the on-axis magnetic field strength 14 cm from a small bar magnet is 4.9 μt . What is the bar magnet's magnetic dipole moment? b)What is the on-axis field strength 20 cm from the magnet?

Answer:

See the explanation below

Explanation:

Energy can neither be created nor destroyed but can be transformed from one form to another.

When we eat food the chemical energy in the food is transformed to kinetic energy that enables us to do work in the laboratory

Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

So, the correct answers are:
i) (a)
ii) (a)
iii) (b)
iv) (a)
v) (a)
vi) (b)


i) The impact caused by the object carrying the most kinetic energy would be represented by option (a).

ii) The impact that would produce the largest crater would also be represented by option (a).

iii) The impact that would be the most unusual or rarest would be represented by option (b).

iv) The impact that would sound the loudest in Las Cruces would be represented by option (a).

v) The impact that would produce the largest earthquake in Las Cruces would be represented by option (a).

vi) The impact that would disturb the air the most in Las Cruces would be represented by option (b).

So, the correct answers are:
i) (a)
ii) (a)
iii) (b)
iv) (a)
v) (a)
vi) (b)

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A force of constant direction and constant magnitude Fis exerted on the disk. A solid disk of mass M radius R and rotational inertia I is free to rotate.

Direction is defined as the path that something takes, the path that must be taken to reach a specific place, the way in which something is starting to develop or the way you are facing. An example of direction is when you go right instead of left.

Think about and visualise the route. Jot down short notes. Check over the route  your mind again, to make sure your steps are logical and nothing is left out. Plan what direction, distance and landmark words to use.

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Here is your Answer:-

Conduction is how heat transfers through direct contact with objects that are touching. Any time that two objects or substances touch, the hotter object passes heat to the cooler object. (That hot sand passed the heat energy right into my poor feet)!

Answer:

Conduction is the transfer of thermal energy from one object to another through the movement of molecules. Heat flows from one molecule to another because the particles are in direct contact with one another.

In physics, there are certain properties that are considered absolute and independent of frame of reference. These properties include the speed of light, the laws of thermodynamics, and the principle of conservation of energy.

The speed of light is an absolute property because it remains constant regardless of the observer's motion or frame of reference. This was first demonstrated by the famous Michelson-Morley experiment, which showed that the speed of light is the same in all directions and at all times. This property forms the basis of Einstein's theory of relativity, which has revolutionized our understanding of the universe.

The laws of thermodynamics are also considered absolute because they describe fundamental principles of nature that hold true under all conditions. These laws govern the behavior of energy in all physical systems and are essential for understanding everything from the behavior of atoms to the workings of the universe itself.

Finally, the principle of conservation of energy is another absolute property that is independent of frame of reference. This principle states that energy cannot be created or destroyed, only transformed from one form to another. This principle has been extensively tested and confirmed in countless experiments, and forms the basis of our understanding of energy and its role in the physical world.

Overall, these absolute properties are fundamental to our understanding of physics and the natural world, and form the basis of many of our most important scientific theories and discoveries.

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The sonar computers receiving a reflection from the destroyer at a frequency of 19 kilo-hertz can report useful information about the motion of the destroyer. Specifically, the computer can determine the speed and direction of the destroyer based on the frequency shift of the reflected sound waves.

The sonar system works by sending out sound waves, which then bounce off of objects and return to the system. The frequency of the reflected sound waves is affected by the motion of the object that they bounce off of. In this case, the frequency shift of the reflected sound waves at 19 kilo-hertz can help the sonar computer determine the Doppler shift caused by the motion of the destroyer. This information can then be used to determine the speed and direction of the destroyer.
The computer uses the Doppler effect to make this analysis. The Doppler effect refers to the change in frequency of sound waves caused by the motion of the object emitting or reflecting the waves. In this case, the change in frequency of the reflected sound waves can be used to determine the motion of the destroyer.
In summary, the sonar computers can use the Doppler effect to analyze the reflection of sound waves from the destroyer and determine its motion, including its speed and direction.

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5) Spinning blades may injure or kill aquatic species.

6)  During high tide, the ocean's waters creep up the shore, deepening the water. This happens as a body of water gets closer to one of the two bulges created by the moon's gravitational force

The formula xy = k or y = kx can be used to represent an inverse variation. If a nonzero constant k exists such that xy = k or y = kx where x≠ 0, y ≠ 0, then y varies inversely as x.

