in a tape recorder, the tape is pulled past the read-write heads at a constant speed by the drive mechanism. consider the reel from which the tape is pulled: as the tape is pulled off, the radius of the roll of remaining tape decreases. (a) how does the torque on the reel change with time? increases decreases stays the same (b) if the tape mechanism is suddenly turned on so that the tape is quickly pulled with a large force, is the tape more likely to break when pulled from a nearly full reel or from a nearly empty reel? nearly full nearly empty equally likely

Answer:

v₂ = 1.8 [m/s]

Explanation:

To be able to solve this problem we must raise the principle of conservation and quantity of movement. It is going to study the momentum before and after the firing of the rifle.

P = m*v

where:

P = momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Now we need to analyze the moment before and after the shot.

\((m_{1}+m_{2})*v_{1}=-(m_{1}*v_{2})+(m_{2}*v_{3})\)

where:

m₁ = mass of the rifle = 5 [kg]

v₁ = velocity of the rifle and the bullet before firing = 0 (no movement)

m₂ = mass of the bullet = 15 [g] = 0.015 [kg]

v₂ = velocity of recoil [m/s]

v₃ = velocity of the bullet after firing = 600 [m/s]

Now replacing:

\((5+0.015)*0 = -(5*v_{2})+(0.015*600)\\9 = (5*v_{2})\\v_{2}=1.8 [m/s]\)

Momentum is the product of mass and velocity. The recoil velocity of the rifle weighing 5 kg is 1.8 m/s.

According to the law of conservation of momentum if two objects are in contact with each other then for that system of the two objects the momentum of the object before will be equal to the momentum of the object after the collision.

GIven to us

Mass of the rifle, M = 5 kg

Mass of the bullet, m = 15 g = 0.015 kg

Velocity of the bullet afterwards, v₂ = 600 m/s

We know that according to the law of conservation of momentum, the momentum of the bullet and riffle before shooting will be equal to the momentum of the bullet and riffle after shooting.

\(Mu_1 + mu_1 = Mv_1 + mv_2\)

Since, before shooting the bullet was in the riffle and the velocity of both was 0,

\(M(0) + m(0) = Mv_1 + mv_2\\\\-Mv_1 = mv_2\\\\v_1 = -\dfrac{m \times v_2}{M}\)

Substitute the values,

\(v_1 = -\dfrac{0.015 \times 600}{5}\\\\v_1 = -1.8\rm\ m/s\)

Thus, the recoil of the rifle is -1.8 m/s, the negative sign denotes that the velocity of recoil was in opposite direction to the bullet.

Hence, the recoil velocity of the rifle weighing 5 kg is 1.8 m/s.

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Answer:

The distance is 1.04 m and time is 0.16 seconds.

Explanation:

Initial speed, u = 6.75 m/s

Final speed, v = 5.91 m/s

Acceleration, a = -5.11 m/s²

We need to find the distance Rickey slides across the ground before touching the base and the time he sliding for before touching the base.

Let d is the distance. It can be calculated using third equation of motion as follows :

\(v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{(5.91)^2-(6.75)^2}{2\times (-5.11)}\\\\d=1.04\ m\)

Let t is the time he slides for before touching the base. Using first equation of motion as follows :

\(t=\dfrac{v-u}{a}\\\\t=\dfrac{5.91-6.75}{-5.11}\\\\t=0.16\ s\)

So, the distance is 1.04 m and time is 0.16 seconds.

The earth has a curved surface. This statement explains this observation.

Due to the curvature of the Earth's surface, the spacecraft seems to drop beyond the horizon as it travels away from the spectator. An object's apparent descent below the horizon increases with increasing distance. On the open ocean, where there are no other things to serve as a reference point for the spectator, this impact is more obvious.

Because of the spherical form of the Earth, when viewed from a great distance, the surface curves away from the observer's line of sight. Ships, buildings, and other distant objects appear to drop beyond the horizon due to a phenomenon known as the "curvature of the Earth".

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Answer:

For an object resting upon a non-accelerating surface, the normal force is equal to the ... Suppose that a person weighs 800 N and sits at rest upon a table. ... applying a downward force of 200 N. With the additional downward force of 200 N acting upon the person, the total upward force must be 1000 N.

