Marina walked 2km in half an hour, what was her average speed during her walk?

The distance from Sun to Earth varies each year due to the difference in orbits. It is due to Tidal stress.

Earth is pulled along in the Sun's orbit around the galaxy. The motion of the sun causes a slight distortion in the planets' orbits as Earth travels around our star. Earth’s orbit is therefore elliptical, or somewhat egg-shaped. The Moon experiences the same effects due to Earth's motion and the Moon's gravitational pull. It is known as tidal stress.

Earth's orbit is slightly elliptical because it is not a perfect circle. And as a result, Earth is either moving from the perihelion point to the aphelion point (constantly getting closer to the Sun) or from the aphelion point to the perihelion point (constantly getting farther from the Sun).

Thus, the above phenomenon can be explained through tidal stress.

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Answer:

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.Explanation:

The mechanical energy at top =Mechanical energy at bottom

\(\\ \tt\longmapsto M_{initial}=M_{Final}\)

\(\\ \tt\longmapsto KE=M_{initial}\)

\(\\ \tt\longmapsto KE=P.E_{(Top)}+K.E_{(Top)}\)

\(\\ \tt\longmapsto K.E=mgh+\dfrac{1}{2}mv^2\)

\(\\ \tt\longmapsto K.E=m\left(gh+\dfrac{v^2}{2}\right)\)

\(\\ \tt\longmapsto K.E=54\left((10)(51)+\dfrac{2.6^2}{2}\right)\)

\(\\ \tt\longmapsto K.E=54\left(510+\dfrac{6.76}{2}\right)\)

\(\\ \tt\longmapsto K .E=54(510+3.38)\)

\(\\ \tt\longmapsto K.E=54(513.38)\)

\(\\ \tt\longmapsto K.E=27722.52J\)

\(\\ \tt\longmapsto K.E=27.7KJ\)

Scientists have observational evidence of black holes through indirect methods, such as studying the effects of their strong gravitational pull on surrounding matter, detecting X-rays emitted from accretion disks.

Black holes, by definition, cannot be observed directly since no light or information can escape their gravitational pull. However, scientists have gathered compelling evidence for their existence through indirect observations. One such method involves studying the effects of black holes on surrounding matter. As matter falls into a black hole's gravitational field, it forms an accretion disk that emits X-rays detectable by space telescopes. Additionally, the detection of gravitational waves, ripples in spacetime caused by the acceleration of massive objects, provides strong evidence for the existence of black holes. Advanced detectors like LIGO and Virgo have successfully observed gravitational waves generated by black hole mergers, confirming their presence in the universe.

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The answer is True. The conservation of charge, or Kirchhoff's current law, stipulates that the total current entering and leaving a junction in an electrical circuit must equal each other.

Kirchhoff's current law asserts that the algebraic sum of currents at any junction point (or node) in an electrical circuit is always zero, often known as the junction rule or the first law. This law is founded on the idea that charge cannot be created or destroyed, which is known as the conservation of charge. Any current that enters a junction must therefore be balanced by an equivalent current that exits the junction. By using current relationships at various nodes, this law serves as the basis for understanding and resolving complex electrical circuits. It is a cornerstone of circuit analysis and is frequently applied in physics and electrical engineering.

The algebraic sum of currents entering every junction point (or node) in an electrical circuit must match the algebraic sum of currents exiting that junction, according to Kirchhoff's current law, sometimes referred to as the junction rule or Kirchhoff's first law. Alternatively said, the total current entering a node equals the total current leaving it. This law is based on the concept of conservation of charge, which holds that electric charge can only be moved from one place to another and cannot be created or destroyed. The entire amount of charge entering a junction must match the total amount of charge exiting that junction since electrons carry charge through a circuit.

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Answer:

the angle of reflection also increases

Explanation:

this is because the law of reflection states that the angle of incidence equals to the angle of reflection, thus, if the angle of incidence increases, angle of reflection should also increase, basically , think as if the angle of incidence is the same thing as the angle of reflection

hope this helps, if not please report it someone else can try it

The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing, called an image. Real and virtual images are the two sorts of images.

The following parameters can be used to describe an image:

1. It is possible for an image to be real or virtual.

2. Left-right reversal is possible or not.

3. The image can be inverted or upright.

4. The image can be enlarged, shrunk, or made the same size as the object.

Plane mirrors provide virtual images that are upright, inverted left-right, the same distance from the mirror as the item, and the same size as the thing.

As a result, the best description of image production by a plane mirror is “a virtual picture is produced behind the mirror.”

The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

Hence, option D is correct.

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Answer:

D the difference between two pressures​

Explanation:

A manometer is a device used to measure the difference between the pressure in a place. Manometer is solely used to determine gas pressure.

