please help me im struggling​

Answer:

hi = 12mm or 1.2cm

Explanation:

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Kit ^w^

A slide projector has a magnification of 50. 12mm or 1.2cm.

Bringing an object as close to the eye as feasible when wishing to observe an object's details is instinctual. The angle that an object subtends at the eye increases with proximity to the eye, making it appear larger.

However, if an item is too near, the eye will no longer be able to generate a distinct image. The creation of a "virtual image" that may be comfortably observed is made possible by the use of a magnifying lens between the observer and the object.

The magnifier should be positioned exactly in front of the eye to provide the clearest image possible. Once a clear image of the thing is present, the object of interest is brought closer to the eye.

Therefore, A slide projector has a magnification of 50. 12mm or 1.2cm.

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Answer:

261.64 hz

Explanation:

speed = distance/ time

s= 200/0.78= 256.41 ms^-1

by using v= (f) x ( lambda)

256.41/ 0.98 = f = 261.64 hz

The frequency of the wave with the given wavelength, traveling the given distance at the given time is 261.6 Hertz.

Wavelength is the distance over which the shapes of waves are repeated.

From the wavelength, frequency and speed relation,

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given that;

First, we determine the speed.

Speed = Distance / time

Speed = 2.0×10²m / 0.78s

Speed = 256.4m/s

Now, we find the frequency.

λ = v ÷ f

f = v ÷ λ

f = 256.4m/s ÷ 0.98m

f = 261.6s⁻¹

f = 261.6Hz

Therefore the frequency of the wave with the given wavelength traveling the given distance at the given time is 261.6 Hertz.

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pretty cool not gonna lie

Answer:

[tex]2380\ \text{m}[/tex]

[tex]7.93\times 10^{-6}\ \text{s}[/tex]

Explanation:

t = Temps mis par la foudre pour parcourir la distance = 7 secondes

v = Vitesse du son dans l'air = 340 m / s

La distance est donnée par

[tex]s=vt\\\Rightarrow s=340\times 7\\\Rightarrow s=2380\ \text{m}[/tex]

L'éclair est tombé à une distance de [tex]2380\ \text{m}[/tex]

c = Speed of light = [tex]3\times 10^8\ \text{m/s}[/tex]

Le temps est donné par

[tex]t=\dfrac{s}{c}\\\Rightarrow t=\dfrac{2380}{3\times 10^8}\\\Rightarrow t=7.93\times 10^{-6}\ \text{s}[/tex]

Le temps mis par la lumière pour parcourir la distance est de [tex]7.93\times 10^{-6}\ \text{s}[/tex].

Answer:

EM radiation has a wavelength.

Explanation:

When electromagnetic (EM) radiation is explained using the particle model, the EM radiation has a wavelength.

According to De Broglie, all matter has an associated wavelength which is better known as the De Broglie wavelength.

This wavelength is given by; given by λ=h/p

Where;

p = mv

h = Plank's constant

m= mass of the body

v = velocity of the body

p = momentum of the body

Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays.Electromagnetic radiation has a wavelength.

Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays

When electromagnetic (EM) radiation is explained using the particle model, the EM radiation has a wavelength.

According to De Broglie, all matter has an associated wavelength which is better known as the De Broglie wavelength.

This wavelength is given by; given by

[tex]\lambda=\dfrac{h}{p}[/tex]  

Where;

p = mv

h = Plank's constant

m= mass of the body

v = velocity of the body

p = momentum of the body

Hence Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays.Electromagnetic radiation has a wavelength.

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Answer:

F = 3.86 x 10⁻⁶ N

Explanation:

First, we will find the distance between the two particles:

[tex]r = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2+(z_{2}-z_{1})^2}\\[/tex]

where,

r = distance between the particles = ?

(x₁, y₁, z₁) = (2, 5, 1)

(x₂, y₂, z₂) = (3, 2, 3)

Therefore,

[tex]r = \sqrt{(3-2)^2+(2-5)^2+(3-1)^2}\\r = 3.741\ m\\[/tex]

Now, we will calculate the magnitude of the force between the charges by using Coulomb's Law:

[tex]F = \frac{kq_{1}q_{2}}{r^2}\\[/tex]

where,

F = magnitude of force = ?

k = Coulomb's Constant = 9 x 10⁹ Nm²/C²

q₁ = magnitude of first charge = 2 x 10⁻⁸ C

q₂ = magnitude of second charge = 3 x 10⁻⁷ C

r = distance between the charges = 3.741 m

Therefore,

[tex]F = \frac{(9\ x\ 10^9\ Nm^2/C^2)(2\ x\ 10^{-8}\ C)(3\ x\ 10^{-7}\ C)}{(3.741\ m)^2}\\[/tex]

F = 3.86 x 10⁻⁶ N

The statement is false because as the temperature of water is decreased from 4C to 0C, expansion occurs.

