a potential difference of 2.0 v is applied across a wire of cross-sectional area 2.5 mm2. the current which passes through the wire is 3.2 x 10-3 a. what is the resistance of the wire?

Answer:

C. 24,600

Explanation:

Work = F × s

Work = 36.8 × 668

SO

Work = 24,582J rounding up to 24,600 J

Answer:

24,600

Explanation:

Answer:

[tex]vf=vi+at\\vf=15\\vi=0\\a=?\\t=5\\\\15=0+a5\\a=\frac{15}{5} \\a=3[/tex]

Therefore the acceleration is 3m/s^2

Explanation:

We will be using the kinematics big five equations. Specifically, the one without displacement (d).

Write out your values and substitute the, into the equation.

Solve for a.

Note. Starts from stop so vi=0

You can obtain important information on this topic, such as the density of freshwater and ocean, in textbooks or online.

Pf for freshwater is 1x103 kg/m3.

Pf for seawater is 1025 kg/m3.

We may now compare the densities of the lady and the freshwater using the equation of fraction submerged, which compared the densities of both elements.

a). Pw + Pf = Fs

Put an end to the woman's density

Pw = Fs * Pf Pw = 1x103 kg/m3 * 0.96 = 960 kg/m3

Fs * Pf Fs = 1.0 - 0.04 = 0.96

Currently, the proportion of sea water is:

Fs = Pw/Ps = 960 / 1025 kg/m3 = 0.9366

Fs = 1.0 - 0.9366 = 0.0634 * 100

%v = 6.34

Density is defined as the measure of how closely a material is packed together. It is described as the mass per unit volume. D or ρ is the symbol for density. Density Formula: = m/V, where is the density, m is the object's mass, and V is its volume.

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Answer:

475 Joules

Explanation:

Kinetic energy in Joules is given by the equation

KE = (1/2) m x v²

where

m = mass of the object in kg

v = velocity in m/s

If velocity is reduced by half from v to v/2, then KE is reduced by 1/4 since

new KE = (1/2) x m x (v/2)² = 1/4 x previous KE

Since previous KE = 1.9 x 10³ J

new KE = 1/4 x 1.9 x 10³ J

= 0.475 x 10³ J = 475 Joules

A constant called Planck's constant directly connects the energy of a photon to the frequency of vibration of a charged particle.

E=hv 1.48 x 10-15 J

= (6.626 x 10-34) (v)

v= 1.48 x 10-15 J/6.626 x 10-34

v= 2.23 x 10 18 Hz

In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles .

In science and engineering, frequency is a crucial metric for describing the temporal rate of change seen in oscillatory and periodic processes.

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The total time in the air during uniform motion is 10.10 seconds.

We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

vo = 0 m/s

s = 125 m

a = g = 9.8 m/s²

By using the third equation, we can find the time taken to fall to the ground

s = vo . t + 1/2 . a . t²

125 = 0.t + 1/2 . g . t²

1/2 . 9.8 . t² = 125

t² = 250/9.8

t = 5.05 seconds

The total time should be twice

t total = 2t

t total = 2 . 5.05

t total = 10.10 seconds

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Freefall is the state of a body that moves freely in any direction in the presence of gravity. The window is 15.01 meters above the ground.

According to free fall,

vf = g * t

here Vf = 17.2 m/s

g = 9.8 m/s^2

then t = vf/ g = 17.2/9.8 =1.75 sec

According to free fall Equation,

Distance d = 1/2 g * t^2

d= 1/2 *9.8 * 1.75^2= 15.01 m

Window is located 15.01 m height from the Ground.

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work done = f.d cos x = 300* 400* cos 70 = 41040 J

Work done by the vertical component. = 281.9 x 400x cos 70 = 38563.9 J

Work done by horizontal component = 102.6 x 400x cos 70

 = 14035.68 J

The force and its displacement are 300N and 400m lalong the

direction of 70° horizontal.

work done = f.d cos x = 300* 400* cos 70 = 41040 J.

