Which of the Materials are conductors?(select all apply)

Answer: optical telescope.

Answer - A substance through which a wave can travel is a medium

Explanation:

A medium is the middle point between the crest and trough and it helps to Carry the wave or you can call it the disturbance of the wave . .

A substance through which a wave can travel is called a medium.

A medium acts as a conduit for the transfer of energy from one point to another by allowing the wave to propagate. Waves require a physical medium to transmit their energy because they rely on the interaction and displacement of particles within the medium.

When a wave passes through a medium, it causes the particles of the medium to vibrate or oscillate in a specific pattern. These vibrations transfer energy from one particle to the next, enabling the wave to travel. The type of medium determines the properties of the wave, such as its speed, direction, and behavior.

Electromagnetic waves, such as light and radio waves, can propagate through a vacuum because they consist of oscillating electric and magnetic fields rather than relying on particles for transmission. These waves can travel through space, allowing us to observe distant stars and communicate wirelessly.

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Answer:

the sixth most abundant element in the earth's crust is sodium and it occupies 2.8%

Final answer:

The six next most abundant elements after oxygen and silicon make up 23.7% of the Earth's crust.

Explanation:

The student asked about the percentage of the Earth's crust made up by the six next most abundant elements after oxygen and silicon. Given that Oxygen and Silicon together make up 74.3% of the Earth's crust (46.6% oxygen and 27.7% silicon), we know that the eight most abundant elements constitute 98% of the Earth's crust. To find the combined percentage of the six following most abundant elements, we subtract the percentage of oxygen and silicon from 98%, which is 98% - 74.3% = 23.7%. Hence, aluminium, iron, calcium, sodium, potassium, and magnesium together make up 23.7% of the Earth's crust.

ultra high frequency sound

Explanation:

Ultraviolet light, infrared light, and visible light are all examples of electromagnetic waves.

Ultra high frequency sound, on the other hand, is a type of mechanical wave. Sound waves are mechanical waves that require a medium (such as air, water, or solid) to propagate, while electromagnetic waves do not require a medium and can travel through a vacuum (like in space). Ultra high frequency sound is not classified as an electromagnetic wave

Answer:

Check below for the answers and explanations.

Explanation:

Note: You did not provide the diagram you mentioned but I will explain to you the sequence of events that take place as a fluid cools. I believe you can apply this to the particular diagram that you have.

Sequence of events that take place as a fluid cools down:

The sequence of events that occur when a fluid cools down are;

The temperature of the liquid will drop

We have to note that according to the kinetic theory of matter, the molecules of a liquid are in constant random motion. The kinetic energy of these molecules depend on the temperature of the liquid.

The five sequence of event that happens as liquid molecules cool down are;

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All of the following are common symptoms of all dissociative disorders except wandering away from home.

Dissociative disorder, or dissociative identity disorder, is a psychological disorder in which a person has changes in consciousness, memory, identity, emotion, perception of the environment, control of movements and behavior, which can happen after traumatic or high-stress events.

Overview of dissociative disorders.

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Answer:

3 m/sec(squared)

Explanation:

a=change in velocity/time

a=v-u/t

a=36-0=36/12

a=3m/s(squared)

The acceleration is 3 m/s².

To calculate the acceleration, the velocities given are:

Initial velocity u = 0 m/s,

Final velocity v = 36 m/s,

Time, t = 12 seconds.

Definition:

      Acceleration can be defined as the total change in velocity, i.e., change in final velocity to the change in initial velocity to the total time taken.

       Acceleration is a vector quantity as it has both magnitude and direction.

  Formula for Acceleration, a = (( v - u) /t ) m/s².

                        [tex]\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}[/tex]

v = Final velocity

u = Initial velocity

t = Time taken

Substitute all the given values in the formula,

            a = ( 36 - 0) / 12

               = 36 / 12

            a = 3 m/s².

Thus, the truck's acceleration is calculated as 3 m/s².

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Answer:

14.6m/s

Explanation:

elastic collision formula

mv1+mv2=mv1'+mv2'

mv1= mass times velocity of the first object

mv2= mass times velocity of the second object

mv1'=mass times velocity of the first object after the collision

mv2= mass times velocity of the second object after the collision.

we know that the pin is not moving so we multiply 0 or its velocity by the mass 0.9kg this equals zero so we don't add this part to the equation.

mv1=mv1'+mv2'

plugin the values and solve using order of operations

12kg(2.4m/s)=12kg(1.3m/s)+0.9kg(v2')

28.8kg.m/s=15.6kg.m/s+0.9kg(v2')

at this point you need to move 15.6kg.m/s to the other side of the equation so subtract 15.6kg.m/s to 28.8kg.m/s

28.8kg.m/s=15.6kg.m/s+0.9kg(v2')

28.8kg.m/s - 15.6kg.m/s= 0.9kg(v2')

finally Divide by 0.9kg in order to leave v2' in one side.

