which 'energy system' is utilized during very high intensity, shorter exercise, like sprinting a 400 m?

Refreezing the liquid results in the formation of more densely packed upper layers (1/4 air by volume), and eventually, a solid mass of interconnecting ice.

Firn is typically understood to be snow that is least a year old and it has avoided turning into glacier ice during one melt season.The pressure from above causes fluffy snow to pack together and melt in some spots when it is sufficiently deep.

Snow is present.If there is snow on the ground for an extended period of time, the texture, size, and form of the individual grains will change, whether or not the temperature of the snow is below freezing. They may also gradually melt and refreeze before being compacted by consecutive snowfalls.

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a) The angle the sodium vapor light produces its second minimum is at 9.032°

b) The highest-order minimum produced is 12

D sin θ = n λ

D = Slit width

θ = Angle at which minimum is present

n = Order of minimum

λ = Wavelength of light

λ = 589 nm = 589 * 10⁻⁹ m

D = 7.5 μm = 7.5 * 10⁻⁶ m

n = 2

sin θ = n λ / D

sin θ = ( 2 * 589 * 10⁻⁹ ) / ( 7.5 * 10⁻⁶ )

sin θ = 0.157

θ = 9.032°

The highest order minimum is produced when θ = 90°.

n = D sin θ / λ

n = ( 7.5 * 10⁻⁶ sin 90° ) / ( 589 * 10⁻⁹ )

n = 12.7

n ≈ 12

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The distance travelled by the train during the time period of 15 seconds is 156.225 m.

It is given to us that -

The initial velocity of train = 30 km/h

The final velocity of train = 45 km/h

The time taken for this acceleration of train = 15 seconds

We have to find the distance travelled by the train during this time.

Let us assume that -

The initial velocity of train = u

=> u = 30 km/h = [tex]30 * \frac{5}{18} = 8.33 m/s[/tex]   ----- (1)

The final velocity of train = v

=> v = 45 km/h = [tex]45 * \frac{5}{18} = 12.5 m/s[/tex]    ------- (2)

The time taken by the train = t

=> t = 15 seconds    ------- (3)

The acceleration of the train = a

=> [tex]a = \frac{v-u}{t}[/tex]    ------- (4)

The distance travelled by the train = d

=> [tex]d = ut + \frac{1}{2} at^{2}[/tex]    ------ (5)

Now, substituting the values of u from equation (1) and v from equation (2) in equation (4), the acceleration can be calculated as -

[tex]a = \frac{v-u}{t}\\= > a = \frac{12.5-8.33}{15}\\ = > a = \frac{4.17}{15} \\= > a = 0.278 m/s^{2}[/tex]   ----- (6)

Again, substituting the values of u from equation (1), v from equation (2) and a from equation (6) in equation (5), the distance travelled by the train can be calculated as -

[tex]d = ut + \frac{1}{2} at^{2}\\= > d = 8.33*15+\frac{1}{2} *0.278 *15^{2} \\= > d = 124.95 + (0.139*225)\\= > d = 156.225 m[/tex]

Therefore, the distance travelled by the train during the time period of 15 seconds is 156.225 m.

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At least one instance of a negative feedback loop can be found in the growth hormone axis So this claim is True.

Control of thyroid hormone secretion is an important example of a negative feedback loop. Thyroxine and triiodothyronine, also known as "T4 and T3," are thyroid hormones  produced and secreted by the thyroid gland that affect metabolism throughout the body.

The female menstrual cycle is controlled by a negative feedback loop involving the brain. The  hypothalamus of the brain contains glands that secrete gonadotropin-releasing hormone (GnRH). The pituitary gland in the brain produces follicle-stimulating hormone (FSH) under command from GnRH.

The use of negative feedback loops in processes is found in homeostatic systems such as: Thermoregulation (changes in body temperature induce mechanisms that restore normal temperature levels).

