You start walking from a point on a circular field of radius 0.5 km and 1 hour later
you are at the same point. What is your average speed for the whole journey?

_______________

[tex]I_2=2I_1[/tex]

[tex]L=\text{const}[/tex]

_______________

[tex]\displaystyle \frac{W_2}{W_1}\; - \;?[/tex]

_______________

[tex]\displaystyle \boldsymbol{\frac{W_2}{W_1}}=\frac{\dfrac{LI_2^2}{2} }{\dfrac{LI_1^2}{2} } =\frac{I_2^2}{I_1^2} =\bigg(\frac{I_2}{I_1} \bigg)^2=\bigg(\frac{2I_1}{I_1} \bigg)^2=2^2=\boldsymbol{4}[/tex]

The magnetic flux through a certain coil is given by phim = (1/50pi) cos( 100pi t) where the units are si. the coil has 100 turns. The magnitude of the induced EMF (in volts) when t = 1/200 s is 1 / 50 π

Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface. It provides the measurement of the total magnetic field that passes through a given surface area.

An EMF is induced in the coil when a bar magnet is pushed in and out of it. EMF of opposite signs are produced by motion in opposite directions, and the EMF are also reversed by reversing poles.

EMF =   d Ф / d t

Given phi = Ф =  (1/50pi) cos100pi t  

hence ,

EMF = d ((1/50pi) cos 100pi t ) / d t

       = 1/50π * cos 100 pi

       substituting value of pi

       = 1 / 50 π * cos (100 * 180)

       = 1/ 50 π * cos ( 1800 )

EMF = 1 / 50 π

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Answer:

The voltage remains constant.

Answer:

The voltage in the circuit remains same. However the current drawn by the circuit will increase.

Explanation:

According to Ohm's Law:

V=IR

If we halved the resistance let:

R'=R/2

then

I'=2I in order to kept the Voltage same. Also the resistance is the opposition to the current. So, if resistance will halved then obviously current will double

So when we put these value in to Ohm's Law the results is:

V'=I'R'

V'=2I(R/2)

V'=IR which is equal to first voltage. Hence,

V'=V

Answer:

he can fall down

Explanation:

he could fall down because of the tomatoes and do notice he has fallen down because of them

Answer:

charge passed = 1800 C

Explanation:

• We can use the following formula to calculate charge:

[tex]\boxed{Q = It}[/tex],

where:

Q = charge in Coulombs

I = current in amperes (0.5 A)

t = time in seconds (1 h = 60 min = 3600 s).

• Substituting the values into the formula:

charge = 0.5 × 3600

            = 1800 C

Answer:

B

because waves generated

At rms voltage ([tex]V_{rms}[/tex]) = 39.59V resistor will dissipate 14.0W.

The term "alternating current" (AC) describes a current in which the voltage and current both take the shape of sinusoidal waves. Root mean square value is indicated by the letter "rms." Both the mean voltage and mean current of an alternating circuit are represented by it.

Also, power dissipated is

P = [tex]V^{2} _{rms}[/tex] / R

2 = [tex]15^{2}[/tex] / R

2 = [tex]\frac{225}{R}[/tex]

R = 112Ω

If P = 14 W,

[tex]V^{2} _{rms}[/tex] = PR

[tex]V^{2} _{rms}[/tex] = 14×112

[tex]V^{2} _{rms}[/tex] = √1568 = 39.59V

Therefore, at rms voltage ([tex]V_{rms}[/tex]) = 39.59V resistor will dissipate 14.0W.

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The energy of the violet light emitted by a hydrogen atom with a wavelength of 410. 1 nm will be 4.85 * [tex]10^{-19}[/tex] J

Light energy is a form of electromagnetic radiation that comprises wavelengths that the common human eye can detect. Light is a type of kinetic energy. It consists of particles like photons, which have wave-like properties. It can affect the physiology of an organism, like photosynthesis or the sense of sight.

Energy = h*c / lambda

where

h = plank's constant  =  6.626 * [tex]10^{-34}[/tex] J-s

c = speed of light  = 3 * [tex]10^{8}[/tex] m/s

lambda = wavelength = 410. 1 nm = 410. 1  * [tex]10^{-9}[/tex] m

Energy = 6.626 * [tex]10^{-34}[/tex] *  3 * [tex]10^{8}[/tex]  / 410. 1  * [tex]10^{-9}[/tex]

            = 4.85 * [tex]10^{-19}[/tex] J

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Considering light at the two ends of the visible light spectrum, violet light has a shortest wavelength and a highest photon energy than red light

In visible light spectrum wavelength of violet light is 380 nm to 450 nm whereas wavelength of red light is 620 nm to 750 nm.

