To which two faces of the block should the potential difference be applied to give the maximum current?

Given :

Initial velocity, u = -15 m/s.

Acceleration , a = 2 m/s².

Time taken to applied brake, t = 2.5 s.

To Find :

The velocity of the car at the end of the braking period.

How far has the car moved during the braking period.

Solution :

By equation :

\(v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s\)

Now, distance covered by car is :

\(s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m\)

Hence, this is the required solution.

The wavelength of a wave that has a frequency of 2.70X102 Hz and is moving through copper at 3560 m/s is 13.19m.

The wavelength of a wave can be calculated using the following formula:

λ = v/f

Where;

According to this question, a wave has a frequency of 2.70X10² Hz and is moving through copper at 3560 m/s. The wavelength is calculated as follows:

λ = 3560/270

λ = 13.19m

Therefore, the wavelength of a wave that has a frequency of 2.70X102 Hz and is moving through copper at 3560 m/s is 13.19m.

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Answer:

1298.5watt

Explanation:

Power is defined as the rate at which work is done

Expressed mathematically as;

P = F × d/ t; F = force or weight of object ;d is height or distance sustain and t is time covered

Hence for 1 person the power consumption is ;

Note weight =mass× acceleration of free fall due to gravity,g

g is known as 9.8m/S2

Time taken is 1min which is 60 sec

60 ×9.8 × 5.3/60 = 51.94 watt

Hence for 25 persons we have

25 × 51.94 =1298.5watt

1.3kilo watt( kilo is 1000)

The work done by the escalator is 3,080.4 joules and the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

The Work Done is calculated as:

Force (F) = 60 × 9.8

Distance (d) = 5.30 meters

Work (W) = F × d

Work (W) = (60 × 9.8) × 5.30

Work (W) = 3,080.4 joules

The Power is calculated as:

Time (t) = 1 minute

Power (P) = Work / Tim (t)

Power (P) = 3,080.4 / 60

Power (P) = 51.34 watts

Therefore, the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

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Answer:

When two waves meet in such a way that their crests line up together, then it's called constructive interference. The resulting wave has a higher amplitude. In destructive interference, the crest of one wave meets the trough of another, and the result is a lower total amplitude.

Answer:

These are some of the ones I found or know of.

Explanation:

F=ma

A= v-u/t

A= v^2/r

The dark region denotes the car's displacement over a 4-second time period. It can be determined as follows: (1/2)46 = 12 metres.

The intermolecular forces present in water include hydrogen bonding and dipole-dipole interactions.

Water is a polar molecule, meaning it has a positive and a negative end due to an uneven distribution of electron density. This polarity gives rise to intermolecular forces that hold water molecules together.

One of the intermolecular forces present in water is hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom, which is covalently bonded to an electronegative atom (in this case, oxygen), is attracted to another electronegative atom (such as oxygen or nitrogen) in a different molecule. In water, the oxygen atom of one water molecule forms a hydrogen bond with a hydrogen atom of a neighboring water molecule. Hydrogen bonding is a strong intermolecular force and contributes to many of the unique properties of water, such as its high boiling point and surface tension.

In addition to hydrogen bonding, water also exhibits dipole-dipole interactions. Dipole-dipole interactions occur between the positive end of one polar molecule and the negative end of another polar molecule. In water, the positive hydrogen end of one water molecule is attracted to the negative oxygen end of a neighboring water molecule. These dipole-dipole interactions are weaker than hydrogen bonds but still contribute to the overall intermolecular forces present in water.

Other intermolecular forces, such as ion-dipole interactions and London dispersion forces, are not as significant in water compared to hydrogen bonding and dipole-dipole interactions. Ion-dipole interactions occur between an ion and the charged end of a polar molecule, while London dispersion forces arise from temporary fluctuations in electron distribution. While these forces may exist in other substances, they play a relatively minor role in the intermolecular forces of water.

In conclusion, the intermolecular forces present in water are primarily hydrogen bonding and dipole-dipole interactions. These forces contribute to the unique properties and behavior of water as a liquid.

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The initial speed of the vehicle before the collision is 8 m/s.

\(m_1 u_1 + m_2 u_2 = v(m_1 + m_2)\\\\mu + m(0) = 4(m+ m)\\\\mu = 4(2m)\\\\mu = 8m\\\\u = 8 \ m/s\)

Thus, the initial speed of the vehicle before the collision is 8 m/s.

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A star in which light cannot escape because of the immense gravitational pull at its surface is called a black hole.

