An inductor of 170 turns has a radius of 8 cm and a length of 24 cm. The permeability of free space is 1.25664 × 10−6 N/A 2 . Find the energy stored in it when the current is 0.7 A.
Answer in units of J.

Answer:

6.0cm

Explanation:

Given

focal length = 15.0cm

object distance = 10.0cm

Required

Image distance v

Using the formula

1/f = 1/u + 1/v

1/15 = 1/10+1/v

1/v = 1/15 + 1/10

1/v = 2+3/30

1/v = 5/30

v = 30/5

v = 6.0cm

Hence the image distance is 6.0cm

Answer:

6.0 (2 sig figs)

Explanation:

Is it General Physics? I had it and passed the Final Exam with an A in the beginning of July!

The frequency of the electromagnetic wave is given by;f = 4.59×10¹⁴ HzOutput power.

P = 10 W.Using Planck's equationE = hfwhere, E is the energy of each photon, f is the frequency of the wave and h is the Planck's constant which is 6.626×10⁻³⁴ Js. E=hf=(6.626×10⁻³⁴ Js)(4.59×10¹⁴ Hz) = 3.05×10⁻¹⁹ JThus, the number of photons N is given by;N = P/E...Equation [1]Using equation [1],N = (10 W)/(3.05×10⁻¹⁹ J)N = 3.28×10¹⁹ photons/min (multiply by 60s/min)N = 1.97×10²¹ photonsAnswer: A. 1.98×10²¹ Photons.

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Answer:

a hypothesis is a explanation made on the basis of limited evidence

Explanation:

Answer:

an hypothesis is an educated guess  based on what you already know

Explanation:

hope this helps

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If you are not part of the electrical ground current, it reduces the likelihood and severity of electrical injury, but it does not completely eliminate the risk.

For example, if you come into contact with an energized conductor or a high-voltage source, you can still experience electric shock or burns due to the flow of electrical current through your body. The severity of the injury may vary depending on factors such as the voltage, current, duration of contact, and the path the current takes through your body.

Additionally, electrical arcs or sparks can cause collateral injuries, such as burns, thermal injuries, or falls, which can occur even if you are not part of the electrical ground current.

It is important to exercise caution and follow proper electrical safety procedures to minimize the risk of electrical injury, regardless of your direct connection to the electrical ground current.

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The width of the box such that a 3.0 eV of energy excites an electron from ground level to the first excited level is 7.08 × 10⁻¹⁰ meters.

We'll be using the particle-in-a-box model to estimate the width L of the box.

We convert the energy from electron volts (eV) to Joules (J). Recall that 1 eV = 1.6 × 10⁻¹⁹ J:
  E = 3.0 eV × (1.6 × 10⁻¹⁹ J/eV) = 4.8 × 10⁻¹⁹ J

2. Apply the particle in a box formula:
  E = (n² × h²) / (8 × m × L²)

where E is the energy, n is the principal quantum number, h is the Planck's constant (6.626 × 10⁻³⁴ J.s), m is the mass of an electron (9.109 × 10⁻³¹ kg), and L is the width of the box.

3. Since the electron is excited to the first excited level, we have n = 2.

4. Rearrange the formula to solve for L:
  L² = (n² × h²) / (8 × m × E)

5. Plug in the values and solve for L:
  \(L^2 = (2^2 \times (6.626 \times 10^{-34} \ J.s)^2) / (8 \times (9.109 \times 10^{-31} \ kg) \times (4.8 \times 10^{-19}\  J))\)
\(L^2 = 5.02 \times 10^{-20} \ m^2\)

6. Calculate the square root of L² to find L:
  \(L = \sqrt{5.02 \times 10^{-20} \ m^2}\)
  \(L = 7.08 \times 10^{-10}\  m\)

So, the width L of the box is approximately 7.08 × 10⁻¹⁰ meters or 7.08 Å (angstroms).

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Metals are used for conductors for all of the above conductor applications.

option D is the correct answer.

Metals are excellent conductors of electricity and heat because their atoms form a matrix through which outside electrons can easily move.

Electrical conduction in metals must follow Ohm's Law, which states that the current flowing in an Ohmic conductor is directly proportional to the potential difference across the metal conductors or wires.

V = IR

where;

Metals are used for conductors for the following;

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Answer:

Explanation:

For A to become positively charged, a + charge must transfer from B to A.

The charge that must transfer for object A to become positively charged is the negative charge in object A.

Charging by conduction occurs when a charged object causes the flow of electron when it comes in contact with an uncharged object.

An object can either be negatively or positively charged. An object is said to be positively charged when it contains more protons than electron.

Therefore, for object A to be positively charged, the charge that must transfer for object A to become positively charged is the negative charge.

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Answer: B

Explanation: efficiency is the useful energy supplied; useful energy supplied doesn't not change,
work done stays constant

in order to to increase the power of the motor, time would have to be decreased to get the wanted result..

When he  increases the input power to the motor and repeats the experiment, work done stays the same but time taken decreases.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft.

