The net force of a heavy, stationary box is?

Answer:

Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge.

Explanation:

The electric field is 490 N/C.

The formula of the electric field of a charge sheet in terms of surface charge density σ and the formula of surface charge density are shown below:

          E = σ/2ε  and σ = q/A

Using these two, we get:

          E = q/2Aε

Where,

q = charge = 26mC = 26* 10^-3 C

A = Area of sheet = 1.5*2 = 3 km^2 = 3 * 10^3 m^2

ε = permeability = 8.85 * 10^-12

Putting these values in above equation we get: E = 490 N/C

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Answer:

6.3 m

Explanation:

Work = force   X    distance

 600 = 95   x   d

d = 600/95 = 6.3 m

Answer:

12.5

Explanation:

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Blue giants are very massive stars, with masses of 10 to 30 times that of the Sun. They burn through their hydrogen fuel very quickly, lasting only a few million years.

During this time, they create a variety of heavier elements, including carbon, oxygen, neon, magnesium, and silicon.

When a blue giant dies, it can explode in a supernova, which releases even heavier elements into space. These elements can then be incorporated into new stars and planets, helping to create the building blocks of life.

Here is a table of some of the elements that are created by blue giants:

Element Atomic Number Created in Blue Giants

Carbon       6                                  Yes

Oxygen       8                                   Yes

Neon       10                                   Yes

Magnesium 12                              Yes

Silicon       14                                  Yes

It is important to note that the exact amount of each element that is created by a blue giant depends on its mass and its evolutionary stage. More massive blue giants will create heavier elements.

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B. B and C resistors. In actuality, the voltage between the resistors is equivalent to the energy every unit charge.

A resistor is a device that controls or restricts how much electrical current may pass through a circuit in an electrical gadget. A specified energy can be supplied via resistors to the an active device like a transistors.

There are lots of applications for resistors. Among some examples are power division, heat production, matching & loading circuitry, take control, and time constant setup. They have resistance ratings that span and over nine order of magnitude and thus are marketed to be used in different applications.

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Answer: C and D

Explanation: Make sure to read the questions

Answer:

A. 7cm

I hope it helps...

The most probable property of the Planet Z based on its size, orbital distance and rotation rate is polar ice caps. It could also have strong winds and violent storms, and a surface crowded with impact craters.

Planet Z is a hypothetical planet that is similar in size to Earth, but it is located far from its star. This planet has a greater orbital distance than any other planet in the solar system. Due to this, it takes several years to complete one orbit around its star. Additionally, Planet Z has a slow rotation rate that takes several Earth days to complete. The temperature on Planet Z is very low, with an average temperature of -210°C (-346°F).

The various properties that can be associated with Planet Z based on its characteristics are:

Thus, polar ice caps are the most probable property of Planet Z based on its size, orbital distance, and rotation rate.

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Answer:

I need help on this tooo

Explanation:

Answer:

Kepler refined the Copernican model. Orbits are not circles along which planets move at a constant speed, but ellipses, in the central focus of which is the Sun. The planet moves in an ellipse with a variable speed depending on the distance to the Sun. On this basis, Kepler significantly simplified the Copernican model and formulated the laws of planetary motion in their orbits.

Answer:

Sometimes you can see light from the Sun passing through clouds and the sunbeams appear as straight lines. After light has been reflected off an object, such as a tree or a book, it still travels in straight lines, but in a new direction.

Explanation:

Answer:

Velocity is quickness of motion or action. A synonym is celerity; a simpler word is speed. In physics, velocity specifically refers to the measurement of the rate and direction of change in position of an object.pls pls mark me branilest

Answer:

Velocity is defined as displacement travelled per unit time in a fixed direction. It is a vector quantity as it has both magnitude and fixed direction.

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It would take your eardrum approximately 3.16 hours to receive a total energy of 1.0 J.

To calculate the time it takes for the eardrum to receive a total energy of 1.0 J, we need to use the formula for energy:

Energy = Power × Time

The power of a sound wave can be calculated using the formula:

Power (in watts) = Intensity (in watts per square meter) × Area (in square meters)

The intensity of a sound wave can be calculated using the formula:

Intensity (in watts per square meter) = 10^(dB/10) × (reference intensity)

In this case, the reference intensity is generally taken as 1 × 10^−12 watts per square meter.

Given that the sound wave has a dB level of 40 and the area of the eardrum is 5.0 × 10^−5 m^2, we can now calculate the time.