The increasing order of visible light spectrum i.e. VIBGYOR is Violet > Indigo > Blue > Green > Yellow > Orange > Red .

When we discuss about the photon energy of Violet Light, it is 2.85 ev to 3.26 ev and the photon energy of Red Light is 1.65 ev to 2.00 ev

V- Violet- shortest wavelength with highest energy

R- Red- highest wavelength with minimum energy

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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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Answer:

The pressure exerted by a women wearing shoes with pointed heels is much greater than what an elephant with one foot can exert on ground. This because of lesser area of contact of pointed heels.

hope helpful ~

False; finding it would require much more than a few days of observation.

The Doppler approach is a reliable way to find exoplanets. It examines the velocity and characteristics of the star and planet using the Doppler effect. The star and the planet both revolve around the same mass.

The periodic velocity change of the stellar spectrum brought on by an orbiting massive planet is discovered using Doppler spectroscopy.

Doppler spectroscopy tracks changes in the host star's light's hue to find periodic shifts in radial velocity. A star's spectrum is redshifted when it moves away from us and blueshifted when it moves toward us.

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The factor that can have a significant influence on a planet’s surface temperature is its atmosphere.

The atmosphere plays a fundamental role in the Earth planet's temperature because it allows the entry and out of certain types of radiation that may increase the temperature.

The role of the atmosphere in the Earth's temperature is well documented because our temperature is thick and it increases its homeostatic temperature balance.

In conclusion, the factor that alters a planet’s surface temperature is its atmosphere.

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The energy density at the center of a circular loop of wire carrying a 23.0 a current if the radius of the loop is 28.0 cm will be 1.06 * [tex]10^{-3}[/tex] J / [tex]m^{3}[/tex]

Energy density is defined as the amount of energy accumulated in a system per unit volume. In the case of electrical energy. Electrical energy density = permittivity* Electric field squared/2 mu0

When an electric current is passed through a current-carrying circular wire loop, the magnetic field lines are generated in a circular pattern around the arms of the coil while the magnetic field lines are straight at the center of the loop

The magnetic field strength at the center of a circular loop is given by

B=(muo*I)/2R  (at center of loop),

Energy density = [tex]B^{2}[/tex] / 2 (mu0)

                          = [tex]\frac{1}{2 (muo)}[/tex] * [tex](\frac{muo * I}{2R})^{2}[/tex] = [tex]\frac{muo * I^{2} }{8 * R^{2} }[/tex]

                          = [tex]\frac{4*3.14*10^{-7}*(23)^{2} }{8 * (0.28)^{2} }[/tex]

                          = 1.06 * [tex]10^{-3}[/tex] J / [tex]m^{3}[/tex]

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The you see a fish off to your right is actually farther to the left in the direction you’re looking due to refraction of light.

Refraction of light is the bending of light rays as the cross the boundary between two media of different densities.

When light travels from a less dense to a denser medium, the ray of light is bent closer towards the normal. However, when the ray of light is travelling from a denser to a less dense medium, the ray of light is bent away from the normal.

Considering the situation in seeing a fish through an aquarium. Light rays from the water which is less dense than air travels to the eyes and is bent away from the normal. Therefore, the fish seen straight ahead is actually, farther to the left.

In conclusion, refraction of light causes the apparent change in the position of the fish.

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The right hand palm rule is that a proton moving down in the magnetic field points away from you and will experience a towards the left . Option A

The Flemings left and right hand rule from the foundation of electromagnetism. Recall that electromagnetism has to do with the production of current by the relative motion between a charge and a magnetic field.

According to the Flemings right hand rule, when the thumb, the fore finger and the middle finger are mutually perpendicular to each other, then the then the thumb points towards the direction of the magnetic force, the forefinger points towards the magnetic field and the middle finger points in the direction of  the current.

As such, the description that matches the image below of a hand that is using the right hand palm rule is that a proton moving down in the magnetic field points away from you and will experience a towards the left . Option A

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The If a car is going round a curve , there is an acceleration because the direction of the velocity changes.

Now we know that if you throw the ball upwards, the motion is in opposite direction to gravity thus the ball is experiencing deceleration and the speed decreases. The velocity decreases and the acceleration is negative.

