The radiation pressure directed at normal incidence onto a perfectly reflecting sheet is 2.71 × 10⁻⁷ Pa
What radiation pressure would it exert?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.
Also, 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, we desire to find the radiation pressure.
The radiation pressure for total reflection is given by P = 2I/c where
I = intensity = E²/2μ₀c where E = maximum electric field = 175 V/m, μ₀ = permeability of free space = 4π × 10⁻⁷ T/m and c = speed of light = 3 × 10⁸ m/sSo, P = 2I/c
P = 2E²/2μ₀c ÷ c
P = E²/μ₀c²
Substituting the values of the variables intot he equation, we have
P = E²/μ₀c²
P = (175 V/m)²/[4π × 10⁻⁷ T/m × (3 × 10⁸ m/s)²]
P = 30625 V²/m²/[4π × 10⁻⁷ T/m × 9 × 10¹⁶ m²/s²]
P = 30625 V²/m²/[36π × 10⁹ Tm/s²]
P = 30625 V²/m²/113.097 × 10⁹ Tm/s²
P = 270.78 × 10⁻⁹ Pa
P = 2.7078 × 10⁻⁷ Pa
P ≅ 2.71 × 10⁻⁷ Pa
So, the radiation pressure directed at normal incidence onto a perfectly reflecting sheet is 2.71 × 10⁻⁷ Pa
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For an object sitting on a surface that has a maximum force of static friction
Fs, max and a normal force Fn, which equation can be used to calculate the
coefficient of static friction?
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:
Need help on this one
Answer:
Inversly or Indirectly
Explanation:
the voltage (V) and inversely proportional to the resistance (R).
Hope it helps!
Changes of state occur when there is a change in:
Thermal energy
Electromagnetic energy
Chemical energy
Electrical energy
Since the particles of liquids are able to slide past each other into different locations they have ______.
a. no definite volume
b. definite volume
c. definite shape
d. no definite shape
An object moving due west collides with a second object that is initially at rest. Just after the collision the first object is moving toward the southeast. Just after the collision the second object must be moving toward the
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.
A. Group of cross country runners decided to go on an hour and a half run. During the first hour, they ran a total of 13 kilometers. Then, they ran 5.0 kilometers during the next half an hour. What was the group's average speed for the entire run?
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!
a circuit has 2.25 amps of current and a resistance of 4.00. what is the voltage difference across the circuit?
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.
What is Ohm's law?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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Density of water is 1000kg/meter cube. what will be the volume of 35000kg water
Answer:
i think 35 cubic meters of water
Explanation:
label each statement 1 2 or 3 for the law of motion it illudtrates
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.
What are laws of motion ?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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The smallest part of any material is the _______
Answer:
Atoms and molecules
Explanation:
Which state of matter, solid, liquid, or gas is the most important for the survival of human beings and why?
Please answer ASAP
And write 6 sentences why.
Thanks.
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,
Humans breathe in oxygen for their cellular respiration without which energy cannot be produced by the body. Also, plants on which human beings depends on produce their food using gases to manufacture their own food.What happens when plate subducts and reaches the mantle
Answer:
burns
Explanation:
TRUE OR FALSE? >:) FOR TEENS GRADE 7 ONLY
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.
On a 80 km track, a train travels 40 km with a uniform speed of 30 km h¹. How fast must the train travel the next 40 km so as to have average speed 40 km h-¹ for the entire trip?
[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 ~
5. is the earth’s magnetic field parallel to the ground at all locations? if not, where is it parallel to the surface? is its strength the same at all locations? if not, where is it greatest?
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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30 POINTS!!! I WILL ALSO GIVE BRAINLIEST TO CORRECT ANSWERThe uniformitarian principle states that:
Catastrophic events very likely changed the earth's surface.
Slow processes of erosion and deposition created landforms.
Landforms were created by fast changes.
The earth was once completely covered with water.
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).
Question 25 of 25 What is a limitation of modeling the effect of gravity on a falling object by using a ball dropped from different heights? A. Air slows down the fall of any object, including the ball. B. The weight of the ball can vary. C. Gravity varies slightly at different heights. D. The height that a ball bounces is affected by the height from which it was dropped.
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.
What is gravity?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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WHO HAS BIG BRAINS? not me... so please help?
What is isostasy dependent on a balance between?
A.)the downward push of the mantle and the upward push of the continents
B.)The downward push of the ocean floor and upward push of the continents
C.)The downward push of the continents and upward push of the mantle
D.)The downward push of the ocean floor and upward push of the mantle
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.
Please help me.
Drag and drop the words into the correct locations. Answers may be used more than once.
Emission nebulae _____ light. Dark nebulae _____ visible radiation and _____ non-visible radiation
: : absorb
: : emit
: : reflect
remember answers choice can be used more than once
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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True or false? wet soil is easily picked up by the wind and carried away. question 4 options: true false
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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What is the change in velocity of a 15 kg object that experiences a 5 N force for 0.3 seconds?
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 relationship among speed, distance and time is
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 :)
you know the mass of an object and the force applied to it. which equation will tell you the acceleration of the object?
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:
Cici uses a long extension cord to plug a lamp into a wall outlet in the next room.
What effect will the extension cord have on the circuit?
O It will decrease the resistance of the circuit.
O It will increase the voltage of the outlet.
O It will increase the resistance in the circuit.
O It will decrease the voltage of the outlet.
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.
What is Resistance?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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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 (a) Bmax
The maximum magnetic field Bmax is 5.833 × 10⁻⁷ T
How to find the value for Bmax the maximum magnetic field?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
c = speed of light, E = maximum electric field and B = maximum magnetic fieldMaking B subject of ther formula, we have
B = E/c
Given that
E = maximum electric field = 175 V/m and c = speed of light = 3 × 10⁸ m/sSubstituting 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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A force of 75N accelerates a box at 5 m/s2. What is the mass of the box?
Answer:
15 kg
Explanation:
mass=force÷acceleration
force: 75N
acceleration: 5 m/s^2
mass = 75 / 5
= 15 kg
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calculate the gravitational force between earth and sun
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:
Question is On the picture
Answer:when the heat is absorbed by a system, the reaction is endothermic
Explanation:
(6) A brick, with a mass of 4.0 kg., is placed on a horizontal surface. A
force of 15 N is needed to
push this brick towards the west at a constant velocity.
(a) What is the magnitude of the frictional force? Explain your answer.
(b) What is the magnitude of the normal force? Explain your answer
(c) Determine the value of the coefficient of sliding friction between the
brick and the
surface.
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].
a pencil "lead" is actually made of graphite.graphite is made exclusively of carbon atoms. which two terms best describes graphite? A. compound. B. mixture. C. pure substance. D. element
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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