A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape its grasp. A dark opening is a district of spacetime where gravity is solid to such an extent that nothing, including light or other electromagnetic waves, has sufficient energy to get away from it.

A black hole can be created by the collision of universal energy ripples or by the collapse of stars, as predicted by the theory of general relativity, which states that a sufficiently compact mass can deform spacetime. Its micro-roles include: reuse cosmological flotsam and jetsam, balance out the development of systems, characterize the state of worlds, and define space around them.

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The electric field at point P is \({2.12\times10^2\ \mathrm{\frac{N}{C}}\ \hat z}\)

Given values: Radius, r = 1.80 cm Charge density, σ = +4.80 p C/m² z-coordinate, z = 2.64 cm

The electric field at point P at z = 2.64 cm is to be determined.

Let the origin of the coordinate system be the center of the circular hole.

Take the z-axis perpendicular to the surface of the nonconducting material.

The surface charge density is uniform, that is, it has the same magnitude and direction at each point.

Use the expression for electric field due to a charged disk to determine the electric field at point P.

Electric field due to a charged disk at a point on the axis of the disk:  \(E=\frac{1}{4\pi\ϵ_0}\frac{\sigma}{2}(1-\frac{R^2}{R^2+z^2})\) Here, \(\ϵ_0\) is the permittivity of free space.

R is the radius of the disk.

z is the distance from the center of the disk.

The expression for the electric field reduces to \(E=\frac{1}{4\pi\ϵ_0}\frac{\sigma}{2}(1-\frac{r^2}{r^2+z^2})\hat z\)

The electric field at point P is \(\begin{aligned} E&=\frac{1}{4\pi \ϵ _0}\frac{ \sigma }{2}(1-\frac{r^2}{r^2+z^2})\hat z\\ &=\frac{1}{4\pi \times 8.85\times10^{-12}}\frac{4.80\times10^{-12}}{2}(1-\frac{(1.80\times10^{-2})^2}{(1.80\times10^{-2})^2+(2.64\times10^{-2})^2})\hat z\\ &=\boxed{2.12\times10^2\ \mathrm{\frac{N}{C}}\ \hat z} \end{aligned}\)

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Answer: the same number of decimal places as the least precise value.

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

For example: 12.1 + 3.245 = 15.3  as the least precise number 12.1 has one decimal place.

Thus William should write the sum of these two numbers by using the same number of decimal places as the least precise value.

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The value shown by the letter E is 24V.

Define resistance

A material's ability to obstruct the flow of electrical current is referred to as resistance. The capital letter R serves as a symbol for it. A conductor's ability to obstruct the flow of charges through it is referred to as resistance.

A closed loop is referred to as a circuit where electrons can move. The circuit receives power from an electricity source, like a battery. There won't be any electron movement until the circuit is finished, or until it has made a full circuit loop back to the electrical source.

V = IR

For circuit 5, V = E

I = 8A

R = 3

E = 8*3 = 24V

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Answer:

8

Explanation:

Answer:

70 amperes

Explanation:

Ohm's Law: V = IR

I = V/R = 210/3 = 70 A

Current produced by a potential difference of 210 volts through a resistance of 3 ohms is 40 A.

Ohm's law states that the potential difference across a conductor is directly proportional to the current flowing through it.

i.e. V \(\alpha\) I

V = RI where R is a constant of proportionality called as resistance of a conductor. it opposes flow of current.

ohm's law gives the voltage drop across a resistor.

large resistor gives large voltage drop across it.

Given,

V = 120 Volt

R = 3 ohms

I = ?

V = IR

120 = 3 I

I = 40 A

Hence current produced is 40 A.

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In terms of producing the most energy per unit of carbon dioxide released, natural gas is the best fossil fuel. Because a new crop can be planted after each harvest, biomass is a renewable resource and a low-carbon fuel.

Effects of human activities on the biophysical environment, or environmental challenges, most frequently include. Numerous human activities such as overpopulation, pollution, the burning of fossil fuels, and deforestation have an adverse effect on the physical environment. Climate change, soil erosion, poor air quality, and undrinkable water have all been brought on by changes like these.

There are three main ones that generally have an impact on most of them: the loss of biodiversity, water pollution, ocean acidification, and climate change

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When the distance between two objects is doubled, the gravitational force between them is reduced by one-fourth.

Newton's law of gravitation states that an object attracts every other object in the universe with a force that is directly proportional to the product of their masses and inversely proportionate to their square distances from one other. This force may be thought of as gravitational attraction.

So, when we double the distance between the two objects then force will get reduced to one-fourth as according to newton's law of gravitation, force is inversely proportional to the square of the distance between them.

