A vendor hangs an 8.0 kg sign in front of his shop with a cable held away from the building by a lightweight pole. The pole is free to pivot about the end where it touches the wall, as shown in (Figure 1).

Answer:

if there isn't a shorting mechanism, the whole sets will be blown out several lamps and then shortened, the overall resistance of the remaining operating lamps will be decreased resulting in an increased working current that is adequate to blast the fuse

Answer:

0

Explanation:

she runs 2 whole laps around a 400 meter track, but she is always ending up back where she started, therefor there is no displacement.

No, the elastic potential energy stored in the pole of a pole vaulter is not the only type of potential energy involved in pole-vaulting.

In pole-vaulting, there are multiple forms of potential energy involved. While the elastic potential energy stored in the pole plays a crucial role, other forms of potential energy include gravitational potential energy and kinetic energy.

1. Elastic Potential Energy: The pole used in pole-vaulting is typically made of flexible materials, such as fiberglass or carbon fiber, which store elastic potential energy when bent or compressed. This stored energy is then released, propelling the vaulter upwards.

2. Gravitational Potential Energy: As the vaulter reaches the highest point of their vault, they have gained gravitational potential energy due to their increased height above the ground. This potential energy is converted into other forms of energy as the vaulter descends.

3. Kinetic Energy: Throughout the vaulting process, the vaulter's body also possesses kinetic energy, which is the energy of motion. The vaulter's initial speed and subsequent acceleration contribute to their kinetic energy, allowing them to gain momentum and clear the bar.

Therefore, while the elastic potential energy stored in the pole is an important component, there are other forms of potential energy involved in pole-vaulting, namely gravitational potential energy and kinetic energy.

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The ratio of the speed that maximizes the distance and the speed that minimizes the required power is 1.

Distance is the measurement of space between two objects or points. It is an important concept in mathematics, physics, and many other scientific fields. Distance can be measured in linear units such as meters, kilometers, feet, or miles. It can also be measured in angular units such as degrees, radians, or arcminutes. Distance can be calculated by using various formulas and calculations, such as the Pythagorean theorem or the distance formula.

The choice of w that will minimize the power required to keep moving at speed v is w = √(d/c). The speed u that will maximize the range is u = √(d/c) × v. The ratio of the speed that maximizes the distance and the speed that minimizes the required power is 1.

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Answer:

Capricorn what is yours

Answer:

leo

Explanation:

As the Earth moves closer to the Sun, the angular velocity of the Earth increases to keep its angular momentum constant. This means that the Earth's angular momentum when it is closest to the Sun is greater than when it is farthest from the Sun. Therefore, option (a) greater is the correct answer.

Angular momentum is constant when no external force acts on an object. The Sun's gravitational pull, which is an external force, causes the Earth's orbit to change, but the Earth's angular momentum stays constant.

The Earth's angular momentum changes as its distance from the Sun changes. The angular momentum of the Earth is inversely proportional to its distance from the Sun. As the Earth moves closer to the Sun, the angular velocity of the Earth increases to keep its angular momentum constant. This means that the Earth's angular momentum when it is closest to the Sun is greater than when it is farthest from the Sun.

option (a) greater is the correct answer

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Answer:

Newton's First Law of Motion (aka Law of Inertia)

Explanation:

Answer:

#A

Acceleration=a

\(\\ \tt\hookrightarrow a=\dfrac{v-u}{t}=\dfrac{8}{4}=2m/s^2\)

#B

\(\\ \tt\hookrightarrow a=\dfrac{0-8}{4}=\dfrac{-8}{4}=-2m/s^2\)

Answer(s):

Solution for Practice-A:

We know that:

Solution:

Hence, the acceleration is 2 m/s for practice A.

Solution for Practice B:

We know that:

Solution:

Hence, the acceleration is -2 m/s for practice B.

Hoped this helped!

Answer:

32.32857

Explanation:

Searched on the web

The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

Answer:

is known as an electrical induction.

The reason why the book does not slide off the teacher's hand when she tilts her hand forward is because of the force of friction between the surfaces of the book and the teacher's hand.

Friction is a force that resists the motion between two surfaces that are in contact. When the book is resting on the teacher's hand, the surfaces of the book and the hand are in contact with each other. When the teacher tilts her hand forward, the force of gravity tries to pull the book downward, but the force of friction between the book and the hand acts in the opposite direction, preventing the book from sliding off the hand.

The amount of friction between two surfaces depends on a few factors, such as the type of materials in contact, the roughness of the surfaces, and the force pressing the surfaces together. The force of friction increases as the force pressing the surfaces together increases. In this case, the weight of the book pressing down on the teacher's hand increases as the hand tilts forward, which increases the force of friction between the book and the hand, keeping the book in place.

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The vector electric field created by the charges q = 7.00 nC and -3.00 nC at the origin can be found by summing the electric field contributions from each charge.

