1.Change the following to scientific notation:
a.)3900000 b.)0.0000024
c.)5800 d.)380
e.)0.0046 f.)50​

Force(F) = 350 N

Work (W)= 0 J

Apply the formula:

Work = Force x Distance

Isolate distance(d)

Distance = Work/ Force

d = W/F = 0 /350 = 0 m

The distance that the object traveled is 0 (zero)

The reflected ray of a ray of light that makes an angle of 25° with the normal to a plane mirror and its is turned through 60°, making the angle of incidence to be 31° is rotated through 12°.

Freflection can be defined as the turning back of a ray of light when its strikes a plane's surface.

There are 2 laws of reflection

(1) The first law of reflection states that the incident ray the reflected ray and the normal all at the point of incidence lie in the same plane

(2) The second law of reflection states that the angle of incident is equal to the angle of reflection.

From the question, if the incidence ray is rotated through 6°, then the  reflected ray is rotated through 12°

Hence, The reflected ray is rotated through 12°.

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The reflection resulting in a 31° angle of incidence and the angle is the reflected ray rotated will be 12°

The law of reflection specifies that upon reflection from a downy surface, the slope of the reflected ray is similar to the slope of the incident ray.

The reflected ray is consistently in the plane determined by the incident ray and perpendicular to the surface at the point of reference of the incident ray.

When the light rays descend on the smooth surface, the angle of reflection is similar to the angle of incidence, also the incident ray, the reflected ray, and the normal to the surface all lie in a similar plane.

As a result, the reflected light is rotated by 12°.

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The light gathering power of a 4-meter telescope is 4 times larger than that of a 2-meter telescope. Therefore, the correct answer is (b) 4 times larger.

The light gathering power of a telescope is directly proportional to the square of the diameter of its aperture. To find the ratio of the light gathering power of the 4-meter telescope to the 2-meter telescope, we can follow these steps:

1. Calculate the square of the aperture diameter for both telescopes:
  For the 4-meter telescope: 4^2 = 16
  For the 2-meter telescope: 2^2 = 4

2. Divide the light gathering power of the 4-meter telescope by that of the 2-meter telescope:
  16 / 4 = 4

So, the light gathering power of a 4-meter telescope is 4 times larger than that of a 2-meter telescope. Therefore, the correct answer is (b) 4 times larger.

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Answer:

a) the factor between the frequencies is      f ’/ f₀ = 9

b) the frequency increases        f ’= 9 f₀

c) So that the frequency is equal to the initial one      k ’= k₀ / 81

d) the torque constant must decrease

Explanation:

This is a simple harmonic motion, like angular velocity

       w = \(\sqrt{\frac{k}{I} }\)

where k is the torsion constant and I the moment of inertia of the flywheel.

Angular velocity and frequency are related

       w = 2π f

we substitute

       \(f= \frac{1}{2\pi } \sqrt{\frac{k}{I} }\)        (1)

We will use the subscript o for the system without change

      f = \(\frac{1}{2\pi }\)  \(\sqrt{\frac{k}{I_{o} } }\)

In the problem they indicate that the torsion constant remains constant, therefore we must analyze the moment of inertia, in general the flywheels are circular discs,

       I = ½ M R²

Let's find the change when reducing the radius r ’= r / 3

Let's use the density

       ρ = m ’/ V’

       m ’= ρ V’

disk volume is

       V = π r² e

suppose that the thickness is small and does not change, substitute

      m ’= ρ π\((\frac{r}{3}) ^{2}\) e = 1/9 m

Moment of inertia

     I ’= ½ m’ r’²

     I ’=\(\frac{1}{2}\) \(\frac{1}{9}\) m (\frac{r}{3}) ^{2} = 1/81 (½ m r²)

     I ’= 1/81 Io

we substitute in equation 1

    f ’= \(\frac{1}{2\pi }\) \sqrt{\frac{k}{I} }

    f ’= \frac{1}{2\pi }   \sqrt{\frac{81k}{Io} }

    f ’= 9 f₀

Let's analyze the questions

a) the factor between the frequencies is

        f ’/ f₀ = 9

b) the frequency increases

        f ’= 9 f₀

c) So that the frequency is equal to the initial one

      k ’= k₀ / 81

d) the torque constant must decrease

Answer:

t = 1.33 seconds

Explanation:

Given that,

The mass of the ball, m = 5 kg

Initial speed, u = 8 m/s

Final speed, v = 12 m/s

Force, F = 15 N

We need to find the time for long the force is applied. Let the time be t. The force is given by :

\(F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{5\times (12-8)}{15}\\\\=1.33\ s\)

So, the force is applied for 1.33 seconds.

