How long did the family stay at the beach?
(A) 4 hours
(B) 10 hours
(C) 90 hours

Answer:

destructive i.e. colour of light wont reflect from  film

Explanation:

An anti-reflection (AR) coating needs to have zero reflectance in air for light with a wavelength equal to four times the coating thickness.

Lens surfaces, other optical components, and photovoltaic cells can all benefit from an anti-reflection (AR) coating, which is a form of optical coating used to reduce the reflection.

Here,

Anti-reflective coatings are utilised in a wide range of applications where it is desirable to have low loss or low reflection of light as it travels through an optical surface.

The simplest interference anti-reflective coating consists of a single, extremely thin layer of transparent material with a refractive index equal to the square root of the substrate's refractive index. A coating of this type should theoretically have zero reflectance in air for light with a wavelength (inside the coating) equal to four times the coating thickness. For wavelengths in a wide band around the centre, reflection is similarly reduced. A "quarter-wave layer" is a layer that has a thickness equal to one-fourth of a design wavelength.

Hence,

An anti-reflection (AR) coating needs to have zero reflectance in air for light with a wavelength equal to four times the coating thickness.

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Answer: 3.766 seconds

Explanation:

[tex]$$ Total length of bamboo $=4 \times 88 \mathrm{~cm}=352 \mathrm{~cm}=3.52 \mathrm{~m}$\\Pendulum's period $=2 \pi \sqrt{\frac{L}{g}}\\ $=2\pi \sqrt{\frac{3.52}{9.8}} \\=3.766 \mathrm{sec}$$[/tex]

Albert bandura emphasized the idea of self-efficacy which is the belief one has in one’s own ability to succeed

Self-efficacy is a person’s belief in their ability to succeed in a particular situation. Psychologist Albert Bandura described these beliefs as determinants of how people think, behave, and feel.

Self-efficacy can play a role in not only how you feel about yourself, but whether or not you successfully achieve your goals in life. The concept of self-efficacy is central to Albert Bandura’s social cognitive theory,

which emphasizes the role of observational learning, social experience, and reciprocal determinism in developing a personality.

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Usually it appears that the moon is moving because of the clouds! if there's no clouds then it's just kinda an illusion you get in the car lol because the car moves but the moon stays in the same place, and because it's so big you can see it anywhere!

Nerdy answer: Because Earth rotates on its axis from west to east :I

Usually it appears that the moon is moving because of the clouds! if there's no clouds then it's just kinda an illusion you get in the car lol because the car moves but the moon stays in the same place, and because it's so big you can see it anywhere! Nerdy answer: Because Earth rotates on its axis from west to east :I

Answer:

The squares of the orbital periods of the planets are directly proportional to the cubes of the semi-major axes of their orbits. Kepler's Third Law implies that the period for a planet to orbit the Sun increases rapidly with the radius of its orbit.

Explanation:

Answer:    7.94

7.94

Explanation: i got u

Two speakers, A and B, produce identical sound waves. A listener is 3.20 m from speaker A. The listener is  2.367 meters away from speaker B.

The distance between a listener and a speaker for constructive interference is given by:

Distance = (m × λ) ÷ 2

The speed of the sound is given by:

v = f × λ

Where:

v is the speed of sound

f is the frequency (72.4 Hz)

The wavelength obtained is:

λ = v ÷ f

λ = 343 ÷ 72.4

λ = 4.734 m

Since the listener is experiencing constructive interference, the order of interference (m) is likely 1:

Distance = (m × λ) ÷ 2

Distance = (1 × 4.734) ÷ 2

Distance = 2.367 m

Therefore, the listener is  2.367 meters away from speaker B.

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Answer:

2.029×10^-18 J

Explanation:

E=hv

so

E=(3.06×10^15)*(6.63×10^-34)

E=2.029×10^-18 J

Answer:

soil additive

Explanation:

Soil Additive

The three main components of humus are fulvic acid, humic acid and humin. The spongy nature of humus helps it to trap and hold water, this particular property also helps to aerate the soil as humus expands and contracts with available water.