In the given scenario, when a body of mass m rests on a horizontal plane with the static and kinetic friction coefficients both equal to y, the maximum force of static friction that can act on the body is equal to y times the normal force.

The static friction coefficient represents the maximum frictional force that can be exerted on an object at rest, while the kinetic friction coefficient represents the frictional force acting on an object in motion. In this case, since the body is at rest, the static friction force is relevant.

The maximum force of static friction can be calculated by multiplying the static friction coefficient (y) by the normal force. The normal force is equal to the weight of the body (m multiplied by the acceleration due to gravity). Therefore, the maximum force of static friction is given by y times the weight of the body.

This maximum force of static friction acts in the opposite direction to the applied force or the force attempting to move the body. As long as the applied force does not exceed the maximum force of static friction, the body will remain at rest. However, if the applied force exceeds this maximum force, the body will start to move and the frictional force will transition to the kinetic friction force.

It is important to note that in this scenario, the static and kinetic friction coefficients are equal (both y). This assumption simplifies the calculations and implies that the magnitude of the frictional force remains constant regardless of the motion of the body.

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Answer:

20 years Light.

Explanation:

There's no practical explanation just math's.

Newton's Law of Cooling is described by the first-order linear differential equation dt/dT = k(T - Ts), where T(t) is the temperature of the object at time t, Ts is the surrounding environmental temperature, and k is the constant of proportionality.

The temperature of an object, governed by Newton's Law of Cooling

(i) To find the temperature of the object as a function of time, we first solve the differential equation dt/dT = k(T - Ts). This is a separable differential equation, and the solution can be obtained by rearranging and integrating:

dt/dT = k(T - Ts)

dt = k(T - Ts) dT

∫ dt = ∫ k(T - Ts) dT

t = k * ∫ (T - Ts) dT

t = k * (T^2/2 - Ts*T) + C

Now, we apply the initial condition T(0) = T0. At t=0, the temperature of the object is T0:

T(0) = T0

k * (\(T0^2\)/2 - Ts*T0) + C = T0

C = T0 - k * (\(T0^2\)/2 - Ts*T0)

C = T0 - k * (\(T0^2\)- 2 * Ts * T0) / 2

C = T0 - k * (\(T0^2\) - 2 * Ts * T0) / 2

So, the equation becomes:

t = k * (\(T^2\)/2 - Ts*T) + (T0 - k * (\(T0^2\)- 2 * Ts * T0) / 2)

(ii) Now, we can find the temperature of the object after 5 minutes (t = 5 minutes). We'll use the initial condition T(0) = T0 and the formula obtained in part (i):

t = 5 minutes = 5/60 hours = 1/12 hours

T(t) = Ts + (T0 - Ts) * exp(-kt)

T(1/12) = Ts + (T0 - Ts) * exp(-k * (1/12))

This equation gives us the temperature of the object after 5 minutes, considering the given initial temperature T0 and the surrounding environmental temperature Ts.

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True. The active elements of fractal computation are indeed the pixels, which are the individual units that make up a digital image.

Fractal computation involves performing complex calculations and iterations on these pixels to generate the intricate patterns and structures that characterize fractals.

True. In the context of fractal computation, the active elements are the pixels, as they represent the individual data points that are calculated and displayed to form the fractal image.

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To reduce the amount of wire, stake the wire halfway between the poles. Therefore, if the anchor point is 10 feet from the first pole, the length of the wire is reduced.

The wire should be fixed 10 feet from the first pole in order to reduce the amount of wire. In the first of these, we calculate the average algorithmic difficulty for the given optimization problem. We demonstrate that this amount does not distinguish different optimization issues, and in this sense, no problem is inherently more difficult than another. Your accessories will have a fantastic grounding placement in any of these places.

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Answer:

One end of any bar magnet will always want to point north if it is freely suspended. This is called the north-seeking pole of the magnet, or simply the north pole. The opposite end is called the south pole.

Explanation:

Answer:

North Pole and South Poles

Explanation:

There is no east or west in a magnetic field of a magnet. The magnetic field lines comes from North pole to south pole.

Answer:

E.  All of the Above

Explanation:

By doing any kind of exercise or physical activity, you are increasing your overall health.  Your muscle strengthen because of the jumping and movement of arms.  You are more alert because you have to time each jump right in order to keep going.  By breathing evenly while jumping, you do help your Cardiorespiratory fitness as well.  And of course, you increase your athletic ablility over all with much endurance and practice.

If you increase the frequency of a sound wave four times, the speed will increase four times. The correct option is A.

Particles that are vibrating make up sound waves. These collide with other particles, causing them to vibrate, which allows the sound to escape the source.