If the ball is coming down, then the ball is accelerated thus it speeds up and the direction of the acceleration is positive.

If a car is going round a curve, the vehicle is accelerating because the direction of the velocity changes even if its amount remains constant.

When a board is moving down a hill at 2 ms-1, it is experiencing an acceleration because the motion is in the same direction as gravity.

If a car is coming to a stop at a point, it experiences a deceleration and not an acceleration since the change of velocity with time is negative as the car comes to rest.

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Answer:

Around [tex]1.4[/tex] solar mass.

Explanation:

In a white dwarf, electron degeneracy prevents the star from collapsing into itself. However, if the mass of the star exceeds the Chandrasekhar Limit, gravity would overcome electron degeneracy and star would collapse further.

The value of the Chandrasekhar Limit is approximately [tex]1.4\; M_{\odot}[/tex] ([tex]1.4[/tex] times the mass of the sun.) While this mass is the maximum possible mass of a stable white dwarf, the original mass of the star that formed this white dwarf tends to be much greater.

The potential energy of a 2-μc charge at that point in space is [tex]8*10^{-4}[/tex] joules.

Given,

V=400v, q=2-μc=2*[tex]10^{-6}[/tex],

U(potential energy)=V*q=400*2*[tex]10^{-6}[/tex]= [tex]8*10^{-4}[/tex] joules.

The energy that an item retains due to its position in relation to other objects, internal tensions, electric charge, or other reasons is known as potential energy in physics. The gravitational potential energy of an object is based on its mass and the distance from the centre of mass of another object. Other common types of potential energy include the elastic potential energy of an extended spring and the electric potential energy of an electric charge in an electric field. The joule, denoted by the sign J, is the SI's definition of an energy unit.

The vectors that are described as gradients of a particular scalar function known as potential can be used to represent these forces, also known as conservative forces, at any location in space.

At a certain point in space there is a potential of 400 v. what is the potential energy of a 2-μc charge at that point in space? group of answer choices'

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The inductance of the inductor is 35.8 mH.

What is inductance?

Inductance, which would be defined as the proportion of voltage to current change rate, is what distinguishes an inductor from other electrical devices. The magnetic field induced on the coil causes inductance. The coil's form is one of the many elements that affect it.

Calculation:

Provided that,

voltage = 120 V

frequency = 1000Hz

capacitor (C) = 2.00μF

current = 0.680 A

We have to find out the inductance of that inductor by using the formula of the current,

I = V/Z

Z = [tex]\sqrt{R^{2} +(Lw - \frac{1}{Cw)^{2} } }[/tex]

Now putting the value of Z into this equation we get:

I = [tex]\frac{V}{\sqrt{R^{2}+(Lw - \frac{1}{Cw})^{2} } }[/tex]

0.680 = [tex]\frac{120}{\sqrt{100^{2}+(L* 2\pi *1000 - \frac{1}{2*10^{-6}*2\pi *1000 })^{2} } }[/tex]

L = 35.8 mH

Therefore it is concluded that the inductance of the inductor is 35.8 mH.

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If the magnitude of the sum of two vectors is greater than the magnitude of either vector, then scaler product will always be positive

A vector is a quantity or phenomenon that has two independent properties: magnitude and direction. The term also denotes the mathematical or geometrical representation of such a quantity.

The scalar product of two vectors is the sum of the product of the corresponding components of the vectors. In other words, the scalar product is equal to the product of the magnitudes of the two vectors and the cosine of the angle between them. It is a scalar quantity and is also called the dot product of vectors.

if | a + b | > |a| or |b|

a. b = |a| |b| cos (theta)

since , | a + b | > |a| or |b|

hence, angle between a and b must be less than 90°

since , |a| and |b| are positive

cos (theta ) will also be positive as angle is between 0° and 90°

hence , cos (theta ) will be positive

hence scaler product will always be positive

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While a car is running, the alternator provides current to the battery and recharges it. Reduction  reaction occurs at the anode of a lead-storage battery during this process .

The Lead-acid battery or lead-storage battery is one of the oldest types of rechargeable batteries.

Lead-storage batteries can be classified as secondary batteries. The chemical reactions that occur in secondary cells are reversible. The chemical process of extracting current from a secondary battery (forward reaction) is called discharging. The method of regenerating active material is called charging.

