Which of the following statements are true?

Positively charged objects attract other positively charged objects.
Negatively charged objects attract other negatively charged objects.
Positively charged objects attract negatively charged objects.
Negatively charged objects attract neutral objects.
Positively charged objects attract neutral objects.

Answer:

geothermal energy is the answer

To find the volume of the solid obtained by rotating the region, we will need some more information, such as the function or shape of the region, the axis of rotation, and the interval of rotation. The terms you should be familiar with are:
1. Volume: The measure of the amount of space occupied by a solid figure.
2. Solid: A three-dimensional geometric figure.
3. Rotation: Turning a shape around a fixed point or axis.
4. Region: An area enclosed by a curve or boundaries.
5. Axis of rotation: The line around which the region is rotated to form the solid.
Once you provide these details, I'd be happy to help you find the volume of the solid obtained by rotating the region.

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Answer:

Gravity

Explanation:

After it reaches it's highest point, it falls back down because of gravity.

Answer:

6

Explanation:

Answer:

6 m/s

Explanation:

Velocity = Distance/Time

              = 84 meters/14 seconds

              = 6 m/s

Hope this helps! :)

The momentum of the kid weighing 30kg is 210kgm/s.

Momentum in physics refers to the tendency of a body to maintain its inertial motion i.e. the product of its mass and velocity, or the vector sum of the products of its masses and velocities.

According to this question, a 30kg kid on a bike is moving in the positive direction at 7 m/s. The momentum is calculated thus;

Momentum = 30kg × 7m/s = 210kgm/s

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When a wire coil is held so that its plane is perpendicular to a magnetic field, an electromotive force (emf) is induced in the coil. This phenomenon is known as electromagnetic induction and is described by Faraday's law of electromagnetic induction.

According to Faraday's law, the magnitude of the induced emf can be calculated using the equation:

emf = -N * dΦ/dt

where emf is the induced electromotive force, N is the number of turns in the coil, and dΦ/dt is the rate of change of the magnetic flux through the coil.

The direction of the induced emf follows Lenz's law, which states that the induced current will flow in a direction that opposes the change in magnetic flux.

It's important to note that the magnetic field must be changing in order to induce an emf in the coil. This can be achieved by moving the coil or changing the magnetic field strength. Additionally, the coil must be a closed circuit for the induced emf to generate a current.

If you have specific values for the number of turns in the coil, the magnetic field strength, and the rate of change of magnetic flux, I can assist you in calculating the induced emf.

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The statement that is true about an orbit with an eccentricity of almost 1 is:

C) The orbit is a very long and narrow ellipse.

The eccentricity of an orbit is a measure of how elongated or stretched out the shape of the orbit is. The eccentricity of an orbit ranges from 0 to 1, with 0 representing a perfectly circular orbit and 1 representing a highly elongated or eccentric orbit.

When the eccentricity is almost 1, it indicates that the orbit is highly elongated or stretched out. This means that the orbit is no longer close to being circular but takes on the form of a long and narrow ellipse. The closer the eccentricity is to 1, the more elongated the orbit becomes. Therefore, option C, stating that the orbit is a very long and narrow ellipse, is the correct statement for an orbit with an eccentricity of almost 1.

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Answer:

Diffraction

Explanation:

I took the test and got it right.

Answer:

D

Explanation:

Answer: The equation that relates wavelength and frequency for electromagnetic waves is: λν=c where λ is the wavelength, ν is the frequency and c is the speed of light.

10/0.5=20 meter.

Explanation:

The speed of a wave has a wavelength of 0.5 m/s and a frequency of 2 hz is   0.25 m.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a Transverse wave.

The relation between velocity, frequency  and wavelength is,

c = λν

Where λ is wavelength, ν is frequency and c is velocity.

Given,

c = 0.5 m/s

ν = 2 hz

λ = ?

Putting all the values in the equation,

0.5 = 2λ

λ = 0.5/2 = 0.25 m

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Answer:

The Equivalence Principle of Gravity

Explanation:

The fact that objects fall to earth at the same speed is called the Equivalence Principle of Gravity.

According to the Equivalence Principle of Gravity, all things fall at the same rate when there is little to no air resistance. The value of the acceleration caused by gravity is demonstrated by the force of gravity equation to be a constant that is independent of the mass of the item.

According to Einstein's equivalence principle, it is unnecessary to distinguish between gravitational and inertial forces because they are comparable in nature.

