what is the focal length of a pair of contact lenses that allow a far-sighted woman with a near-point distance of 40 cm to read a book held only 30 cm from her eyes?

Answer:

because liquid and solid states of water possesses intermolecular force of attraction which held the molecules of water in fixed

The reason no energy-using device operates at 100% efficiency and some energy is lost as heat, is explained by (a) the second law of thermodynamics. This law states that in any energy conversion process, the entropy (disorder) of the system increases, which leads to some energy being lost as heat.

The second law of thermodynamics states that in any energy conversion process, some energy will inevitably be lost as heat, and this loss is unavoidable. The first law of thermodynamics, on the other hand, states that energy cannot be created or destroyed, but it can be converted from one form to another. The conservation of momentum law deals with the conservation of linear momentum in a system, while Darcy's law describes the flow of fluids through porous materials. Newton's third law of momentum states that for every action, there is an equal and opposite reaction.

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Explanation:

it moves at a speed of 76 km/h hence the distance covered in an hour is 76 km

Answer:

Weight is a body's relative mass, or the quantity of matter contained by it.

Explanation:

Hope this helps

Answer:

Change in Potential energy, pe = Final potential energy - Initial potential energy

Explanation:

∆p.e = Final p.e - Initial p.e

From the equation ∆p.e = (mgh) final - (mgh) initial

The force of the table on both bucket A and  bucket B is the same.

According to Newton's second law of motion, the weight of an object is equal to its mass times the acceleration due to gravity (W = mg), where m is the mass of the object and g is the acceleration due to gravity. The weight of a bucket does not depend on whether it is filled with water or empty, as both the water and the bucket have the same acceleration due to gravity.

Therefore, the force of the table on both buckets is the same. This principle is the same reason why a person weighs the same on a scale whether they are standing still or jumping up and down.

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Answer: 110 lbs?

Explanation: there are 2.2 pounds in 1 kilogram. 50 x 2.2 = 110

The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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The hydrogen bubbles would increase the Reynolds number of the wire

The presence of hydrogen bubbles in a fluid can increase the Reynolds number of the fluid flow around a wire, as the bubbles can increase the fluid turbulence and change the fluid viscosity.

This in turn affects the fluid flow patterns and can lead to changes in the drag force acting on the wire, which is an important factor in determining the Reynolds number. However, the exact effect of hydrogen bubbles on the Reynolds number would depend on various factors such as the size, frequency and velocity of the bubbles, as well as the fluid properties and the geometry of the wire.

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Answer: Larger net forces are required to accelerate objects that have more mass

Explanation:

The acceleration of rate mobile is 30 m/s².

Given - Initial velocity=80m/s , Final Velocity=200m/s , time= 4sec

To find out acceleration.

Principle- Acceleration means rate of change of velocity. Mathematically derivative of velocity with the function of time is acceleration.

a=dv/dt

a=(vₙ-v )/dt

substitute vₙ=200m/s  , v=80m/s , dt=4sec

a= [ 200 -80 ]/4

a= 120/4

acceleration ⇒ a=30 m/s²

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365.25 or 366.25 in a leap year

Answer:

step by step explanation:

Physics

Answer:

I would say physics

Explanation:

Astrology has been rejected by the science community

Football statistics is Physical athletic stuff

and language studies is Ela

Examples of radiation are from the burner to air that is not touching it. In the surrounding air as air currents develop. The correct options are A and B.

Radiation is the emission or transmission of energy through a material medium or across space in the form of waves or particles. Radiation is the heat transfer method in which the heat is transferred without any direct contact between the two objects.

Given that a pot of water is heated on a gas-flame stove and begins to boil. Which two transfers of thermal energy are involved?

Here the heat is transferred through the radiation in which no direct contact is there between the two objects. The two thermal heat transfer energies are from the burner to air that is not touching it and In the surrounding air as air, currents develop.

Therefore, examples of radiation are from the burner to air that is not touching it. In the surrounding air as air currents develop. The correct options are A and B.

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The kinetic energy of a electron that passes undeviated through perpendicular electric and magnetic field is 1.2 × 10⁻²⁶ kg.m².s⁻² .