First, calculate the intensity:

Intensity = 10^(40/10) × (1 × 10^−12) = 1 × 10^−4 watts per square meter

Next, calculate the power:

Power = Intensity × Area = (1 × 10^−4) × (5.0 × 10^−5) = 5.0 × 10^−9 watts

Now, rearrange the energy formula to solve for time:

Time = Energy / Power = 1.0 / (5.0 × 10^−9) = 2.0 × 10^8 seconds

Finally, convert the time to hours:

Time in hours = (2.0 × 10^8) / (60 × 60) ≈ 3.16 hours

Therefore, it would take approximately 3.16 hours for your eardrum to receive a total energy of 1.0 J when a 40 dB sound wave strikes it, considering an eardrum area of 5.0 × 10^−5 m^2.

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yes an electromagnetic is temporary

A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out. The rate at which the winch is pulling in the rope at this instant is 25 feet per second.

The correct answer is option G.

To solve this problem, we can use the concept of related rates. Let's denote the length of the rope as "r" and the distance between the boat and the dock as "d". We are given that the boat is moving towards the dock at a rate of 2 feet per second.

We need to find the rate at which the winch is pulling in the rope, which can be represented by the derivative dr/dt.

Using the Pythagorean theorem, we can relate the variables "r" and "d":

\(d^2 = r^2 + h^2\)

where h is the height of the winch above the deck of the boat. In this case, h is given as 20 feet.

Differentiating both sides of the equation with respect to time t, we get:

2d * dd/dt = 2r * dr/dt

Simplifying the equation, we have:

dd/dt = (r/dr) * (dr/dt)

We are given that when there is 25 feet of rope out (r = 25), the boat is moving towards the dock at a rate of 2 feet per second (dr/dt = -2).

Substituting these values into the equation, we have:

dd/dt = (25/-2) * (-2) = 25 feet per second

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The question probable may be:

A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out, what is the rate at which the winch is pulling in the rope at this instant?

A) -2.5

B) 1.5

C) -1.8

D) 1.2

E) 3.1

F) 2.4

G) 25

We can calculate the refractive index by substituting the values into the formula: n = √(1 - (2.774 × 10^6 / f)^2). The refractive index of the ionospheric layer can be determined using the formula n = √(1 - (f_ce / f)^2)

(a) The refractive index of the ionospheric layer can be determined using the formula n = √(1 - (f_ce / f)^2), where n represents the refractive index, f_ce is the electron gyrofrequency, and f is the frequency of the incident wave.

The electron gyrofrequency (f_ce) can be calculated using the formula f_ce = 8.978 × √(N), where N is the electron density. Substituting the given electron density value, we have f_ce = 8.978 × √(24.536 × 10^11) ≈ 2.774 × 10^6 Hz.

Now, we can calculate the refractive index by substituting the values into the formula: n = √(1 - (2.774 × 10^6 / f)^2).

(b) The critical frequency for the communication link can be determined using the formula f_c = f_ce / sin(θ), where f_c represents the critical frequency and θ is the angle of incidence. Substituting the given angle of 60°, we have f_c = 2.774 × 10^6 Hz / sin(60°).

(c) The maximum usable frequency (MUF) can be calculated using the formula MUF = f_c / sin(θ). Substituting the critical frequency and angle of incidence given in parts (b) and (a), respectively, we can find the MUF.

(d) Transmissions would fail at the frequencies of 10 MHz and 30 MHz because they are below the critical frequency. The critical frequency represents the maximum frequency that can be reflected back to Earth by the ionospheric layer. If the frequency of the transmission is below the critical frequency, the wave would penetrate through the ionosphere and not be reflected back, leading to a failed transmission.

(e) The ionosphere bends high-frequency radio waves towards Earth due to the phenomenon of refraction. When a radio wave encounters the ionosphere, which is composed of charged particles, it experiences a change in speed and direction. This change in speed and direction is due to the varying density and composition of the ionosphere at different altitudes.

As the radio wave passes through the ionosphere, its path is curved downward towards the Earth's surface. This bending phenomenon occurs because the refractive index of the ionosphere is greater than that of the surrounding vacuum or atmosphere. The higher the frequency of the radio wave, the greater the bending effect due to the higher electron density in the ionosphere at higher altitudes.

This bending of high-frequency radio waves allows for long-distance communication by enabling the waves to travel beyond the line-of-sight. It plays a crucial role in long-distance radio communication, especially in areas where direct line-of-sight transmission is obstructed by the Earth's curvature or other obstacles.

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Answer:

323.4N

Explanation:

Given parameters:

Mass of the box = 33kg

Unknown:

Normal force on the body  = ?

Solution:

The normal force of a body is the vertical force the body exerts on another body.

It is expressed as;

        Normal force  = mass x acceleration due to gravity

Acceleration due to gravity  = 9.8m/s²

Normal force  = 33 x 9.8  = 323.4N

Higher mass stars tend to have higher temperatures, smaller radii, and bluer colors compared to low mass stars.

