When the magnetic flux through a loop changes, which is always true about the induced current?

Answer:

v = λ f      wavelength * frequency

v = λ / P

v = 4.5 n / .007 sec = 643 m/s

The maximum kinetic energy is 0.91 eV

A Work Function of a Metal is the minimum energy required to liberate an electron from a metal surface. From the formula;

hF = hf + E

Given that a Barium has a work function of 2.48eV. What is the maximum kinetic energy ?

Convert eV to Joule by multiplying by 1.6 x [tex]10^{-19}[/tex]

hf = 2.48 x 1.6 x [tex]10^{-19}[/tex]

hf = 3.968 x [tex]10^{-19}[/tex] J

If the metal is illuminated by UV light of wavelength 365nm,

E = hF = hc/λ

Where

Substitute all the parameters

hF = (6.6 x [tex]10^{-34}[/tex] x  3 x [tex]10^{8}[/tex]) / 365 x [tex]10^{-9}[/tex]

hF = 1.98 x [tex]10^{-25}[/tex] /  365 x [tex]10^{-9}[/tex]

hF = 5.42 x [tex]10^{-19}[/tex] Joule

The maximum kinetic energy will be

hF = hf + E

Make E the subject of formula

E = hF - hf

E = 5.42 x [tex]10^{-19}[/tex] - 3.968 x [tex]10^{-19}[/tex]

E = 1.452 x [tex]10^{-19}[/tex] J

Convert Joule back to eV by dividing by 1.6 x [tex]10^{-19}[/tex]

E = 1.452 x [tex]10^{-19}[/tex] / 1.6 x [tex]10^{-19}[/tex]

E = 0.9075 eV

Therefore, the maximum kinetic energy is 0.91 eV approximately

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Answer:

=> Black colour do not reflect the wavelength of light and is a good emitter of heat . This, black is a good absorber of radiation.

Answer:

Black coloured objects absorb all the wavelengths of light and do not reflect any of them. Therefore, it looks black in colour and is considered to be a good absorber and a good emitter of heat. On the other hand, white coloured objects reflect all the light that falls into it and therefore they look white

Answer:

The Object distance is 53.125cm. So the right option will be Option (c)

Explanation:

The converging lens has focal length positive, so it means:

            f=17cm

As the real image is formed so the distance of the image will be taken as positive. Let it is represented by q, So:

           q=25cm

Let the distance of object is p, it will obtained from the following formula:

The input voltage is 120 V and the transformer is a step up transformer due to increase in the voltage induced in the secondary coil.

The input voltage of the transformer is the voltage of the primary coil and it is calculated as follows;

Ns/Np = Es/Ep

where;

2X/X = 240/Ep

2 = 240/Ep

Ep = 240/2

Ep = 120 V

Thus, the transformer is a step up transformer due to increase in the voltage induced in the secondary coil.

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The air pressure normally drops before a cold front passes and rises after a cold front passes.

When a warm, lighter air mass pushes under a cold, dense air mass, the warm air is forced to rise, forming a cold front. The warm air at the surface is replaced by the cold air as it moves forward. As the moisture in the warm air mass rises, cools, and condenses, rain and even thunderstorms might develop. The winds will often change direction during a cold frontal passage from the south to the west or north. It is probable that cold, fair weather will continue when the front passes.

The sort of air mass going in affects the temperature behind a cold front. During the winter, a polar air mass will bring in frigid air, and during other seasons, cool air. Bitter air from the Arctic will be present.

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Explanation:

i think it give out energy when it melts

(1) The critical angles for the fused quartz is 44⁰,

(2) The critical angles for the polystyrene is 39⁰.

(3) The critical angles for the sodium chloride is 41⁰.

In optics, the critical angle is the topmost angle at which a shaft of light traveling in one transparent medium can strike the boundary between that medium and another with a lower refractive indicator without being fully reflected within the first

Critical angles for the different medium.

θ[tex]=sin^{-1}\frac{n_{2} }{n_{1} }[/tex]

where;

[tex]n_{2}[/tex] is the refractive index of air = 1

[tex]n_{1}[/tex] is the refractive index of the given substances.

