A 17,000-kg airplane lands with a speed of 82 m/s on a stationary aircraft carrier deck that is 115 m long. find the work done by nonconservative forces in stopping the plane

Answer:

Part a)

[tex]v_f = 6.5 m/s[/tex]

Part b)

[tex]t = 5 seconds[/tex]

Explanation:

Part a)

As we know that

[tex]v_f = v_i + at[/tex]

here we know that

[tex]v_i = 3 m/s[/tex]

[tex]a = 0.5 m/s^2[/tex]

[tex]t = 7.0 s[/tex]

so we will have

[tex]v_f = 3 + (0.5)(7.0)[/tex]

[tex]v_f = 6.5 m/s[/tex]

Part b)

if finally the snowmobile comes to rest

So here we can say that

[tex]v_f = 0[/tex]

[tex]v_i = 3.0 m/s[/tex]

[tex]a = -0.60 m/s^2[/tex]

so now we have

[tex]v_f = v_i + at[/tex]

[tex]0 = 3.0 - (0.60)t[/tex]

[tex]t = 5 s[/tex]

Final answer:

To find the number of photons, we first calculate the energy of one photon using Planck's equation and then divide the total energy by this value. With the given wavelength, the energy per photon is 2.03 × 10⁻¹⁹ J, leading to approximately 1.23 × 10² photons for the total energy emitted.

Explanation:

To calculate the number of photons emitted at a given wavelength, we use the energy of a single photon and divide the total energy by this value. The energy (E) of a photon is related to its wavelength (λ) by the equation E = hc/λ, where h is Planck's constant (6.63 × 10⁻³⁴ J·s) and c is the speed of light (3.00 × 10⁸ m/s). Given a wavelength of 9.8 × 10⁻⁷ m, the energy per photon can be calculated. Then, the total number of photons is total energy / energy per photon.

First, we find the energy of one photon:

Next, we use the total energy to find the number of photons:

Final answer:

To find the number of photons that correspond to 2.5 × 10⁻¹⁷ J of ultraviolet light at a wavelength of 9.8 × 10⁻· m, first calculate the energy per photon using Planck's formula, then divide the total energy by this value, resulting in approximately 1.23 × 10² photons.

Explanation:

To calculate the number of photons corresponding to 2.5 × 10⁻¹⁷ J of ultraviolet light at a wavelength of 9.8 × 10⁻· m, we must first determine the energy per photon using the formula E = hc/λ, where E is the photon energy, h is Planck's constant (6.626 × 10⁻4 J·s), c is the speed of light in a vacuum (3 × 10⁸ m/s), and λ is the wavelength of the light.

First, we calculate the energy per photon:

E = (6.626 × 10⁻4 J·s)(3 × 10⁸ m/s) / (9.8 × 10⁻· m) ≈ 2.026 × 10⁻ J per photon.

Now, we find the number of photons by dividing the total energy by the energy per photon:

Number of photons = Total energy / Energy per photon = (2.5 × 10⁻ J) / (2.026 × 10⁻ J/photon) ≈ 1.23 × 10² photons.

In an experiment performed in a space station, a force of 60 Newtons  causes an object to have an acceleration equal to 4 meters/second², then the mass of the object would be 15 kilograms,

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

F = mass ×acceleration

As given in the problem In an experiment performed in a space station, a force of 60 Newtons  causes an object to have an acceleration equal to 4 meters/second²,

mass = force /acceleration

         = 60 Newtons/ 4 meters/second²

         = 15 kilograms

Thus, the mass of the object would be 15 kilograms

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The correct answer to the question is : By increasing the pressure.

EXPLANATION:

Before answering this question, first we have to understand Gay lussac's law.

As per Gay lussac's law, the pressure of a gas increases or decreases by 1/273 th of its pressure at zero degree celsius; for every 1 degree celsius rise or fall of temperature at constant volume

In a simple way, the pressure is directly proportional to absolute temperature.

