A linearly polarized microwave of wavelength 1.50cm is directed along the positive x axis. The electric field vector has a maximum value of 175V/m and vibrates in the x y plane. Assuming the magnetic field component of the wave can be written in the form B=Bmax sin (k x-Ω t) give values for (f) If this wave were directed at normal incidence onto a perfectly reflecting sheet, what radiation pressure would it exert?

Answer:

C - it will increase the resistance in the circuit

Explanation:

edge 2021

It will increase the resistance in the circuit will the extension cord have on the circuit. So, the correct option is C.

Resistance is defined as the measure of opposition to the flow of current in an electrical circuit and is measured in ohms which is represented by the Greek letter omega (Ω). Ohm is named after Georg Simon Ohm (1784–1854), the German physicist who studied the relationship between voltage, current, and resistance.

Resistance is also defined as the ratio of the applied voltage to the current flowing through it. The resistance in the circuit will increases when the extension cord have on the circuit. It is represented as:

R = VI

where, R = resistance (Ohms, Ω)

V = voltage difference which is between the two ends of a resistor (Volts, V)

I = the current which flows through a resistor (Amperes, A)

Therefore, the correct option is C.

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Answer:

(a) 15 N

(b) 39.2 N

(c) The coefficient of sliding friction is 2.61[tex]\bar 3[/tex]

Explanation:

The given parameters are;

The mass of the brick = 4.0 kg

The nature of the surface on which the brick rests = Horizontal

The force needed to move the brick from rest = 15 N

(a) Given that the body is not accelerating, the force applied = The frictional force = 15 N

Which can also be expressed as follows;

The magnitude of the frictional force = The force needed to push the brick to move from rest and move with a constant velocity = 15 N

(b) The magnitude of the normal force = The force acting at right angles to the surface opposite in direction and equal in magnitude to the weight of the brick, so as hold the brick and prevent it from passing through the surface. which is given as follows;

The weight of the block = The magnitude of the normal force =The mass × The acceleration due to gravity = 4.0 × 9.8 = 39.2 N

The magnitude of the normal force = 39.2 N

(c) The frictional force, F = [tex]\mu _k[/tex] × Normal force

Where;

[tex]\mu _k[/tex] = The coefficient sliding friction

By substituting the known values gives

15 = μ × 39.2

[tex]\mu _k[/tex] = 15/39.2 = 2.61[tex]\bar 3[/tex].

The answer is C, as it states it's made of ONLY carbon atoms, not any others.

The answer is also A, because Graphite is still considered a compound.

A pencil "lead" is actually made of graphite. graphite is made exclusively of carbon atoms. The two terms that best describe graphite are pure substance and element. The correct options are options (c) and (d).

Graphite is considered a pure substance because it consists solely of carbon atoms. It is not a mixture because it does not contain different types of atoms or compounds.

Additionally, graphite is classified as an element because it is composed of only one type of atom, carbon.

Therefore, the correct answer is C. pure substance and D. element.

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Answer:

2

1

2

1

3

1

Explanation:

I'm pretty sure these are right. you might want to go back and check the first and third, but the other 4 are right

The greater mass will have greater acceleration is a fact from second law of motion. Thus, first situation is an example of second law. Spilling of water from the glass indicates the first law , that is law of inertia.

Newton' s first law of motion states that, every body tends to continue on the state of motion or rest until an external force acts upon it. This law is called law of inertia.

Second law states that the force applied on a body is directly proportional to the mass and acceleration.

Newton's third law states that, for every action there is an equal and opposite reaction. The first statement indicates the second law of motion and water spilling indicates the law of inertia.

As the mass increases, more force to be applied and acceleration decreases with mass. Thus third situation indicates second law. The magician pulling the cloth from stationary, hence it is first law.

A rocket launches by a force applied on the space and an opposing force from the fuel make it move indicating the third law. The last situation indicates the first law. Hence, the labeling is as 2,1,2,1,3,1.

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Answer:

Inversly or Indirectly

Explanation:

the voltage (V) and inversely proportional to the resistance (R).

Hope it helps!

Answer:

Air slows down The fall of any object including a ball.

A limitation of modeling the effect of gravity on a falling object by using a ball dropped from different heights is: gravity varies slightly at different heights. Hence, option (C) is correct.

Gravity is a fundamental interaction in physics that causes all objects with mass or energy to attract one another. The electromagnetic force is 10³⁶ times stronger than gravity  the weak interaction is 10²⁹ times weaker than gravity, and gravity is by far the weakest of the four fundamental interactions.

