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Kinetic friction is a force that resists the motion of an object moving along a surface whenever two objects' surfaces are in contact with one another.

Sliding friction: What is it? Sliding friction is the resistance that any two items produce as they slide against one another. This friction, sometimes referred to as kinetic friction, is the force required to keep one surface moving along another.

Sliding friction, also known as kinetic friction, is a contacting force that opposes the movement of two objects sliding against one another or between an entity and a surface.

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A simple compound microscope provides large magnification by employing a short focal length objective and a short focal length eyepiece.

A compound microscope is a high magnification microscope that uses two lenses to compound the level of magnification. The first lens is an objective lens and the second lens is an eyepiece lens.

In compound microscope both lenses are convex lenses. The objective lens has a very short focal length and hence has very high magnifying power (P ∝ 1/f ).

The image formed by the objective lens serves as the object to the eyepiece. The position of the eyepiece is kept such that the image formed by the objective lens is formed within the focal length of the eyepiece.

So, the focal length is short for eyepiece lens also.

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the internal enclosure wall is 539 K degrees in temperature. If a container has a 50 m2 interior space, the interior surface is black, and the container is kept at a constant temperature,

The answer solely depends on how well-insulated your house is. If your property is very well insulated, it is best to leave the heating on at a preset temperature, where thermostat and boiler can easily maintain the temperature because there is little heat loss.

Ohm's law states that temperature will remain constant, hence [heat] = vIt, where t is a constant. Since v and I are directly proportional, increasing v will likewise increase I, increasing v will result in an increase in heat (temperature).

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The water based transport is called a ship when it weighs more than 500 tonnes.

The differences between boat and ship are stated for detailed clarification on the two-

Concerning size, ship is larger than a boat. It can be understood from the fact that boat can be shipped in a ship but ship can not be transported in a boat.

Boats are used in small areas and smaller purposes. Ships are used in seas and oceans for cargo and passenger transport.

Subsequently, based on large size and large medium of transport, the crew members in shop are more than boat. They include engineers, navigators, technicians and other important individuals.

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The 4 reasons why tariff are imposed are:

What is a Tariff?

A tariff is a type of tax levied on imported goods or services. Tariffs are a common element of international trade The main reasons for imposing tariffs include reducing imports of goods and services by raising prices and protecting domestic producers.

Customs duties usually take one of two forms: specific or ad valorem. A specific tariff is charged on a per-item basis (for example, a tariff of $1,000 per imported vehicle). An ad valorem tax is a duty charged as a percentage of the value of goods (eg 10% of the value of an imported car).

The 4 reasons why tariff are imposed are:

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When it reaches a velocity of 32 m/s, it is 571.2m high above the ground.

What does velocity refer to?

Velocity is the direction speed of an item in motion as a measure of the rate at which its location is changing as seen from a certain point of view and as measured by a specific unit of time.

The movement of an object that has been launched into the air is known as projectile motion. Only gravity is felt by the item after the initial force that launches it. Projectile and trajectory both refer to the same thing: an object.

Given

Initial velocity ,u =  84m/s

Final velocity, v =  32m/s

Gravity ,g = -10m/s (upward motion, against gravity )

We know, v = u + gt

32 = 84 -10t

10t  = 84-32

t = 5.2 s

Now using, s = ut +1/2 gt^2

s = [84*5.2] +1/2[10*5.2^2]

s = 436 + 135.2

s = 571.2m

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Yes, Ballistic stretching can be harmful if it is not performed properly.

This type of stretching involves bouncing movements, which can place excessive strain on the muscles and connective tissues. This can lead to muscle strains or tears, as well as other injuries. It is important to use caution when performing ballistic stretches and to stop if any pain or discomfort is experienced. It is also recommended to warm up before stretching and to stretch slowly and smoothly, rather than using ballistic movements.