Mathematically P ∝ T.       [ P = pressure and T = temperature]

Hence, increase in pressure at constant volume may increase its temperature.

Final answer:

The acceleration of the penny decreases as the air resistance increases because the net force acting on it reduces until it reaches terminal velocity, where acceleration becomes zero. So the answer to the question is a.

Explanation:

When a penny is dropped from an observation deck of a skyscraper, initially it accelerates due to gravity. As it gains speed, the force of air resistance increases. This air resistance force acts in the opposite direction to the penny's motion, therefore, as the air resistance increases, it will reduce the net force acting on the penny. According to Newton's second law, acceleration results from forces acting on an object divided by its mass. When the upward air resistance force equals the downward gravitational force, the net force becomes zero, and the penny no longer accelerates and reaches terminal velocity.

Therefore, as the air resistance increases while the penny falls, the acceleration of the penny decreases until it hits terminal velocity, where the acceleration will be zero. So the answer to the question is a. The acceleration decreases.

Final answer:

The half-life of a radioactive isotope that decreases to one-fourth its original amount in 100 years is 50 years, as this duration represents two half-lives.

Explanation:

The half-life of a radioactive isotope is the time required for half the atoms of a radioactive sample to decay. If a radioactive isotope decreases to one-fourth of its original amount after 100 years, it means that two half-lives have passed (since one half-life leaves us with half the original amount, and another half-life would then leave us with one-fourth). Therefore, the half-life is 50 years. This exemplifies an exponential decay process, typical for radioactive substances.

The electric scoreboard was invented by George A. Baird in 1908.

The electric scoreboard invention was a significant advancement in the way sports scores were displayed during games, making it easier for spectators to follow the progress of the game in real-time.

Answer: D

Explanation: I took the test

A reformed land policy for these living in Virgina is not an outcome of Bacon's rebellion. Hence, option D is correct.

A local conflict with the Doeg Indians on the Potomac River served as the catalyst for Bacon's Rebellion, which was waged between 1676 and 1677. The Indians started assaulting the Virginia frontier after being pursued north by Virginia militiamen, who also assaulted the Susquehannock, who were otherwise uninvolved.

The General Assembly was persuaded to approve a scheme by the governor, Sir William Berkeley, that would have isolated the Susquehannock while enlisting Indian allies on Virginia's side. Others saw the Susquehannock War as a chance to launch a general Indian war that would result in the capture of Indian slaves and lands, as well as the expression of widespread anti-Indian feeling.

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The orbital period of a satellite depends on the radius of its orbit and the acceleration due to gravity. The mass of the satellite does not affect its orbital period. The calculation assumes a circular orbit and a uniform gravitational field.

The orbital period of an artificial satellite is the time it takes the satellite to complete one full orbit around the Earth. Using the given acceleration due to gravity (9.00 m/s2) and the formula for the period of an orbit, we can solve for the satellite's orbital period. The formula for the period (T) of an orbit is derived from the formula for the speed of an orbit: V_orbit = 2πr/T. This formula shows that the orbital speed is equal to the circumference of the orbit divided by the orbital period. By substituting this into the centripetal acceleration equation (a = V²/r), it can be rearranged to get the period of orbit.

The mass is cancelled out in these equations, so the mass of the satellite does not affect the orbital period or speed. Therefore, any satellite at the same altitude will have the same orbital period, regardless of its mass.

A crucial point to remember is that this calculation assumes a circular orbit, which simplifies the calculation. In reality, orbits may not always be perfectly circular. This also ignores the effect of the Earth's nonuniform gravitational field and assumes that the only force acting on the satellite is the Earth's gravity.

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The distance between the two cars can be expressed as a function of time using the Pythagorean theorem. At t = 0, the cars are 2 km apart, and as time progresses, their distances increase.