As a result, it has no appreciable impact on subatomic particle level phenomena. However, at the macroscopic level, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.

As gravity is inversely proportional to the square of distance, it varies slightly at different heights. Hence, option (C) is correct.

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Answer:

D. μs = Fs/Fn

Explanation:

The static friction coefficient, is always less than 1, for this reason, the friction force will always be less than the force of the body weight.

Answer:

D is correct. I just did it!!

Explanation:

Hello!

Δv = 0.1 m/s

Use the equation F = m · a to solve for the acceleration:

5 = 15 · a

a = 1/3

The equation to solve for acceleration can be rewritten to solve for the change in velocity:

Δv / t = a

Δv = at

We are given the acceleration and time, therefore:

Δv = (1/3)(0.3)

Δv = 0.1 m/s

The maximum magnetic field Bmax is 5.833 × 10⁻⁷ T

Given that a linearly polarized microwave of wavelength 1.50cm is directed along the positive x axis and the electric field vector has a maximum value of 175V/m and vibrates in the x y plane.

And Assuming the magnetic field component of the wave can be written in the form B=Bmax sin (k x-Ω t), we need to find the expression for the maximum magnetic field Bmax.

Since the microwave is an electromagnetic wave, we use the relationship between the maximum magnetic field and maximum electric field of an electromagnetic wave is given by c = E/B where

Making B subject of ther formula, we have

B = E/c

Given that

Substituting the values of the variables into the equation, we have

B = E/c

B = 175 V/m ÷ 3 × 10⁸ m/s

B = 58.33 × 10⁻⁸ T

B = 5.833 × 10⁻⁷ T

So, the maximum magnetic field Bmax is 5.833 × 10⁻⁷ T

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Answer:

Atoms and molecules

Explanation:

Answer:

1.emit

2.absorb

3.reflect

not sure of the last one..hopes this helps : )

Explanation:

Emission nebulae emit light. Dark nebulae absorb visible radiation and reflect non-visible radiation.

Nebulae are distinguishable space regions of interstellar dust as well as a gas where stars are created.

Emission nebulae emit a kind of ultraviolet light from space that strikes ions in a nebula, driving the ions to emit visible light at different frequencies.

Dark nebulae form as a result of interstellar clouds with high dust concentrations and do not emit visible radiation. They usually absorb visible radiation and reflect non-visible radiation

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Answer:

true

Inertia. Sometimes this first law of motion is referred to as the law of inertia. Inertia is the property of a body to remain at rest or to remain in motion with constant velocity.

please give brainlist I actually needed it.

Answer:

2.25

Explanation:

2.25 - 4.00

2-4=2

25-00=25

= 2.25

2.25 - 4.00 = 2.25 because 2-4=2 and 25-00=25=2.25

The voltage difference across the circuit is equal to 9 V when 2.25 A current flows through the circuit.

Ohm’s law states that the voltage difference across any conductor is directly proportional to the current flowing through that conductor. Assuming temperature and all the physical conditions remain constant.

Ohm’s law can valid only if the temperature remains constant. Ohm’s SI unit is rho (Ω), and the current raises the temperature.

The mathematical formula of potential difference provided by Ohm/s law is:

V = IR

Where V is the potential difference and R is the resistance and I the current flowing.

Given, the resistance of the circuit, R = 4 ohm

The current flowing through the circuit, I = 2.25 A

The potential or voltage difference across the circuit will be:

V = I × R

V = 2.25 × 4

V = 9 Volt

Therefore, the potential difference across the circuit is equal to 9 V.

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Answer:

i think 35 cubic meters of water

Explanation:

Answer:when the heat is absorbed by a system, the reaction is endothermic

Explanation:

Answer:

c

Explanation:

u only use 10% of your brain

Answer:

D

Explanation:

Isostatic equilibrium is the state of gravitational equilibrium between Earth 's crust and the mantle.

Answer:

This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known.

so it wa The equation for the acceleration can be rewritten as to calculate the nets force acting on an object when its mass and acceleration

Answer: F=ma

Explanation:

Answer:

Option (C)

Explanation: According to the law of Uniformitarianism, the geological processes that is going on now, has undergone in the past and will be continued in the same way in the future too.

Due to this constant ongoing earth dynamic processes, in terms of millions of years, the previously exited landforms have undergone weathering and erosion, and subsequently deposition also has taken place, and gave the shape of the present existing landforms. These processes has occurred slowly and will be continued in the same way in the future also.