Work done by horizontal component = horizontal force x d cos x

horizontal force = 300 x cos 70 =300 x .342 = 102.6 N

Work done by horizontal component = 102.6 x 400x cos 70

 = 14035.68 J

force  by the vertical component. = 300x sin 70 =300x .939

= 281.9 N

Work done by the vertical component. = 281.9 x 400x cos 70 = 38563.9J

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The angle of refraction will be 26.4°

Organic substances include ethanol. With the chemical formula C2H6O, it is a straightforward alcohol. Its chemical formula can also be expressed as C2H5OH or CH3CH2OH. Ethanol is a volatile, flammable, colorless liquid with a pronounced wine-like aroma and unpleasant taste.

The angle of incidence is the angle formed by an incident ray and the normal, or line perpendicular to the incident surface, at its point of incidence. Any type of wave, including optical, acoustic, microwave, X-ray, and others, can create a ray.

Refraction is the path of a light wave being bent as it crosses the divide between two media. Refraction results from a wave's change in speed when it encounters a change in medium.

The angle of refraction, which depends on the material's refraction index, is the degree by which this light bends away from or toward the normal line. Each type of material has its own constant known as the refraction index. The amount that an incident light beam is refracted as it passes through directly affects it. It is frequently represented as n and may be calculated by dividing the velocity of light moving through the medium (v) by the speed of light in a vacuum (c):

n = c / v

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There are many forces that influence waves; they are classified as either generating or restoring forces. The generating forces are option A, C, D and E:

Wind is the most frequent cause of waves. The friction between the wind and the surface of the water produces wind-driven waves.

Note that A wave crest is produced when wind often disturbs the water's surface in an ocean or lake. The movement of the water, gravitational pull, and wind all contribute to the formation of waves.

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Wind

Animals

Physical displacement

Pressure differences

Earthquakes

The weight of the diver in newtons is 770 N.

The total decrease or increase in the gravitational potential energy of the diver and Earth system can be given by,

∆U = mg∆h

Where,

ΔU is the change in gravitational potential energy,

m the mass of the diver,

g is acceleration due to gravity,

∆h is the total change in height.

It is given that the change in gravitational potential energy is 28500 joules and the change in height is 37 m.

Now putting all the values,

28500 = mg(37)

m = 770 Kg.

Hence, weight of the diver is 770N.

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720 kgf is the vertical force between the elevator floor and the desk.

Mass of table in elevator = 60 kg

Acceleration of table and elevator (upward movement) = 2.2 m/s²

To determine the vertical force between the elevator floor and table.

where:-

N = normal force between elevator floor and table

m = mass of the table

g = gravity (9.8 m/s²)

a = acceleration of table and elevator (upward motion)

N = mg + ma

N = 60 kg x 9.8 m/s² + 60 kg x 2.2 m/s²

N = 588 + 132

N = 720 kgf

∴ N=720 kgf is the vertical force between the elevator floor and the desk.

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The velocity of the 2 Kg ball as it was launched, given that it has a kentic energy of 25 J is 5 m/s

From the question given above, the following data were obtained:

The velocity of the ball can be obtained as illustrated below:

KE = ½mv²

Plug in the variables

25 = ½ × 2 × v²

25 = v²

v = √25

v = 5 m/s

Thus, from the calculation made above, we can conclude that the velocity is 5 m/s

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According to  the given statement the resistance of a 37.0 m long piece of such wire is 3151Ω.

Resistance values are represented in ohms. When there is an electron difference between two endpoints, electricity can flow from high to low. In opposition to that flow is opposition. As critical stress intensity, the current decreases. On the other side, when the resistance decreases, the current rises.

Copper wire's resistance (R) at 20 degrees Celsius is 1.72x10^-8Ωm.