To lift a load through a vertical distance of 2.0m, in the both cases same amount of work-done happens because the displacement is same.

But as the input power, in second case, increases but the efficiency of the motor does not change, the time taken decreases ( as time taken = work done/power)

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Answer:

Net force = 10 N in downward direction

Explanation:

Given that,

Upward force = 10 N

Downward force = 20 N

Let downward is negative and upward is positive.

Net force = 10+(-20)

= -10 N

So, the net force is 20 N and it is acting in downward direction.

When two charged plates are separated by a distance, the potential difference between the plates is 54 Volts.

The electric field intensity which does not increase or decrease with time or remain constant is called the uniform electric field.

Given is the plates separated by distance d = 15 cm =0.15 m, electric field E= 360 N/C.

The relation between the electric field and voltage is

E=V/d

Substitute the values into the expression to get the potential difference V,

V = 360 x 0.15

V = 54 Volts

Thus, the potential difference between the plates is 54 Volts.

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Answer:

I feel that people hurt the land and are destroying. I think they aren't using the land for the right reasons.

When an Olympic sprinter runs around the curve of a circular track with a radius of 36.5 m, they experience centripetal acceleration of 3.31m/s2.

Given that the runner's speed(v) = 11 m/s

Circular track radius (r) equals 36.5 meters

Centripetal acceleration (ac) is calculated as follows:

(11x11)/36.5 = 3.31 m/s2.

Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center. The centripetal acceleration, denoted by the symbol AC, has a magnitude equal to the square of the velocity of the body along the curve divided by the radius of the circle, denoted by the symbol r. This is also known as the formula ac = v2/r.

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Answer:

b.  In fission, the total mass of the reactants equals the total mass of the products.

Explanation:

In a nuclear reaction, the total mass of the reactants does not equal to the total mass of the products.

This is because mass is converted to energy in a nuclear reaction.

The percentage change in any economic variable, including the Consumer Price Index (CPI), is typically measured using the following equation:

Percentage Change = ((New Value - Old Value) / Old Value) * 100

This equation calculates the difference between the new value and the old value, divided by the old value, and then multiplied by 100 to express it as a percentage.

To specifically calculate the percentage change in the CPI, you would substitute the respective values of the CPI for "New Value" and "Old Value" in the equation. This allows you to determine the percentage change in the CPI over a given period, indicating the inflation or deflation rate in the economy.

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Answer:

C. Magnetic fields of atoms aligning

Answer:

c

Explanation:

a pex

Answer:

A  mercury barometer is a device use to measure stomspheric pressure and is constructed as following:

The position of tube creates vacuum between the closed end of the tube and liquid surface and the Mercury has high density that is why used as the liquid to measure pressure.

Answer:

metre

Explanation:

the metre is the standard unit of measurement for those distances

_______________________________________________________

Based on the 'Law of Conversation of Energy', potential energy is equal to thermal energy plus kinetic energy.

In summary - Option C is correct

________________________________________________________

Hope this helps!

The conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.

The conservation of energy refers that the total energy present in an isolated system remains constant. It means that a system itself can not generate or consume energy. Energy actually transferred from one form to another.

Conservation of energy: tell us that energy can neither be created nor destroyed, but can be transferred from one form to another. e.g Chemical to mechanical ( combustion of fuel in the vehicle to achieve mechanical work.

The conservation of energy is defined by the first law of thermodynamics. Which states that we can not generate energy or can not destroy energy but only can transfer it from one form to another. Like chemical to heat, Kinetic to potential, etc.

Therefore, the conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.

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It is not possible to guess if the electroscope is charged or neutral just by looking at it.

An electroscope is a tool used to find electrical charges on objects. At the top is a conducting sphere, and there are metal leaves and a rod inside. This is enclosed in a glass jar. The electroscope's top is approached by an electrically charged object. As a result, electrons move to or away from the charged item.

The leaves reject one another and move apart if the electroscope contains charge. As a result, both leaves and the metallic sphere are electrically charged. The leaves open up and repel one another when they have the same charge. No change occurs in neutral state.

As the leaves have similar charges and repel one another whether it is positive or negative charge, we cannot tell from an electroscope alone what kind of charge it has. Thus, we cannot differentiate the charge of electroscope.

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The coefficient of friction = 0.34 between the rope and the support.

This type of question can be solved using Capstan's equation,

Capstan's equation is generally used to calculate the friction of the coefficients or the yarns. Represented as-

\(T_{1} = T_{0}e^{u}\).

Now according to the term coefficient of friction, we calculate the friction between any two surfaces. It is also referred to as the ratio of the resistive force to the normal force.

The Capstain's equation is given by-

\(T_{load} = T_{hold} e^{uo}\)

u is given as μ and o denotes Φ

the load = 7000

hold support is 100N

Φ = 2\(\pi\) for the whole rotation

Since the rope is wrapped 2 times = 4\(\pi\)

7000 = 100\(e^{u4\pi }\)

log on both sides

⇒ u = log 7000/ 100*4\(\pi\)

⇒ u = 0.338

Therefore, the coefficient of friction between rope and support = 0.34

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Answer:

The battery it consider as one of the circuits elements.