Given here is ,

q = 1.60218 × 10⁻¹⁹ C

m = 9.10939  × 10⁻³¹ kg

E = 0.18 kV/m = 180 V/m

B = 1.1 mT

where,

q is charge on electron

m is mass of electron

E is electric field

B is magnetic field

We know the kinetic energy of electron is calculated by

K.E = 1/2 (mv² )

∴ v = F / qB

∵ F = Eq

∴ F = 180 × 1.60218 × 10⁻¹⁹

∴ F = 288.3 × 10⁻¹⁹

∴ F = 2.8 × 10⁻¹⁷ N

Now,

v = F / qB

∴ v = (2.8 × 10⁻¹⁷ ) / (1.60218 × 10⁻¹⁹ ×1.1 )

∴ v = (2.8 × 10⁻¹⁷ ) / (1.7  × 10⁻¹⁹ )

∴ v = 1.64 × 10²

∴ v = 164 m.s

Now to calculate K.E,

K.E = 1/2 (mv² )

∴ K.E = 1/2 (9.10939  × 10⁻³¹ × 164²)

∴ K.E = 1/2  (9.10939  × 10⁻³¹ × 26896)

∴ K.E = 1/2 (245006.15   × 10⁻³¹ )

∴ K.E = 122503   × 10⁻³¹

∴ K.E = 1.2 × 10⁻²⁶

Hence , the kinetic energy of electron is 1.2 × 10⁻²⁶  kg.m².s⁻².

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the change in direction of a wave passing from one medium to another caused by its change in speed this is from my study guide hope that helps

example: when you are sitting in a pool and ur leg looks deformed or even cut in half its caused my refraction.

The thermal energy created when the crate slides at the given distance is 6,192.8 J.

The given parameters;

The thermal energy created is the energy lost due to friction and it is calculated as follows;

\(W = \mu F_n d\)

where;

\(\mu\) is the coefficient of friction

The coefficient of friction is calculated as;

\(\mu = tan(\theta)\\\\\mu = tan(35)\\\\\mu = 0.7\)

The work done against friction is calculated as;

\(W = \mu F_n d\\\\W = \mu (Wcos\theta ) d\\\\W = 0.7 \times 900 \times cos(35) \times 12\\\\W = 6,192.8 \ J\)

Thus, the thermal energy created when the crate slides at the given distance is 6,192.8 J.

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When the wave receptor and wave source move relative to one another, the frequency of the wave remains constant. This phenomenon is known as the Doppler effect.

The Doppler effect is the change in the observed frequency of a wave when the wave source or receiver is moving relative to one another.

When the wave source and the wave receptor move relative to one another, the frequency of the wave remains the same because the frequency of a wave is determined by the source of the wave, not the observer's relative motion.

Relatively, the wavelength and the wave speed of the wave changes.

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Explanation:

Find an energy is E=mgh, so E=18*10*10=1800J

The momentum of a muon traveling at 0.996 c is approximately 5.921 x 10⁻²² kg m/s.

the momentum of a muon traveling at 0.996 c, we'll use the relativistic momentum formula:

p = (m × v) / sqrt(1 - (v² / c²))

Here, m is the mass of the muon, v is its velocity, and c is the speed of light (approximately 3 x 10⁸ m/s).

Given that the muon's mass at rest is 207 times the electron mass, we can calculate its mass:

muon mass = 207 electron mass = 207 × 9.109 x 10⁻³¹ kg ≈ 1.887 x 10⁻²⁸ kg

Now, we'll plug in the values for the muon's mass (m), velocity (0.996 c), and the speed of light (c) into the relativistic momentum formula:

p = (1.887 x 10⁻²⁸kg × 0.996× 3 x 10⁸ m/s) / √(1 - (0.996)²)

p ≈ 5.921 x 10⁻²² kg m/s

So the momentum of the muon traveling at 0.996 c is approximately 5.921 x 10⁻²² kg m/s.

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Answer:

4.  wavelength (λ)

5.  slit distance (d)

Explanation:

I assume you did a double-slit experiment?  If so, then:

The number of bands observed on the screen depends on the wavelength (λ) and the slit distance (d), while the screen distance (L) does not directly affect the number of bands.

Wavelength (λ): The number of bands is directly proportional to the wavelength. When the wavelength increases, the fringe separation on the screen increases, resulting in a greater number of bands.

Slit distance (d): The number of bands is inversely proportional to the slit spacing (distance). When the slit spacing increases, the fringe separation on the screen decreases, resulting in a smaller number of bands.

Screen distance (L): The screen distance does not directly affect the number of bands. It primarily affects the size and overall pattern of the interference fringes but does not change the number of bands.

Summary:

Wavelength (λ) is directly proportional to the number of bands.

Slit distance (d) is inversely proportional to the number of bands.

Screen distance (L) does not directly affect the number of bands.

The delta Internal energy u for a system which has the following two steps is zero.

E = q + w

where q = heat and w = work completed

Q is positive when the system absorbs heat.

Q is negative when the system emits heat.

When the mechanism is functioning, w is negative.

The system performs better when work is done on it.

Step 1

E1 = 60 KJ + 40 KJ = 100 KJ.