Coil length(L) of the wire=37.0m

Cross-sectional area of the conductor or wire (A) = π²

A= π * (1.291/1000)/2=2.02*10⁻⁶

To calculate for the resistance (R):

R=ρ*L/A

R=(1.72*10⁸)*(37.0)/(2.02*10⁻⁶)

R=3150.49Ω

Approximately, R=3151Ω

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Let each half of the tourist's running time be t.

During the first half time, the speed of the car is 4 km/h

Distance covered d1​ = 4t km

During the second half time, the speed of the car is 1 km/h

Distance covered d2 = t km

Total distance covered D = d1 +d2 = 4t + t = 5t

Total time is taken T = 2t

Average speed = D/T = 5t/ 2t = 2.5 km/hour

The diagram can be represented as:

                                              Mid-point            

______4km/hour_→_________°                    1 km/hour →__________

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With atmospheric perspective, objects further from the viewer appear cooler and less distinct.

The term "atmospheric perspective" describes how the atmosphere affects how objects appear when viewed from a distance. Further away things are less distinct, and their color changes in value, saturation, and hue. Exaggerating these effects in your painting will help you as an artist to add more atmosphere and feeling to your creations.

This enhances the appearance of depth and distance and contributes to the setting of the landscape's atmosphere and vibe. This tone and feeling are crucial components of the visual poetry of a landscape painting. Aerial perspective is another name for atmospheric perspective.

In order to convey a sense of distance and depth in a painting, an artist can employ either atmospheric perspective or linear perspective.

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The reinforcement schedule is this variable interval.

Shaping is the use of iterative approximation enhancements to the desired behavior. In particular, when molding techniques are used the approximate desired motion exhibited is enhanced, but the motion that is not an approximation of the desired motion is not enhanced.

Continuous reinforcement is reinforcement that is repeated each time the behavior occurs. This may involve a positive applying the stimulus or negative reinforcement with the aim of encouraging a specific behavior. Continuous enhancement is one of the two basic types of enhancement plans. Associative learning occurs when organisms associate stimuli or events that occur simultaneously in their environment.

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Answer:

Explanation:

The spectrum of the planet clearly shows the presence of iron, hydrogen and sulfur.

The spectrum of the planet shows the presence of iron, hydrogen and sulfur.

A spectrum is a state that may fluctuate without gaps over a continuum and is not constrained to a particular set of values (plural: spectra or spectrums)[1]. After passing through a prism, visible light takes on a rainbow of colours, which is how the term was first used scientifically in optics. As knowledge of light increased on a scientific level, it started to encompass the entire electromagnetic spectrum. As a result, it evolved into a mapping of a variety of magnitudes (wavelengths) to a variety of attributes, including the perceived "colours of the rainbow" and other features that correspond to wavelengths outside of the visible light spectrum.

Today, analogies with spectrum are used to discuss subjects unrelated to optics.

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In 15 seconds, the car has travelled a distance of  270 meters.

The three equations of motion are -

Given is a car at rest which begins accelerating at 2.4 m/s² for 15 s.

From the given data, we can write -

[u] = 0 m/s

[a] = 2.4 m/s²

[t] = 15 s

We will use the second equation of motion to find how far the car has gone.

S = ut + 1/2at²

Substituting the values, we get -

S = 0 x 15 + 0.5 x 2.4 x 15 x 15

S = 0.5 x 2.4 x 15 x 15

S = 270 meters

The car has travelled 270 meters.

Therefore, in 15 seconds, the car has travelled a distance of  270 meters.

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Work done in lifting a 110N child for 0.5m is 55 Joules.

The work done by a force is defined as the product of the force's component in the direction of displacement and the magnitude of displacement.

Work can be computed by multiplying Force by Distance in the force's direction, as shown below.

W = F × d  (where F= force & d= displacement).

The standard unit used to measure energy and work done in physics is the joule, which has the symbol J. In mechanics, 1 joule is the energy transferred when a force of 1 Newton is applied to an object and moves it through a distance of 1 meter.

