Undesirable effects of friction and their extended effects. How can you minimize these frictional effects .v​

The final kinetic energy of the skateboarder after she freewheels and did work against friction on the flat section of the path is 4,600 J.

The final kinetic energy of the stakeboarder is determined by applying the principle of conservation of energy as shown below;

ΔK.E = -W

K.Ef - K.Ei = -W

where;

K.Ef = K.Ei - W

K.Ef = 5,000 J - 400 J

K.Ef = 4,600 J

Thus, the final kinetic energy of the skateboarder is 4,600 J.

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Answer:

The answer to this question is given below in this explanation section.

Explanation:

                          "potential displacement"

in geometry and mechanics a displacement is a vector whose length is a shortest distance from the initial to the final position of a point p undergoing motion.it quantifies both the distance and direction of the net or total motion along a straight line from the initial position to the final position of the point trajectory.A displacement may be identified with the translation that maps the initial position to the final position.

A displacement ,may also described as a relative position that is as the final position xf of the point to the point relatively to its initial position xi.The corresponding displacement vectors can be defined as the difference between the final and initial positions.

    s=xf-xi=Δx

in considering motion of objects over time,the instantaneous velocity of the object is the rate of change of the displacement as a function of time.The instantaneous speed then is distinct from velocity or the time rate of change of the position vector.if one considers a moving initial position or equivalently a moving origin.

   From motion over a given interval of time,the displacement divided by the length of the time interval defines the average velocity which is a vector and differ thus from the average speed,which is a scalar.

In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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According to the information available in the question, the force constant is 2.37N/m.

Using the relation;

T = 2π√m/k

T = period = 0.500 s

m = mass in kilograms = 0.0150-kg

k = spring constant = ?

Making k the subject of the formula;

k = 4π^2m/T^2

k = 4 × (3.142)^2 ×  0.0150/(0.500 )^2

k = 2.37N/m

What is force?

A mass object's velocity changes when it is pushed or pulled. Its SI unit is Newton and its base SI unit is \(kgm/s^{2}\). A device, spring balance is used to measure force.

There are two effects of force, it changes the speed and the direction.

How much force is 1 newton?

1 newton is the amount of force, is the force required to accelerate a mass of 1 kg at 1 m per second with respect to time.

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Answer:

I think it would be 0.1496 but I'm not really sure sorry

According to the problem the speed of the electrons is 2.7 * 10^7 m/s.

Electrons are the smallest particles of matter and are part of an atom. They carry a negative charge and are found in the nucleus of an atom, orbiting around the nucleus in shells or energy levels. Electrons are important for chemical bonding, as they are the particles that form when atoms bond together. They also play a role in the transfer of energy, as they can move from one atom to another.

The speed of the electrons in the beam can be calculated using the equation v = √(2*E/m),
where E is the energy of the electrons (given by E = qV,
where q is the charge of the electron and V is the potential difference) and m is the mass of the electron.

Using the given values, we get v = √(2 * 1.6 * 10^-19 * 30 * 10^3 / 9.1 * 10^-31) = 2.7 * 10^7 m/s.

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Answer:The disturbance created by a source of sound in the medium travels through the medium and not the particles of the medium

Explanation:i hope this is right

Answer:

I'm pretty sure its 1080

Explanation:

force is = to mass multiplied by acceleration.

So 900 kg multiplied by 1.2m/s is = to 1080

I'm no expert so please tell me if I'm wrong so that I can improve.

Have fun buddy .

Answer:

It will absorb yellow and reflect green

Two point charges, A and B, lie along a line separated by a distance L.

\(A\)\(---------x---------\)\(B\)

The point x is the midpoint of their separation. The combination of charges would yield the greatest repulsive force between the charges are \(-4q ,+4q\).

As the electric field is defined as the force per unit charge, it is also a vector,  which acts along the straight line joining the point with the charge that produces the field, same as if there were a charge in this point.

By definition, the direction of the electric field, would be the one that would take a positive test charge (small enough not to change the charge distribution that produces the field), placed in the point where we can find the field value, so it will be away of the charge if the charge creating the field is positive and vice versa if the charge is negative.

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The statement its acceleration is positive from 0 seconds to 60 seconds about the object represented in the graph is TRUE (Option B).

Positive acceleration occurs when an object increases its velocity or speed in a measurement that includes not only velocity as vector but also direction (the same sense) in order to produce a movement as a positive value.

Therefore, with this data, we can see that positive acceleration refers to the increase of velocity in a given unit of time having the same direction during this process.

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Answer:

A particle that has the same charge as lambda baryon is a neutron.

Explanation:

A lambda baryon is a subatomic particle that is made up of three quarks - uds (up, down and strange). It contains the same number of protons and neutrons, and an isotopic spin of 1. It is a family of hadrons just like mesons.

A quark is a fundamental or basic particle that make up a matter. It can combine with two or more to form composite particles (e.g neutron or proton). These basic particles are held by a very strong attractive force. The composite particles are the constituents of the nucleus of an atom.