Kinetic energy= 1/2 mv²

= 1/2 ×12×4

=24 J

Answer:

True?

Explanation:Im sure of it?

According to the universal law of gravitation, the force between 2 objects (m1 and m2) is proportional to their plenty and reciprocally proportional to the sq. of the distance (R) between them.

From the data in the given table, it can. be concluded that the angle of refraction decreases with increasing wavelength.

The wavelength of a wave is the distance between two successive points on the wave.

The wavelength of a wave is usually measured in metres.

The angle of refraction is the angle to which a wave is bent from the normal.

The color of light that has the shortest wavelength is Red while violet has the longest wavelength.

From the table provided, it can be seen that the angle of refraction decreases with increasing wavelength.

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The kinetic energy of the electron after the head collision with the photon will be 9.93 x 10⁻¹⁶ J.

The kinetic energy of the electron is calculated as follows;

K.E = qV

where;

K.E = 6.2 x (10³) x 1.602 x 10⁻¹⁹ J

K.E = 9.93 x 10⁻¹⁶ J

Thus, based on the principle of conservation of energy, the kinetic energy of the electron after the head collision with the photon will be 9.93 x 10⁻¹⁶ J.

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Answer:

2.3 m/s

Explanation:

Speed is  measured in m/s

7 m / 3 s =   2.3 m/s   ( to the nearest tenth)

The average speed of block is 2.33 m/s.

So, from the formula,

                       ∴  S = D / T

                       ∴  S = 7  / 3

                       ∴  S = 2.333 m/s

To the nearest tenth, S = 2.3 m/s.

Thus, The average speed of block is 2.33 m/s.

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Answer: A

Explanation:

There is one important fact about magnetic fields. Magnetic fields are always perpendicular to the velocity of the particle, and the force acting on the particle. This is evident in the Lorentz force equation for magnetic fields, which states:

[tex]F=q(v x B)[/tex]

The cross product between between the velocity and the magentic field forms a force vector that is perpendicular to both the velocity and the field. In our example, the electron is traveling to the left, and the force it feels is upwards. One thing to keep in mind now, is that the Lorentz force equation is for positively charged particles. Therefore, whatever result we obtain for the field, it is actually the opposite since our particle is negatively charged.

Point your thumb in the direction of the velocity, and point your palm in the direction of the force. Your fingers should be pointing towards yourself (the south). This would be correct for positive charges, but it is the opposite for negative charges. The magnetic field points away from your body, which is the north.

Answer:

1. diffusion

2. circulatory

3. trachea

5. larynx

4. i don't know

Answer:

Shiny objects don't absorb heat as well as dull objects. Shiny objects reflect heat or they reflect more heat then absorb it. So the heat thats being hit on a shiny object is being reflected instead of being absorbed. Dull objects are better at aborbing heat. So that makes dull objects heat up faster than shiny objects, since shiny reflects more and dull doesn't as much.

Explanation:

I hope it helps! Have a great day!

pan~

Explanation: The amount of solar energy available varies by location on earth, the time of the day at that location, the season and weather conditions. Rain, fog, and clouds will lower the amount of solar power available to gather and there are fewer hours of sun available in different seasons (winter for North America). To gather solar power, you also need a large area. This can be lessened by conditions such as snow, so that even on a sunny day, covered panels will collect less energy.

Answer:

.

Explanation:

The quantity of solar energy accessible varies by location on the planet, time of day, season, and weather conditions. Rain, fog, and clouds reduce the quantity of solar power available for collection, and various seasons have less hours of sunlight accessible (winter for North America). A big region is also required to collect solar electricity. Conditions such as snow can reduce this, such that even on a sunny day, covered panels will absorb less energy.

After completion of the trip described in the question, it would be the year 2320 on Earth.

