please help and explain

Using the theories of fulcrum ,we got that it is true that while doing pushups, the toes are the point around which rotation occurs. thus, they form the fulcrum of the lever.

A fulcrum is the stationary point of a lever while a lever arms connect the fulcrum to the points on the lever arms that are actually vertically aligned with the centers of mass

Hence, while doing pushups, the toes are the point around which rotation occurs. thus, they form the fulcrum of the lever is true.

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(Complete question) is:

while doing pushups, the toes are the point around which rotation occurs. thus, they form the fulcrum of the lever, Select true : false.

The combined mass of the cessna plane and the passangers, with a potential energy of 800 J is 0.041 kg.

Mass can be defined as the quantity of matter a body contains.

To calculate the combined mass of the cessna plane and passangers, we use the formula below

Formula:

Where:

Make M the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the combined mass of the cessna plane and the passangers is 0.041 kg.

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Activity 1 and Activity 3 both needed extra work than Activity 2, while Activity 3 did not.

When an object is displaced over a distance by such an external force, at least a portion of that force must be supplied in the directions of a displacement. This is known as work in physics. The quantity of force required to move a thing a specific distance is referred to as the work done.

Three categories can be used to classify the type of labor performed. Positive work, negative work, and zero work are the three types. The angle among force and displacement determines the kind of work that is done. Positive work occurs when a force is applied and an object is moved in that direction.

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When the crests of two waves overlap, constructive interference takes place. The crests of the waves combine as they pass through one another to create a wave with a larger amplitude. When two troughs come into contact, the same thing may happen.

A phenomenon known as interference occurs when two waves merge by adding their displacements at each and every point in space and time to create a new wave that may have a larger, smaller, or same amplitude. The amplitudes are progressive if one of the waves' crests coincides with another wave's crest. The resultant amplitude would double if the two waves' amplitudes were equal. Remember that the square of the amplitude determines how much light there is in an area. Constructive interference happens where the lines—which represent the peaks—cross one another. In other words, when two waves are in phase, constructive interference happens. Destructive interference results when two waves are completely out of phase (a peak is situated in the middle of two waves).

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The focal length of the lens is 100 cm.

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Because it spirals inward, it slowly decreases its orbital radius. So so long as a satellite acts in a round orbit, it's velocity is inversely proportionate.

A satellite or synthetic satellite tv for pc is an object deliberately positioned into orbit in outer area. besides for passive satellites, most satellites have an energy technology system for device on board, including solar panels or radioisotope thermoelectric generators.

A satellite is a moon, planet or machine that orbits a planet or star. for example, Earth is a satellite because it orbits the sun. Likewise, the moon is a satellite tv for pc as it orbits Earth. commonly, the word satellite refers to a device this is released into space and movements around Earth or another frame in area.

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In the analysis of measuring the unsteady pressure in the cylinder using the FTT method, a zero-padding required to 2¹²= 4096 or a truncation required to 2¹¹ = 2408 points.

Answer 1

The "Fast Fourier Transform" (FFT) is an important measurement method in the science of audio and acoustic measurements. It converts the signal into individual spectral components and thus provides frequency information about the signal. FFT is used for fault analysis, quality control, and machine or system condition monitoring.

Find the total data points:

N = Frequency x time

N = (259) (8)

N = 2152

The total number of data points is 2152

It is required to use the powers of 2 data points in the FTT algorithm. The nearest powers of 2 values for data points are:

2¹¹= 2408

2¹² = 4096

Therefore, there is a zero-padding required to 2¹²= 4096 or a truncation required to 2¹¹ = 2408 points.

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The work required to carry a particle with a charge of 6.0 c from a 5.0-v equipotential surface to a 6.0-v equipotential surface and back again to the 5.0-v surface is zero.

What are the properties of equipotential surface?

The electric field present around the surface is perpendicular to an equipotential surface.

Two equipotential surface can never met or intersect.

The direction is always from high potential to low potential.

If there is an isolated point charge, then the equipotential surface is a sphere.

Equipotential points are those points in an electric field that has same electric potential. If these points are connected by any line or curve, it is said to be equipotential line and the surface on which it lies is the equipotential surface.

The work done between two points in an equipotential surface is always zero. It is calculated in the following manner:

If any charge moves from point Va to Vb in an equipotential surface, then work done in moving charge

W= q0 (Va- Vb)

As (Va- Vb) = 0 so the total work is equal to zero.

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Here, the sink strength is related to the volume flow to the depth into the flat surface.

m = 271 b

where,

Q→ Total volume flow rate

b→ Ambient Depth of water

Given, Q value as 110m²/s & bas 8m. Substitute, 110 m²/sec for a 8 m for b

Now,

m = 110 m = 2.1895 m²/s

a) The distance of the downward stream,

a = m/u∝

Here,

The velocity of water currents Substitute 0.25 m/s for U∝,

2.1895 m²/s for m

= 2.1895/0.25

a = 8.758 m

∴ The distance of the downward stream a = 8.758 m.

b) The far normal to the paper the effect of intake left on each side.