The particle that has the same electric charge as the lambda baryon is neutron.

The lambda is known to be a baryon that  is composed of three quarks. They are:

The neutron is known to be a kind of subatomic particle that is often written as n or n⁰ . It is known to have a neutral charge and its composition is that of 1 up quark and 2 down quarks.

See full question below

The lambda baryon has the quark composition uds. Which particle has the same electric charge as the lambda baryon?

1. neutron

2 electron

3. proton

4 antimuon

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The light travels through water and gets reflected off on the glass surface into the water. There had been a 180° phase change between the incident and the reflected wave. This is called Total internal reflection.

In total internal reflection, in physics, a ray of light in a medium such as water or glass is completely reflected back into the medium from the surrounding surfaces. This phenomenon occurs when the angle of incidence is greater than a certain critical angle called the critical angle. TIR only occurs when both of the following two conditions are met Light is in a denser medium and is approaching a less dense medium. The angle of incidence should be greater than the so-called critical angle.

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Answer:

15 V

Explanation:

From the question,

For series connection: (i) Both resistor have a common current flowing through the (ii) The combined resistance = R1+R2

Rt = R1+R2.................. Equation 1

Given: R1 = 5 ohms, R2 = 7.5 ohms.

Rt = 5+7.5 = 12.5 ohms.

Applying Ohm's law,

V = IRt................... Equation 2

Where V = Voltage, I = current.

make I The subject of the equation

I = V/Rt.............. Equation 3

Given: V = 25 V, Rt = 12.5 ohms.

Substitute into equation 3

I = 25/12.5

I = 2 A.

Now,

Voltage drop across the 7.5 ohms resistor = R2×I

Voltage drop across the 7.5 ohms resistor = 7.5×2

Voltage drop across the 7.5 ohms resistor = 15 V

The number of  atoms of chromium in the sample is 1.2 x 10²⁴ atoms.

The number of atoms of chromium in the sample is calculated by applying the following method.

The given compound;

= K₂Cr₂O₇

The atoms of oxygen in the sample = 4.2 x 10²⁴

Based on the principle of simple multiple ratio or law of simple proportions, the number of f atoms of chromium in the sample is calculated  as;

Cr = 2 molecules

O = 7 molecules

7 = 4.2 x 10²⁴ atoms

2 = ?

= (2 x 4.2 x 10²⁴ ) / 7

= 1.2 x 10²⁴ atoms

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Answer:

The answer is C. Series.

Answer:  

2

Explanation:

Active galactic nuclei (AGN) are some of the most powerful sources of energy in the universe. They are believed to be powered by the accretion of matter onto supermassive black holes at the centers of galaxies. Seyfert galaxies are a type of AGN that emit strong radiation in the optical and X-ray parts of the spectrum.

The energy source for Seyfert nuclei is believed to be compact due to the extreme conditions near the black hole. As matter falls towards the black hole, it is heated and compressed, releasing vast amounts of energy. This energy is then radiated away in the form of X-rays and other high-energy photons. The compact nature of the energy source allows for efficient radiation and high luminosity, making Seyfert nuclei some of the most powerful and intriguing objects in the universe.
The energy source for active nuclei like Seyferts is thought to be compact because the immense energy emitted from these galactic centers is concentrated within a relatively small region. This suggests that the energy-producing mechanism involves the accretion of matter onto a supermassive black hole, which causes the surrounding material to heat up and emit radiation. The compact nature of the energy source allows for the rapid variability observed in the luminosity of Seyferts, as changes in the accretion process can quickly affect the energy output. This compact energy source, combined with the presence of high-energy particles and the interaction of the nuclei with their environment, leads to the unique characteristics of Seyfert galaxies.

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Answer:

Endurance exercise and Strength exercise

Explanation:

Answer:

Aerob exercise and strength exercise

Explanation:

The force per unit area exerted by an electromagnetic wave is called : the intensity of the wave.

The intensity represents the energy flow per unit time through a unit area perpendicular to the direction of wave propagation. It is a measure of the power carried by the wave per unit area.

The intensity of an electromagnetic wave is directly proportional to the square of the amplitude of the wave. As the wave travels through space, the intensity decreases with distance due to spreading and dispersion of energy over a larger area.

The intensity of electromagnetic waves, such as light, is commonly expressed in units of watts per square meter (W/m²) or in decibels relative to a reference intensity level (dB). It is an important parameter in various fields, including optics, telecommunications, and radiation studies, as it determines the amount of energy transferred by the wave and its potential effects on materials and systems.

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The unit vectors along the three co-ordinate axes are described as. i > j > k > 1. is D. i = j = k = 1

A vector that has a volume of 1 is a unit vector. It is also known as a direction vector because it is generally used to denote the direction of a vector. The vectors i, j, k, stand the unit vectors along the x-axis, y-axis, and z-axis respectively.