Refractive index of quartz glass = 1.46

Refractive index of polystyrene = 1.59

Refractive index of sodium chloride = 1.54

Critical angles for quartz glass:

[tex]$\theta_{\text {crit }}=\sin ^{-1} \frac{1.00029}{1.46}\\$[/tex]

[tex]$\theta_{\text {crit }}=44^{o}$[/tex]

Critical angles for polystyrene

[tex]$\theta_{\text {crit }}=\sin ^{-1} \frac{1.00029}{1.59}\\\\[/tex]

[tex]\theta_{\text {crit }}=39^{\circ}[/tex]

Critical angles for Sodium Chloride

[tex]$\theta_{\text {crit }}=\sin ^{-1} \frac{1.00029}{1.54}\\[/tex]

[tex]\theta_{\text {crit }}=41^{o}[/tex]

Thus, the critical angles for the quartz glass is 44⁰, the critical angles for the polystyrene is 39 ⁰ and the critical angles for the sodium chloride is 41⁰.

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I understand that the question you are looking for is:

"For light of wavelength 589 nm, calculate the critical angles for the following substances when surrounded by air.

(a) Fused Quartz

(b) Polystyrene

(c) Sodium chloride"

Answer:

10800 kJ

Explanation:

1 watt = 1 Joule /sec

1500 w = 1500 j/sec         2 hours = 7200 sec

1500 j/sec * 7200 sec = 10 800 000 j   = 10 800 kJ

The scales readings are 300 N for each of the scale.

The weight of an object is the force acting on the object due to gravity.

Weight is a vector quantity because it varies from place to place due to difference in acceleration due to gravity and it is measured in Newton (N).

The total weight of the person is supported by the two legs and if the person stand on a level ground, the weight will be evenly distributed and each scale will carry half of the person's weight.

The reading of each scale due to the weight of the person is calculated as follows;

Reading of each scale = total weight / 2

Reading of each scale  = 600 N/2

Reading of each scale  = 300 N

Thus, the scales readings are 300 N for each of the scale.

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Potential energy is position relative, and kinetic energy is motion relative. The primary relationship between the two is their ability to transform into each other. In other words, potential energy transforms into kinetic energy, and kinetic energy converts into potential energy, and then back again.

Potential energy defined as :

The energy stored in a body due to either its position or change in shape is known as potential energy. Water stored in a reservoir is an example of potential energy.

PE=mgh

where,

PE is the potential energy

m is the mass of the body

g is the acceleration due to gravity

h is the height above the surface of the earth

Kinetic energy is defined as :

Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles. Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.

Kinetic Energy Formula:

For the Kinetic formula, Ek, is certainly the energy of a mass, m, motion, of course, is v2.

KE = [tex]\frac{1}{2} mv^{2}[/tex]

KE = Kinetic energy

m = mass of the body

v = velocity of the body

What are the similarities between potential energy and kinetic energy?

One of the most important similarities between potential energy and kinetic energy is that they can both be converted into each other's form of energy. When a force is applied to potential energy it converts to kinetic energy. This means that when an object such as a ball is still it has the potential to move.

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The extension of the spring is 4.83 m, if work done is 35 Newton and spring constant is 3 k N/m.

The spring constant, k, is a measure of the stiffness of the spring. it's far one of a kind for unique springs and materials. the larger the spring regular, the stiffer the spring and the greater.

Spring constant of 3 k N/m,

The amount of work done in extending is 35 N

WORK DONE by spring force = 1/2 k X²

                                                 ⇒0.5 * 3 * X²

                                   35 N = 0.5 * 3 * X²

                                 X² = 35/1.5

                                  x = [tex]\sqrt{23.33}[/tex]

                                     X = 4.83 m

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The extension of the spring is can be found out by using the Work Done due to extension in Spring Constant K. The extension in the spring is 4.83m.

The spring constant, k, is a measure of the stiffness of the spring. It is for springs and materials which measures the ratio of force that affects the spring and the displacement caused by the force action.

Spring constant depends on the stiffness of the spring, wire thickness, number of turns in wound coil, length of spring and diameter of the coil.

Given:

Spring constant = 3000 N/m

Work Done in extension= 35 N

Let the extension in spring by x.

∴ Work Done by spring force = 1/2 kx²

                        Work done   = 0.5 × 3 × x²

    ⇒                                 35 N = 0.5 × 3 × x²

    ⇒                                      x² = 35/1.5

     ⇒                                         x = 4.83m

Hence, the extension of spring is 4.83m.

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The features the scientist is likely to see are:

Based on the fact that a coral reef is an underwater ecosystem that contains different animals and species, they contain a colony of coral polyps.

This refers to the underwater ecosystem that contains different animals and species.

Hence, we can see that based on the fact that a scientist is studying the outer reef section of a coral reef, he would see the distinct characteristics of the coral and these are the:

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The wavelength, which represents the size of the smallest detectable detail that uses ultraviolet light  , is calculated as follows: 3×[tex]10^{8}[/tex] / 1.72×[tex]10^{15}[/tex] or approximately 1.74×[tex]10^{-7}[/tex]m.