A variable is inversely varying with respect to another variable when the term "inverse variation" is used. It symbolizes how two quantities are inversely related. This means that one variable is inversely proportional to another. Relationship in mathematics between two variables that can be described by an equation in which the sum of the two variables equals a constant.

As one quantity rises, the other falls for two quantities with inverse variation. For instance, as your speed increases while travelling to a specific location, it will take you less time to get there.

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Answer:

V=IR

25. =0.5 ×RESISTANCE

RESISTANCE=25/0.5

=50 ohms

answer is option B

Answer:

weight.................

Electrical energy can be described as the energy transferred through the movement of charges, typically in the form of an electric current

define  Electrical energy  ?

Electrical energy is a form of energy that results from the movement of electric charges, typically in the form of an electric current. It is the energy that is transferred or converted from electric potential energy, which is the energy stored in a system due to the separation of charges. Electrical energy can be harnessed and used for various purposes, such as lighting, heating, powering electronic devices, and driving motors. It is an essential form of energy in modern society and plays a crucial role in many aspects of daily life.

The correct answer is 1. Electrical energy can be described as the energy transferred through the movement of charges, typically in the form of an electric current. Options 2, 3, and 4 refer to other forms of energy related to electricity but do not fully describe electrical energy itself.

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The mirror is a concave mirror if the focal length value is negative (since the focal length is negative for a concave mirror). As a result, the focal length is 2.206 cm, and the image distance is -1.6 cm.

The concave mirror's focus will create a sharp image of a window or tree. Scale can be used to measure distance. It will reveal to us the concave mirror's approximate focal length.

1/f = 1/d_i + 1/d_o

1/f = 1/d_i + 1/d_o

1/f = 1/-1.6 cm + 1/5.8 cm

\(1/f = -0.625 cm^-1 + 0.172 cm^-1\)

\(1/f = -0.453 cm^-1\)

\(f = -2.206 cm^-1\)

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Answer:

B - 0.18N/cm

Explanation:

The spring formula:

      Force =  - (spring constant) · (distance stretched or squashed)

          6 N  =  - (spring constant) · (33 cm)

                  =  - (0.33 m) · (spring constant)

         Spring constant  =   - (6 N) / (0.33 m)

                                     =    - 18.18 N/meter .

The negative signs mean that the spring always wants to go in the

opposite direction from where you forced it, and return to its relaxed

length.  If you stretch it, it tries to get shorter, and if you compress it,

it tries to get longer.

Part 1: The number of pathways in a circuit determines the possible routes for electric current to flow.

There are maximum of five pathways in this circuit, depending on its complexity and the arrangement of components.

Part 2: Determining whether the circuit is series or parallel requires more information.

In a series circuit, components are connected in a single path, and the current flows through each component sequentially.

If the circuit has only one pathway (zero or one pathway), it suggests a series circuit.

However, if the circuit has multiple pathways (two or more pathways), it indicates a parallel circuit.

To conclusively determine the circuit's nature, we need to analyze the circuit diagram or obtain additional details regarding the component connections and their interactions.

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The expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by E = Y * e * ln(L) * A

The work done to stretch the wire can be calculated by integrating the force applied over the displacement. In this case, the force applied is the tension (T) in the wire, and the displacement is the change in length (ΔL) from the original length (L) to the stretched length (L + ΔL).

The tension in the wire is given by Hooke's law, which states that the tension is proportional to the extension of the wire:

T = Y * (ΔL / L)

where Y is the Young's modulus of the material of the wire.

Now, let's calculate the work done to stretch the wire:

dW = T * dL

Integrating this expression from L to L + ΔL:

W = ∫ T * dL = ∫ Y * (ΔL / L) * dL

W = Y * ΔL * ∫ (dL / L)

W = Y * ΔL * ln(L) + C

Here, C is the constant of integration. Since the energy stored in the wire is zero when it is unstretched (ΔL = 0), we can set C = 0.

Finally, the expression for the energy stored in the wire (E) is:

E = W = Y * ΔL * ln(L)

or, if we substitute the cross-sectional area (A) and strain (e) of the wire, where e = ΔL / L:

E = Y * e * ln(L) * A

Thus, the expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by:

E = Y * e * ln(L) * A

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The kinetic energy of the photoelectrons emitted is calculated as 2.23 *10^-19 J .

