A truck weighs 25,000 n, and its tires are inflated to a pressure of 200 kpa. what is the total area of the truck’s tires in contact with the road?

Answer:

D. It decreases

Explanation:

The pressurized cabin of an airplane flying at high altitude is an example of a controlled environment. The air pressure outside an aircraft at high altitude is lower than that at ground level, and the temperature is also extremely low.

Without a pressurized cabin, passengers and crew would suffer from the lack of oxygen and atmospheric pressure, which could result in hypoxia and other serious medical conditions. To prevent this, aircraft are designed with a pressurized cabin that provides a controlled environment with a comfortable temperature and normal atmospheric pressure, similar to what we experience at ground level. The cabin is pressurized by compressing air from the engines and mixing it with fresh air from outside the aircraft, which is then distributed throughout the cabin to maintain a safe and comfortable environment for passengers and crew.

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A freely falling observer  is equivalent to an inertial observer who experiences no acceleration according to the equivalence principle (option B)

The equivalence principle establishes that the gravitational force encountered in a localized region is indistinguishable from the pseudo-force perceived by an observer situated within a non-inertial (accelerated) frame of reference.

Consequently, an observer in free fall within a gravitational field undergoes no discernible acceleration, mirroring the experience of an inertial observer.

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Answer:

Explanation:

Wave speed = distance between two successive maxima / time for eight maxima to pass = 0.548 m / 11.4 s = 0.048 m/s

Answer: Deforestation fires, Lowers the amount of oxygen in the atmosphere.

Explanation:

In a lot of places they will cut down trees with heavy machinery which produce a lot of gases such as Carbon Monoxide, now in little scale thats okay. However many places do it to such a scale that there is almost 200 forest fires a day. Each fire lowers the amount of trees but increases air pollution.  

Answer:

2.5 Hz

Explanation:

3.0m/s / 1.2 m=2.5 1/s=2/5 Hz

The frequency of a wave with speed of 3.0 m/s and has a wavelength of 1.2m is 2.5 Hz.

The frequency of a wave is the number of cycles per second.

Given the wavelength is 1.2 m and speed v =3.0m/s, then the frequency of the wave is

v =fλ

f = 3 / 1.2

f = 2.5 Hz

Thus, the frequency of the wave is 2.5 Hz.

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Answer:

a = 5.33 [m/s²]

Explanation:

To solve this problem we must use Newton's second law which tells us that the sum of the forces acting on a body is equal to the product of mass by acceleration.

ΣF = m*a

where:

F = force = 400 [N]

m = mass = 75 [kg]

a = F/m

a = 400/75

a = 5.33 [m/s²]

Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{6}{12} = \frac{1}{2} \\ \)

We have the final answer as

Hope this helps you

m = f/a

6 / 12 = 0.5

answer - 0.5

The moment of inertia of an object does not depend on the kinematics of the object, such as speed or acceleration.

Kinematics is a subfield of physics, developed in classical mechanics, that describes the motion of points, bodies, and systems of bodies without considering the forces that cause them to move.

The moment of inertia is a measure of an object's resistance to rotational motion, and it is affected by the distribution of mass within the object.

The moment of inertia is a property of an object that describes its resistance to rotational motion, and it depends on the mass distribution and the axis of rotation.

It is independent of the kinematic factors like speed or acceleration, which describe the motion of the object.

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Answer:

81.81 kg

Explanation:

\(m_1\) = Mass of person = 78.4 kg

\(m_2\) = Mass of canister

\(u_1\) = Initial velocity of person = 0

\(u_2\) = Initial velocity of canister = 3.5 m/s

\(v_1\) = Final velocity of person = 2.4 m/s

\(v_2\) = Final velocity of canister = 1.2 m/s

The momentum balance in the system is given by

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\Rightarrow 78.4\times 0+m_2\times 3.5=78.4\times 2.4+m_2\times 1.2\\\Rightarrow m_2=\dfrac{78.4\times 2.4}{3.5-1.2}\\\Rightarrow m_2=81.81\ \text{kg}\)

Mass of the canister is 81.81 kg.

Answer:

a=m/f is not an equation under newton's second law

Explanation:

newton's second law of motion is represented using: f=ma

where a=v-u/t

therefore it becomes,f=m(v-u)/t

from f=ma,

a will become f/m,

m will become f/a

Out of the given options, only "Blown car tire" would be considered an emergency fund expense.