While recharging, the automobile battery functions like an electrolytic cell. The energy required to drive the recharging comes from an external source, such as an engine of a car. While charging reduction takes place at anode and while discharging oxidation takes place at anode.

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The direction of the net electric force that acts on an electric charge at every point of an equipotential surface created by other charges must be perpendicular to the surface.

A surface with an equipotential potential is one where all points on the surface have the same electric potential. This means that at every point on the equipotential surface, a charge will have the same potential energy.

The repulsive or attractive interaction between any two charged bodies is called as an electric force. Similar to any force, its impact and effects on the given body are described by Newton's laws of motion. The electric force is among the list of other forces that exert over objects.

On an equipotential surface , the potential difference between any two points is zero. So , the work done by the electric field on a test charge moving on the surface will be zero. Therefore , the electric field must be perpendicular to the surface at every point . Hence electric force must have the same direction , that is perpendicular to the surface.

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The distance between identical points in adjacent cycles of a waveform signal is called wavelength. The n₁ for the initial level of the electron is 4.

The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal carried in space or down a wire is defined as the wavelength.

Given the wavelength is 489.2 nm, also, it is stated that the nf level is Balmer series. Therefore,

nf level = 2

The wavelength, λ = 489.2 nm = 4.86× 10⁻⁷ meter

Now, the mathematical formula for wavelength is given as,

[tex]\dfrac{1}{\lambda} = R[\dfrac{1}{nf^2}-\dfrac{1}{n_1^2}][/tex]

where R is the Rydberg constant and its value is equal to 1.097×10⁷.

Therefore, we can write,

[tex]\dfrac{1}{4.86 \times 10^{-7}} = 1.097 \times 10^7 [\dfrac{1}{2^2} - \dfrac{1}{n_1^2}][/tex]

n₁ = 4.0021 ≈ 4

Hence, the n₁ for the initial level of the electron is 4.

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Answer:

141 J  

Explanation:

The lowest sig digits in a calculation determine the sig dig of the answer

The temps are listed with 3 significant digits and the spec heat is 3 sig digits  (the mass has 4 sig digs) .....so answer will need 3 digits

31.91 g   * .903 J/g-C  *  (26.1 - 21.2 C) = 141 J   (three sig dig)

The capacity for doing work that a body possesses because of its position or configuration is known as Potential Energy.

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When fluids are pulled into capillaries, the receptor will detect the resulting pressure is Osmoreceptor

Osmoreceptor is any  group of cells sensitive to plasma osmolality that are held to exist in the brain and to regulate water balance in the body by controlling thirst and the release of vasopressin.

Osmoreceptors (Fig. 4-11) located in the hypothalamus (and also in the carotid artery) are capable of sensing the concentrations of solutes, particularly sodium ion. This leads to a secretion of vasopressin.

An osmoreceptor is a sensory receptor primarily found in the hypothalamus of most homeothermic organisms that detects changes in osmotic pressure. Osmoreceptors are sensory receptors that detect changes in osmotic pressure and contribute to maintaining fluid balance in the body. They are primarily found in the hypothalamus and kidneys.

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[tex]\huge\underline{\underline{\boxed{\mathbb {EXPLANATION}}}}[/tex]

The heat capacity is given by the expression:

[tex]\longrightarrow \sf{\triangle Q= m \triangle C \triangle T}[/tex]

[tex]\longrightarrow \sf{Q= \: Heat}[/tex]

[tex]\longrightarrow \sf{M= \: Mass}[/tex]

[tex]\longrightarrow \sf{C= \: Specific \: Heat}[/tex]

[tex]\longrightarrow \sf{T= \: Temperature}[/tex]

[tex]\huge\underline{\underline{\boxed{\mathbb {ANSWER:}}}}[/tex]

[tex] \leadsto[/tex] When the [tex] \bm{heat}[/tex] is measured in the calorimeter, we obtain a value, and since we know the mass of the material and we control the change in [tex] \bm{temperature}[/tex] , we can then determine the specific heat "C" by simply remplazing in the expression.

The heat capacity of a material is its ability to absorb heat energy. There are different methods to determine the heat capacity of a material, depending on the specific conditions and resources available. Here are some common approaches:

It's imperative to note that heat capacity can vary with temperature, pressure, and other factors. Therefore, measurements or data should ideally be conducted or referenced within the appropriate range of conditions relevant to the specific application or analysis.

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

Newton’s second law of motion states that the acceleration of a person or object is proportional to the force applied to it and inversely proportional to its mass.