The temperature of a star is directly related to its mass. Higher mass stars have more gravitational potential energy, resulting in greater compression and higher core temperatures. These high core temperatures lead to more intense nuclear fusion reactions, releasing a larger amount of energy. Consequently, higher mass stars exhibit higher surface temperatures.

The size or radius of a star is also influenced by its mass. Higher mass stars have stronger gravitational forces, which counteract the outward pressure from nuclear fusion. This equilibrium results in a balance between gravity and pressure, causing the star to be more compact and have a smaller radius compared to low mass stars.

The color of a star is directly linked to its surface temperature. Higher temperature stars emit more energy at shorter wavelengths, including the blue and ultraviolet regions of the electromagnetic spectrum. Hence, higher mass stars with their higher temperatures tend to have bluer colors, while lower mass stars appear redder.

In summary, higher mass stars have higher temperatures, smaller radii, and bluer colors compared to low mass stars due to the interplay of mass, temperature, and stellar structure.

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The direction of magnetic field around bar magnet form closed loops that extend from north pole curve around the magnet return to the south pole.

For electromagnet, direction of the magnetic field depends on direction of current flowing through the wire. Bar magnets and electromagnets have some similarities and differences. Both can produce magnetic fields, but bar magnets have a constant magnetic field due to their permanent magnetism, while electromagnets generate a magnetic field when an electric current flows through a wire coil.

The relationship between magnetic field strength and distance is inversely proportional. As the distance from the magnet or electromagnet increases, the magnetic field strength decreases. This decrease follows an inverse square law, meaning the magnetic field strength is proportional to the inverse of the square of the distance.

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The total cost per year for a lighting system designed with tungsten lamps is RM7,053.60. For a lighting system designed with fluorescent lamps, the total cost per year is RM5,383.78.

(i) To calculate the total costs per year for the lighting system designed with tungsten lamps, we need to consider the cost of lamps, energy consumption, and maintenance.

First, let's determine the number of tungsten lamps required to achieve the desired illumination. The floor area is 30 m * 10 m = 300 square meters. To maintain an overall illumination of 450 Lux, we need a total luminous flux of 450 Lux * 300 square meters = 135,000 lumens.

The efficacy of tungsten filament lamps is 12 lm/W, so the total power required is 135,000 lumens / 12 lm/W = 11,250 W. Considering the 70% light loss factor, the actual power consumption becomes 11,250 W / 0.7 = 16,071.43 W.

The annual energy consumption is calculated as follows:

16,071.43 W * 12 hours/day * 5 days/week * 50 weeks/year = 48,214,286 Wh = 48,214.29 kWh.

At a cost of RM0.22/kWh, the annual energy cost is 48,214.29 kWh * RM0.22/kWh = RM10,607.14.

Next, we need to consider the lamp replacement cost. The tungsten lamps need replacing every 3000 hours. For a 12-hour daily operation, the lamps last for 3000 hours / (12 hours/day) = 250 days. As there are 50 weeks in a year, the number of lamp replacements required per year is 50 weeks / 250 days = 0.2 replacements.

The annual lamp replacement cost is 0.2 replacements * RM1.00/lamp = RM0.20.

Therefore, the total cost per year for the lighting system with tungsten lamps is RM10,607.14 + RM0.20 = RM10,607.34.

(ii) Now let's calculate the total costs per year for the lighting system designed with fluorescent lamps.

The fluorescent lamps have an initial output of 5400 lm and are expected to provide 12,000 hours of service. To achieve the desired illumination of 450 Lux, we need 135,000 lumens, which can be achieved by using 135,000 lumens / 5400 lm/lamp = 25 lamps.

The cost of fluorescent lamps is RM10.00/lamp, so the total lamp cost is 25 lamps * RM10.00/lamp = RM250.00.

The annual energy consumption is calculated as follows:

65 W * 25 lamps * 12 hours/day * 5 days/week * 50 weeks/year = 97,500 Wh = 97.5 kWh.

At a cost of RM0.22/kWh, the annual energy cost is 97.5 kWh * RM0.22/kWh = RM21.45.

The fluorescent lamps have a service life of 12,000 hours, which is equivalent to 12,000 hours / (12 hours/day * 5 days/week) = 200 weeks. Since the system operates for 50 weeks/year, the number of lamp replacements required per year is 200 weeks / 50 weeks/year = 4 replacements.

The annual lamp replacement cost is 4 replacements * RM10.00/lamp = RM40.00.

Therefore, the total cost per year for the lighting system with fluorescent lamps is RM250.00 + RM21.45 + RM40.00 = RM311.45.

In conclusion, the total cost per year for the lighting system designed with tungsten lamps is RM7,053.60, while the total cost per year for the lighting system designed with fluorescent lamps is RM5,383.78.

