what is electric switch​

Answer:

1. C speed

2. C Microwaves have a longer wavelength than visible light.

3. D sound

Explanation:

1. An X-ray is an electromagnetic wave. And these are waves that moves with the same speed in air. Thus all X-rays should travel with the same speed in air.

2. For electromagnetic waves, as the wavelength increases across the spectrum; the frequency of the wave decreases. Thus the correct statement is; microwaves have a longer wavelength than visible light.

3. Since electromagnetic waves moves with the same velocity (i.e the speed of light), then sound waves would not reach the earth. The correct option is D.

Answer:

During a thunderstorm, lightning is seen first and thunder is heard later on because light travels faster than sound. If you see a lightning flash but cannot hear any thunder, the thunderstorm is most likely be quite far away from you.

Answer:

The answer is D. Sound

Explanation:

Answer:

Newtons 3sd law

Force = mass × acceleration

3rd photo about momentum

Answer:

Magnitude = 55

Quantity = Speed

Explanation:

We are told that the speed is 55 mph. This implies that the magnitude is 55 while the unit is mph.

Also, physical quantities are usually things that can be measured such as distance, voltage, temperature e.t.c

Answer:

i think its speed

Explanation:

Answer:

Hey there here is your ans

Explanation:

Specular Reflection- bathroom mirror , glare on a pair of eyeglasses

Diffuse Reflection- reflection are the reading of a notebook

Tq

Specular reflection: glare on a pair of eyeglasses, bathroom mirror.

Diffuse reflection involves reading a notepad.

The direction in which a wavefront travels at an interface between two distinct media changes during the process of reflection. This allows the wavefront to go back into the medium in which it was first generated. Light, music, and water waves are all examples of common phenomena that may be reflected.

The following is a list of the three most common forms of reflection:

Glare on a pair of eyeglasses or the mirror in the bathroom is an example of specular reflection. Reading from a notebook is an example of diffuse reflection.

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Answer: Choice A, that X and Y are both positive

Explanation: positive charges are attracted to negative charges, so for their electric fields, positive charges point outward while negative charges point inward. In this model, it shows that both X and Y are pointing outward, hence they both have to have positive charges

Answer:

 E = [tex]\frac{1}{4\pi \epsilon_o } \ r^2[/tex]

Explanation:

For this exercise let's use Gauss's law. The Gaussian surface that follows the symmetry of the charges is a sphere

           Ф = ∫ E. dA = [tex]\frac{x_{int} }{\epsilon_o}[/tex]

the bold are vectors, the radii of the sphere and the electric field are parallel therefore the scalar product reduces to the algebraic product

           Ф = ∫ E dA = \frac{x_{int} }{\epsilon_o}

           E ∫ dA = \frac{x_{int} }{\epsilon_o}

           E A = \frac{x_{int} }{\epsilon_o}

the area of ​​a sphere is

            A = 4π r²

the charge inside the sphere is q = + q

we substitute

           E 4π r² = \frac{x }{\epsilon_o}

           E = [tex]\frac{1}{4\pi \epsilon_o } \ r^2[/tex]

Answer:

50 N

Explanation:

We are given;

Spring constant; K = 20N/cm

Extension; Δx = 2.5 cm

We want to find the load which is the force. This is gotten from the equation;

F = k•Δx

F = 20 × 2.5

F = 50 N

Therefore the load needed is 50 N.

Answer:

we can predict where they are in the future, know where they were in the past

can also build a device that generates a specific type of desired movement,

Explanation:

With the knowledge of the laws that govern the movement of bodies, we can predict where they are in the future and therefore know if there may be an accident, crash.

We can also know where they were in the past and therefore know if a fact is the result of these movements, craters, collapse of buildings, etc.

We can also build a device that generates a specific type of desired movement, for example pulleys that help us with work, etc.

Answer:

40 mph

Explanation:

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Answer:

it would decrease i think

Explanation:

Answer:

HMMMMMM??????

Explanation:

Answer:

B 4.18J\g degree C is the specific heat of water

F₂ = 1.723 x 10⁸ N

Given

Area of small piston : 0.004 m²

Area of large piston : 3.5 m²

Force 225 N

Required

Force applied

Solution

Pascal Law :

F₁/A₁=F₂/A₂

225/0.004 m² = F₂/3.5² m²

F₂ = 1.723 x 10⁸ N

Answer:

a) The frequency of the third harmonic is 786 Hz

b) The frequency of the first harmonic is 340 Hz

c) The frequency of the fifth harmonic is 1640 Hz

Explanation:

The rule is as follows:

If the first harmonic frequency (also called the fundamental frequency) is F, then:

The frequency of the second harmonic (also called the second overtone) is:

2*F

The frequency of the third harmonic (also called the third overtone) is:

3*F

And so on.

With this information, we can answer the questions:

a) We want to find the frequency of the third harmonic, such that the frequency of the first harmonic is 262 Hz.

Then we have F = 262Hz

And the frequency of the third harmonic will be:

3*F = 3*262Hz = 786 Hz

b) First harmonic for a string whose fifth harmonic frequency is 1700Hz.

Let's define F as the first frequency (the one we want to find)

Then the fifth harmonic frequency can be written as:

5*F = 1700Hz

With this equation we can find the value of F:

F = 1700Hz/5 = 340Hz

c) We want to find the fifth harmonic for a string whose third overtone (this is the same as the third harmonic) frequency is 984 Hz.