You should understand that this is very weird behavior for any compound ... within a small temperature range, the stuff actually gets bigger as it gets colder.  That's why cubes float in your sody, and bergs float in the ocean.

Water is one of only two known substances that do this.  And if water didn't do it, then life on Earth would not be possible.  

Hmmm....

There is not contraction, Instead expansion occurs .

We know density of water is temperature dependant .

at 4°C water has max density so least volume as density is indirectly proportional to volume.

at 0°C density decreases so volume increases

Answer:

v = 1  i ^ m / s,   v = 1 m / s

Explanation:

In this problem we show the difference between vectors and scalars.

The average speed is

          v = Δx / Δt

The bold are vectors            

          Δx = 20-10 = 10 i^  m

           v = 10/10

           v = 1  i ^ m / s

the unit vector indicates that the velocity is on the x-axis

The average speed is

           v =Δx / Δt

           v = 10/10

           v = 1 m / s

in this case we have a scalar

Answer:

Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other.

Explanation:

Hope that helps!:)

Explanation:

La electricidad fue uno de los mayores inventos tecnológicos y científicos del mundo que permitió una gran evolución de la sociedad.

Es a través de la electricidad que podemos realizar tareas que parecen tan habituales en la actualidad, como usar luz eléctrica, usar internet, conservar alimentos, tomar baños calientes, y otras tareas que forman parte de la rutina diaria de miles de personas alrededor del mundo. mundo.

Por tanto, es importante observar en un contexto general cómo la electricidad ha traído beneficios a la humanidad, como la conservación de los alimentos por ejemplo, que ha facilitado la vida cotidiana.

En el entorno empresarial, la electricidad posibilitó la creación de máquinas, la automatización del trabajo, lo que facilita las funciones de los empleados, aumenta la seguridad de la empresa, permite el crecimiento empresarial y la aparición de muchos productos y servicios que existen en la economía actual.

En medicina ayudó en el tratamiento de enfermedades, en la creación de medicamentos, etc.

En la sociedad, la electricidad hace posible el saneamiento, permite una mejor calidad de vida para las personas, un mayor intercambio de información y varios otros desarrollos que tienen un impacto directo en la vida de cualquier persona.

Answer:

F' = 64 F

Explanation:

The electric force between charges is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]

Where

q₁ and q₂ are charges

r is the distance between charges

When  each charge is doubled and the distance between them is 1/4 its original magnitude such that,

q₁' = 2q₁, q₂' = 2q₂ and r' = (r/4)

New force,

[tex]F'=\dfrac{kq_1'q_2'}{r'^2}[/tex]

Apply new values,

[tex]F'=\dfrac{k\times 2q_1\times 2q_2}{(\dfrac{r}{4})^2}\\\\=\dfrac{k\times 4q_1q_2}{\dfrac{r^2}{16}}\\\\=64\times \dfrac{kq_1q_2}{r^2}\\\\=64F[/tex]

So, the new force becomes 64 times the initial force.

ok byy make me brilliant

Answer: 0.24 kg/m

Answer:

Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space.

Answer:

Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space.

Explanation:

Hope this helped Mark BRAINLEST

Answer:

1240 m/s

Explanation:

[Do you mean 0.035 kg bullet?]

Since the momentum of the system is conserved,

Let u m/s be the initial velocity of the bullet

0.035u = 8.6(5+0.035)

u ~= 1237.1714 m/s

u = 1240 m/s (3 sig. fig.)

Ocean breezes are primarily due to convection, which is the transfer of heat through the movement of fluids or gases.  The correct option is B.

Convection is a method of heat transfer that occurs in fluids (liquids and gases) and involves the movement of material carrying thermal energy. In convection, heat is transferred by the movement of hot fluid from one place to another, which then causes the transfer of heat from the hot fluid to the cooler fluid or surface it comes into contact with.

Convection can occur in two ways:

Natural convection: It occurs due to the density differences caused by temperature variations within a fluid. When a fluid is heated, its density decreases, making it lighter and causing it to rise. As it rises, it cools, becomes denser and falls back down, creating a cycle that is known as a convection current.

Forced convection: In this type of convection, a fluid is forced to flow over a surface or through a channel, by an external agent like a fan or pump. The forced flow enhances the rate of heat transfer from the surface or through the channel, as compared to natural convection, where the fluid flow is driven only by buoyancy forces.

Convection is a very important process for heat transfer in many natural and industrial applications, including heating and cooling systems, meteorology, oceanography, and more.