Explanation:

The ratio of the areas is the square of the ratio of the radii.

A/A = 3.16² = 9.99

The ratio of the volumes is the cube of the ratio of the radii.

V/V = 3.16³ = 31.6

Answer:

If the car comes to a sudden stop, your body tends to keep moving forward.

Explanation:

Answer:

Red shift supports the big bang theory. ... The light from distant galaxies is red shifted (this tells us the galaxies are moving away from us) and the further away the galaxy the greater the red shift (this tells us that the more distant the galaxy the faster it is moving). Constellations look like they are moving because earth is rotating on it's axis.

May I have brainliest, please?

Newly formed neutron stars have extremely strong magnetic fields due to the combination of their rapid rotation, high density, and the presence of charged particles within their composition. When a massive star reaches the end of its life and undergoes a supernova explosion, its core collapses and forms a highly compact and dense neutron star.

This process conserves the original star's magnetic field, which becomes amplified due to the compression.

The rapid rotation of the newly formed neutron star also contributes to the generation of a powerful magnetic field. The movement of charged particles within the dense neutron star creates electric currents, and as the star rotates, these currents generate a magnetic field.

In summary, newly formed neutron stars have extremely strong magnetic fields because of their rapid rotation, high density, and the presence of charged particles, which together create and amplify the magnetic field during the star's formation.

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The disappearance of Saturn's rings every 15 years is a phenomenon known as the ring plane crossing. This occurs when Saturn's orbit around the sun brings the planet's rings edge-on to the Earth, making them difficult to observe from our perspective.

The rings themselves do not actually disappear, but rather become much thinner and more difficult to see. The ring plane crossing occurs because Saturn's axis of rotation is tilted with respect to its orbit around the sun, causing the rings to appear at different angles as the planet moves in its orbit.

This means that every 15 years, Earth passes through the plane of Saturn's rings, causing them to appear edge-on and less visible from our point of view.

During the ring plane crossing, scientists can study the rings using different techniques, such as observing how the rings affect the light of background stars as they pass behind them. This can provide valuable information about the composition and structure of the rings, as well as their origins and evolution over time.

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As we see in the scatterplot graph and the briefing given below the most appropriate option is A-As age increases, weight increases.

If you follow the arrow's trajectory, your finger will move to the right, increasing age (on the horizontal axis).

Additionally, as your finger rises, the weight (on the vertical axis) does as well.

Age and weight increase in tandem since both processes are ongoing.

The association between two numerical variables measured for the same individuals is displayed in a scatterplot. One variable's values are displayed on the horizontal axis, and the other variable's values are displayed on the vertical axis. On the graph, each individual in the data is represented by a point.

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The complete question is-

Analyze the scatterplot graph.

Which trend does the graph show?

A-As age increases, weight increases.

B-As weight decreases, age increases.

C-As age increases, weight remains the same.

D-As weight increases, age remains the same.

If the drag force is increased by a factor of 4 , then the power is increased by a factor of 8 .

What is Power ?

The term Power is defined as the rate of energy release , It is the rate of energy release .

The common unit used for the Power is Watt (W) .

the formula for Power is ⇒ Power = Force × Velocity

Since speed is doubled , So , \(V_{new}\) = 2V

and the force is increased by a factor of 4 , that is \(F_{new}\) = 4F .

According to the question ,

\(P_{new}\) = \(V_{new}\) × \(F_{new}\)

Substituting the values ,

we get ,

\(P_{new}\) = 2V × 4F

= 8( V × F )

\(P_{new}\) = 8×P .

Therefore, the power is increased by a factor of 8 , the correct option is (c) .

The given question is incomplete , the complete question is

Most of the energy you expend in cycling is dissipated by the drag force. If you double your speed, you increase the drag force by a factor of 4. This increases the power to cycle at this greater speed by what factor ?

(a) 2

(b) 4

(c) 8

(d) 16

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Answer:

2.97 meters

9.85 m/s^2

Explanation:

Given that :

Period (T1) = 3.45 seconds

When length , l is shortened by 1m, period (T2) = 2.81 seconds

Using the relation :

T = 2π√l/g

g = acceleration due to gravity

T1 = 2π√L/g - - - - (1)

Period 2:

x = shortened length = 1m

T2 = 2π√L-x/g - - - (2)

Square both sides

T1² = (2π)² L/g - - - (3)

T2² = (2π)² L-x/g - - (4)

Divide 3 and 4

(T2/T1)² = (L-x) / L

(2.81/3.45)^2 = (L - 1) / L

0.6633984 = (L - 1) / L

0.6633984L = L - 1

0.6633984L - L = - 1

−0.336601L = - 1

L = 1 / 0.336601

L = 2.9708764

Length = 2.97 meters

Acceleration due to gravity :

g = L(2π/T1)^2

g = 2.97(2π / 3.45)^2

g = 2.97 * 3.3168172

g = 9.8509

g = 9.85 m/s^2

g