Answer:

Caused by gravity and the roller coaster's position, the potential energy is stored in the roller coaster. For example, this ball is at the top of a hill, where potential energy is at it's highest.

Explanation:

Answer:

The main difference between these types of motion is that circular motion is a special case of rotational motion, where the distance between the body’s centre of mass and the axis of rotation remains fixed.

Rotational motion is based around the idea of rotation of a body about its center of mass. In rotational motion, the axis of rotation and centre of mass could change whereas in circular motion, the axis of rotation and centre of mass does not change.

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path and can either have a constant angular rotation rate and constant speed, or it can exist with a changing rate of rotation.

Think of one of those fairground rides where people sit on dummy horses. Now imagine the horses spin around the post that holds them to the base of the ride. Then you have both rotational motion of the horse and circular motion as the horses move around the ride.

When the demand for money parameter, "k," is large, the velocity of money is high, indicating that money circulates rapidly in the economy, and money changes hands more frequently in various economic transactions.

The equation is "m/p = ky," where "m" represents the money supply, "p" denotes the price level, "k" represents the demand for money parameter, and "y" signifies real income or output.

When the demand for money parameter, "k," is large:

- The velocity of money is **high**. Velocity of money refers to the rate at which money circulates in the economy, or the number of times money changes hands in a given period. A larger value of "k" implies that money is being spent more frequently and circulating rapidly in the economy.

- Money is changing hands **more frequently**. A higher value of "k" indicates that individuals and businesses are actively using money for transactions, indicating a faster turnover of money as it changes hands in various economic transactions.

In summary, a large demand for money parameter, "k," suggests a higher velocity of money and more frequent exchanges of money in the economy.

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Answer:

Gravitational force.  Magnetic force.  Electrostatics.  Nuclear force.

Explanation:

Apple falling from a tree

raindrops falling from the sky

I believe Kalpana gave the correct explanation.

The reason is that density is a property of a material that remains the same regardless of the size of the sample. Density is defined as mass divided by volume (density = mass/volume), and it is a characteristic property of a particular type of rock.

Bigger stones will indeed be heavier, but their volume will also increase proportionally, maintaining the same density value. So, the density will be the same for any size of the stone, as long as the type of rock is the same.

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complete question not found in search engine.

Answer:

...............................

If there is increase the magnitude of the induced emf it changes the magnetic field more rapidly. The correct answer is (c).

According to Faraday's law of electromagnetic induction, the magnitude of the induced emf is proportional to the rate of change of magnetic flux through the loop. Magnetic flux is the product of magnetic field and the area of the loop perpendicular to the field.

Therefore, any change that increases the rate of change of magnetic flux will increase the induced emf. Option (c) suggests changing the magnetic field more rapidly, which means that the rate of change of magnetic flux would be higher, leading to a higher induced emf.

Options (a) and (b) are irrelevant because they do not affect the rate of change of magnetic flux. Option (d) would affect the current in the wire but not the induced emf. Hence, option c is correct.

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Answer: you can tell if it stretches or not

Explanation:

elastic stretches and resumes its regular shape

Answer:

If the kinetic energy is the same, then the collision is elastic.

Explanation:

If objects stick together, then a collision is perfectly inelastic. When objects don't stick together, we can figure out the type of collision by finding the initial kinetic energy and comparing it with the final kinetic energy

Answer:

the answer is equal to the microwave gamma rays visible light x-rays.