Ballistic stretching can also increase the risk of muscle imbalances and poor posture if it is not balanced with other types of stretching, such as static stretching. It is generally more effective and safer to gradually increase flexibility through regular, consistent stretching rather than trying to force the body to stretch too quickly or aggressively.

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A ball is attached to a string that is whirled around in a horizontal circle having the radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is one-half the original speed.

The formula for the centripetal force is

                 F = mv² / r

where F is the centripetal force

          m is the mass of the ball

          v is the velocity of the ball

          r is the radius of the circular movement

Let us rearrange the equation,

               [tex]\displaystyle v = \sqrt{\frac{Fr}{m}[/tex]

If the radius of the circular movement is reduced as r/4, then the velocity becomes,

               [tex]\displaystyle v = \sqrt{\frac{Fr}{4m}[/tex]

              [tex]\displaystyle v = \frac{1}{2} \sqrt{\frac{Fr}{m}[/tex]

which means that if the radius is reduced by one of forth the original, then the velocity will be reduced by twice the original.

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The complete question is

A ball attached to a string is whirled around in a horizontal circle having a radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is which of the following?

 (A) One-quarter the original speed

 (B) One-half the original speed  

(C) The same as the original speed

(D) Twice the original speed

(E) Four times the original speed

Due to the uniform distribution of leaves, folivores rarely exhibit dominance hierarchies.

A dominance hierarchy is a type of social hierarchy that arises when members of a social group interact, to create a ranking system. In social living groups, members are likely to compete for access to limited resources and mating opportunities. Rather than fighting each time they meet, relative rank is established between members of the same se x. Based on repetitive interactions a social order is created that is subject to change each time a dominant animal is challenged by a subordinate one. This hierarchical structure can be observed in many species, including humans.

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a word portion that is added to a root word to alter or modify its meaning; prefixes and suffixes are also considered affixes. combining vowel, word root, suffix, prefix, and suffix.

A root word is a word that has no prefixes or suffixes (a prefix is a string of letters that go at the start of a word; a suffix is a string of letters that go at the end of a word). We can alter the meaning of a root word by adding prefixes and suffixes. For instance, the suffixly is added to the word love to create the word beautiful. While a root can serve as the foundation for a new term, it rarely does so.

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The S.I unit of wavelength is metre. The wavelength is the separation between two crests or troughs that occur back-to-back.

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The speed at which the satellite travels is 7.7 kilometers per second.

To calculate the speed at which the satellite travels, we can use the equation

where v is the velocity of the satellite, G is the gravitational constant, M is the mass of the Earth, and r is the radius of the satellite's orbit.

The period of the satellite's orbit, which is the time it takes to complete one orbit, can also be used to calculate the speed of the satellite using the equation

where T is the period of the orbit. Solving for v in this equation, we can find that the speed of the satellite is 7.7 kilometers per second.

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For what-if analysis, Microsoft Excel add-in program Solver is helpful.

Excel Solver allows up to 200 variable cells to be specified. We have a few cells in this example whose values can be modified: projected clients per month (B4), which need to be no more than 50; and Calculate the cost per service (B5) using Excel Solver.

Although it is not a cure-all, the evolutionary technique enables you to spend less time examining the mathematical aspects of your model while still obtaining "excellent" solutions.

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Reason-1. Blower Motor and Resistor: This particular part is responsible for taking the heated air from your coolant system and pushing it through your hot heater core. From here the air will pass through your ventilation system and enter the cabin.

2. Incorrect Coolant Level: all you need to do to fix this is to add more coolant. Fill it up to the appropriate level, and you’re good to go. Take your heating system for a test drive. If the problem persists, you need to check through some of our other options. If the problem no longer persists, you’re good to go.

3.  Thermostat: Our third common reason for a heater not working is a broken thermostat. Your heater core, and sometimes even your radiator, is designed to work in accordance with a thermostat

4. Hoses: As we mentioned earlier, if your coolant system is not working correctly, your heater core won’t either. So, if you have a damaged component in your coolant system, like a hose, odds are nothing’s going to work right.