An emergency fund expense is an unforeseen and urgent cost that requires immediate attention and cannot be easily covered by one's regular income or savings.

Examples of emergency fund expenses may include unexpected car repairs, medical bills, or sudden job loss. The purpose of an emergency fund is to provide a financial cushion that can help cover these types of expenses, allowing individuals to manage unexpected financial shocks without having to resort to high-interest debt or deplete their long-term savings.

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E-ink technology is based on microscopic particles called microcapsules that contain charged particles suspended in a clear fluid. These microcapsules are placed between two layers of transparent electrodes. When a positive or negative electrical charge is applied to the electrodes, it causes the charged particles within the microcapsules to move accordingly.

In its default state, the charged particles are dispersed evenly, making the microcapsules appear light or white. When an electric field is applied, the particles move, causing the microcapsules to change color and become darker or black.

The key advantage of e-ink displays is that they do not emit light themselves. Instead, they rely on external light sources to illuminate the display. When ambient light, such as natural light or room lighting, falls on the surface of the e-ink display, it reflects off the display just like it would off a piece of paper. This reflection of light gives e-ink displays a similar appearance to ink on paper, making them easy to read in different lighting conditions.

This reflective property of e-ink displays offers several benefits:

1. Reduced eye strain: Unlike backlit displays that emit light directly into the eyes, e-ink displays reflect ambient light, resulting in less eye fatigue and strain during extended reading sessions.

2. Outdoor readability: E-ink displays perform exceptionally well in bright outdoor environments because the ambient light can enhance the readability of the display, similar to how printed text on paper is easily readable outdoors.

3. High contrast and readability: The absence of a backlight and the reflection of ambient light contribute to high contrast and readability, allowing for clear and crisp text and images.

4. Power efficiency: E-ink displays require minimal power to maintain an image. Once an image is displayed on an e-ink screen, it consumes power only during the transition to a new image. This efficiency allows devices with e-ink displays, such as e-readers, to have long battery life.

Overall, the use of e-ink technology provides a display experience that closely resembles reading from printed paper. The reflective nature of e-ink displays, combined with their low power consumption and high readability, has made them popular in e-readers, digital signage, and other applications where a paper-like reading experience is desired.

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Answer:

The atomic number of phosphorus is 15.

Explanation:

It’s found after Si(Silicon) and before S(sulphur)

The time taken to accelerate from 15 m/s to 21 m/s by a rate of 3 m/s is 2 seconds. Then, the distance travelled by the motorcyclist while accelerating is 36 m.

Acceleration is the rate of change in velocity of an object. Like velocity, it is a vector quantity. As the magnitude or direction or both of the velocity changes the object is said to have an acceleration.

Given v1 = 15 m/s

v2 = 21 m/s

a = 3 m/s²

then t = v2- v1/ a

t = 21 m/s - 15 m/s /3 m/s² = 2 seconds.

Now, the distance travelled while accelerating is calculated as follows:

s = v1 t + 1/2 at²

  = 15 m/s × 1/2 3m/s² × 2 s = 36 m

Therefore, the motorcyclist will travel up to a distance of 36 m.

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Green and blue are the colors of light does red paint absorb.

Hence option A is correct.

Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.

An object appears to be a red cause it absorbs green and blue light and emit red light. That is what red paint does.

hence option A is correct.

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The kinetic energy of the ice when it reaches the ground is 1176 J, and its speed is approximately 3.23 m/s.

To find the kinetic energy of the ice when it reaches the ground, use the equation:

Kinetic Energy (KE) = 1/2 × mass × velocity²

Given:

Mass (m) = 15.0 kg

Height (h) = 8.00 m

To calculate the potential energy of the ice at the starting position, use the equation:

Potential Energy (PE) = mass × gravity × height

where gravity (g) = approximately 9.8 m/s².