Explanation:

Answer:

a = 5 m / s²   and    x = 562.5 m

Explanation:

Let's apply the kinematics relations

          v = v₀ + at

          v² = v₀² + 2a x

In this case, as the car stops, its final speed is zero (v = 0) and the acceleration must be opposite to the speed, that is, negative

           0 = v₀ - a t

           a = v₀ / t

let's calculate

           a = 75/15

           a = 5 m / s²

let's look for the distance

           0 = v₀² - 2a x

           x = v₀² / 2a

let's calculate

           x = \(\frac{75^2}{2 \ 5 }\)

           x = 562.5 m

Answer:

1. 3000 N

Explanation:

you multiply 1000kg and 3

Answer:

2. acceleration will double

The acceleration will increase for example: 4/2=2 m/s^2 and if you double 4 it will be 8/2=4 m/s^2. Which means the acceleration also doubles.

1) Note that the Roof is dark colored. Given the laws of physics, it will absorb all light.

2) the window is transparent, hence, it will transmit ALL light.

3) the door is dark-colored but has some glass on it. Thus, it will absorb MOST but not all light.

4) the side of the building which is painted white will reflect all light.

Note that dark surfaces absorb light because they are able to absorb photons, or particles of light, and convert them into other forms of energy.

This is because the atoms and molecules in dark surfaces have a large number of unpaired electrons that are able to absorb the energy of photons and transition to a higher energy state.

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The fraction of an unpolarized beam of light that will pass through all three polarizers is 1/8 or 0.125.

In general, when an unpolarized light is sent through a polarizer, only half of the light will pass through. When a second polarizer is placed in front of the first one, the amount of light transmitted is proportional to the square of the cosine of the angle between the axes of the two polarizers.

If the second polarizer is placed at 45° with respect to the first one, the transmitted intensity is half of the intensity transmitted by the first polarizer, i.e. one-fourth of the intensity of the incident light.

If a third polarizer is placed between the two crossed polarizers at an angle of 45° with respect to both of them, the transmitted intensity is half of the intensity transmitted by the second polarizer, i.e. one-eighth of the intensity of the incident light.

Therefore, the fraction of an unpolarized beam of light that will pass through all three polarizers is 1/8 or 0.125.

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Answer:

im going to guess the 3rd one

Explanation:

Answer:

2cm/year

Explanation:

20000/10000=2cm/year

The charge on the positive plate of a capacitor depends on the voltage across the capacitor and the capacitance of the capacitor.

A capacitor is an electrical device used to store electrical energy in an electric field. It consists of two metal plates separated by a dielectric material, such as air or plastic. When a voltage is applied across the plates, a charge accumulates on each plate, creating an electric field between them. The capacitor is said to be charged.

The capacitance of a capacitor depends on the distance between the plates, the area of the plates, and the dielectric material between them. The unit of capacitance is the farad (F). Capacitors are commonly used in electronic circuits for various purposes, such as filtering, coupling, and timing. They can also be used as energy storage devices, for example, in camera flashes or defibrillators.

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Answer:

The answer to this is D two of the above

the restoring force exerted by the spring will also decrease, resulting in a longer time period of oscillation and a greater equilibrium extension of the spring.

a) Explanation of the reason why mass performs simple harmonic motion:

The mass performs simple harmonic motion because it is suspended from a spring, which exerts a restoring force on the mass in the opposite direction to the displacement of the mass.

The magnitude of the restoring force is proportional to the displacement of the mass from the equilibrium position, and acts towards the equilibrium position. Hence, when the mass is displaced from its equilibrium position, the spring exerts a restoring force that is proportional to the displacement.

This results in simple harmonic motion.

b) Calculation of the spring constant:

Let x be the distance pulled by the mass, then the amplitude,

A = x/20.

The time period, T = 34/20 = 1.7 s.

The frequency, f = 1/T = 0.588 Hz.

The angular frequency, ω = 2πf = 3.7 rad/s.

The mass, m = 0.5 kg.