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Here is the energy that is left after the quantity of energy is transformed: 750 j of electrical energy is changed into 400 j of kinetic or mechanical energy, which is then turned into 0.32 j of efficient energy.

To run the fan, electrical energy is utilized.

Here, under the specified circumstances, 750 J of electrical energy is utilized to operate the fan, which is transformed into 400 J of kinetic energy. As a result, 350 J of energy is wasted due to various frictional and resistive losses.

Therefore, we may conclude that only 400 J of the 750 J available energy is used to power the fan, with the remaining energy being wasted as a result of friction.

Additionally, we can state that this fan's effectiveness will be

n = Useful ÷ Total

n = 400 ÷ 750

n = 8 ÷ 25

n = 0.32

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The wave's speed is 10 meters per second that oscillates up and down two complete cycles in one second as a 10-meter long water wave passes by.

Step 1: Calculate the distance traveled by the leaf in one second

The leaf oscillates up and down two complete cycles in one second, so it must travel a total distance of 20 meters in one second.

Step 2: Calculate the wave's speed

We can calculate the wave's speed by dividing the distance traveled by the leaf (20 meters) by the time it took for the wave to pass (1 second):

Wave's speed = 20 meters/1 second = 20 meters/second

Therefore, the speed of the wave is 20 meters/second.

Oscillation is a regular, back-and-forth movement between two points. A cycle is a single complete movement from one point to another and back again. When something oscillates up and down two complete cycles, it means it moves up and down between two points twice, completing one full movement in each direction before returning to its starting point.

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Genetic testing and blood typing helped mitigate the effects of blood

reactions and diseases for many people by using  Cytogenetic Testing.

In cytogenetics, the entire chromosome is examined for anomalies. Under a microscope, the chromosomes of a human cell that is dividing can be seen plainly. The easiest cells to obtain for cytogenetic study are white blood cells, particularly T lymphocytes since they can divide quickly in cell culture and may be simply isolated from blood. For cytogenetic analysis, cells can also be cultivated from various tissues, including bone marrow (for leukaemia), amniotic fluid (for prenatal diagnosis), and other tissue biopsies.

Chromosomes are preserved, dispersed on microscope slides, and stained after many days of cell culture. Each of the chromosomes can be recognised separately thanks to the staining techniques used in routine examination. Analysis of chromosomal structure is possible thanks to the unique bands of each chromosome that staining reveals.

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Answer:

The answer would be D. 5 N/kg

The centre of mass's x-coordinates are 1/M(x)dm.

To determine the triangle's centre of mass, we place a strip with a width of dx at a distance of x from the vertex of the triangle. To determine the length of this strip dx, comparable triangles like

Mass of the strip = dm

vertical strips of width = dx

l = x . (a/b)

The mass of the strip is dm=(2M/ab)ldx

The distance of the center of mass from the vertexs of the triangle is

            xCM     = 1/M∫(x)dm

In a uniform gravity field, the "centre of mass" or "centre of gravity" is the distinctive place within an object or system that can be used to characterise how the system responds to external forces and torques. The centre of mass is thought to be the average of all the masses divided by their respective separations. The torques generated are analogous to balancing a seesaw around a pivot in one plane.

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The universe had grown and cooled to the point where electrons could join nuclei to create neutral atoms.

Unknown is the true size of the cosmos. But by measuring the observable cosmos, we may determine that the universe is currently about 95 billion mild years long.

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The heaviest invertebrate is the giant squid, which is estimated to have a weight of about 0.34 tons spread out over its length of 33 feet has the weight of 3332N.

While mass is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is there in a body. The kilogram is the SI unit of mass (kg).A body's mass does not alter at any point in time. only in rare instances where a significant quantity of energy is supplied to or taken away from a body. A nuclear reaction, for instance, results in the mass of the substance being reduced as a very little amount of matter is transformed into a very large amount of energy.