Answer: it eventually cracks the rock and breaks pieces of the rock off

Explanation:

The frequency the listener will hear is 3.40 kHz. The frequency that the listener will hear can be calculated using the Doppler effect formula, which is given as: f' = f(v + v_l) / (v - v_s)

The frequency of the sound source is given as 1.70 kHz, which is equal to 1700 Hz. The velocity of sound in air is approximately 343 m/s. The velocity of the listener is zero because the listener is stationary. The velocity of the sound source is one-half the speed of sound, which is equal to 0.5 x 343 m/s = 171.5 m/s. Therefore, substituting the values in the Doppler effect formula, we get:

f' = 1700(343 + 0.5 x 343) / (343 - 0.5 x 171.5)
f' = 1700(514.5) / 171.5
f' = 5095.5 / 171.5
f' = 29.70 Hz
The frequency that the listener will hear is 29.70 Hz (rounded to two decimal places).

The Doppler effect is a phenomenon that occurs when a sound source or an observer is in motion relative to each other. It is the change in frequency of a sound wave caused by the relative motion between the source and the observer. The Doppler effect is used in many fields of science and technology, such as astronomy, radar, and medical ultrasound. In astronomy, the Doppler effect is used to measure the velocity of stars and galaxies. In radar, the Doppler effect is used to detect the velocity of moving objects such as aircraft, ships, and vehicles. In medical ultrasound, the Doppler effect is used to measure blood flow velocity and diagnose cardiovascular diseases.

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Answer:

contact force is correct answer

Explanation:

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Answer:

Frictional force

Explanation:

Screws cannot be driven into wood if there was no Fritional force

Answer:

1) The energy released during nuclear fission or fusion, especially when used to generate electricity is called nuclear energy.

2) It is not renewable because it is an element that has no way whatsoever to regenerate or replicate itself, nor gets created by any natural terrestrial means, neither makes itself available by arriving from outer space (like sunlight). There is a limited amount of it available on the Earth, and every bit you use is a bit you’ll never have available again (as Uranium atoms get destroyed by the fission process).

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The rate at which the velocity of an item changes is measured as acceleration.

The change in displacement is measured in terms of velocity. Being merely the rate of change of velocity, acceleration is also a vector quantity. An object's velocity is altered by a net force; the acceleration increases with the magnitude of the net force.

For an item to accelerate by the same amount as an object that is less massive, more net forces are needed. A motion can be accelerated in one of three ways: uniformly, non-uniformly, or averagely. In contrast to velocity, which describes the speed and direction of an object's movement, speed is the rate of movement along a path.

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The period of the storm is 2s

The frequency of the storm is 0.5 Hz

When we talk about the period, what we mean is the time that it would take to complete a cycle. In this case, we have to be looking at the question that we have. We are told that  it takes two seconds for the storm to complete one cycle. This means that the period of the storm is 2s.

The frequency would be the inverse of the period so we can have that;

Frequency = 1/Period

Frequency = 1/2

= 0.5 Hz as shown

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If it takes two seconds for the swing to complete one cycle, the period of the swing is the time it takes to complete one cycle, which in this case is 2 seconds.

To find the frequency of the swing, you need to calculate the number of cycles completed in one second. Frequency is the reciprocal of the period, so to find the frequency, you can use the formula:

Frequency = 1 / Period

In this case:

Frequency = 1 / 2 seconds = 0.5 Hz (Hertz)

So, the period of the swing is 2 seconds, and the frequency of the swing is 0.5 Hz.

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Answer:

F= K q1q2/r^2

K is a constant uqual to= 9 x 10^9 N m^2 C^-2

F= 9 x 10^9 x 2 x 10^-3 x 8 x 10^-5/25

F= 1440/25= 58N

The speed of light relative to its source is light moves at the same speed independent of the motion of the source. Option B.

The Special Theory of Relativity is based on Einstein's discovery that the speed of light does not change as the light source moves. It may seem logical to add the speed of the light source and the speed of the ray to determine the overall speed, but light doesn't work that way.

The speed of light is constant for everything. What Newton, and later Einstein, showed was that there was no underlying frame of reference. All movements are relative. Light differs only in that everyone perceives it at the same relative speed. The speed of light is independent of the movement of the observer. The speed of light does not change with time or place.

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In the northern hemisphere, surface wind blows e. Both (b) and (d) are correct. Surface winds in the northern hemisphere exhibit a counterclockwise and inward flow around an area of low pressure, and a clockwise and outward flow around an area of high pressure. This phenomenon is known as the Coriolis effect, which is caused by the rotation of the Earth.