Therefore, the Equivalence Principle of Gravity states that all objects descend to Earth at the same rate.

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The speed of the three coupled cars after the collision is 1.8m/s.

The mass of the railroad car is given to be 2 x 10⁴ kg and moving with 3m/s speed.

The railroad car collides and coupled with to coupled railroad cars that has the same mass as that of a single car and they are moving in the same direction with a speed of 1.2m/s.

As we know that the linear momentum will be conserved, so, we can write,

Initial Momentum = final momentum

(2 x 10⁴ x 3) + (2 x 2 x 10⁴ x 1.2) = (3 x 2 x 10⁴)V

V is the final speed of the coupled railroad cars.

V = 5.4/3

V = 1.8 m/s

So, the speed of the coupled railroad cars is 1.8m/s.

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The time required for the object to hit the ground after the string breaks, we can use the equation of motion in the vertical direction. Since the object is initially at height h above the ground and is in free fall.

The equation can be written as:

h = (1/2)gt^2

Solving for t:

t = sqrt((2h) / g)

So, the time required for the object to hit the ground after the string breaks is given by the square root of 2h divided by g.

The horizontal distance the object travels from the time the string breaks until it hits the ground, we can use the horizontal velocity of the object. The horizontal velocity remains constant since there is no horizontal force acting on the object.

The horizontal distance can be calculated using the equation:

d = v * t

where v is the horizontal velocity and t is the time calculated previously.

The tension in the string just before it breaks can be determined using the centripetal force required to keep the object in circular motion. The tension in the string provides this force. The centripetal force can be calculated using the equation:

F = (M * v^2) / R

where M is the mass of the object, v is the speed of the object, and R is the radius of the circular path.

So, the tension in the string just before it breaks is given by the mass of the object multiplied by the square of its speed, divided by the radius of the circular path.

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If a toy rocket is launched vertically and rises to a height of 250 meters, then the initial velocity of the toy rocket would be 70 m / s.

There are three equations of motion given by Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem, a toy rocket is launched vertically and rises to a height of 250 meters, we have to find the initial velocity of the launch,

By using the third equation of motion given by Newton,

v² - u² = 2×a×s

0² - u² = 2×(-9.81)×250

u² = 4905

u = 70 m / s

Thus, the initial velocity of the toy rocket would be 70 m / s.

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The total kinetic energy before the collision is 0.8 J and the total kinetic energy after the collision is 3.3375 J.

Kinetic energy is the energy of motion. It is the energy an object has due to its motion. Kinetic energy is also known as “dynamic energy” and is equal to the work done on an object to move it at a certain speed. Kinetic energy is a form of energy that is directly proportional to the mass of the object and to the square of its velocity.

The collision between block A and block B is an elastic collision. This means that the total kinetic energy of the two blocks before the collision is equal to the total kinetic energy of the two blocks after the collision.
Before the collision, block A has a kinetic energy of KE = 0.5mv^2 = 0.5 x 0.10 x (4.0)^2 = 0.8 J.
After the collision, block A has a kinetic energy of KE = 0.5mv^2 = 0.5 x 0.10 x (1.5)^2 = 0.3375 J.
Block B has a kinetic energy of KE = 0.5mv^2 = 0.5 x 0.15 x (0)^2 = 0 J before the collision.
After the collision, block B has a kinetic energy of KE = 0.5mv^2 = 0.5 x 0.15 x (4.0)^2 = 3 J.
Therefore, the total kinetic energy before the collision is 0.8 J and the total kinetic energy after the collision is 3.3375 J. Since the total kinetic energy before and after the collision is the same, the collision is elastic.

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Quasars are objects that looked mostly like stars when first discovered but turned out to be much farther away and trillions of times brighter than stars.

A quasar is an astronomical object with a very high brightness that may be found in some galaxies' centers and is fueled by gas spiraling quickly into an enormous black hole.

Compact objects called quasars are found outside of our galaxy. They shine more brightly than 100 galaxies put together, but since they are so far away, it takes several billion years for their light to reach Earth.

This suggests that most galaxies, including the Milky Way, may have experienced an active phase during which they appeared as quasars or another type of active galaxy depending on the black-hole mass and accretion rate, and are now quiescent because they lack a supply of matter to feed into their central black-hole.

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Zero, neutral means no extra electrons.

Depending on the asteroid's velocity, a launch speed greater than 6 m/s is necessary relative to you.