Weight gauges how much gravity is pulling on a body.W = mg is the weight formula. Since weight is a force, it has the same SI unit as a force, which is the Newton (N). When we look at how weight is expressed, we can see that it depends on both mass and the acceleration caused by gravity; while the mass may not vary from one location to another, the acceleration caused by gravity does.

Use the following conversion factors

1 ton = 1000 kg

mass = 0.34 tons = 0.34 x 1000 kg = 340 kg

We know w  = mg = 340 x 9.8 = 3332 N

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Answer:

a = 32^2 / 56 = 2.29 m/s^2.

Explanation:

To find the car's centripetal acceleration, we need to use the formula a = v^2 / r, where a is the centripetal acceleration, v is the speed of the car, and r is the radius of the curve.

In this case, the car's speed is 32 m/s and the radius of the curve is 56 m, so the centripetal acceleration would be a = 32^2 / 56 = 2.29 m/s^2.

It is determined that the lens has 6.7 power.

We are aware that a refracting surface is what a lens is. In light of this, if we have a surface capable of refraction, it follows that such a surface must be a lens.

It is necessary to carefully read the question in order to determine the image distance and the object distance.

Image distance =  30 cm

Object distance =  32 cm

Using;

1/f = 1/v + 1/u

f = focal length

v = image distance

u object distance

1/f = 1/30 + 1/32

f = (0.033 + 0.032)^-1

f = 14.9 cm

Power of the lens = 100/f

= 100/14.9

= 6.7

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Hope it helps.

If you have any query, feel free to ask.

In both prokaryotes and eukaryotes, gene regulation most commonly occurs at the level of transcription initiation.

Many genes in prokaryotes and eukaryotes control their expression during transcription, the pathway's stage when DNA is converted to RNA. Given the high energy costs of transcription and translation (the RNA to protein phase in the cycle), this may make sense.

Structures are shared by bacterial and eukaryotic cells. All cells have DNA, cytoplasm, ribosomes, and plasma membrane. The layer of phospholipids that envelops and shields the cell from its surroundings is known as the plasma membrane, also known as the cell membrane.

Prokaryotic transcription plays a major role in regulating gene expression. Epigenetics, transcription, post-transcription, translation, and post-translation are the levels at which eukaryotic gene expression is regulated.

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Answer:

Resultant vector is a single vector that produces the same effect as is produced by a number of vectors collectively. 

Answer:

Non-metals

a covalent bond is a bond where atoms share electrons

Nonmetals are most likely to form this type of bond

With the use of power formula in dynamics, the magnitude of the opposing force is 3240 N

Power is the rate at which work is done. Power can also be the product of force and velocity. It is measured in Watt.

Given that the engine of a car is developing a power of 90kW when it is moving on a horizontal road at a constant speed of 100kmh.

Power = work / Time

P = F × s/t

P = FV

Where

Convert Km/h to m/s

100/3.6 = 27.77 m/s

Substitute all in the formula

90000 = F × 27.78

F = 90000/27.78

F = 3240 N

Therefore, the total horizontal force opposing the motion of the car is 3240 N

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The two cars will move together immediately after the collision at a speed of = 23 m/s

For solving this question, firstly we need to know the formula for Linear momentum,

⇒ Linear Momentum (p) = mass x velocity

⇒ p = m x v

m = body mass

v = velocity

NOTE- both cars are moving in the same direction

Car 1 weighs 2100 kg and was moving with a velocity of 25 m/s

⇒ Momentum = 2100 x 25

⇒ Momentum = 52500 kg-m/s

Car 2 weighs 1650 kg and was moving with a velocity of 21 m/s

⇒ Momentum = 1650 x 21

⇒ Momentum =  34650 kg-m/s

Total momentum before collision = 52500 + 34650

= 87150 kg-m/s

Momentum after collision = (2100 + 1650)v

= 3750v

By the law of conservation of linear momentum,

⇒ Momentum before collision = Momentum after collision

⇒ 87150 = 3750v

⇒ v = [tex]\frac{87150}{3750}[/tex]

⇒ v = 23 m/s

Therefore, The two cars will move together immediately after the collision at a speed of = 23 m/s

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The amount of heat Q is transferred in this process is -730 kJ, which means the heat is transferred into the surroundings.