Photoelectrons are the electrons which are produced when energetic photon of radiation strikes a molecule. Photoelectron is an electron ejected from atom, molecule, or solid by an incident photon.

In terms of behavior and properties, photoelectrons are no different from other electrons.

E= h c/λ

= 6.6 *10^-34 * 3 * 10^8/400 * 10^-9

= 4.95 *10^-19 J

Work function = 1.7 eV= 1.7 * 1.6 *10^-19

= 2.72 *10^-19 J

Hence,  kinetic energy of photo electrons emitted will be;

= 4.95 *10^-19 J -  2.72 *10^-19 J

kinetic energy = 2.23 *10^-19 J

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Question 1.

A stereo with a resistance of 65 Ω is connected across a potential difference of 140 V. What is the current in this device?

Answer :-

Resistance = 65 Ω

Potential difference = 140V

where, I denotes Current, V denotes potential difference and R denotes the resistance

substituting the values,

\(\: :\implies \) I = 140/65

\(\: :\implies \) I = 2.15 Ampere

Therefore, 2.15 ampere is the required current in the device.

Question 2

A 1150 W electric toaster operates on a household circuit of 100 V. What is the resistance of the wire that makes up the heating element of the toaster?

Answer :-

We know that,

where, P denotes Power , I denotes Current and V denotes the potential difference.

Substituting the values,

\(\: :\implies \) 1150 = I × 110

\(\: :\implies \) 1150/100 = I

\(\: :\implies \) 11.5 = I

Required current = 11.5 A

Now,

where, R denotes resistance, V denotes potential difference

and I denotes the Current.

Substituting the values,

\(\: :\implies \) R = 110/1.5

\(\: :\implies \) R = 8.69 Ω

Therefore, 8.69Ω is the required resistance of the wire that makes up the heating element of the toaster

A thousand kilo meters length of cable is laid between two power stations. If the conductivity of the material of the cable is 5.9 x 10⁷ Q-¹ m-¹ and its diameter is 10 cm, the resistance of the cable is 113.69 Ω.

If the free electron density is 8.45 x 10²⁸ m-³ and the current carried is 10000A, the drift velocity of the electrons is 0.298 m/s.

Their mobility is 262.41 m²/(V s). and the power dissipated in the cable is 113.69 x 10⁶ W.

To calculate the resistance of the cable, we can use the formula:

Resistance (R) = (ρ * L) / A

where ρ is the resistivity of the material, L is the length of the cable, and A is the cross-sectional area of the cable.

Length of the cable (L) = 1000 km = 1000 * 1000 m

Conductivity of the material (σ) = 5.9 x 10⁷ Q⁻¹ m⁻¹

Diameter of the cable (d) = 10 cm = 0.1 m

First, let's calculate the cross-sectional area (A) of the cable:

A = π * (d/2)²

A = π * (0.1/2)²

A = π * (0.05)²

Now, we can calculate the resistance (R) of the cable:

R = (ρ * L) / A

R = (1/σ * L) / A

R = (1 / (5.9x10⁷) * (1000 * 1000)) / (π * (0.05)²)

Calculating this expression, we get:

R ≈ 113.69 Ω.

Next, let's calculate the drift velocity (\(v_d\)) of the electrons in the cable. The drift velocity is given by the formula:

\(v_d\) = I / (n * A * q)

where I is the current carried, n is the free electron density, A is the cross-sectional area, and q is the charge of an electron.

Current carried (I) = 10000 A

Free electron density (n) = 8.45 x 10²⁸ m⁻³

Cross-sectional area (A) = π * (0.05)²

Charge of an electron (q) = 1.6 x 10⁻¹⁹ C

Substituting these values into the formula, we get:

\(v_d\) = 10000 / (8.45 x 10²⁸ * π * (0.05)² * 1.6 x 10⁻¹⁹)

Calculating this expression, we get:

\(v_d\) = 0.298 m/s.

Next, let's calculate the mobility (μ) of the electrons. The mobility is given by the formula:

μ = \(v_d\) / E

where E is the electric field strength.