There are three essential unit vectors which are commonly employed and these are the vectors in the direction of the x, y and z-axes. The unit vector in the direction of the x-axis is i, the unit vector in the direction of the y-axis is j and the unit vector in the demand of the z-axis is k.

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The frequency of 400 Hz is not possible.

Given that:

Frequency = 200 Hz

Length = l

Let's suppose, the given frequencies are,

600 Hz, 1000 Hz, 1400 Hz, 1800 Hz, and 400 Hz respectively.

To determine the possible resonance frequencies, we need to calculate the fundamental frequency.

Now using the formula of fundamental frequency for pipe

Where, n = odd number

F = nv / 4L

To calculate the first overtone, use the above formula.

n = 3

F = nv/4L = 3 x v / 4L = 3 x 200 = 600 Hz

For the second overtone, Use the same formula.

n = 5,

F = nv / 4L = 5 x 200 = 1000 Hz

For the third overtone, use the formula

n = 7,

F = nv / 4L = 7 x 200 = 1400 Hz

For the fourth overtone, use the formula.

n = 9,

F = nv/ 4L = 9 x 200 = 1800Hz

Hence, The frequency of 400 Hz is not possible.

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Answer:

27\(cm^{3}\)

Explanation:

The formula to find the volume of a cube is Volume=height cubed(or to the power of 3) so you would replace height with 3cm and get the equation Volume= 3 to the power of 3. So 3 x 3 x 3 = 27. So your answer would be:

27\(cm^{3}\)

the characteristics of the a 10 L ideal gas vessel filled with it at a pressure of 10 atm and temperature of 300 K. any desired changes in the vessel's volume or pressure. 30L of liquid will be produced at constant pressure when the temperature is 200 k.

That amount of force delivered perpendicularly to an object's surface in relation to its area is known as pressure. Pressure is a force-area relationship; pressure = force area. Pascal is the SI pressure measurement (pa).

The formula for calculating pressure is P = F / A, or force for unit of the surface area. The SI unit in measuring pressure is the pascal, and the sign for pressure in physical science is p. (symbol: Pa). One Newton per sq.m of force exerted perpendicularly on a surface is equal to one pascal.

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Answer:

a wedge.

Explanation:

it moves when you apply force to one end of the wedge.

Explanation:

Given parameters:-

To find:-

Solution:-

Here , we are provided frequency of electromagnetic wave and we have to find the wavelength of the wave. To find the wavelength we have to divide the speed of light by given frequency. therefore,

\(\tt\red{wavelength( \lambda)= \frac{speed(c)}{frequency(f)}}\)

\( \rightarrow \sf \: \lambda = \frac{3 \times {10}^{8} }{8.2 \times {10}^{14} } \\ \\ \rightarrow \sf \: \lambda = \frac{3 \times {10}^{8} \times {10}^{ - 14} }{8.2} \\ \\ \rightarrow \sf \: \lambda = 0.36 \times {10}^{6} \\ \\ \rightarrow \sf \: \lambda = 36 \times {10}^{4}m\)

Answer:

are crashing?

hope it's good hahah.

The correct answer is: "vibrate".

To find the correct word to complete the sentence, we need to know more about the sound wave.

What is sound wave?

How does sound wave produce?

Thus, we can conclude that sounds are made when objects vibrate in air.

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Answer:

As indicated by Newton's law of attraction each article or body in the universe draws in every single item towards one another and that power of fascination is straightforwardly relative to the result of their masses and contrarily corresponding to the square of the distance between them.  

The power of gravity between two articles will diminish as the distance between them increments. The two most significant elements influencing the gravitational power between two items are their mass and the distance between their focuses. As mass increments, so does the power of gravity, however an increment in distance mirrors a reverse proportionality, which makes that power decline dramatically.  

At that point by Newton's All inclusive Law of Attractive energy;  

F=GMm/R^2  

Mm= result of the majority  

R=Distance Between the two masses by focus.  

On the off chance that R is multiplied, new force=GMm/(2R)^2  

=GMm/4R^2  

Unique Power/New Force=4/1  

F/4=New Power

Answer:

atoms and molecules

Explanation:

as opposed to being continuous or just including particles). On the following page, the idea is stated as one of four concepts in Dalton's theory: “All matter is composed of tiny, indivisible particles called atoms”

Answer: atoms

Matter is made of atoms, the basic building blocks. Atoms are made of protons, neutrons and electrons. The answer is atoms.

Hope it helps!

Answer:

There are several ways to consider the composition of the human body, including the elements, type of molecule, or type of cells. Most of the human body is made up of water and H2O, with bone cells being comprised of 31% water and the lungs 83%.1  Therefore, it isn't surprising that most of the human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 96.2% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen, and nitrogen.

Explanation:

Elements are essential units that are the basic constituents of all living and non-living beings. They are the core of the universe. Every tiny or huge particle comprises elements. Our body is built up of five major elements: Carbon, Hydrogen, Oxygen, Nitrogen and calcium.