolling friction. Because tiny surfaces connect, sliding friction occurs.

Therefore, When the child pushes themselves down the slides. As the child is in motion as they are sliding down.

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Answer:When the child pushes themselves down the slides.

Explanation: i think im not sure