Since the power dissipated in the cable is not given, we cannot directly calculate the electric field strength. However, if we assume that the power dissipated in the cable is equal to the power input (P), we can use the formula:

P = I² * R

Substituting the given values, we get:

P = 10000² * 113.69

Calculating this expression, we get:

P = 113.69 x 10⁶ W

Now, assuming this power is evenly distributed over the length of the cable, we can calculate the electric field strength (E) using the formula:

P = E * I * L

Substituting the values, we get:

113.69 x 10⁶ = E * 10000 * (1000 * 1000)

Simplifying this expression, we find:

E ≈ 1.137 x 10⁻³ V/m

Finally, we can calculate the mobility (μ):

μ = \(v_d\) / E

μ = 0.298 / (1.137 x 10⁻³)

Calculating this expression, we get:

μ ≈ 262.41 m²/(V s).

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The value of the coefficient of kinetic friction is 0.32.

The value of the coefficient of friction is calculated by applying Newton's second law of motion as shown below.

Ff = ma

where;

μmg cosθ = ma

μg cosθ = a

μ = a / ( g cosθ )

where;

The value of the coefficient of kinetic friction is calculated as;

μ =  ( 2.361 m/s² )  / ( 9.8 m/s² x  cos41 )

μ = 0.32

Thus, the value of the coefficient of kinetic friction between the block and the inclined ramp is a function of the acceleration of the block and the angle of inclination of the ramp.

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The fundamental frequency, wavelength of the wave, and mass per unit

length of the string, determines the tension in the string.

Reasons:

From a similar question, we have;

Fundamental frequency, f₁ = 146.8 Hz

Oscillating length on the D-string, λ₁ = 0.61 m

Mass of the string = 1.5 × 10⁻³ kg.

We have;

\(\displaystyle f_1 \cdot \lambda _1 =\mathbf{ \sqrt{\frac{T}{m/L} }}\)

Therefore;

\(\displaystyle T = \mathbf{\frac{f_1^2 \cdot \lambda _1^2 \cdot m }{L}}\)

Which gives;

\(\displaystyle T = \frac{146.8^2 \times 0.61^2 \times 1.5 \times 10^{-3} }{0.61 } \approx \mathbf{19.718}\)

The tension to which the D-string must be tuned, T ≈ 19.718 Newtons

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The parameters given in a similar question obtained online are;

The fundamental frequency of the tone, f₁ = 146.8 Hz

The oscillating length on the D-string, λ₁ = 0.61 m

The mass of the string = 1.5 × 10⁻³ kg.

The one component of the material of the milky way galaxy that prevents us from seeing and photographing the galactic center at optical wavelengths is interstellar dust.

The Milky Way is a vast collection of stars dust and gas. It is called a spiral galaxy because it looks like a spinning windmill when viewed from above or below. The Sun is in one of the spiral arms about 25,000 light-years away from the center of the galaxy. Astronomers have released the first images of a supermassive black hole at the center of our Milky Way.

The results provide overwhelming evidence that this object is indeed a black hole and provide valuable clues about the workings of the giant galaxies thought to reside at the center of most galaxies. This extreme environment exposes you to intense UV and X-rays. But much of this activity is obscured from view by a huge plume of interstellar dust. The center of our Milky Way is hidden from the prying eyes of optical telescopes by clouds of dust and gas.

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Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question

force = 6 N

distance = 5 m

We have

workdone = 6 × 5 = 30

We have the final answer as

Hope this helps you

When you ride your scooter, you have momentum which is determined by your mass and velocity. Momentum is a vector quantity, meaning it has both magnitude and direction.

When you ride twice as fast, you have twice the velocity, which results in a change in momentum.The relationship between velocity and momentum is direct. Therefore, when you ride twice as fast, you have twice the momentum. This means that the correct answer is option c. You will have twice the momentum when you ride twice as fast on your scooter.It is important to note that momentum is conserved in a closed system, which means that the total momentum before and after the event remains the same.

Therefore, if you were to ride your scooter into a wall, your momentum would be transferred to the wall, causing you to stop abruptly. When you ride your scooter, you have momentum. Momentum is the product of an object's mass and velocity (p = mv). If you ride twice as fast, your velocity doubles. In this case, your momentum also doubles, since the mass remains the same. Therefore, the correct answer is c. twice the momentum.

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Given parameters:

Mass of Dogsled  = 600kg

Force = 150N

Unknown:

Acceleration of the sled = ?

Solution:

Force is a physical quantity and can be expressed as a product of mass and acceleration.

       Force  = mass x acceleration

   Since acceleration is unknown, we input the parameters and solve for it;

      150  = 600 x acceleration

     Acceleration  = \(\frac{150}{600}\) = 0.25m/s²

The acceleration of the sled is 0.25m/s²

Answer:

2 hours

Explanation: