Examine table b then read the statement and choose the best responses. as the resistance increased under 25 v, the current . compared to calculated currents, experimental currents proved to be . currents varied proportionally according to resistance: 10 ω of resistance produced a current of a, while 100 ω of resistance produced a current of a.

The magnetic field strength is 9.47 ×10⁻⁴ T

The energy density at the center of the loop is 0.36 J/m³

From the question, we are to find the magnetic field strength

The magnetic field strength of a loop can be calculated by using the formula,

[tex]B = \frac{\mu_{0} I}{2R}[/tex]

Where  B is the magnetic field strength

[tex]\mu_{0}[/tex] is the permeability of free space [tex](\mu_{0}=4\pi \times 10^{-7} \ N/A^{2})[/tex]

[tex]I[/tex] is the current

and R is the radius

From the give information,

[tex]R = 75 \ mm= 75 \times 10^{-3} \ m[/tex]

and [tex]I = 113 \ A[/tex]

Putting the parameters into the formula, we get

[tex]B = \frac{4\pi \times 10^{-7} \times 113}{2 \times 75 \times 10^{-3} }[/tex]

[tex]B = 9.47 \times 10^{-4} \ T[/tex]

Hence, the magnetic field strength is 9.47 ×10⁻⁴ T

Now, for the energy density

Energy density can be calculated by using the formula,

[tex]u_{B} = \frac{B^{2} }{2\mu_{0} }[/tex]

Where [tex]u_{B}[/tex] is the energy density

Then,

[tex]u_{B}= \frac{(9.47\times 10^{-4} )^{2} }{2 \times 4\pi \times 10^{-7} }[/tex]

[tex]u_{B} = 0.36 \ J/m^{3}[/tex]

Hence, the energy density at the center of the loop is 0.36 J/m³

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Answer:

Mars

Explanation:

It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.

I hope it helps! Have a great day!

Anygays-

Answer:

No

Explanation:

If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together

Answer:

A V = A X / t         where X / t    is speed of fluid

A V = area * velocity (rate of fluid flowing)

A1 V1 = A2 V2        form of equation of continuity

pi (D1 / 2)^2 V1 = pi (D2 / 2)^2 V2

V2 = (D1 / D2)^2 * V1 = (8 / 5)^2 * 1.28 m/s = 3.28 km/s

Answer:

Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

This definition refers to a caesium atom at rest at a temperature of 0 K

Explanation:

Answer:

Option B

Explanation:

Option B

Answer is PHOTOELECTRIC EFFECT

Let's see

According to law of conservation of linear momentum

Answer:

0.35 J

Explanation:

This problem requires the Law of Conservation of Energy.

⇒ Potential energy = Kinetic Energy

⇒ mgh = 1/2mv²

⇒ 0.5 x 10 x 0.07 = KE

⇒ KE = 5 x 0.07

⇒ KE = 0.35 J

Answer: 570 J

Explanation:

The amount of heat gained by the piece of zinc can be calulctaed using   ∆Q = mc∆T

=> ∆T = 36-26 = 10°C

m = 0.15 kg, s = 380J/kg/°C

=> ∆Q = 0.15 x 380 x 10

= 570J

Answer:

Momentum must be conserved in the collision.

The steel block must move faster after the collision to preserve momentum.

If the steel block is moving faster it will aso have more kinetic energy.

(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)

Answer:

F

Explanation:

Reducing access will cause less damage to occur

Answer: the answer is false

Answer:

11. true

12.

13. an upside down tree

14. copd

[tex] \bf\sf \underline{Given: - }[/tex]

[tex] \bf\sf \underline{To \: Find: - }[/tex]

[tex] \bf\sf \underline{Solution: - }[/tex]

We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,

1g = 0.001kg,

⠀⠀⠀50g = 0.05g

Now we know the formula of Kinetic energy,

[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]

Hence, the kinetic energy of the pebble is 10J.

The image here is not found here but star formation is characterized by clouds of dust where stars are born.

Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.

Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).

Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.

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Answer:

Your answer would be:
B.) False


If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.

If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.

Explanation:

Have a great rest of your day
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The approximate speed of the sound wave traveling through the solid material is 1012m/s.