The spring constant, k can be determined from the formula:

k = mω²/A

After substituting the values:

k = 0.5 x (3.7)² / (0.025)k = 101.5 N/mc)

Calculation of the equilibrium extension of the spring:Equilibrium position occurs when there is no force acting on the mass. Hence, when the mass is in its equilibrium position, the weight of the mass is balanced by the upward force exerted by the spring.

Therefore, we have:

m x g = k x x0

where x0 is the equilibrium extension of the spring.Substituting the values, we get:

0.5 x 9.8 = 101.5 x x0x0 = 0.048 m or 4.8 cm.

d) The effect of the time period of oscillation and the equilibrium extension of the spring when the mass and spring are moved to the surface of the moon:When the mass and spring are moved to the surface of the moon, the weight of the mass will change due to the different gravitational field strength on the moon. The weight of the mass will decrease, because the gravitational field strength on the moon is less than that on the earth.

Therefore, the restoring force exerted by the spring will also decrease, resulting in a longer time period of oscillation and a greater equilibrium extension of the spring.

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11.3 g/cm³ equals to 1130  kg/m³.

The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol ρ, however Latin letter D may also be used. Density is calculated mathematically by dividing mass by volume.

Given that 11.3 g/cm³.

Know that

1000 grams = 1 kg

1 grams = 1/1000 kg.

100 cm = 1 m

1 cm = 1/100 m.

Therefore, 1 cm³ = (1/100)³ m³

= 1/1000000 m³

Hence, 1  g/cm³ = (1/1000) ÷ (1/1000000)  kg/m³

= 1000000/1000 kg/m³

= 1000 kg/m³.

Hence, 11.3 g/cm³ = (11.3 × 1000) kg/m³

= 1130  kg/m³

Hence, 11.3 g/cm³ equals to 1130  kg/m³.

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Yes, an impulse is defined as the change in momentum of an object. When an external force is applied to an object for a period of time, the object's momentum changes.

The impulse is equal to the change in momentum, and it is equal to the force multiplied by the time over which the force was applied. Mathematically, the impulse is given by the formula:

Impulse = Force x Time

And the momentum of an object is given by the formula:

Momentum = Mass x Velocity

So, if a force is applied to an object for a time period and the object's velocity changes as a result, then the impulse experienced by the object is equal to the change in momentum. This can be expressed as:

Impulse = Final Momentum - Initial Momentum

where the final momentum is the momentum of the object after the force is applied, and the initial momentum is the momentum of the object before the force is applied.

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The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.

The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object

The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag

The reason the above selected parameters are the correct unknowns is as follows;

The known parameter;

The speed of the feather the student drops off the building's top = 1.5 m/s

The required parameter;

The unknown parameters

Method;

Determine the terminal velocity parameters of the feather

The terminal velocity, \(\mathbf{V_t}\), of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation

\(Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}\)

Where;

\(\mathbf{V_t}\) = Terminal velocity = The constant speed of the feather

m = Mass of the feather

g = Gravitational acceleration

ρ = Air density

A = The feather's projected area

\(C_d\) = Drag coefficient

The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, \(\mathbf{V_t}\);

Plugging in \(\mathbf{V_t}\) = 1.5 m/s gives;

\(V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}\)

Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;

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false

i just researched it it’s not true

1. Five major external forces that affect organizations are economic, social, cultural, demographic, and technological. Economic factors such as inflation and interest rates can impact a company's profitability and purchasing power. Social factors like changing consumer preferences and lifestyles can influence demand for products and services.

Cultural factors like values and beliefs can shape consumer behavior and market trends. Demographic factors such as population size and age distribution can affect target markets.

Technological factors like advancements in automation or digitalization can disrupt industries and create new opportunities. These external forces shape the business environment and organizations must monitor and adapt to them to stay competitive.

2. Gathering competitive intelligence is crucial for businesses because it provides valuable insights about their competitors' strategies, strengths, weaknesses, and market position.

By understanding the competitive landscape, businesses can identify opportunities and threats, make informed decisions, and develop effective strategies.