L = Па

We have, a value of 8-758

So, substitute a = 8.758 frew above

L = π X 8.758 L = 27.5m

The for normal to the paper the effect of intake left on each side,

L =27.5m.

Towards or near the mouth of a stream swimming downstream. is two miles downstream.  At the end of the normal industrial process or at a post-manufacturing stage. Those that migrate downstream migrate from points further upstream towards the estuary.

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The time required to fill a 25 liter container  with water is 8.3 minutes.

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If the electric field emitted by a radio tower has an amplitude of 239 v/m,  the amplitude of the corresponding magnetic field will be H = 0.64 A/m

E / H = [tex]\sqrt{mu0 / epsilon 0 }[/tex]

238 / H = [tex]\sqrt{4*3.14*10^{-7} / 8.85 * 10^{-12} }[/tex]

238 / H = 374

H = 0.64 A/m

The amplitude of the corresponding magnetic field will be H = 0.64 A/m

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Answer:

I think that's because the force of gravity is greater than the buoyant force, and for the hot air balloons, they can increase/decrease the temperature of the air in the balloon in order for it to rise/fall for more control. For planes, they use aerodynamics as well as the help of a couple of engines to thrust the plane forward. I hope this helps.

The astronomer on duty going to have a bit of a problem satisfying your astronomy reading friend's request because it becomes too cold and dark to emit visible light.

Long after a star turns into a white dwarf, it will become too cold due to no fusion of atoms happening in its core to provide any energy. The light emitted initially is due to the hotness before the fusion has stopped to take place.

The hotness eventually cools off due to surrounding temperature. As the temperature reduces the light emitted will also decrease. After it fully becomes cold it will stop emitting light and so it cannot be seen.

Therefore, the astronomer on duty going to have a bit of a problem satisfying your astronomy reading friend's request because it becomes too cold and dark to emit visible light.

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The constant of friction between the surface and the mass of 1.5 kg being pulled with a force of 6 N is 0.408.

Friction is a force that oppose the motion between two bodies in contact.

To calculate the constant of friction between the surface and the mass, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the constant of friction between the surface and the mass is 0.408.

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The zeroth law of thermodynamic states that if two systems are in thermal equilibrium in equilibrium. with a third system, they are. with each other".

One of the four fundamental laws of thermodynamics is the zeroth law. It offers a stand-alone definition of temperature that excludes the second law's concept of entropy. Ralph H. Fowler created the law in the 1930s, many years after the first, second, and third laws had gained widespread acceptance.

According to the zeroth law, if two thermodynamic systems are in thermal equilibrium with one another and with a third system separately, then all three systems are in thermal equilibrium with one another.

The mathematical representation of thermodynamics depends on the zeroth law. It mathematically transforms the relationship between systems' thermal equilibrium into an equivalence relation, which can symbolize the equality of a particular quantity related to each system.

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The Correct option is (c) .

NaCl , has the largest (most exothermic) lattice energy by applying Coulomb's law.

Using Columbus' law of electrostatics, we have

F = q₁× q₂ / r²

where F ---> attraction between oppositely charged particles

lattice energy: strength of bond between oppositely charged ions , depends on the distance between the centers of ions when they are packed into a crystal, and the bond strength can be determined by the lattice energy.

We need to know how the lattice energy is affected by the properties of the ions. The increase in lattice energy is two properties we usually focus on. As the ion charge increases, the lattice energy increases. Reducing the size of the ions increases the lattice energy. As the ion becomes smaller, the lattice energy increases. They are all ions. Cations have the same charge as all other cations. We can see the size of the ion. The smallest cation is the one Sodiam from other cations.

Hence, NaCl have largest lattice energy.

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Complete Question

Based on Coulomb's Law of electrostatic attraction of oppositely- charged species, which of the following chlorine-containing compounds would be predicted to have the greatest (most exothernic) lattice energy? a)KCI

b)CaCl₂

c) NaCl

d)MgCl₂

The intensity is 4400 w/m2 , strength of the microwave is 1820 V/m  and magnetic field strength is606.66× 10-8 T .

What is intensity?