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The period measured by student b using analog wristwatch is more accurate because of less percentage of error.

Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's error is decreased by the little reading.

Given that:

period of oscillation, t = 1. 55 s.

an average period for the 5 oscillations obtained by student a: t = 1. 25 s.

average period for the 5 oscillations  obtained by student b: t = 1. 6 s

Hence, error percentage of student a = (1.55-1.25)/1.55 × 100% = 19.35%

error percentage of student b = (1.60-1.55)/1.60  × 100%  = 3.22%

Hence,  period measured by student b is more accurate because of less percentage of error.

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240 seconds

Explanation:

If he walked to A and took 80 Seconds it should be the same amount of distance to B and C

Answer:

C.

Explanation:

the earth has a high greavitational pull

Answer: C the person and earth

Explanation: I just answered it on a p e x

To determine the force required to keep a 10 mg water droplet moving in the circular arc created by a shaking dog's fur, we can use the centripetal force formula:

F = m * (v^2 / r)

Where F is the centripetal force, m is the mass of the droplet, v is the velocity of the fur, and r is the radius of the circular arc.

Converting the mass of the droplet to kilograms:

m = 10 mg = 10 * 10^(-6) kg

Substituting the given values:

F = (10 * 10^(-6)) * ((2.5)^2 / 0.16)

Calculating this expression gives us the centripetal force required to keep the droplet moving in the circular arc.

To find the ratio of this force to the weight of the droplet, we divide the centripetal force by the weight of the droplet. The weight of the droplet can be calculated using the formula:

Weight = mass * gravitational acceleration

Let's assume the gravitational acceleration to be approximately 9.8 m/s^2.

Weight = (10 * 10^(-6)) * 9.8

Finally, we can calculate the ratio of the centripetal force to the weight of the droplet by dividing the centripetal force by the weight.

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When substances change state, the molecules remain the same and there is no change in mass. This is because the molecules themselves do not break apart or form new chemical bonds.

Molecules are particles made up of two or more atoms that are bound together. They are the smallest units of matter that can still retain the properties of the substance they are part of. For example, water is made up of two hydrogen atoms and one oxygen atom, which form a molecule. Molecules vary in size and complexity; some molecules, such as proteins, are made up of hundreds of atoms. Molecules are held together by chemical bonds, which are forces of attraction between the atoms. These bonds can be of several different types, such as covalent, ionic, and hydrogen bonds. Molecules can interact with each other and with other substances, such as solids, liquids, and gases, to create new substances with different properties. Understanding the behavior of molecules is essential to the study of chemistry, biology, and other sciences.

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Given

A massive light hangs over the table in Jeremy's dining room. The light is supported by four strong chains which make an angle of 72° with the horizontal.

The force in each chain is F=36.4 N.

To find

The mass of the light in kg

Explanation

Let the mass of the light be m

The weight of the light acts downwards.

To balance thisi force the force on the string vertically upward is considered

In equillibrium

Conclusion

The mass of the light is 13.84 kg

Answer:

1000kg

Explanation:

I'm smart I am a genius I know everything so I know it is 1000kg

the structural properties that account for the two signals at 175 ppm in the 13C NMR spectrum. The 13C NMR spectrum provides information .about the chemical environment of carbon atoms.

in a molecule, but additional information and analysis are required to determine the exact structural features that account for a particular signal, such as knowledge of the molecule's chemical structure, other NMR spectra (such as 1H NMR), and an understanding of the coupling between carbon and proton nuclei. To develop an educated assessment of the signals in the 13C NMR spectrum, it is critical to analyze all of the available information from the three spectra. This might entail comparing the signals in the 13C NMR spectra. to those in the 1H NMR and/or other spectra, as well as an evaluation of the chemical shifts and coupling patterns of the signals under examination. Furthermore, the molecule structure, solvent, and sample conditions can all have an impact on the appearance of the NMR spectra, thus these parameters should be considered as well.

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Answer:

To indicate short quotations (four typed lines or fewer of prose or three lines of verse) in your text, enclose the quotation within double quotation marks.

Answer:

The reason you feel weightless is because there is no force pushing against you, since you are not in contact with anything. Gravity is pulling equally on all the particles in your body. This creates a sensation where no forces are acting on you and you feel weightless.

The magnitude of the resultant force is 11.4 N.

The resultant force is the force that has the same effect both in magnitude and in direction as the two or more forces acting at the same time. We know that force is a vector quantity, this implies that both the magnitude and the direction of the force are all important. This is why we have to factor in the direction of the force at all times.