Competitive intelligence helps businesses stay ahead of their competitors, anticipate market trends, identify emerging technologies, and improve their own products or services. It allows businesses to benchmark their performance, evaluate their competitive advantage, and identify areas for improvement.

Ultimately, gathering competitive intelligence empowers businesses to make proactive and strategic decisions that can lead to sustainable growth and competitive advantage.

3. In business, various economic variables need to be monitored as they have significant impacts on strategy applications. Some important economic variables include GDP (Gross Domestic Product), inflation rate, exchange rates, interest rates, consumer spending, unemployment rate, and industry-specific factors like raw material prices or energy costs.

Monitoring these variables helps businesses understand the overall economic conditions, identify market opportunities, and assess potential risks. For example, a high inflation rate may impact pricing strategies, while a favorable exchange rate can benefit export-oriented businesses.

By monitoring economic variables, businesses can adapt their strategies accordingly and make informed decisions to navigate the dynamic business environment.

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The lowest 19.152 \(\frac{w}{m^{2} }\) frequency that will produce the maximum intensity (Imax) at the observer, assuming the observer will still hear an intensity of 6 w/m2 when \(S_{1}\) or \(S_{2}\) is heard alone.

We have \(I_{1} =I_{2}\)

\(= 6 w/m^{2}\)

Path difference

δ = 5.6568 - 4

δ = 1.6568 m

v = 335 m/s

Intensity I = \(4I_{1} cos^{2}\)(πδ/λ)

\(= 4I_{1} cos^{2}\)(πδf/v)

\(= 4 * 6 cos^{2}(\frac{\pi *1.6568*30}{335} )\)

I = 19.152 \(\frac{w}{m^{2} }\)

the lowest frequency is selected to cowl the N-point signal at its coarsest scale with the aid of the default wavelet's two-time popular deviations. the very best frequency wavelet bandpass filter out loses half of of its height importance at the Nyquist frequency because of the most frequency.

guy's voice has the lowest frequency in comparison to other sounds seeing that frequency and pitch cross hand in hand. Pitch denotes the voice's shrillness. the man's voice is the selection with the least strident tone. It, therefore, has the bottom pitch of all and for this reason the bottom frequency.

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Answer: Increases, decreases

Explanation:

As the volume of a chamber decreases the pressure inside the chamber increases. As the volume increases the pressure decreases

Answer:

When the Sun, the Earth, and the Moon are all aligned in space, a lunar eclipse occurs. The Moon reflects the Sun's light onto the Earth. The Earth gets in the way of the Sun in this case, keeping sunlight from reaching the moon. A lunar eclipse happens if this alignment is ideal.

Explanation:

Rephrased it so u dont have to<3 Hope this helped!

El factor mas importante para el exceso de peso es un  exceso de energía creada por una alimentación excesiva

El peso de un cuerpo es definido por la relación entre la energía requerida para los procesos vitales del cuerpo, sus actividades físicas diarias y la energía suministra en forma de alimentos.

Cuando estos dos parámetros están en balance el peso es estable. Cuando la cantidad de alimentos aumenta o el valor energético de los mismo aumenta se tiene un exceso de energía que el cuerpo almacena en forma de grasa corporal, este el el factor mas importante para el exceso de peso.

En conclusión el factor mas importante para el exceso de peso es un  exceso de energía por una alimentación excesiva

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The conditions necessary to produce a solar eclipse are the moon's position in relation to the sun and Earth, as well as the Earth's position in relation to the sun. A solar eclipse can only occur during a new moon and can be total, partial, or annular.

A solar eclipse is an occurrence when the moon transits between the sun and the Earth, blocking the sun's light and casting a shadow on the Earth's surface.

The conditions needed to produce a solar eclipse are the moon's position in relation to the sun and Earth, as well as the Earth's position in relation to the sun. A solar eclipse only occurs during a new moon when the sun, moon, and Earth are aligned in a straight line with the moon between the sun and Earth.

This occurs approximately twice a year. There are three types of solar eclipses: total, partial, and annular. In a total solar eclipse, the moon completely covers the sun's disk, causing a total blackout.