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

From the wavelength, frequency and speed relation,

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given the data in the question;

To determine the approximate speed of the wave, we substitute our given values into the expression above.

λ = v ÷ f

2.3m = v ÷ 440s⁻¹

v = 2.3m × 440s⁻¹

v = 1012ms⁻¹

v = 1012m/s

Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.

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Answer:

F = M a

M = 3 kg

a = 2.2 m/s^2

T = tension in rope

T - M g = M a             Where T - M g is the net force on the bucket

T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2  = 36 Newtons

The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.

Explanation:

Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.

Answer:

Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.

Explanation:

[tex]

\mathbb \blue{Answer }[/tex]

[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric  \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]

[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]

,,,,,,,,,,,,,,,,,,,,,,,,,

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Here we go ~

[tex]\qquad \tt \dashrightarrow \:Electric \: \: current = \dfrac{ Charge }{time}[/tex]

[tex]\qquad \tt \dashrightarrow \:E= \dfrac{36 }{45}[/tex]

[tex]\qquad \tt \dashrightarrow \:E= 0.8 \: \: amp[/tex]

Mass, Speed and Kinetic Energy.The independent variable changed to . the dependent variable for both part i and part ii was .

We can solve this by analysing the choices and the relations between variables.

It's worth noting that Kinetic Energy is proportional to both speed and mass. Actually, Kinetic Energy is exactly proportional to those factors, meaning that the more mass or speed, the higher the Kinetic Energy.

Having said that, Part I and Part II must have speed and mass as indendepent variable, because Kinetic Energy depends on them.

Then, in the third question, the answer is Kinetic Energy becase that's the dependent variable in both cases Part I and Part II.

Just to remember, the Kinetic Energy is defined as

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

Where you can notice the relation between mass, speed and kinetic energy.

Therefore, the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).

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Answer

the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).

Explanation:

When the wave meets the condition of interference occurs. The interference effect is the sum of the individual wave amplitudes at each site where more than one wave is present.

The result of two or more wave trains flowing in opposite directions on a crossing or coinciding pathways. This phenomenon is known as the interference of waves.

When two wave pulses are traveling along a string toward each other. They meet and the phenomenon is occur known as interference.

Hence the phenomenon of interference occurs when two wave pulses are traveling along a string toward each other.

One wave on a string is moving toward the right and another is moving toward the left. When they meet in the middle, half of the cycle of the wave from the right overlaps with half of the cycle of the wave from the left.

The result is that the string gets flat when the two waves meet the condition of the interference of wave occurs.

Hence when the wave meets the condition of interference occurs.

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Answer:

Energy is always reused. Energy cannot be created or destroyed because it always turns into some other type of energy.

Explanation:

Answer:

Explanation:

Uranus takes about 84 years to circle the sun.

Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.

Answer: A CT scan involves multiple X-Ray images

Explanation:

I did it and it was correct

Answer:

Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.

Explanation:

The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.

As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.

In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.

Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

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Answer:

In giant molecular clouds

Explanation:

To find the stars that are just being born, one of the best places to search is giant molecular clouds.

An astronomical object known as a star is made up of a luminous plasma spheroid that is held together by gravity. The Sun is the star that is nearest to Earth. Other stars are also visible at night with the eye, but because of their great distances from Earth, they appear as stationary points of light.

Many of the brightest stars have names, and the most notable stars have been organized into constellations and asterisms. Star catalogs have been put out by astronomers that list the known stars and provide standardized stellar labels. An estimated 10²²–10²⁴ stars are alive in the observable cosmos.

These stars are all situated within the Milky Way galaxy, with only 4,000 of them being visible with the unaided eye.

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Answer:

Explanation:

We know the relation :

We are given that :

Hence, on substituting the values in the equation :

The given information is,

→ Mass = 2 kg

→ Acceleration= 8.3 m/s

→ Force = F (in Newton)

Now we have to find the,

→ Amount of force applied to the object.

Formula we use,

→ F = Mass × Acceleration

Then the amount of force will be,

→ F = Mass × Acceleration

→ F = 2 × 8.3

→ [ F = 16.6 N ]

Hence, the amount of force is 16.6 N.

The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.

In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.

The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.

From the given reaction,

HCl + NaOH --- NaCl + H₂O

HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.

When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.

When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.

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