The distance between the two cars can be expressed as a function of time using the Pythagorean theorem. Let's consider the time t as the independent variable. At t = 0, both cars leave the intersection, so the distance between them is initially given by:

[tex]d(0) = \sqrt{((2 km)^2 + (0 km)^2)} = \sqrt{(4 km^2)} = 2 km[/tex]

As time progresses, the car headed south travels at a speed of 40 mph, which means its distance from the starting point increases by 40t miles. Similarly, the car headed west travels at a speed of 30 mph, increasing its distance from the starting point by 30t miles.

Using the Pythagorean theorem again, we can find the distance d between the two cars as a function of time:

[tex]d(t) = \sqrt{((40t)^2 + (30t)^2)[/tex]

Final answer:

The final speed of the car is 8.16 m/s and the net horizontal force exerted on the car is 2976.8 N.

Explanation:

To find the final speed of the car, we can use the work-energy principle. The work done on an object is equal to the change in its kinetic energy. Since the car starts from rest, its initial kinetic energy is zero, and the work done on the car is equal to its final kinetic energy.

Given that the car requires 5.3 kJ of work and has a mass of 2.44 x 10^3 kg, we can calculate the final kinetic energy using the equation:

Kinetic Energy = (1/2) * mass * velocity^2

By rearranging the equation, we can solve for the final velocity:

velocity = sqrt(2 * work / mass)

Substituting the values, we get:

velocity = sqrt(2 * 5300 / 2440) = 8.16 m/s

To find the net horizontal force exerted on the car, we can use Newton's second law, which states that force is equal to mass times acceleration. Since there is no vertical motion, the net force in the horizontal direction is equal to the mass times the acceleration.

Given that the mass of the car is 2.44 x 10^3 kg and the final velocity is 8.16 m/s, we can calculate the net horizontal force using the equation:

Force = mass * acceleration

Since the car starts from rest, the initial velocity is zero. Therefore, the acceleration is equal to the final velocity divided by the time taken to reach the final velocity. Given that the car moves 27.4 m, we can calculate the acceleration using the equation:

acceleration = velocity^2 / (2 * distance)

Substituting the values, we get:

acceleration = (8.16^2) / (2 * 27.4) = 1.22 m/s^2

Finally, we can calculate the net horizontal force:

Force = (2.44 x 10^3) * 1.22 = 2976.8 N

Answer:

B

Explanation:

As altitude rises, air pressure drops. In other words, if the indicated altitude is high, the air pressure is low. This happens for two reasons. The first reason is gravity. Earth's gravity pulls air as close to the surface as possible. The second reason is density. As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude.

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Answer:

the answer is A) Wealthy Americans receive adequate medical care.

Explanation:

I got a 100 on the test on edge!

Social status can have an influence on access to healthcare, but it does not directly determine whether individuals receive adequate medical care. The most appropriate answer is none of the above.

The relationship between social status and healthcare is complex and multifaceted. Factors such as income, education, employment, insurance coverage, and systemic barriers can impact access to healthcare.

While individuals with higher social status or greater wealth may have more resources and options for healthcare, it does not guarantee that they will receive adequate or optimal medical care.

Conversely, individuals with lower social status or limited financial means may face barriers to accessing quality healthcare, but it does not mean they will not receive any medical care at all. The ability to receive adequate medical care is influenced by various individual and systemic factors, and it is not solely determined by social status.

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The answer is:

A. They can be formed into wires.

B.They are shiny.

D. They are good conductors

E.can be easily shaped by hammering or pounding.

The explanation:

Let's see the characteristics of the most metals:

1) the most metals can be hit by a hammer and form a thin sheets without breaking and this called malleability.

for example: Aluminium and copper

2) They can form into a very thin wires and this called ductility

for example: silvar , Aluminium and copper.

3) The metal can conduct the heat and the electricity very easy and quick, this mean that the meals are good conductor for the heat and electricity.

4)The metals like gold can be used at jewellery because it is very shiny.