A partial solar eclipse occurs when the moon covers only a portion of the sun's disk. An annular solar eclipse occurs when the moon is at its farthest point from the Earth and appears smaller, creating a "ring of fire" around the sun.

For a solar eclipse to occur, the moon must be in its new phase, which means it must be on the same side of the Earth as the sun. During this time, the moon's shadow falls on the Earth's surface, creating a path of totality or partiality.

The path of totality is the area where a total solar eclipse can be observed, while the path of partiality is the area where a partial solar eclipse can be observed. In conclusion, a solar eclipse occurs when the moon passes between the sun and the Earth, casting a shadow on the Earth's surface.

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Answer:

dttydghcghcghdytdftygfvghxk,ghc

Explanation:

Renewable energy

Advantages :-

1. Easily regenerate

2. Boost economic growth

3. Easily available

4. Support environment

5. Low maintenance cost

Disadvantages :-

1. Weather dependency

2. High installation cost

3. Noise caused by wind energy

4. Fluctuation problem (solar)

5. Intermittency issue (wind)

Non-renewable energy

Advantages :-

1. Concentrated energy source

2. Reliable energy source

3. Can be built anywhere

4. No radioactive waste

Disadvantages :-

1. Produces greenhouse gases

2. Contributes to global warming

3. Produces acid rain

4. Harmful to environment when they are burnt

I hope this helps.....

The relative velocity of airplane B with respect to A is 924.95 mph in a direction 19.38° northeast of south.

Airplanes A and B are traveling southwest with speed |VA| = 550 mph and northwest with speed |VB| = 450 mph.

Take a reference frame in which airplane A is stationary, and airplane B moves with a velocity VB with respect to A.

Therefore, the velocity of B with respect to A is given by V = VB - VAWhere VB and VA are the velocities of B and A, respectively.

To determine the relative velocity V = VB - VA of B with respect to A, we need to obtain the vector components of the velocity of the two planes.

For that, we draw the velocity vectors of A and B in the reference frame of A as shown in the figure below:

Velocity vectors of A and BAs we can see from the figure above, the velocity of airplane A is towards southwest with a speed of 550 mph, while that of airplane B is towards northwest with a speed of 450 mph.

Therefore, the vectors VA and VB are given as:VA = -550i - 0jVB = +450cos 45°i + 450sin 45°j = +318.2i + 318.2j (Note: cos 45° = sin 45° = 1/√2)

Hence, the relative velocity of airplane B with respect to A is given by:V = VB - VA= (318.2i + 318.2j) - (-550i - 0j)= 868.2i + 318.2j

The magnitude of the relative velocity V is given by|V| = sqrt[(868.2)^2 + (318.2)^2] = 924.95 mphTherefore, the relative velocity of airplane B with respect to A is 924.95 mph in a direction 19.38° northeast of south.

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Answer:

Magnetic energy can be transformed into kinetic energy in a variety of ways.

Explanation:

One way that this occurs is through electromagnetic induction. This occurs when a changing magnetic field induces an electric current in a conductor, such as a wire. This induced current creates a force that can move the conductor, thus transforming the magnetic energy into kinetic energy. This process is used in electric generators, which convert the kinetic energy of a turbine into electrical energy by turning a coil of wire inside a magnetic field.

Another way that magnetic energy can be transformed into kinetic energy is through the operation of an electric motor. An electric motor uses the interaction between a magnetic field and an electric current to create a force that can rotate a shaft, thus transforming the electrical energy into kinetic energy. Electric motors are used in a wide range of applications, including transportation, manufacturing, and household appliances.

Magnetic energy can also be transformed into kinetic energy through magnetohydrodynamics (MHD), which involves the interaction of a fluid with a magnetic field. When a fluid such as a gas or liquid moves through a magnetic field, it can generate a force that can propel the fluid, thus transforming the magnetic energy into kinetic energy. This process is used in some forms of propulsion, including maglev trains and MHD generators.

In summary, magnetic energy can be transformed into kinetic energy through the interaction of a magnetic field with a conductor, an electric current, or a fluid, which creates a force that can move an object, thus transforming the magnetic energy into kinetic energy.