Work done (W)= F×d

W= 110×0.5

Therefore,

W= 55 Joules.

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Stellar equilibrium is a balance between Outward pressure and inward gravity.

As long as a balance is maintained between the gravity that pulls the star inwards and the pressure that pushes it outwards, the stars are fine. During most of a star's life, its internal heat and radiation are provided by nuclear reactions in the star's core. Star balance refers to the balance of forces that exist within a star.

Stars are composed of helium gas and hydrogen gas constantly undergoing nuclear reactions in their core. The pressure of these reactions pushes out of the star. At the same time gravity is pushing the star. At the main-sequence stage of stellar evolution, the outward-pushing radiation pressure and the inward-pushing gravitational pressure are precisely balanced. In a stable star, the pressure of gas pushing away from the center is the same as the gravitational force pulling atoms toward the center.

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The  s-processes produce elements lighter than lead and the r-processes would produce heavier elements.

Most of the elements are produced through processes in  the stars. There are two types of processes the r-process and the s-process. In r-process,  a heavy atom captures the nearby neutron, it can  transfer to heavier isotope or element. And when this happens multiple times to an atom, heavy elements are produced. Thus,  r-processes would produce heavier elements.

The s-process is slower. It uses neutron capture and the subsequent decay of that neutron into a proton resulting in formation of the lighter elements. Thus s-processes produce elements lighter than lead.

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Answer:

t

Explanation:

In the Van de, Graaff generator is a rubber belt stretched over two pulleys. At the bottom is the drive pulley connected to the motor. In the generator above the drive, the pulley is covered with felt and the top pulley is bare plastic.

Van de Graaff Generators are devices used to generate large amounts of static electricity. Static electricity is created by an extra charge stored somewhere to keep things from moving. Fees generally don't like to accumulate in one place. They seek out opposite charges as partners and like to run away from particles with the same charge.

When switched on the dome of the Van de Graaff generator is charged positively or negatively depending on the design. Anything that touches the dome receives the same charge. When a person has a dome, it is charged and can stand on end if the hair is long and dry enough. Most Van de Graaff generators store a positive charge in the dome by separating the negative charge from the positive charge.

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Answer:

C - 5.3s

Explanation:

a = v - u / t

so,

t = v - u / a

t = 180 - 100 / 15

t = 5.3s

Answer:

Explanation:

Metals refers to the natural elements that are hard, shiny, opaque and dense.

Non-metals implies those chemical substances that are soft, non-shiny, transparent and brittle

KEEP IN MIND: Most metals are hard, except sodium. Most non-metals are soft, except diamond.

This table will help you understand it better.

Spectral shifts are caused by the movement of the spectrum to shorter wavelengths, while the Big Bang Theory is supported by spectra analyses because we can determine how spectra of electromagnetic radiation from stars changes depending on their relative position.

The Big Bang Theory is a widely accepted model in physics about the boring of the Universe, which it is believed occurred though a big explosion, while light spectra refers to the observation of the electromagnetic radiation emitted by stars.

Therefore, with this data, we can see that the Big Bang Theory obtains supportive evidence from the emission of electromagnetic spectra of stars.

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Answer:

C.  240 N

Explanation:

I think you have the third answer choice incorrect. It should be 240N because that is the correct answer

From newtons law of gravitation, the gravitational force equation between two objects is given by

[tex]F = \dfrac{Gm_1m_2}{r^2}[/tex]

where m₁ and m₂ are the masses of the two objects, G = gravitational constant and r the distance between the objects

If we double m₁ and m₂, the new gravitational force becomes

[tex]F = \dfrac{G(2m_1)(2m_2)}{r^2} = \dfrac{4Gm_1m_2}{r^2}\\\\[/tex]

which is 4 times the original force

So if original force = 60 N, then resultant force after doubling both the masses = 4 x 60 =240N