The distance between the two positive, two negative, or two minimal points on the waveform is known as the wavelength of the wave. The following formula expresses the relationship between the frequency and wavelength of light:

f = c / λ

where, f = frequency of light

            c = speed of light

            λ = wavelength of light

Given data = f = 1.72×[tex]10^{15}[/tex]Hz

Therefore, λ = 3×[tex]10^{8}[/tex] / 1.72×[tex]10^{15}[/tex]

                  λ = 1.74×[tex]10^{-7}[/tex]m

The wavelength, which represents the size of the smallest detectable detail that uses ultraviolet light  , is calculated as follows: 3×[tex]10^{8}[/tex] / 1.72×[tex]10^{15}[/tex] or approximately 1.74×[tex]10^{-7}[/tex]m.

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The experiment's time period is unaffected by the change in amplitude in either experiment.

Time period is provided by:

[tex]T= 2\pi \sqrt{\frac{m}{k} }[/tex]

where,

T = time period

m = mass

k = spring constant

According to the formula, the only factors affecting the time period in a simple harmonic motion (SHM) are the object's mass and the spring constant . The time period will adjust in line with any adjustments made to the object's mass or spring constant.

Pendulum oscillations are an illustration of simple harmonic motion. Take into consideration a spring that has a fixed end. It is in its equilibrium position if no force is applied to it. Now, if we pull it outwards, the string exerts a force that is pointed in the direction of the equilibrium position.

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_______________

h=7,5 m

g=10 m/s²

ρ=1000 kg/m³

_______________

p - ?

_______________

p=ρgh=1000 kg/m³ · 10 m/s² · 7,5 m = 75000 Pa = 75 kPa

Answer:

pizza is a heterogeneous mixture.

Explanation:

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Vegetable soup is a heterogeneous mixture. Any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup

Position is measured in meters (m), so it is a base quantity.

A base or fundamental  quantity is a physical quantity, in which other quantities are derived from.

Example of fundamental quantities;

Derived quantities are those quantities obtained or expressed from fundamental quantities.

Example of derived quantities;

Thus, we can conclude that position measured in meters (m) is a base quantity.

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The constant acceleration is required to increase the speed of a car from 27 mi/h to 53 mi/h in 3 s will be 0.01 ft /[tex]s^{2}[/tex]

Velocity defines the direction of the movement of the body or the object. Speed is primarily a scalar quantity. Velocity is essentially a vector quantity. It is the rate of change of distance. It is the rate of change of displacement.

Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.

initial velocity = 27 m/h = 0.0075 m/s

final velocity = 53 m/h = 0.0147 m/s

acceleration = ( final velocity  -  initial velocity ) / time

                     =  (0.0147  - 0.0075)  / 3

                     = 0.0024 m/[tex]s^{2}[/tex]

                     = 0.01 ft /[tex]s^{2}[/tex]

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The electric energy is 32 uj

The electric potential of a point charge is [tex]V=kQ/r[/tex], or [tex]V = k Q / r[/tex]. Electric potential is a scalar while the electric field is a vector. While the total electric field can be computed by adding individual fields as vectors, the voltage resulting from a collection of point charges can be calculated by adding voltages as integers.

It is decided to set the potential at infinity to zero. [tex]E=Fq=kQr^2[/tex], but V for a point charge reduces with distance while decreasing with distance squared. Remember that the electric field E is a vector, but the electric potential V is a scalar with no direction.

The electric energy is (8×4)=32 uj

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The electric potential at that point in space is 8 v is 32uj

what is electric potential energy?

Potential energy is the energy within an object relative to its position and proximity to other objects within a field.

The electric potential of a point charge is V=kQ/rV=kQ/r , or V = k Q / rV=kQ/r . Electric potential is a scalar while the electric field is a vector. While the total electric field can be computed by adding individual fields as vectors, the voltage resulting from a collection of point charges can be calculated by adding voltages as integers.

It is decided to set the potential at infinity to zero.

but V for a point charge reduces with distance while decreasing with distance squared. Remember that the electric field E is a vector, but the electric potential V is a scalar with no direction.

The electric energy is (8×4)=32 uj

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The fishing pole is 0.0015km

Answer:

spring force = -K × x , where X is elongation or compression in the spring. ( -) sigh shows that the spring force is opposite to the applied force to cause extension.

Potential energy = work done by spring force = integration of Force.

integrate the force (-K × x) over distance 0 to x .

U = 1/2 K × X^2 ( for elongation)

U = -1/2 × K × X^2 ( for compression)