Then if the frequency of the first harmonic is F, we know that:

3*F = 984 Hz

With this we can find the value of F:

F = 984 Hz/3 =328 Hz

Now that we know the frequency of the first harmonic, we can find the frequency of the fifth harmonic:

5*F = 5*328 Hz = 1640 Hz

Answer:

mass=force/acceleratio

m=5000/1000

m=5kg

[tex]\huge\bf{\pink{\underline{\underline{\mathcal{AnSwer࿐}}}}}[/tex]

[tex]\longrightarrow[/tex] [tex]\underline{\boxed{\sf mass = \dfrac{force}{acceleration}}}[/tex]

:[tex]\implies[/tex] [tex]\sf mass = \dfrac{5000}{1000}[/tex]

:[tex]\implies[/tex] [tex]\sf mass = 5 kg [/tex]

hence, the required answer is 5kg.

Answer:

3.5kgm/s

Explanation:

We can calculate the momentum of Julieta

momentum = m(v-u)

Momentum = 0.2(20-2.5)

Momentum = 0.2(17.5)

Momentum = 3.5

Hence the momentum of Julieta is 3.5kgm/s

Answer:

72Watts

Explanation:

Power = Force * distance/Time

Given the following

Force = 2.4 x 10^2 = 240N

distance = 1.2m

Time = 4.0secs

Substitute

Power = 240*1.2/4

Power = 60 * 1.2

Power = 72watts

Hence the power required to lift the box is 72Watts

Answer:

letter D

Explanation:

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Answer:

below

Explanation: When a liquid changes into a gas vaporization has occurred. The process can either occur due to boiling or evaporation. Boiling occurs when the vapor pressure of the liquid is raised (by heating) to the point where it is equal to the atmospheric pressure.

You can use thermal energy to change a liquid into a gas.

By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy, or internal energy. Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.

For instance, the same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy) cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. However, the same fluid or solid in a moving state with the same energy (as mechanical energy) can be converted to work in some mechanical device, such as a windmill or a waterwheel.

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Answer:

Earth rotates eastward, in prograde motion.

Answer:

Earth rotates eastward, in prograde motion. As viewed from the North Pole, Earth turns counterclockwise.

Explanation:

Answer:

Longitudinal wave

Explanation:

Mechanical longitudinal waves are also called compressional or compression waves, because they produce compression and rarefaction when traveling through a medium, and pressure waves, because they produce increases and decreases in pressure.

Answer:

We conclude that the quantity of  the charge that flows through the wire in 50 s will be 45 C.

Explanation:

Given

To determine

We need to find the quantity of  the charge that flows through the wire in 50 s.

Important Tip:

A current of 1 Ampere = 1 Coulomb  of charge flowing in 1 second

Using the formula involving charge and current

[tex]I=\frac{Q}{t}[/tex]

where:

now substituting I = 0.9 and t = 50 in the formula

[tex]I=\frac{Q}{t}[/tex]

[tex]0.9\:=\:\frac{Q}{50}[/tex]

switch sides

[tex]\frac{Q}{50}=0.9[/tex]

Multiply both sides by 50

[tex]\frac{50Q}{50}=0.9\cdot \:50[/tex]

Simplify

[tex]Q=45[/tex] C

Therefore, we conclude that the quantity of  the charge that flows through the wire in 50 s will be 45 C.

Answer:

C

Explanation:

A newton is defined as 1 kg⋅m/s2.

One newton is therefore the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.

Answer:

Kinetic theory is based on the kinetic energy of moving particles.  In Boyle's Law the temperature is helped constant, so the kinetic energy of the molecules is a constant. The pressure and the volume are inversely related in Boyle's Law. In Kinetic theory pressure is created by the collision of particles.

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Explanation:

Answer:

Explanation:

Find the final velocity at which it struck the ground by using the kinetic energy formula.

[tex]KE=\frac{1}{2} mv^2[/tex]

[tex]2000=\frac{1}{2} (15)v^2\\v=16.33[/tex]

Now use kinematics to solve for the vertical displacement. We were given the initial velocity and acceleration can be assumed to be 9.8

[tex]V^2=V^2_i+2a(y_f-y_i)\\16.33^2=0^2+2(9.8)(y_f-y_i)[/tex]

Δy = 13.6 meters

Answer: The correct answers are C. and D.

Explanation:

Answer:

9.33333333 m / s2

Explanation:

140 N divided by 15 kg

Answer:

23.6 m

Explanation:

We are given that

Mass of ball, m=7.0 kg

Force, F=810 N

Distance, s=2.0 m

We have to find the height of ball from the point where it releases.

Work done=K.E

[tex]Fs=\frac{1}{2}mv^2[/tex]

[tex]v^2=\frac{2Fs}{m}[/tex]

Substitute the value

[tex]v^2=\frac{2\times 810\times 2}{7}[/tex]

[tex]v^2=\frac{3240}{7}[/tex]

K.E=P.E

[tex]\frac{1}{2}mv^2=mgh[/tex]

[tex]\frac{1}{2}v^2=gh[/tex]

Where g=[tex]9.8m/s^2[/tex]

[tex]\frac{1}{2}\times \frac{3240}{7}=9.8h[/tex]

[tex]h=\frac{3240}{7\times 2\times 9.8}[/tex]

[tex]h=23.6 m[/tex]