Now, we can see that, it is possible to obtain the resultant force from the parallelogram law of vectors. We can see that;

R = √ P^2 + Q^2 - 2PQ Cos θ

P = 5 N

Q = 8 N

θ =  120°

R = √(5^2 + 8^2 - (2 * 5 * 8) cos 120

R = 11.4 N

The direction of the 5N force is obtained as;

Tan^-1 (8/5)

= 58 degrees

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The distance between point charge is 9.49m.

The magnitude of the force of attraction is given by Coulomb's law where we have 1 absolute value of force and the charges.

Calculation:           

 F = q₁ ₓ q₂÷ 4πε0r²

             r = √q₁ .q₂÷ 4πε0F

             = √ 26·3 × 10⁻⁶ C * 47.1 × 10⁻⁶ ÷ 4πε0*5.66N

             = 9.49m

According to Coulomb's law, the force of attraction or repulsion between two charged things is directly proportional to the product of their charges and inversely proportional to the square of their distance from one another. It functions on the section that connects the two charges that are thought of as point charges.

Charles-Augustin de Coulomb, a French physicist, first described this force as the Coulomb force in 1785. Because of this, the law was called in his honor and served as the foundation for electrostatics.

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The floor exerts a normal force of 483 lb on the block.

a) The floor exerts a normal force on the block, which is equal in magnitude and opposite in direction to the force of gravity acting on the block. The force of gravity can be calculated using the mass of the block and the acceleration due to gravity:

force of gravity = mass x acceleration due to gravity

force of gravity = (15.0 lb) x (32.2 ft/s^2) (Note: acceleration due to gravity is expressed in feet per second squared, since the problem uses pounds as a unit of mass and is likely in English units.)

force of gravity = 483 lb

Therefore, the floor exerts a normal force of 483 lb on the block.

(b) When the rope is tied to the block and is run vertically over a pulley, the block is now subject to two forces: the force of gravity and the tension force in the rope. The tension force in the rope is equal in magnitude and opposite in direction to the force needed to support the hanging object, which is also 10.0 lb.

Since the block is not accelerating in the vertical direction, the net force on the block must be zero. This means that the tension force in the rope must be equal in magnitude to the force of gravity acting on the block, plus the force of gravity acting on the hanging object:

tension force = force of gravity on block + force of gravity on hanging object

tension force = (15.0 lb) x (32.2 ft/s^2) + (10.0 lb) x (32.2 ft/s^2)

tension force = 966 lb

Therefore, the force exerted on the block by the rope is 966 lb.

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Answer:

I. Weight = 490 Newton

II. Newton's Second Law of Motion

III. Force = 100 Newton

Explanation:

Given the following data;

Mass = 50 kg

Acceleration = 2 m/s²

I. To find the weight of the gymnast;

Weight = mass * acceleration due to gravity

We know that acceleration due to gravity is equal to 9.8 m/s².

Weight = 50 * 9.8

Weight = 490 Newton

II. Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.

Mathematically, it is given by the formula;

Force = mass * acceleration

\( F = ma\)

III. To find the force, we would use the following formula;

\( F = ma \)

\( F = 50 * 2\)

Force = 100 Newton

The correct answer is (e) Hygrometer. A hygrometer is an instrument for measuring the relative humidity of the atmosphere. The hygrometer was invented by Leonardo da Vinci.

Hygometer:

A hygrometer is an instrument that measures the humidity of air or another gas: that is, the amount of water vapor it contains. Instruments for measuring humidity usually rely on measuring some other quantity, such as temperature, pressure, mass, mechanical or electrical changes of a substance as it absorbs moisture . Through calibration and calculation, these measurements can lead to humidity measurements. Modern electronics use condensing temperature (called dew point) or detect changes in capacitance or resistance to measure humidity differences. In 1480, Leonardo da Vinci invented a crude hygrometer.

The 1600s saw a huge leap forward; Francesco Folli invented a more practical device, while Robert Hooke improved many meteorological devices, including the hygrometer. In 1755 the Swiss polymath Johann Heinrich Lambert created a more modern version. Then, in 1783, Swiss physicist and geologist Horace Bénédict de Saussure invented the first hygrometer to measure humidity using human hair.

The maximum amount of water vapor (saturation) that can be held in a given volume of air varies greatly with temperature; cold air can hold less water per unit volume than warm air. Temperature can change humidity.

Complete Question:

What instrument is used to measure relative humidity?

a. an anemometer

b. a barometer

c. a wind vane

d. a psychrometer

e. a Hygrometer.

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