PE = 15.0 kg × 9.8 m/s² × 8.00 m

= 1176 J

Since there is no air resistance, all the potential energy is converted into kinetic energy when the ice reaches the ground. Therefore, the kinetic energy is equal to the potential energy:

KE = 1176 J

To find the speed of the ice when it reaches the ground, use the equation:

Potential Energy (PE) = Kinetic Energy (KE)

PE = 1/2 × mass × velocity²

1176 J = 1/2 × 15.0 kg × velocity²

Rearranging the equation to solve for velocity:

velocity² = (1176 J × 2) / (15.0 kg)

velocity² = 156.8 J / 15.0 kg

velocity² = 10.45 m²/s²

Taking the square root of both sides to solve for velocity:

velocity = √(10.45 m²/s²)

velocity ≈ 3.23 m/s

Therefore, the kinetic energy of the ice when it reaches the ground is 1176 J, and its speed is approximately 3.23 m/s.

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Answer:

d.solid to liquid cause they were once on a fixed and started to slide.liquid particles slide along a container so it is a solid to liquid

Answer: B

Explanation: just did it on a p e x

Answer:

11000 J

Explanation:

Apply the formula: K = 1/2.m.v²

K = 1/2.55.20²

K = 1/2.55.400

K = 55.200

K = 11000 Joules

A). To move the bar to the right with a constant speed of 6.00 m/s, we need to find the force required. The force required is the force of the magnetic field that acts on the bar. The power dissipated in the resistor is 6.98 W.

This force is given by the formula: F = BILsinθwhere,F is the force B is the magnetic field I is the current L is the length of the conductorθ is the angle between the magnetic field and the current direction Now, the current in the bar is given by: I = V/R where, V is the voltage applied across the resistor R is the resistance of the resistor Given, V = BLV/Rsinθwhere,L = 1.6 m B = 2.20 T, and R = 4.00 ?θ = 90° = π/2 radians So, V = 2.20 × 1.6 × 6.00/4.00  = 5.28 V The current in the circuit is, I = V/R = 5.28/4.00 = 1.32 A  

Therefore, the force required is: F = BILsinθ = 2.20 × 1.6 × 1.32 × 1 = 4.3872 N(b) The power dissipated in the resistor is given by: P = VI where, V is the voltage applied across the resistor I is the current in the circuit From the above calculations, V = 5.28 VI = 1.32 AP = VI = 5.28 × 1.32 = 6.98 W

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Explanation:

The forces that act on the cart include:

Force of gravity (weight of the cart and books)

Normal force (force exerted by the floor on the cart)

Force of friction (opposes the motion of the cart)

Action:  The man jumps from a boat, he exerts some force on the boat which causes the boat to move backward.

Reaction: An equal force is exerted by the boat on the man which helps the man to jump out of the boat.

According to Newton's third law of motion,

For every action, there is an equal and opposite reaction. This means that there is a reaction for every force acting on a body

Newton's second law of motion,

The rate of change of momentum of a body is directly proportional to the applied force.

When the boat is at rest, its initial momentum is zero. When the man jumps out of the boat, he applies force on the boat in a backward direction due to which the boat starts to move in a backward direction due to the conservation of linear momentum. An equal force is exerted by the boat on the man which helps the man to jump out of the boat. Since there is no external force, there is no change in the linear momentum.

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When central maximum is illuminated by white light, then six(6) full spectral orders can be seen on each side.

For calculating this we need to know the wavelength of white light when visible light wavelength is in range of 400 to 700nm.

Now, we know that dsinθ=mλ

where d is the distance between slits,

λ is the wavelength

sinθ is the angle made by light with medium

and m is the ratio of wavelength

Firstly, we assign sinθ=1

=>m=d/λ----------eq1

For finding d, we know that d=1/granting

=>d=1/(400×10⁹)

=>d=2.5 ˣ 10⁻⁶m

Now, we know that for finding m we need to put value in eq1

At 400nm wavelength, we get

=>m=2.5 ˣ 10⁻⁶m/400ˣ10⁹m

=>m=6.25

At 700nm wavelength, we get

=>m=2.5 ˣ 10⁻⁶m/700ˣ10⁹m

=>m=3.17

Now, we know that fourth maxima value is 3.17 and seventh maxima value is 6.25

It means there are three maxima in between seventh and fourth maxima.

Total number of maxima on both sides =3ˣ2=6

Hence,6 full spectral orders can be seen.

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If the astronaut's angular momentum (H2) is greater than her initial angular momentum (H1), we can assume that something happened to change her angular momentum. Angular momentum is a property of rotating objects and is conserved in the absence of any external torques.