Here in the Question,

Ocean breezes are primarily due to convection, which is the transfer of heat through the movement of fluids or gases. As the sun heats up the surface of the ocean, the air above it also heats up and rises. This creates a low pressure area that draws in cooler air from over the land, resulting in a breeze that blows from the ocean towards the shore. This is why sea breezes are generally felt during the day, when the land is warmer than the sea, and why they tend to die down at night, when the opposite occurs.

Therefore, The correct answer is B i.e convection.

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Answer:

2

Explanation:

There are two open surfaces obtained in a closed cylindrical Gaussian surface when we apply Gauss's Law on an infinite length line of charges. The two surfaces are the upper circular base and the lower circular base.

Moreover, Gauss Law states that the net electric flow outside to a closed surface is proportional to the electric charge within the closed surface.

Answer:

I think it is difficult to determine what has caused climate change in the distant past because it must have been a long time ago so geologists can't carry out different experiments and figure out what gases the planet had conjured, so geologists can only make predictions based off the evidence they currently have from what the planet looked like before. The planet must have changed over the years, therefore the climate has also changed in the future, so they cannot work with how the planet looked in the past.

Answer:

 μ = 0.179

Explanation:

For this exercise we use the rotational equilibrium condition, where we set a reference system at the top of the ladder where it is in contact with the parent, we will assume the counterclockwise rotations as positive

         ∑ τ = 0

         W_stairs x/2 + W_man x’+ fr y - N x = 0

          fr y = -W_stairs x/2 - W_man x’ + N x

let's use trigonometry for distances

* the man up the ladder 78%

            l ’= 0.78 L

            cos 59 = x ’/ l’

            x’= 0.78 L cos 59

* the horizontal distance

           cos 59 = x / L

            x = L cos 59

* vertical distance

            sin 59 = Y / L

            y = L sin 59

we substitute

           fr L sin 59 = -W_stairs Lcos59 / 2 - W_man 0.78 L cos59 + N L cos59

           fr sin 59 = - ½ W_stairs cos 59 - 0.78 W_man cos 59 + N cos 59

           fr = ctan 59  (N - ½ W_stairs - 0.78 W_man)     (1)

Let's write the translational equilibrium equations

Y axis  

           N -W_stairs - W_man = 0

           N = W_stairs + W_man

           N = 85 + 21.5 9.8

           N = 295.7 N

we substitute in 1

           fr = ctg 59 (295.7 - ½ 85 - 0.78 21.5 9.8)

           fr = 0.6 (295.7 - 42.5 - 164.346)

           fr = 52.89 N

the expression for the friction force is

            fr = μ N

            μ = fr / N

             μ = 52.89 / 295.7  

             μ = 0.179

Answer:

Inorganic.

Explanation:

The chemical change which describes the reactions of elements and compounds that, in general, do not involve carbon and typically take place in laboratories or industries is inorganic.

In Chemistry, an inorganic chemical reaction can be defined as a type of chemical reaction that occurs without a carbon-hydrogen bond.

On the other hand, organic chemistry deals with reaction that occur in the presence of carbon-hydrogen bonds such as hydrocarbons.

Answer: i think its local drive

Explanation:

Answer:

on the server

Explanation:

thats how the cloud works

Me das mas información?

Answer:

jello

Explanation:

it jiggles

Evolution, is a process that results in changes in the genetic material of a population over time.

Answer:

[tex]4i+59j+33k[/tex]

Explanation:

Given that,

Vector A = 7i+4j-8k

vector B = 3i-3j+5k​

We need to find B×A. It can be calculated as follows :

[tex]B\times A=(3i-3j+5k)\times (7i+4j-8k)\\\\=i (24 - 20) - j (-24 - 35) + k (12 + 21) \\\\=4i+59j+33k[/tex]

So, the value of vector product is [tex]4i+59j+33k[/tex].

Answer:

The coils are not electrically connected. ... the primary coil current produces a magnetic field, which changes as the current changes. the iron core increases the strength of the magnetic field. the changing magnetic field induces a changing potential difference (voltage) in the secondary coil.

There is a voltage between the two terminals of the secondary coil because the magnetic field/magnetic flux is strengthened by the iron core. The secondary coil's potential difference (voltage) changes as the magnetic field changes. Energy is transferred by law of conversation .

Magnetic flux is the number of magnetic field lines passing through a closed surface.

There is a change in magnetic flux associated with a coil it gives rise to an induced current and hence an induced EMF in the coil. This phenomenon is called electromagnetic induction.

Law of conservation of energy states that energy can neither be created nor be destroyed . It can only be converted from one form to another form.

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Answer:

Yes because of the temputer

Explanation:

yes cause of the tempture