Decrement in the energy of the system, ΔU = 250 kJ,

work done on the system, W = 480 kJ,

As we know according to the first law of thermodynamics,

energy can neither be created nor destroyed but can be transformed from one form to another. Further, the first law is given as,  

ΔU = Q - W,

Where

ΔU = change in internal energy of the system,

{Positive if the internal energy increases and negative if the internal energy decreases}

Q = Heat transferred,

{Positive for heat transferred into the system and negative for heat transferred out of the system}

W = work done by the system or work done on the system,

{Negative for work done on the system and Positive when work is done by the system}

Now,

the energy of the system decreases by 250 kJ, so

ΔU = -250 kJ,

And, work is done on the system, so

W = - 480 KJ.

Substituting the value,

ΔU = Q – W

-250 = Q – (-480)

-250= Q + 480

-250 – 480 = Q

K = -780 KJ

Hence, the amount of heat Q is transferred in this process is -730 kJ, which means the heat is transferred into the surroundings.

In thermodynamics, heat is defined as the shape of power crossing the boundary of a thermodynamic gadget through the distinctive features of a temperature difference across the boundary. A thermodynamic device does not contain warmness. nonetheless, the time period is also regularly used to consult the thermal electricity contained in a system as an element of its internal electricity and that is contemplated inside the temperature of the device. For each makes use of the time period, heat is a shape of strength.

Warmth is power in the switch to or from a thermodynamic gadget, by a mechanism that includes the microscopic atomic modes of movement or the corresponding macroscopic properties.

The measurement of strength transferred as heat is referred to as calorimetry, done via measuring its impact on the states of interacting bodies. for example, warmness may be measured by means of the quantity of ice melted, or through trade in the temperature of a frame inside the environment of the machine. Inside the international gadget of units (SI) the unit of dimension for heat, as a shape of electricity, is the joule (J).

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The current changed to produce a 60 v emf in the inductor is 5.0 A/s

ε=−L(di/dt), we may obtain the desired induced emf by setting

(di/dt) = -ε/L = 5.0

An inductor is a passive electronic component that temporarily stores energy in a magnetic field when electric current flows through the inductor's coil.An inductor is defined as a passive component that is used in most electrical circuits to store energy in the form of magnetic energy when electric current flows through it. It is also known as the coil, choke, or reactor. It is a two-terminal electrical component that is characterized by its inductance.

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The weight, drag, and lift are the forces. Actually, lift and drag are two parts of a single aerodynamic force that acts on the ball. Lift acts perpendicular to the motion, while drag occurs in the opposite direction.

What forces are at work when a ball is launched?

Therefore, the drag force, which is essentially air resistance, slows the ball as it moves ahead, the Magnus Force, which curves the ball away from its primary flight path based on its spin, and the gravity force all act on any thrown ball.

How does the gravitational pull affect baseball movement?

The ball moves downhill due to gravity, drag, and the Magnus force. That depends on the pitch, I suppose. The Magnus effect creates a force perpendicular to the motion of the ball in the direction of the spin as it spins in its flight path as pressure fluctuations build on it.

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The acceleration of the baseball is found to be 6000m/s².

(final velocity - starting velocity) / time elapsed = acceleration = a

a = (0-30)/.005 = -6000 m/s2 (negative sign suggests the ball is slowing down) (negative sign means the ball is slowing down)

we know, from the second law of newton, the average force on the ball will be,

Force = F = mass x acceleration = ma

F = (0.145 kg)(6000 m/s2) = 870 N distant from the ball thrower

The amount of the force on the catching player is the same, 870N. The mitt exerts an equal and opposing force on the ball (Newton's Third Law of Motion).