Your ear drums vibrate as a result of air vibrations, which allows you to perceive sound. This vibration is transformed into messages, which proceed to your brain via a nerve.

When sound is produced, air molecules shake and collide, causing vibrations to travel between air molecules. The sound is transmitted by the vibrating particles, which also cause the ear drum to vibrate.

A sound wave's frequency can be increased four times without increasing its speed.

Thus, the correct option is A.

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Answer:

A.A

Explanation:

The balls usually bounce 60% of the original height because it stores 60% of the energy it had before the bounce. When a ball is dropped from a great height it has kinetic energy before it hits the ground which is the result of the bounce of ball. The size of ball does matter in this case, Large balls will bounce higher.

Answer:

B Relesing the string

Explanation:

got it right on edge

Answer:

b .

          :)    :)    :)

Explanation:

Explanation:

the correct answer is Option C, add a cell and close the switch.

hope this helps you.

Answer:

The magnitude of the displacement is  \(H = 14.14 \ km\)

Explanation:

From the question we are told that

  The distance of the car to north is  d =  10 km

   The distance of car to the west is  w =  - 10 \  km

The negative sign is because the direction is  west

Generally applying Pythagoras theorem , the displacement is  

         \(H = \sqrt{d^2 + w^2}\)

=>      \(H = \sqrt{(10)^2 + (-10)^2}\)

=>     \(H = 14.14 \ km\)

Answer:

jus did this, the answer is A, -0.8 m/s^2 :)

Explanation:

The integral in Ampere's law must be evaluated around a closed path, but the path itself can take on many different shapes and orientations.

In using Ampere's law, the integral must be evaluated around a closed path. Ampere's law is a fundamental principle in electromagnetism that relates the magnetic field around a closed loop to the electric current passing through the loop. The integral form of Ampere's law states that the line integral of the magnetic field around a closed loop is equal to the current passing through the loop multiplied by a constant known as the permeability of free space. This law is useful for calculating the magnetic field around various current-carrying structures such as wires, solenoids, and transformers.
The integral around the closed path can be evaluated in any direction, clockwise or counter-clockwise, as long as it follows the right-hand rule for magnetic field direction. The path can be any shape, as long as it is closed and the current passes through the loop. The integral can also be evaluated in multiple segments if the path is not continuous. In summary, the integral in Ampere's law must be evaluated around a closed path, but the path itself can take on many different shapes and orientations.

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Answer:

72.0 + 72.0 whatever you get for that answer

Explanation:

I don't know what else to put

The work done by the force on the particle is 39J and  the angle between F and s is 19.7 degree.

An item with mass is pulled or pushed which alters its velocity. A material that has the ability to change a body's rest or motion state is referred to as an external force. It possesses a magnitude and a direction.

Force F = (Fx, Fy)

Displacement S = (Sx,Sy)

Fx=10N

Fy=-1N

Sx=4m

Sy=1m

F=(10,-1)N and S=(4,1)m

Work done is calculated by taking dot product of force and displacement vector:

W=F·S

W=10×4 + (-1)×1

W=40+(-1)=39J

W = 39 J

To find angle between F and s:

\(|F|=\sqrt{10^2+(-1)^2}\)

|F| = √101

|S| = √(4² + 1²)

|S| = √17

W  = |F| |S| cosθ

39 = √101 √17 cosθ

θ = 19.7.

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If a cube has a mass of 72.9 g and the dimension of the 3 cm side, its density would be

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

As given in the problem Use the data from the following figures to answer the questions below. The cube has a mass of 72.9 g and the cube has a dimension of 3 cm.

The volume of the cube = a³

                                        =3³

                                        =27 cm³

As given the mass of the cube is 72.9 g.

Density = mass/volume

              = 72.9 g/27 cm³

              =2.7 g/cm³

Thus, the density of the cube comes out to be 2.7 g/cm³.

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The question is incomplete the complete question is,

If a cube has a mass of 72.9 g and the dimension of the 3 cm side, What is its density in g/cm3?

Answer:

Fprce is an extranal agency which changes or tends to change the state of rest or uniform motion in a straight line ......

The force with which earth pulls every objects towards its centre is called gravity ..

Answer:

Force is an external agency which changes or tends to change the state of rest or uniform motion in a straight line, the force with which earth pulls every objects towards its center is called gravity

Explanation:

The sound was repeated because of the phenomenon of echo. The speed of sound in the metal is 800 m/s.

Echo results from the reflection of sound waves. The reason why a sound may be heard twice owes to the phenomenon of reflection which leads to echo.

To determine the speed of sound in the metal;

Length of metal = 1000 m

Time taken between the two sounds = 2.5 s

Using the formula;

V = 2d/t

V = 2(1000)/2.5

V = 800 m/s