There are a few possible scenarios that could have led to an increase in angular momentum:

1. The astronaut could have extended her arms or legs outward while rotating. This action would increase her moment of inertia, which is a measure of an object's resistance to changes in rotational motion. By increasing her moment of inertia, the astronaut can increase her angular momentum without changing her angular velocity.

2. The astronaut could have changed her rotational speed while keeping her moment of inertia constant. For example, she could have pulled in her limbs closer to her body, effectively reducing her moment of inertia. According to the conservation of angular momentum, a decrease in moment of inertia would result in an increase in rotational speed to maintain the same angular momentum.

3. The astronaut could have experienced an external torque that acted on her body, causing a change in her angular momentum. For instance, if the astronaut used a propellant to push herself off from a surface, the force exerted would create a torque on her body, changing her angular momentum.

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The value of the resistance of R₂, given that the total resistance in the circuit is 15 ohms is 5 ohms (option D)

The following data were obtained from the question:

Total resistance in series connection is given by the following formula:

R = R₁ + R₂ + R₃ + ... + Rₙ

Inputting the various parameters given, we can obtain the resistance of R₂ as follow:

R = R₁ + R₂

15 = 10 + R₂

Collect like terms

R₂ = 15 - 10

R₂ = 5 ohms

Thus, we can conclude from the above calculation that the resistance of R₂ is 5 ohms (option D)

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Complete question:

See attached photo

The California sea lions communicate  is  option C: 0.375 to 3 meters.

To calculate the approximate wavelengths of sound with which the California sea lions communicate, we can use the formula:

Wavelength = Speed of Sound / Frequency

Given:

Speed of Sound in Sea Water = 1,500 m/s

Frequency Range = 500 Hz to 4,000 Hz

For the lower frequency of 500 Hz:

Wavelength = 1,500 m/s / 500 Hz = 3 meters

For the higher frequency of 4,000 Hz:

Wavelength = 1,500 m/s / 4,000 Hz = 0.375 meters

Therefore, the approximate wavelengths of sound with which the California sea lions communicate are approximately 0.375 to 3 meters.

So, the correct answer is option C: 0.375 to 3 meters.

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On a sunny day, the rooftop solar panel generates an EMF of 17 V and produces a power output of 60 W. The current flowing through the circuit is approximately 3.53 A.

On a sunny day, a rooftop solar panel delivers 60 W of power to the house at an EMF (electromotive force) of 17 V. The power delivered by the solar panel can be calculated using the equation P = VI, where P is power, V is voltage, and I is current. Given that the power is 60 W and the voltage is 17 V, we can rearrange the equation to solve for current: I = P/V.

Plugging in the given values, we get I = 60 W / 17 V. By performing the division, we identify that the current produced by the solar panel is approximately 3.53 A (Amperes).

The solar panel's voltage of 17 V represents the electromotive force or potential difference it generates. This voltage is essential for driving the flow of electric current through the circuit. The power output of 60 W represents the rate at which the solar panel delivers energy to the house.

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When workers organize themselves so they can collectively negotiate with employers as a group over wages and working conditions, it is known as a labor union.

A labor union, also referred to as a trade union, is an organization formed by workers to collectively represent their interests in negotiations with employers. By joining forces, workers can leverage their collective bargaining power to advocate for better wages, improved working conditions, and other employment-related benefits. Labor unions often engage in negotiations, strikes, or other forms of collective action to achieve their objectives. The purpose of a labor union is to protect the rights and welfare of workers and to ensure a fair and equitable relationship between employers and employees in the workplace.

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b. We can Connect 3 cells in series to 3 lamps in parallel and place an ammeter on the circuit to measure the current through one of the lamps.

The image is attached.

c. In this  connection, we creates a series connection where the current flowing through each component is the same.

the two cells' positive and negative terminals must be connected in order to complete the circuit. As a result, a parallel connection is formed where the overall current capacity rises while the voltage across each cell stays the same.

The positive terminal of the first light would be connected to the negative terminal of the second lamp in order to link the two lamps and a motor in series. The second lamp's positive terminal would then be connected to one of the motor's terminals. Finally, you would attach the other motor terminal to the first lamp's negative terminal.

This establishes a series connection in which each component receives the same amount of current.

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