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The new centripetal force becomes one fourth of the original force. Hence, this is the required solution.

A centripetal force is a net force that acts on an object to keep it moving along a circular path.

Centripetal and centrifugal forces are the forces experienced by rotating objects. The centripetal force keeps an object moving in a circle and is always pointed toward the center of that circle. For instance, the gravitational force of the sun is a centripetal force that keeps the Earth orbiting around it.

In the special case of the Earth's circular motion around the Sun or any satellite's circular motion around any celestial body the centripetal force causing the motion is the result of the gravitational attraction between them.

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When a heavy metal block is supported by a cylindrical vertical post of radius r, it exerts a force f on the post. if the diameter of the post is increased to 2r, F force does the block now exert on the post.

A force is an influence that has the power to alter an object's motion. A force can cause an object with mass to accelerate as it increases its velocity, like when it moves away from rest. A simple way to express force is with a push or a pull. A force is a vector quantity since it has both magnitude and direction. It is computed using the SI unit of newton (N). F is the symbol for force. (formerly P). The net force exerted on an object is equal to the rate at which its momentum varies over time, according to the original formulation of Newton's second law. According to this law, if an object's mass remains constant, its acceleration should be inversely proportional to the mass of the item and directly proportional to the net force acting on it. Concepts related to force include thrust, which increases an object's velocity; drag, which decreases an object's velocity; and torque, which alters an object's rotational speed.

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Answer:

Explanation:

The higher the object is relative to some defined baseline (like the ground), the greater the potential energy.

Potential Energy = U = mgh

U is directly proportional to h (height of the object), so the greater the h the greater the U.

The induced current produced due to moving sliding rod having resistance 0.05 is 2.4 A.

Induced current:

Any change in the magnetic field associated with a coil of wire will cause an emf to be induced in the coil. This emf is called induced emf and if the conductor circuit is closed, current will also circulate through the circuit. This current is called induced current.

Given, length of sliding rod, l= 0.1 m

Magnetic field = 0.60T

Velocity = 2m/s

Resistance of the loop = 0.05

Emf Induced = Blv

induced current = Blv/R

[tex]i = \frac{0.6 \times 0.1 \times 2}{0.05} [/tex]

[tex]i = \frac{0.12}{0.05} [/tex]

[tex]i = 2.4[/tex]

so, the current produced in sliding rod moving withspeed of 2m/s in magnetic field 0.6 T and having resistance of loop 0.05, is 2.4 A

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Rutherford’s experiment with gold foil is known as gold foil experiment.

Gold-foil experiment:

Conclusion of Rutherford's model of an atom:

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Noise cancelling headphones works on the principle of destructive interference.

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If igneous rocks are exposed to energy from the Earth's interior and then millions of years later to energy from the Sun then they form metamorphic rocks.

Metamorphic rocks are formed if igneous rock is exposed to the energy of the Sun as well as the Earth's interior for millions of years.

If igneous rock was first exposed to energy from the sun and for millions of years to energy from the Earth's interior then the igneous rock will change into metamorphic rocks because metamorphic rocks are formed when igneous rocks are exposed to intense heat energy and pressure.

The intense heat energy and pressure change the shape and form of the rocks and igneous rock will change into metamorphic rocks.

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Answer:

17.8 m/s

Explanation:

This is a conservation of momentum problem.

Momentum = p = mv

x =  speed of the cannon ball

(200 kg)(0.8 m/s) = (9 kg)(x)

x = (160 kg·m/s) / (9 kg) = 17.8 m/s

A railroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the kinetic energy of the system is "half as much as before". The correct option is (B).

What is kinetic energy?

Kinetic energy, which may be seen in the movement of an object, particle, or group of particles, is the energy of motion.

K.E. = 1/2 m v2

What is difference between kinetic energy and potential energy?

Potential energy is the energy that is held in reserve in a system or object as a result of its position or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate environment.

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