To determine the vector electric field at the origin, we need to consider the electric field created by each individual charge and then add them together. The electric field created by a point charge q at a distance r from the charge is given by Coulomb's Law:

E = k * q / r^2

where E is the electric field, k is Coulomb's constant (8.99 x 10^9 N m^2/C^2), q is the charge, and r is the distance from the charge.

In this case, we have two charges, q1 = 7.00 nC and q2 = -3.00 nC. Since the charges are at the origin, the distance r from each charge to the origin is zero.

The electric field created by q1 at the origin is given by:

E1 = k * q1 / r1^2 = k * 7.00 nC / 0^2 = undefined

Similarly, the electric field created by q2 at the origin is:

E2 = k * q2 / r2^2 = k * (-3.00 nC) / 0^2 = undefined

Since the distances are zero, the electric fields calculated for each charge are undefined. This is because the concept of electric field requires a nonzero distance from the charge. Therefore, we cannot determine the vector electric field at the origin in this case.

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#SPJ11 electric field created by the charges q = 7.00 nC and -3.00 nC at the origin can be found by summing the electric field contributions from each charge.

To determine the vector electric field at the origin, we need to consider the electric field created by each individual charge and then add them together. The electric field created by a point charge q at a distance r from the charge is given by Coulomb's Law:

E = k * q / r^2

where E is the electric field, k is Coulomb's constant (8.99 x 10^9 N m^2/C^2), q is the charge, and r is the distance from the charge.

In this case, we have two charges, q1 = 7.00 nC and q2 = -3.00 nC. Since the charges are at the origin, the distance r from each charge to the origin is zero.

The electric field created by q1 at the origin is given by:

E1 = k * q1 / r1^2 = k * 7.00 nC / 0^2 = undefined

Similarly, the electric field created by q2 at the origin is:

E2 = k * q2 / r2^2 = k * (-3.00 nC) / 0^2 = undefined

Since the distances are zero, the electric fields calculated for each charge are undefined. This is because the concept of electric field requires a nonzero distance from the charge. Therefore, we cannot determine the vector electric field at the origin in this case.

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Answer:

If both the radius and frequency are doubled, then the tension is increased 8 times.

Explanation:

The radial acceleration (\(a_{r}\)), measured in meters per square second, experimented by the moving end of the string is determined by the following kinematic formula:

\(a_{r} = 4\pi^{2}\cdot f^{2}\cdot R\) (1)

Where:

\(f\) - Frequency, measured in hertz.

\(R\) - Radius of rotation, measured in meters.

From Second Newton's Law, the centripetal acceleration is due to the existence of tension (\(T\)), measured in newtons, through the string, then we derive the following model:

\(\Sigma F = T = m\cdot a_{r}\) (2)

Where \(m\) is the mass of the object, measured in kilograms.

By applying (1) in (2), we have the following formula:

\(T = 4\pi^{2}\cdot m\cdot f^{2}\cdot R\) (3)

From where we conclude that tension is directly proportional to the radius and the square of frequency. Then, if radius and frequency are doubled, then the ratio between tensions is:

\(\frac{T_{2}}{T_{1}} = \left(\frac{f_{2}}{f_{1}} \right)^{2}\cdot \left(\frac{R_{2}}{R_{1}} \right)\) (4)

\(\frac{T_{2}}{T_{1}} = 4\cdot 2\)

\(\frac{T_{2}}{T_{1}} = 8\)

If both the radius and frequency are doubled, then the tension is increased 8 times.

If both the radius and frequency are doubled, then the tension will be increased 8 times.

From kinematic formula:

\(\bold {a_r = 4\pi r^2 \times f^2 \times R^2}\) .............................. (1)

Where:  

f - Frequency,    

R - Radius of rotation,  

From Second Newton's Law,

\(\bold {\sum F = T = m\times a_r }\) ......................... (2)

Where

m is the mass of the object,

From equation 1 and 2,

\(\bold {T = m\times 4\pi r^2 \times f^2 \times R^2}\\\) .................... (3)

From equation, tension is directly proportional to the radius and the square of frequency.

Then, if radius and frequency are doubled, then the ratio between tensions is:

\(\bold {\dfrac {T_2}{T_1} = (\dfrac {F_2}{F_1})^2 \times \dfrac {R_2}{R_1} = 4 \times 2 = 8 }\)  

Therefore, If both the radius and frequency are doubled, then the tension will be increased 8 times.

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Answer:

The energy is not destroyed, the energy has been transformed into another kind of energy, in this case to heat with energy of 0,002 J

Explanation:

One of the fundamental principles of physics states that energy is neither created nor destroyed, it is only transformed.

In this case, when the ball with an energy of 1 J bounces on the ground, it loses an energy equivalent to 1-0.998 J = 0.002 J. This energy of 0.002 J is not destroyed in the process, but is transformed into another type of Energy. In this case, said energy has been converted to heat. A heat equivalent to 0.002 J of energy.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Translation to spanish

Uno de los principios fundamentales de la física afirma que la enegía no se crea ni se destruye, sólo se transforma.