The needed launch speed is more than 6 m/s with respect to you. This is due to the fact that the rock will have a certain velocity relative to the asteroid if it is launched at a speed of 6 m/s relative to you. When the rock is very distant from the asteroid, this velocity, along with the asteroid's velocity, will cause it to have a velocity greater than 6 m/s.

We can use the relative velocity equation to determine the necessary launch speed:

Relative Velocity = Asteroid Velocity - Launch Velocity

Therefore, we can get the launch velocity by solving for the following equation: If we want the rock to have a relative velocity of 6 m/s when it is very distant from the asteroid:

Launch Velocity = Asteroid Velocity + Relative Velocity

= 6 m/s + Asteroid Velocity

Therefore, Based on the asteroid's velocity, the necessary launch speed (relative to you) is therefore larger than 6 m/s.

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Answer:

balloon is rigid the amount of gas is constant inside the interior pressure of the balloon is constant and in these cities it becomes equal to or slightly higher than atmospheric pressure

Explanation:

Este ejercicio es referente a la mecánica de fluidos, usemos la expresión para la presión  

       P = ρ g h

En es el caso del balón  usemos la presión en la pared extrema, llamemos P la presión por el gas en el interior y P_ext la presión atmosférica del lugar

        cuando se llena el valor en una ciudad de baja altura la presión atmosférica es mas alta

          P_int1 < P_ext1

por lo cual la pared del balón no se mantiene rígida.

Cuando el balón es trasladado a una ciudad con mayor altura sobre el nivel del mar la presión exterior disminuye

       P_ext2 = ρ g h₂ < P_ext1

en promedio la presión disminuye con la altura  en 0,029 atm cada 250 m

por lo tanto como la cantidad de gas es constante en el interior la presión interior del globo es constante y en esta ciudades se hace igual o un poco mayor que la presión atmosférica, en consecuencia la pared del globo esta rígida

        P_int2 >P_ext2

Traslate

This exercise is related to fluid mechanics, let's use the expression for pressure

       P = ρ g h

In the case of the balloon, let's use the pressure on the extreme wall, let's call P the pressure for the gas inside and P_ext the atmospheric pressure of the place

        when the value is filled in a low-lying city the atmospheric pressure is higher

          P_int1 <P_ext1

therefore the wall of the ball does not remain rigid.

When the ball is transferred to a city with higher altitude above sea level, the external pressure decreases

       P_ext2 = ρ g h <P_ext1

on average the pressure decreases with height by 0.029 atm every 250 m

therefore as balloon is rigid the amount of gas is constant inside the interior pressure of the balloon is constant and in these cities it becomes equal to or slightly higher than atmospheric pressure, therefore the wall of the

        Pint 2> Pe

Answer:

In a closed system, the total energy is conserved or remains the same as energy transformations take place.

Explanation:

The law of conservation of energy states that energy cannot be created or destroyed but can be transformed from one form to another.

This law of conservation of energy applies only to a closed system. A closed system is a system which does not exchange energy with its surroundings. All forms of energy conversions occurring within a closed system does not result in an increase or decrease of the total energy of the system, rather, energy remains constant. For example, the universe is a closed system in that all forms of energy conversions occurs within it and energy is not exchanged with an external environment. However, the earth is not a closed system as some of the energy it receives from the sun can be radiated out into space. Since it's an open system, its total energy can change.

The total energy of a closed system as energy conversion takes place

remains constant.

A closed system is the system which doesn't permit any movement of matter

in and out of the system. The closed system doesn't allow the exchange of

energy with its environment.

Since energy exchange isn't permitted in the closed system, the energy

remains constant during energy conversion.

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Answer:

amikah is right.

Explanation:

it will go straight because of newton's first law being that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. basically it left from the bottom of the marble track and will go straight because there isn't a force making it go curved.

Due to the unequal distribution of electrons among the atoms and the asymmetrical shape of the molecule, a water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side).

Water is polar despite having a zero net charge due to the structure of its molecules. The molecule's hydrogen ends are positive, and its oxygen ends are negative. Water molecules are drawn to other polar molecules and to one another as a result.

The oxygen atom draws electrons in the covalent link between oxygen and hydrogen a little bit more strongly than the hydrogen atom.

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To find the spherical convex mirror radius, learn the focal length and magnitude.

What is focal length?

The focal length of a thin lens in air is measured from the lens's center to its primary foci, also known as focal points. The focal length of a converging lens, such as a convex lens, is positive and determines how far a collimated light beam must travel to focus on a single point.