5) and answer C is wrong because most metals are solid at room temperature.

Answer:

Option A, B, D and E are the characteristics of Metal

Explanation:

Some of the common characteristics of most of the metals are -

a) Most of the metal have lustrous surface which means they glitter in the presence of light for example - Iron, copper etc.

b) All metals are malleable which means they can be molded into different shape on beating for example copper can be converted into copper wire, jug, plates etc.

c) All metals are good carrier of charge and thus they are good conductors. These metals have valence shells electron which are free to move with a small force. Good metal conductors are copper , iron etc

d) Most of the metal are solid at room temperature.

The rock's time of flight is approximately 2.85 seconds. This is determined by solving a quadratic equation derived from the vertical motion kinematic equation. The initial vertical velocity component and gravitational acceleration are key to finding the solution.

               V₀y = 12 m/s * sin(42°)

               Solving for V₀y, we get approximately 8.02 m/s.

               y = V₀yt + 0.5 * a * t²

where y is the displacement (−9.5 m, since the rock falls below its original level), a is the acceleration due to gravity (−9.8 m/s²), and V₀y is the initial vertical velocity.

               -9.5 = 8.02t - 4.9t²

               4.9t²- 8.02t - 9.5 = 0

               [tex]t= \frac{8.02 \pm \\\sqrt{(8.02^{2} - 4(4.9)(-9.5))}} {(2(4.9))}[/tex]

               t ≈ 2.85 s

Therefore, the rock's time of flight is approximately 2.85 seconds.

The force exerted is constant because the mass of the rocket decreases as fuel is burned, so the acceleration increases.

The relationship between force, mass, and acceleration is given by Newton's second law and stated mathematically as follows:

As the rocket accelerates, fuel is burnt and the mass of the rocket reduces. Thus, the force exerted remains constant.

Therefore, the mass of the rocket decreases as fuel is burned, so the acceleration increases.

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Answer:

b

Explanation:

Energy that costs more to harness than it provides indicates an energy deficit in the transformation and conversion process. Renewable resources can potentially become non-renewable if their consumption surpasses replenishment. The use of renewable resources is not ubiquitous due to cost, geographical, and technological limitations.

When a form of energy takes more energy to harness than it provides, it means that the energy input required to extract or convert the energy is greater than the energy output made available for use. This is a significant factor in evaluating the efficiency of energy sources and plays into the concept of energy transformation and conversion.

Renewable resources, by definition, are replenished naturally over short time scales relative to the lifetime of human civilization. However, the ability to renew does not equate to infinite availability if consumption rates surpass replenishing rates. Thus, although inherently renewable, they may de facto become non-renewable.

While renewable energy resources offer numerous benefits, including lower emissions and a reduced dependence on fossil fuels, they are not used for everything due to several factors. These include cost, geographical limitations, and technology constraints. For instance, the initial costs of renewable energy systems can be high, and not all locations receive enough sunlight or wind to be effective. Additionally, technology has not advanced to a level where renewable energy can fully replace non-renewable sources in all uses.

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Harnessing some energy sources can be inefficient if the energy input exceeds the output. Renewable resources can sometimes become non-renewable if consumed faster than they are replenished. Challenges like intermittency, energy density, infrastructure costs, and location dependency limit the use of renewable energy for all purposes.

When it is said that a form of energy might take more energy to harness than it provides, it means the energy input required to extract, process, and deliver the energy is greater than the usable energy output gained. This scenario is inefficient and often not sustainable.

Renewable resources are typically those that can be naturally replenished within a human lifespan. Examples include solar, wind, and biomass energy. However, they can become non-renewable if their rate of consumption exceeds the rate at which they are replenished, or if environmental conditions change drastically, making them less viable.

There are several reasons why renewable energy sources are not used for all energy needs:

While renewable resources offer many advantages, including lower environmental impact and sustainability, technical and logistical challenges must be addressed for them to replace non-renewable sources completely.