The Coriolis effect deflects moving air to the right in the northern hemisphere, resulting in counterclockwise circulation around low pressure and clockwise circulation around high pressure.
Temperature inversion occurs in the c. stratosphere and thermosphere.
Temperature inversion refers to a layer of the atmosphere where temperature increases with height, contrary to the typical decrease in temperature with altitude. In the Earth's atmosphere, temperature inversion commonly occurs in the stratosphere and thermosphere. In the stratosphere, temperature increases due to the presence of the ozone layer, which absorbs solar radiation. In the thermosphere, temperature increases significantly due to the absorption of high-energy solar radiation.

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Answer:

everything would die

Explanation:

The Correct Sequence is:

What is the Scientific method?

The scientific method is the approach that scientists use to understand, answer, and explain natural phenomena and events.

The method follows a series of steps that begin with observation, asking questions, conducting background research, and leading to the formation of hypotheses that deny the possibility of explaining the phenomenon to its limits.

Explanation:

Hypotheses are then tested by experiments, and results can be provided to prove or disprove the hypothesis. Results are analyzed and conclusions are drawn based on them. After analyzing the results needs to published and communicated.

Hence, the following is the correct sequence.

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A student writes down several steps of the scientific method , the correct order of steps are discussed below

The proper order is:

1.Make a hypothesis.

2.Conduct an experiment.

3.Analyze the experimental data.

4.Communicate the results.

Experiments are used to test hypotheses, and the results can either support or refute the hypothesis. On the basis of the results, conclusions are drawn. The results must be published and communicated after they have been analyzed.

Therefore, the order that follows is correct.

Scientists use the scientific method to comprehend, respond to, and explain natural phenomena and events. The method involves observing the phenomenon, asking questions, conducting background research, and coming up with hypotheses that deny the possibility of fully explaining it.

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Find the wire tension is true or not.

What is tension?

The force transmitted through a rope, string, or wire when it is pulled by forces acting from opposite sides is referred to as tension. The bodies at each end of the wire are subjected to an equal amount of tension force that is applied along the entire length of the wire.

What is force?

The force that a rope, cord, or other similar object applies to an object is known as the force of tension. Horizontally, two walls are separated by a thin wire. What holds true about the tension T in the wire if a weight W is suspended from it? It is impossible to establish the connection between T and W.

Therefore, it is impossible to establish the connection between T and W.

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Answer:

Explanation:

14

Molecular Orbital Theory (MOT) is a key concept in understanding chemical bonding, and it explains the formation of bonds through the interaction of atomic orbitals. The essential feature of MOT responsible for bond formation is the concept of constructive and destructive interference between the overlapping atomic orbitals.

When two atoms approach each other, their atomic orbitals overlap and combine to form molecular orbitals. These molecular orbitals can be bonding or antibonding, depending on the nature of their interaction. Constructive interference occurs when the wave functions of the atomic orbitals combine in-phase, resulting in a lower energy molecular orbital with electron density concentrated between the nuclei. This increased electron density strengthens the electrostatic attraction between the positively charged nuclei and the negatively charged electrons, forming a stable chemical bond.

On the other hand, destructive interference occurs when the wave functions of the atomic orbitals combine out-of-phase, leading to the formation of a higher energy antibonding molecular orbital. In this case, electron density is reduced between the nuclei, creating a node that weakens the electrostatic attraction and destabilizes the bond. Electrons in antibonding orbitals can counteract the bonding effect of electrons in bonding orbitals.

Bond order, a measure of bond strength, is determined by the difference between the number of electrons in bonding and antibonding orbitals. A positive bond order signifies a stable bond, while a zero or negative bond order indicates that the bond is not formed or is weak.

In summary, the formation of molecular orbitals through constructive and destructive interference between atomic orbitals is the key feature of MOT responsible for bond formation. Bonding orbitals result in stable chemical bonds, while antibonding orbitals can weaken or prevent bonds from forming.

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Answer:

Light is faster in air than in glass so the speed of light decreases when it passes through glass.

Explanation:

Pressure = force / area

P = 400 N / 0.001 m²

P = 400,000 Pa