What is magnitude?

Magnitude typically refers to size or distance. By comparing the size and motion speed of the object, we can relate magnitude to movement. The object's or quantity's size determines its magnitude.

R=0.123m

Focal length E= R/2

E= - 0.0615m.

Therefore, the focal length is 0.0615m.

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Answer:

So this is just a ratio/proportion problem

so lets say its in boys:minutes

so in the first scenario

20:8

and we want to find

x:10

So proportion really

20/8=x/10

cross multiply

25

25 boys can sweep it in 10 minutes

The probability that a voltage surge will not damage the television when two surge protectors are arranged in parallel is 99.75%.

The probability that a voltage surge will not damage the television when two surge protectors are arranged in parallel can be calculated using the formula P(A) = 1 - P(A') where P(A) is the probability of an event occurring and P(A') is the probability of an event not occurring.

If we assume that each surge protector has a 95% chance of protecting the television from a voltage surge, then the probability of a surge protector not protecting the television is 5% or 0.05.

Using the formula, the probability that a voltage surge will not damage the television is:

P(A) = 1 - P(A')
P(A) = 1 - (0.05)(0.05)
P(A) = 1 - 0.0025
P(A) = 0.9975

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Answer:

the nearest point.

A satellite in an elliptical orbit around the Earth travels fastest when it is closest to the Earth, at the point called perigee.

In an elliptical orbit, the distance between the satellite and the Earth varies throughout its orbital path. At perigee, the satellite is at its closest distance to the Earth, and due to the conservation of angular momentum, it experiences the highest orbital velocity. As the satellite moves away from perigee and reaches the farthest point called apogee, its velocity decreases.Therefore, the satellite travels fastest at perigee, where it is closest to the Earth.

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Answer:

All the answers are correct.

Explanation:

Comets are cosmic snowballs of frozen gases, rock & dust that orbit sun.

Short period comets take less than 200 years to orbit around sun. Long period comets take more than 200 years to orbit around sun.

Short period comets are said to originate in Kuiper Belt. It is a circumstellar disc made of icy objects, extending from orbit of Neptune. Dwarf Planet Pluto is in this belt.

Answer:

\(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is a zero vector.

Explanation:

An equation is true if and only if adding the same value to both sides of the equation (the value needs to be compatible) gives an equation that is also true.

Start with the \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\).

This equation is true if and only if \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) (\(\vec{B}\) is added to both sides of the original equation.)

Vector addition and subtraction are associative. Therefore, \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) if and only if \(\vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right)\), which is equivalent to \(\vec{A} + 2\, \vec{B} = \vec{A}\).

\(\vec{A} + 2\, \vec{B} = \vec{A}\) if and only if \(\left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A}\) (\(\left(-\vec{A}\right)\)is added to both sides of this equation,) which is equivalent to \(2\, \vec{B} = \vec{0}\).

\(2\, \vec{B} = \vec{0}\) if and only \(\displaystyle \frac{1}{2} \cdot \left(2\, \vec{B}\right) = \frac{1}{2} \cdot \vec{0}\), which is equivalent to \(\vec{B} = \vec{0}\). That is: \(\vec{B}\) is the zero vector.

In other words:

\(\begin{aligned}& \vec{A} + \vec{B} = \vec{A} - \vec{B}\\ &\iff \left( \vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B} \\ &\iff \vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right) \\ & \iff \vec{A} + 2\, \vec{B} = \vec{A} \\ & \iff \left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A} \\ &\iff 2\, \vec{B} = \vec{0} \\ &\iff \frac{1}{2} \cdot 2\,\vec{B} = \frac{1}{2} \cdot \vec{0} \\ &\iff \vec{B} = \vec{0}\end{aligned}\).

Hence, \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is the zero vector.

The power consumed by it when a bulb operated on 110 V is 50 watts. Thus, option B is correct.

Power is defined as the product of current and potential differences in a circuit. Current is defined as the flow of charges when the circuit is connected to the battery. The power in the circuit is Watt (W).

From the given,

potential difference(V) = 220V

Power (P) = 100 W

Current (I)=?

Power =? ( when the bulb has a voltage of 110V)

Power = Voltage×Current

100       = 220×I

100/220 = I

I = 0.454 A.

Thus, the current in the bulb is 0.454A.

Power = Voltage(V) × Current(I)

           = 110×0.454

           = 49.9 W

Thus, the power in the circuit is 50W.

Hence, the ideal solution is option B.

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