The power transferred per unit area is known as the intensity or flux of radiant energy, where the area is measured on a plane perpendicular to the direction of the energy's propagation. It is measured in watts per square metre (W/m2) in the SI standard.

a.) Average intensity=I

I=P/A where, P= power

A= area of the circle

= π r2

As we are given the diameter and r= d/2 , so area= π d2/4

d= 16cm= 0.16 m

area = 3.14× (0.16)×2 /4 = 0.20

P= 880W

I= 880/0.2= 4400 w/m2

b.) I =0.5 c e0 Emax2

Where c = speed of light = 3 108 m/s

e0= 8.85×10-12

Emax= peak of electric field =√ 2I / c ×e0

= √2×4400/(3×108)×8.85 ×10 -12

⇒1820 V/m  

Bmax= peak of magnetic field strength

Bmax = Emax/ c

          ⇒1820/ 3× 108

          ⇒606.6 ×10 -8 T

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Constructive interference occurs when crests of one wave overlap the crests of the other wave.

What are the properties of constructive interference?

The two waves must travel through the same medium along with the  properties of the waves must be the same. They should have same amplitude and wavelength. The amplitude of the wave is the height of the crest or trough.  Upward displacement occurs when the waves undergo constructive interference; hence, the upward displacement of the medium is greater than the displacement of the two interfering pulses.

It occurs when the phase difference between the two waves is an even multiple of π (180°).

Example:  When we see two speakers right next to each other, we can experience constructive interference when the distance from each speaker to the observer is the same. The path difference should be equal to zero.

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Answer:

Explanation:

The answer to the question related to the time for two balls to reach the ground is option C, the two balls will reach the ground at the same time because the horizontal and vertical planes of motion are independent of each other, and they are also released from the same height.  

When a ball is dropped, knowing the height we could find the time with the following equation:

(1)

Where:

: is the final height

: is the initial height

: is the initial speed of the ball in the vertical direction = 0 (it is dropped)

g: is the acceleration due to gravity

When the ball is launched horizontally from the same height, we could find the time with equation (1) since the acceleration in the horizontal direction is zero and the initial velocity in the vertical direction is also zero.

The horizontal motion is related to the equation:

  (2)

We can notice in both cases that the ball is accelerated only by gravity.

Let's evaluate each statement

A) This statement is incorrect because the path is the same for both cases. The ball is dropped and launched from the same height.

B) This statement is also incorrect. The velocity of the dropped ball is the same as the velocity of the launched ball because the ball is accelerated only by gravity.

C) This statement is correct. We can see that we would get the same time in equation (1) since , , and  is the same for the dropped ball and the launched ball.  

D) This statement is incorrect. The nature of motion is related to a freefall motion in both cases.  

Therefore, the answer is option C.

The radius of the circle is equal to 20m if the centripetal acceleration is 5m/s².

The centripetal force is perpendicular to the velocity in a circular motion. If the particles change their speeds in a circular motion then acceleration is produced and the acceleration from directing toward the center.

The mathematical Formula for the centripetal acceleration used:

a = v²/r

Where 'r' is the radius of the circle and a is the centripetal acceleration.

Given, the velocity of the ride, v = 10 m/s

The centripetal acceleration, a = 5 m/s²

The radius of the circle in which the ride is going on is :

r = v²/a

r = (10)²/5

r = 20 m

Therefore, the radius of the circle is equal to 20m.

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Benzoyle peroxide

This chemical helps to eliminate excess oil from the skin, kills acne-causing bacteria, and removes dead skin cells that can block pores. Products containing benzoyl peroxide are sold over the counter in strengths ranging from 2.5% to 10%.

He continues by saying that the petroleum jelly itself is ineffective at treating the zit. By creating a seal over the skin, it actually aids in protecting the skin barrier as the zit heals.

Scars from acne do not completely disappear on their own. With age, depressed acne scars frequently grow more obvious due to collagen loss in the skin. But there are numerous procedures that might lessen the prominence of acne scars. hyperpigmentation following inflammation or Within a few months, redness could naturally.

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The generation, consumption, conversion, and exchange of thermal energy across physical systems is the focus of the thermal engineering field of study known as heat transfer.

Despite mercury having a far higher heat conductivity than water, this doesn't really matter in this situation. Here, H represents the heat transmission. Then, a key factor in this situation is the particular temperatures of these compounds. Compared to mercury, water has a substantially higher specific heat. So, unlike how the temperature of mercury has changed, the temperature of water won't fluctuate as much. Since the mass of both substances is the same, the system's end temperature will be considerably closer to the water's initial temperature.

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The correct answer is velocity and acceleration at highest point of the ball is 0 m/s and 9.8 m/s² respectively.

How velocity and acceleration is related?

The rate of change of displacement is known as velocity. The rate at which velocity changes is called acceleration. Due to the fact that it includes both magnitude and direction, velocity is a vector quantity. As the rate at which velocity changes, acceleration is likewise a vector quantity.

When a body is thrown vertically upward, it will travel along a route determined by the Earth's gravitational pull. Projectile motion is described as the motion. The gravitational pull and the air drag force both work against the ball when it is in motion.

Thus, velocity and acceleration at highest point will be 0 m/s and 9.8 m/s² respectively.

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The speed and direction of motion of particle B is 2v₀/3 m/s towards left.