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Q=ne will be the formula used to determine the number of electrons. More details The quantity of energy or electrons that are transferred from one body to another by a variety of modes, such as conduction, induction, etc., is known as an electric charge.

A negatively charged subatomic particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons. The nucleus of an atom is made up of electrons, protons, and neutrons together.

By exchanging electrons to form chemical bonds, atoms join together to form molecules and compounds. Knowing the number of electrons attached to each atom is the first step in comprehending the nature of this bonding. You may determine the amount of electrons in a substance based on its chemical formula using information from a periodic chart of the elements and some simple math.

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Calcium is released by the action of osteoclasts which break down bone matrix.

The cells known as osteoclasts are responsible for breaking down bone to start the process of normal bone remodeling and for mediating bone loss in pathologic situations by escalating their resorptive activity. They develop in the bone marrow from progenitors in the myeloid/monocyte lineage, which then circulate in the blood. The Howship lacunae, which osteoclasts occupy on the surface of the bone, are assumed to be the result of the osteoclasts' enzymes eroding the bone. The union of many cells produced from blood-circulating monocytes results in osteoclasts. These are derived from the bone marrow in turn.

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Answer:

Total energy (E) =me=m(u+ke+pe)=U+KE+PE

The frequency would have units of cycles/second, waves/second or vibrations/second.

Frequency, in physics, is the number of waves that pass fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

What is frequency?

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The gravitational force exerted on the moon while it is in orbit around the planet is 1 × 10¹⁹ N.

Gravitational Field Strength is defined as the gravitational force per unit mass experienced by a point mass at a certain point.  It is  a vector quantity having SI unit Newton/kg.

Mass of the moon: M = 1 ×10²² kg.

The gravitational field strength at a distance r from the planet is: E= 0.001 N/kg.

Hence, gravitational force acting on the moon: F = mE

= 1 ×10²² × 0.001 N

= 1 × 10¹⁹ N.

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Lenz's law is related with the sign of the induced emf or voltage in a coil and states that the induced voltage always appear in such a direction as to oppose the cause of its production, that is, rate of change of emf.

According to Lenz's law, which deals with the sign of the induced emf or voltage in a coil, the induced voltage always manifests in a way that is opposite to the emf change rate that led to its induction.

Now, as the north pole of the magnet draws nearer to the coil, the magnetic flux connected to the coil increases, causing the induced voltage to be negative, causing that face of the coil to function as the north pole, repelling the approaching north pole (opposes the increase of magnetic flux). Likewise, the induced voltage's sign changes to positive as the S pole of the magnet moves away from the coil, causing that face of the coil to behave as described.

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Saturn planet has an orbital eccentricity most like the orbital eccentricity of the Moon.

An ellipse's eccentricity (e) is a value that affects how it looks, such as whether it is more rounded or if it resembles a segment. Let "a" be the major semi-axis and "c" be the focal semi-distance:

e = c / a

The gravitational forces that propel the planets disappear as they gracefully glide into an orbit around the Sun. However, a planet must follow an orbit to stay inside the bounds of the gravitational pull of other celestial bodies, particularly the sun.

The orbits have an ascending node, a vernal point, an argument of the perihelion, an eccentricity, an inclination, and an aphelion. The planets' orbits are all roughly on the same plane. The ecliptic is the name of this orbital plane.

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The formula for calculating lambda is: Lambda = (E1 – E2) / E1.

Lambda is the symbol for wavelength it isn't a constant there for no standard value

it is linked to frequency:

frequency x Wavelength = speed of light (3x10^8)

What is lambda?

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The slope of a line is a measure of the steepness of its angle with the x-axis. A line parallel to the x-axis has no angle and therefore has a slope of 0.