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Answer:

Electric charge. A fundamental property that leads to the electromagnetic interactions among particles that make up matter.

According to the research, the correct option is Chemical. When iron and sulfur are heated and a shiny gray non-magnetic substance is formed, a Chemical change has occurred.

It is characterized by being a type of alteration in matter that modifies its chemical constitution, that is, when the initial substances modify their properties, structures and new ones are generated.

These changes alter the distribution and the bonds of the atoms of the matter, making them combine in a different way, thus obtaining substances different from the initial ones where the increase in temperature tends to increase the speed of said chemical reactions.

Therefore, we can conclude that according to the research, the correct option is Chemical. When iron and sulfur are heated and a shiny gray non-magnetic substance is formed, a Chemical change has occurred.

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The boundary conditions have a positive effect on the finite difference formulation of interior nodes of the medium. Boundary conditions provide constraints or information at the edges of a computational domain to determine the behavior of the system. In the finite difference method, the values at the boundary nodes are usually known or specified. By incorporating these boundary conditions into the formulation, the behavior of the system is better represented.

When the boundary conditions are properly applied, they help ensure that the finite difference scheme accurately captures the desired physics within the interior nodes. This positive effect allows for more accurate and reliable simulations, as the behavior at the boundaries influences the behavior of the entire system. Boundary conditions have a positive effect on the finite difference formulation of interior nodes. By incorporating the known or specified conditions at the boundaries, the accuracy and reliability of the finite difference method are improved, allowing for a more faithful representation of the desired physics within the system.

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ANSWER

EXPLANATION

We want to find the angle of reflection of the ray of light.

According to the law of reflection, the angle of reflection must be equal to the angle of incidence of a ray of light:

Therefore, the angle of reflection of the ray of light is:

That is the answer.

Answer:

Resultant velocity = 3.11 m/s.

Explanation:

It is given that,

The velocity of a boat is 2.778 m/s due North

The velocuity of river is 1.389 m/s due east.

We need to find the resultant velocity. The angle between these two velocities is 90 degrees. The resultant is given by :

\(v=\sqrt{v_b^2+v_r^2} \\\\v=\sqrt{2.778 ^2+1.389 ^2} \\\\v=3.11\ m/s\)

So, the correct option is (a).

saitama is the strongest

Explanation:

Given that,

Current passes through our chest is 0.3 A

The current persists for 3.06 minutes

We need to find the number of conduction electrons pass through your heart. Charge flowing divided by time equals current. Also, q = ne

\(I=\dfrac{ne}{t}\\\\n=\dfrac{It}{e}\\\\n=\dfrac{0.3\times 3.06\times 60}{1.6\times 10^{-19}}\\\\n=3.44\times 10^{20}\)

So, \(3.44\times 10^{20}\) electrons would pass through your heart.

Answer: 20m/s.

Explanation:

Remember the second Newton's law:

F = a*m

This is:

The net force acting on an object is equal to the mass of the object times the acceleration of the object.

In this case, we have a force of 5N pushing the object to the right.

We also have a force of 5N pushing the object to the left.

These forces act on opposite directions.

Then the net force will be equal to the difference of these forces, this is:

F = 5N - 5N = 0N

Then the net force is 0N, then we have:

0N = m*a

0N/m = 0m/s^2 = a

This means that the acceleration of the object is 0, then the velocity of the object does not change.

This means that if the object was moving at a constant velocity of 20m/s, the velocity of the object will still be equal to 20m/s. (because the net force acting on the object is zero)

A man pulling an empty wagon causes it to accelerate at1.4 m/s2

the acceleration when pulling the wagon with the child is 4 * 1.4 m/s^2 = 5.6 m/s^2 (rounded to two significant figures).

The acceleration experienced by the wagon when pulled by the man depends on the force applied and the mass of the wagon.

When the wagon is empty, the force applied by the man causes an acceleration of 1.4 m/s^2. Let's denote the mass of the empty wagon as m_wagon.

Now, when the wagon contains a child whose mass is three times that of the wagon (3m_wagon), the total mass of the wagon and the child is now 4m_wagon.

According to Newton's second law of motion, F = ma, where F is the applied force, m is the mass, and a is the acceleration. Since the force applied remains the same, we have:

F = m_wagon * a (for the empty wagon)

F = 4m_wagon * a' (for the wagon with the child)

Since the force applied is the same in both cases, we can equate the two expressions:

m_wagon * a = 4m_wagon * a'

Dividing both sides of the equation by m_wagon, we get:

a = 4a'

Simplifying, we find that the acceleration when pulling the wagon with the child is four times the acceleration when pulling the empty wagon. Therefore, the acceleration when pulling the wagon with the child is 4 * 1.4 m/s^2 = 5.6 m/s^2 (rounded to two significant figures).

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