Potential energy is stored electricity that relies upon the relative function of various elements of a device. Spring has more capacity energy when it's miles compressed or stretched. A metallic ball has greater potential energy raised above the ground than it has after falling to Earth.

Potential energy is the electricity held by using an object due to its function relative to other objects, stresses within itself, its electric-powered charge, or different factors.

K.E₁ + P.E₁ = K.E₂ + P.E₂

1/2Mv² + G/r² = 1/2Mv² + G/r²

1/2Mv² = 1/2mv²

v² = v²

Va = Vb

V = 2v₀/3 m/s towards left.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Particle A and particle B, each of mass M, move along the x-axis exerting a force on each other. The potential energy of the system of two particles associated with the force is given by the equation U=G/r 2, where r is the distance between the two particles and G is a positive constant. The speed and direction of motion of particle B is?

The lower the ph value the larger the concentration of hydrogen ions.

In chemistry, pH, historically denoting "potential of hydrogen", is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions.

A pH of 7 is neutral. A decrease in pH below 7 shows an increase in acidity (hydrogen ions), while an increase in pH above 7 shows an increase in alkalinity (hydroxyl ions). Each pH unit represents a 10-fold change in concentration.

The lower the ph value the larger the concentration of hydrogen ions.

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Borgmann provides the example of running as a focal practice and distinguishes it from running on a treadmill in that running (outside) engages the mind and body, while running on a treadmill only engages the body.

Focal practice is human activity that demands patience, skill, and attentiveness. They make life feels meaningful not because of what they produce, but because of what they are. These activities are not accomplished effortlessly. They require focus, engagement, and commitment to achieve their goal.

Some examples of focal practice activities are meditation, gardening, hiking, preparing a meal, tending a fire, and learning a musical instrument.

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Suppose each of the following objects could collapse into a black hole. Each black hole would have a sphere around it that is the limit for escape -- once you are inside this region, you cannot get away. An entire galaxy of stars would be this region that will be largest in diameter.

Strong magnetic field surrounding a black hole. A black hole is a very dense object whose gravity is so powerful that nothing can escape from it, not even light. The smallest speed at which anything needs move in order to escape the gravitational field of an object is known as the "escape velocity" for every object in space.

Most black holes are created from the remains of massive stars that explode in supernovae. Smaller stars eventually develop into dense neutron stars, which lack the mass necessary to confine light.

The discovery, which is slightly under 1,600 light-years away, raises the possibility that binary systems contain a substantial number of dormant black holes. The closest black hole to Earth so far has been identified as Gaia BH1, which may be seen in this artist's conception close to its Sun-like partner star.

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To generate a larger emf with the bar magnet one should move the magnet faster through the coil and add more turns to the coil.

An energy transfer to an electric circuit per unit of electric charge, expressed in volts, is known as electromotive force in electromagnetism and electronics. Electrical transducers are devices that create an emf by transforming non-electrical energy into electrical energy.

A rectangular section of an object with permanent magnetic qualities that is formed of ferromagnetic material is known as a bar magnet.

A shift in magnetic flux is an induced EMF's most fundamental cause. Placing a coil that is constantly moving and conducting current in a magnetic field that is static and stable. EMF will be produced as a result of the area vector changing as a result of this.

You should have observed that the voltage peaked in one direction for moving the magnet in hand peaked in the other direction for moving the magnet out this is because according to Faraday's Law, a voltage is produced in a coil of wire when a magnet is moved inside of it, altering the magnetic field and magnetic flux through the coil. The galvanometer deflects to the left in the example below as the magnet is moved inside the coil in response to the growing field.

Hence, To generate a larger emf with the bar magnet one should move the magnet faster through the coil and add more turns to the coil.

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The force transmitted to the man's leg bones during his downward motion is 14,945 N

State the equations of motion

The fundamentals of an object's motion, such as its position, velocity, or acceleration at different periods, are described by kinematics equations of motion or Newton’s equations of motions.

An object's motion in 1D, 2D, and 3D is controlled by these three equations of motion-

First law of equation: v = u + at

Second law of motion: s = ut + at^2/2

Third law of motion: v^2=u^2 + 2as.

In the question, the following informations are given,

Mass of the man, m = 70kg

Height the man jumps, h = 1.00 m

Time taken to reach the ground, t = 0.02 seconds

Using the 3rd equation of motion we find out the velocity with which the man comes down as-

v^2 = u^2 +2gh

v^2 = 0 + 2 x 9.8 x 1

v^2 = 19.6

v = √19.6

  = 4.27 m/s

Since force is determined by both time and acceleration therefore using the formula of force we find out the velocity as-

F = mass x acceleration

  = mass x velocity/time

  = 70 x 4.27/ 0.02

  = 14,945 N

Hence, the force transmitted to his leg bones is 14,945 N

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