En este caso, cuando la pelota con una energía de 1 J rebota en el suelo pierde una energía equivalente a 1-0,998 J = 0,002 J. Esta energía de 0,002 J no se destruye en el proceso, sino que se transforma en otro tipo de energía. En este caso dicha energía se ha convertido en calor. Un calor equivalente a 0,002 J de energía.

Answer:

highest at top

f=b

e=a=d

c

Explanation:

Answer:

T (Period) = 2 π (L / g)^1/2         for a simple pendulum

L = g * T^2 / (4 π^2)

L = 9.98 m/s^2 * 9 s^2 / 39.5 = 2.27 m

The magnitude of the girl's acceleration is determined as 0.12 m/s².

The magnitude of the girl's acceleration is calculated by applying Newton's second law of motion as follows;

F (net) = ma

where;

The mass of the girl = 35.7 kg

The net force on the girl = 4.35 N

The magnitude of the girl's acceleration is calculated as;

a = F / m

a = 4.35 N / 35.7 kg

a = 0.12 m/s²

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The face should be placed at 6.24 cm in order to form an upright image that is magnified by a factor of 1.7 when viewed in a 20-cm focal length concave mirror.

Given data:focal length of mirror, f = -20 cm.Magnification, m = 1.7Image formed is upright.

Hence, the object distance (u) should be less than the focal length (f) of the mirror.Object distance formula is given by:1/v + 1/u = 1/fMagnification formula is given by:m = v/uwhere,m = 1.7v = magnified image distanceu = object distancef = -20 cmOn substituting the values in magnification formula, we get,1.7 = v/u1.7u = v ...(1).

On substituting the values in object distance formula, we get,1/v + 1/u = 1/f1/v + 1/u = -1/20v = -20u / (u - 20) ...(2)Substituting the value of v from equation (1) in equation (2), we get:1/u + u / (1.7u - 20) = -1/20On solving the above equation, we get,u = 6.24 cm.

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part 1

mass = ρ x V

mass = 1739 kg/m³ x 3.8 km³ = 6608.2 kg

PE (potential energy)= mgh

PE = 6608.2 kg x 9.81 x 403

PE = 2.61 x 10⁷ J

part 2

megaton of TNT (Mt) =4.2 x 10¹⁵ J

convert PE to Mt:

2.61 x 10⁷ J : 4.2 x 10¹⁵ J = 6.21 x 10⁻⁹ Mt

The ostringstream member function "str" returns the contents of an ostringstream buffer as a string. Here's how you can use it:
1. Create an ostringstream object:
  ostringstream oss;
2. Write data to the ostringstream buffer using the insertion operator (<<):
  oss << "Hello";
  oss << " World";
3. Retrieve the contents of the buffer as a string using the "str" member function:
  string result = oss.str();
  The variable "result" will now contain the string "Hello World".

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Write code that inserts userItem into the output string stream itemsOSS  https://brainly.com/question/14546794

Answer:

False

True

False

True

False

True

Explanation:

Efficiency is the ratio of output to input. The input and output referred to are the energy input and the useful output or work output. Efficiency, as such, is not expressed in percentages but in the ratio of output to input. Here, we are given two engines, A and B, and we need to find their respective efficiencies.

First, let's look at the information we are given about the engines: Engine A receives three times more input heat than engine B. That is, if engine B receives an input heat energy of 1 J, engine A will receive 3 J of input heat.Engine A produces five times more work than engine B.

If engine B produces an output work of 1 J, engine A will produce 5 J of work.Engine A rejects two times more heat than engine B. If engine B rejects 1 J of heat energy, engine A will reject 2 J of heat energy. Now, let's find the efficiencies of the two engines.

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They make you have a slower reaction time

Answer:

Explanation:

Is beacuse of the air within our bodys is exerting the same pressure out wards so tjere is no pressure difference

Answer:

it is because our body itself is not  adept enough to resist the air pressure. For every reaction, there be an balanced opposite reaction according to Newton's law. namely, all forces such as air pressure are in proportion therefore we will not perceive air pressure which also means no net force.    

Explanation:

A child drops a bar of soap into a bath of water. This creates a wave that passes a fixed point twice every second and the waves are 0.25 m apart then the speed of the wave is 0.5 m/s.

When a child drops a bar of soap into a bath of water, it creates a wave that passes a fixed point twice every second and the waves are 0.25 m apart. The speed of this wave can be calculated using the following formula:

Speed = frequency × wavelength

Where: Frequency (f) = number of waves passing a fixed point per second Wavelength (λ) = distance between two consecutive crests or troughs of a wave.

Now, the frequency of the wave is given as twice every second, which means f = 2 Hz. The distance between two consecutive crests or troughs of a wave (wavelength) is given as 0.25 m.

Therefore, λ = 0.25 m. Substituting these values in the formula, we get: Speed = frequency × wavelength

Speed = 2 Hz × 0.25 m

Speed = 0.5 m/s

Therefore, the speed of the wave is 0.5 m/s.

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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.

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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