This has to do with the way light-years are described. A light-year is in fact not a measurement of time, but of distance. It is how far you would travel in one year if traveling at the speed of light. So since the star is 100 light-years away, it would take 100 Earth years to get there and then 100 more to get back, making the current Earth year 2320.

Therefore, we can confirm that after completion of the trip described in the question, it would be the year 2320 on Earth.

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From our knowledge of the lense formula, the image formed is upright, real, smaller.

A lens refers to any refracting surface. Now we are told that the object distnce is 25 cm and the focal length is 15 cm.

Using the lens formula;

1/f = 1/v + 1/u

1/v = 1/f - 1/u

1/v = 1/15 - 1/25

1/v = 25 +  15 /375

v = 375/40

v = 9 cm

Hence, the image formed is upright, real, smaller.

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Answer:

All of the above is the correct answer!!!

Explanation:

mark me brainliest

The reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle.

The mirror is an optic device that can either be plane or curved that produces an image through the law of reflection.

There are three main types of mirror which includes:

The characteristics of the image formed by the concave mirror depends on the distance of the object from the mirror and it include the following:

Therefore, the reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle.

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Answer:

A: The reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle.

Explanation:

quick and simple

Answer:

1. What type of wave is sound?

2.Does sound need a medium to travel through?

3. What are the properties of sound waves?

Explanation:

1. The type of waves sound are is mechanical waves.

2. Sound needs a solid, liquid or gas (material medium) to travel through.

3. I believe they are wavelength, amplitude, frequency, time period and velocity. 

I apologize if it is incorrect-

I hope it helps! Have a great day!

Anygays-

Answer:

27N

Explanation: workdone = force * distance

         Hence Force= workdone/distance

                               = 405/15

                               = 27N

Answer:

0.8

Explanation:

F=uR

F=8,000N

R= 1000*10=10000

u=F/R

u= 8000/10000

u=0.8

Both will have equal forces because the force exerted on the bus will be equal to the force experienced by the bug.

Newton's third law of motion states that action and reaction are equal and opposite.

This implies that, the force exerted on an object is equal to the reaction experienced by the object.

Fa = -Fb

The force exerted on the bus will be equal to the force experienced by the bug.

Thus, both will have equal forces.

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In the first direct detection of gravitational waves by LIGO, the waves came from the merger of two black holes.

This is defined as propagation of disturbances from place to place in an organized manner.

In 2015,  Laser Interferometer Gravitational-Wave Observatory(LIGO) observed gravitational waves which was a result of merger of two black holes and lasted fraction of a second.

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For a 3 m long ladder leaning against a frictionless wall, the minimum value of the coefficient of static friction is mathematically given as

mu=0.2886

Generally, the equation for the Force  is mathematically given as[tex]-\mu N_{1}+N_{2}=0[/tex]

Therefore

[tex]\mu=\frac{1}{2}tan\theta[/tex]

[tex]\mu=\frac{1}{2}tan30^{0}[/tex]

mu=0.2886

In conclusion, the minimum value of the coefficient of static friction

mu=0.2886

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Answer:

A

Explanation:

SPEED = DISTANCE/TIME

Therefore:-

Speed = 400 m /5 min

Speed = 80m/min

By applying Coulomb's law between the charges, the net force on the charged particle q₁ due to particle q₂ and q₃ is -9.86 N.

The distance between the second charge and the third charge is given as;

r = 0.3 m

[tex]F_{2} = \frac{kq_2q_3}{r^2} \\\\F_{2}= \frac{(8.99\times10^9) (7.7 \times 10^{-6})(5.9\times 10^{-6}) }{0.3^2} \\\\F_2 = 4.54\ N[/tex]

The net force on particle q₁ is determined by summing the individual forces together;

F(net) = F₁ + F₂

F(net) = -14.4 + 4.54

F(net) = -9.86 N

Thus, by applying Coulomb's law between the charges, the net force on the charged particle q₁ due to particle q₂ and q₃ is -9.86 N.

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Answer:

0.25m -14.4

Explanation:

Acellus :)