Thus, the correct answer is option (C).

Answer:

Given that the mass of the earth = 6 x 1024 kg, mass of the sun = 2 x 1030 kg, average distance between the two is 1.5 x 10-11 m and G = 6.67 x 10-11 Nm2kg-2

Explanation:

Answer:

Gases

Explanation:

The most important state of matter for the survival of human beings is the gaseous state.

 Gases are one of the most important state of matter. They are the bulk composition of the atmosphere and they condition many climatic phenomenon.

To humans beings, gases are vital for the following reasons,

Answer:

burns

Explanation:

Answer:

The average speed for the entire run is 12 km/h.

Explanation:      

The average speed is given by the following equation:

[tex] \overline{v} = \frac{d_{T}}{t_{T}} [/tex]

Where:

[tex]d_{T}[/tex]: is the total distance

[tex]t_{T}[/tex]: is the total time

If during the first hour, they ran a total of 13 kilometers and then, they ran 5.0 kilometers during the next half an hour we have:

[tex] d_{T} = 13 km + 5 km = 18 km [/tex]

[tex] t_{T} = 1 h + \frac{1}{2} h = 1.5 h [/tex]

Hence, the average speed is:

[tex] \overline{v} = \frac{d_{T}}{t_{T}} = \frac{18 km}{1.5 h} = 12 km/h [/tex]

Therefore, the average speed for the entire run is 12 km/h.

I hope it helps you!                                                                                      

No, it is not true that wet soil is easily picked up by the wind and carried away.

A strong wind rolls and lifts large volumes of soil and dust particles carrying them away and depositing them at some distant place.

In geology, we study that wind has the ability to carve the earth's surface through erosion and weathering processes.

However, wind can not pick up and carry only dry and lightweight particles of soil and dust.

It can not carry wet soil or heavy particles like rocks, wet sand, pebbles, and sediments from one place to another.

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The Earth's magnetic field lines appear to emanate perpendicularly from the poles and go round along the Earth from the  South Pole to the North Pole. Therefore, the Earth's magnetic field is generally not parallel to the ground at every location. It is parallel to the earth at the equator near the earth's surface.

The Earth's magnetic field, also known as the geomagnetic field, is a magnetic field that extends from the Earth's interior into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.

The magnetic field  varies in strength over the earth's surface. It is strongest at the poles and weakest at the equator.

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[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]

Here we go ~

In first 40 km, it travels with speed of 30 kmph

So, time taken in this span is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{40}{30} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{4}{3} \: \:hours[/tex]

And let's assume that it travels with uniform speed of x kmph during next 40 km

Now, time taken in this span of time is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{40}{x} \: \: kmph [/tex]

Now, we know the formula to find average velocity ~

[tex]\qquad \sf  \dashrightarrow \: v_{avg} = \dfrac{total \: \: distance \: \: covered}{total \: \: time \: \: taken} [/tex]

[tex]\qquad \sf  \dashrightarrow \: 40 = \dfrac{80}{ \frac{40}{30} + \frac{40}{x} } [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{40}{30} + \dfrac{4 0}{x} = \dfrac{80}{40} [/tex]

[tex]\qquad \sf  \dashrightarrow \: 40 \bigg( \dfrac{1}{30} + \dfrac{1}{ {x}^{} } \bigg) = \dfrac{80}{40} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{1}{30} + \dfrac{1}{ {x}^{} } = \dfrac{2}{40} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{1}{x} = \dfrac{1}{20} - \dfrac{1}{30} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{1}{x} = \dfrac{3 - 2}{60} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \dfrac{1}{x} = \dfrac{1}{60} [/tex]

[tex]\qquad \sf  \dashrightarrow \: x = 60 \: \: kmph[/tex]

So, for next 40 km, he need to maintain average speed of 60 kmph, in order to keep an average of 40 kmph for the whole trip ~

Answer:

15 kg

Explanation:

mass=force÷acceleration

force: 75N

acceleration: 5 m/s^2

mass = 75 / 5

= 15 kg

If the answer made sense, please give me brainliest :)

Answer: Northwest.

Explanation:

After the collision the second object which was at rest would change its direction and move towards the Northwest. The object in motion was coming from the east and traveling towards the west, where it deflects against a stationery object which changes its direction to southeast. And the object which was at rest moves toward the northwest.

Answer:

[tex]speed = \frac{distance}{time}[/tex]

Explanation:

The equation linking speed, distance and time is speed equals to distance divided by time!

Hope this helps! Have a great day :)