E2 = (30 KJ + 70 KJ = (-100 KJ)

E1+E2=100KJ+(-100)KJ = 0KJ

Internal energy is the total internal energy of a thermodynamic system. It consists of both internal kinetic and potential energy contributions and is the energy needed to create or prepare the system in its internal state at the time. It keeps track of the system's energy gains and losses as a result of adjustments to its internal condition. [1][2] Both the system's total kinetic energy of motion and any external energies from the surrounding force fields are excluded. The cornerstone of the first law of thermodynamics, the law of conservation of energy, is the notion that the internal energy of an isolated system remains constant. Internal energy has a wide range of facets.

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The detailed answer of this question is given below:

The furnace is an  internal                  combustion engine.

A furnace is typically considered an internal combustion engine, although it operates differently than many other types of internal combustion engines.

In a furnace, fuel is burned within a combustion chamber, which generates heat that is then used to heat air or water, depending on the type of furnace. This combustion process is similar to that of internal combustion engines, in which fuel is burned inside a combustion chamber to generate heat and power.

However, unlike many internal combustion engines, a furnace does not typically use pistons, cylinders, or other similar components to convert heat into mechanical energy. Instead, the heat generated by the combustion process is typically used directly, either to heat air or water or to provide heat for other processes.

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Answer:

Freudian

Explanation:

Answer:

Freudian

Explanation:

We know that

• The initial speed is 5.8 m/s.

• The time elapsed is 1.1 seconds.

• The final speed is zero because it will stop.

Let's find the acceleration. We have to use a formula that involves the initial speed, the time spent, the final speed, and acceleration.

Now we use the given magnitudes to solve for a.

(a) The magnitude of the chicken's acceleration is -5.3 m/s^2.

Now, to find how far the chicken slid, we have to use a formula that includes distance.

Let's use the magnitudes we know to find d.

(b) The chicken slid 3.2 meters.

As you can observe, the positive direction of the movement is towards the home plate. So, the acceleration is towards the third base because it's negative, that is, the chicken is slowing down to get to home plate.

Therefore, the direction of the acceleration is towards the third base.

The direction of the conventional current induced in the loop as it leaves the field depends on the direction of the magnetic field and the orientation of the loop.

According to the right-hand rule, if the magnetic field points upwards and the loop is oriented so that its normal vector points to the right, the conventional current induced in the loop will flow in a clockwise direction as it leaves the field.

Conversely, if the magnetic field points downwards and the loop is oriented so that its normal vector points to the left, the conventional current induced in the loop will flow in a counterclockwise direction as it leaves the field.

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The telescope created the data gathered by Kepler and his team.

What is a star?

A star is a large luminous astronomical body which produces light and heat energy as well as radiation.

There are billions of stars in the universe organized into galaxies.

The Sun is the star of our solar system.

The Kepler project produced a wide range of data products and documentation to assist the community in using data from the mission to help study both exoplanets and other astrophysical areas.

In the video, a mysterious star was observed which is 50 percent bigger and 1,000 degrees hotter than the Sun.

By mean of telescopes, it was observed that the dimming seen in the diet was dues to dust particles.

These data produced ranges from engineering data on the detectors to lists of planet candidates and includes many of the intermediate data products in the data processing path.

The Kepler first mission came to an end after four years when two of the four reaction wheels, used to point the spacecraft malfunctioned.

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The football player applies a pressure of 30 Newtons per square meter (N/m²) to the grass.

Pressure is a physical quantity that measures the force exerted per unit area on a surface. It is defined as the force applied perpendicular to the surface divided by the area over which the force is distributed. In simpler terms, pressure is the amount of force distributed over a given area.

To calculate the pressure the football player applies to the grass, we can use the formula:

Pressure = Force / Area

Given that the force exerted by the player's shoes on the grass is 12N and the surface area of the shoes is 0.4m², we can substitute these values into the formula:

Pressure = 12N / 0.4m²

Pressure = 30 N/m²

Therefore, the football player applies a pressure of 30 Newtons per square meter (N/m²) to the grass.

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The wavelength of the x-rays emitted when an electron beam strikes a block of copper is approximately 1.52 × 10⁻¹² m. When an electron beam strikes a block of copper, x-rays of frequency 1.97 × 10¹⁹ Hz are emitted.

To find the wavelength of these x-rays, we will use the equation: c = νλwhere c is the speed of light, ν is the frequency of the x-rays, and λ is their wavelength.

We know the frequency of the x-rays, so we can plug that into the equation: c = 3.00 × 10⁸ m/s (speed of light)ν = 1.97 × 10¹⁹ Hz (frequency of x-rays)λ = ?

We can then rearrange the equation to solve for the wavelength:λ = c/νλ = (3.00 × 10⁸ m/s)/(1.97 × 10¹⁹ Hz)λ ≈ 1.52 × 10⁻¹² m.

Thus, the wavelength of the x-rays emitted when an electron beam strikes a block of copper is approximately 1.52 × 10⁻¹² m.

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