The slope of a line is a measure of the steepness of its angle with the x-axis. It is calculated by taking the ratio of the change in y-coordinates to the change in x-coordinates (rise over run). A line parallel to the x-axis has no angle and therefore has no rise or run. This means that the change in y-coordinates over the change in x-coordinates is 0, resulting in a slope of 0. This is true for any line parallel to the x-axis, regardless of its length or orientation. A line perpendicular to the x-axis will have a slope of either positive or negative infinity, depending on its orientation. A line that is neither parallel nor perpendicular to the x-axis will have a slope greater than 0 but less than infinity, depending on its angle with the x-axis.

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Sonar, or underwater sound projectors, were originally utilised during World War I and were the first modern innovation in seafloor mapping.

Who was the first to map the ocean floor?

Sonar was being used to map deep water areas by the Coast and Geodetic Survey, which was the forerunner of NOAA's Ocean Service, by the 1920s.

Marie Tharp , who was born in Michigan in 1920, worked as both a geologist and a cartographer. Tharp was the first to map the ocean floor scientifically in collaboration with her coworker Bruce Heezen. In the 1940s, Tharp started her career in science as a geologist for Stanolind Oil. 

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The question is incomplete I can answered it in general way .

The equivalent emf of the collection will be 15.6 V. A conventional (i.e., non-quantum) field created by moving electric charges is known as an electromagnetic field (sometimes referred to as an EM field or EMF). It is the field that is described by classical electrodynamics (a classical field theory), and it is the classical analogue of the quantum electrodynamics' quantized electromagnetic field tensor (a quantum field theory).

The collection's equivalent emf can be obtained as shown below. The results of the investigation were as follows:

Emf 1 (E₁) = 3.0 V

Emf 2 (E₂) = 4.5 V

Emf 3 (E₃) = 1.5 V

Emf 4 (E₄) = 2.0 V

Emf 5 (E₅) = B₁ = 4.6 V

Equivalent emf (E) = ?

E = E₁ + E₂ + E₃ + E₄ + E₅

E = 3 + 4.5 + 1.5 + 2 + 4.6

E = 15.6 V

Therefore, the equivalent emf would be 15.6 V.

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The match description of these stars with their life cycle stage are as follows:

Stars follow the same 7-stage cycle in their lives. The life cycle is as follows:

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A spring of force constant 120 N/m acted up by a constant force of 240N. Then, the elastic potential energy stored in the spring is 240 Nm.

The elastic potential energy stored in the spring is formulated as follows

                                                 PE = ½kx²

Where PE is the elastic potential energy, x is the displacement of the spring from its equilibrium position, and k is the spring force constant.

In this question, the spring force constant is 120 N/m, and the constant force acting on the spring is 240 N. To find the spring displacement, we can use the formula:

F = kx

Where F is the force acting on the spring, x is the displacement, and k is the force constant,

So that:

F = kx

240 N = 120 N/m . x

x = 240 N/120 N/m

x = 2 m

Once x is known, then we can calculate the potential energy of the spring:

PE = ½kx²

PE = ½ (120) (2²)

PE = 60 x 40

PE = 240 Nm

So, the elastic potential energy stored in the spring is 240 Nm.

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This cart's speed at point 2 is indicated as √5GR

How fast is it?

This is how far something moves over a predefined or fixed length of time. Although it is the fastest, the for loop is difficult to read. The for each is quick, and iteration may be managed.

gravitational speed, or g.

m = the cart's mass

r = radius

1 speed equals v1.

f1 is  centripetal force

f1 = mv1²/R

m1 = mg

mv1²/R = mg

the cross-multiply v1² = gr

v1 = √gr

H = 2R

mgH x mv12/2 mv22/2

2GH + v1² = v2²

2g(2R) + (√gR)² = v2²

4gr + GR = V2²

5GR = v2²

√5GR = v2

As a result, at point 2, the cart's speed is indicated as √5GR

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Answer:

Hence, the isotope will take about 6.645T years to reduce to 1% of its original value

Explanation:

4.08 seconds thank me later