13.2kg.m/s=0.9kg(v2')

13.2kg.m/s÷0.9kg=v2'

14.6kg.m/s=v2'

Explanation:

Image? there is not image in there so I wouldn't be able to answer it properly...

Riding river rapids uses the kinetic energy of water to propel a kayak, while hydroelectric systems control and convert this energy into electricity.

How Energy is Used to Ride the River's Rapids:

When riding the river's rapids, a person uses kinetic energy inherent in the flowing water. The experience can be thrilling, as one navigates through the rushing white water in a kayak or other vessel. The power of a river's flow is a result of its ability to convert mechanical (potential) energy into thermal energy and hydroelectric power. In the case of rapids, the conversion of potential energy into kinetic energy creates the movement and force that propel the kayak downhill, offering the energy needed for the ride.

Similarly, hydroelectric systems like run-of-the-river projects harness the energy of a river in a more controlled manner. By directing water through a turbine—similar to how rapids propel a kayak—these systems convert the river's kinetic energy into mechanical energy, and subsequently into electricity with minimal energy lost as heat.

Answer:

Well, I think the best answer will be is 1.59 g/mL Good Luck!

The density of carbon tetrachloride in the flask is calculated by subtracting the weight of the empty flask from the total weight to get the weight of the carbon tetrachloride. Then, use the formula density = mass/volume, which results to 1.589 g/mL.

To calculate the density of carbon tetrachloride in the flask, first determine the weight of the carbon tetrachloride by subtracting the weight of the empty flask from the total weight. So, 703.55 g (the total weight) - 345.8 g (the weight of the flask) = 357.75 g (weight of carbon tetrachloride).

Next, we use the formula for density which is: density = mass/volume. Our mass (weight of carbon tetrachloride) is 357.75 g and our volume is 225 ml. Therefore, the density of carbon tetrachloride is 357.75 g / 225 ml = 1.589 g/mL.

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Light can travel through empty space (a), has no mass (b) and is made up of moving electric and magnetic fields (d). It does not consist of moving electrons.

In analyzing the statements about light, the following are true:

Statement c which says light has moving electrons is untrue. Instead, light is made up of particles called photons, which are massless and don't consist of electrons.

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Answer: Frequency

Explanation:

The value of two per second is a measure of the frequency of a wave. It indicates that the wave completes two cycles in one second.

In physics, frequency and period are two related concepts that are used to describe the properties of waves. Period, on the other hand, is a measure of the time it takes for one complete cycle of a wave.

Here,
Frequency is a fundamental property of waves, and it determines the pitch of sound waves and the color of light waves. Waves with a high frequency have a high pitch or a high color temperature, while waves with a low frequency have a low pitch or a low color temperature.

In general, the higher the frequency of a wave, the more energy it carries and the shorter its wavelength. The relationship between frequency and other properties of waves, such as wavelength and speed, is described by various wave equations and laws in physics.

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Answer: Positive acceleration means increase in velocity with time. Negative acceleration means the speed reduces with the time.

The wavelength of the first order bright band light light is 714 nm .

Explanation:

We have to find the wavelength of the first order brightness of a light. Here we are using Huygen's principle of light.

The formula is

nλ =d sinθ

where, n is the order of maximum

            λ is the wavelength of light

            d is the distance between the lines on diffraction grating.

            θ is the angle.

For the given equation n is 1 because the problem states that the light forms 1st order bright band

  λ  is unknown.

d = [tex]\frac{1}{700,000}[/tex] or 0.0000014 m

sin (30) = 0.5

so,

1(λ) = (0.0000014)(0.5)

     = 0.0000000714

     = 714 nm

Thus, The wavelength of the first order bright band light light is 714 nm .

Answer:

Reduce the force

Explanation:

By newtons third law

F=m×a

or

Force =Mass ×Acceleration

In other words

Acceleration=Force/Mass

If the mass drops, to maintain the same acceleration, you need to reduce the force too

Answer:

The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.

the answer is 3.75 kgm/s

Momentum= mass x distance

1.31 x 2.86= 0.375kgm/s

Answer:

you should have given the passage too bt i think option b is correct..

Answer:

50 Volts

Explanation:

Using Ohm's Law

V= I x R

V= 5 x 10

V = 50 V

This graph shows data up to about 2010. So it couldn't have been drawn before 2010. OF COURSE the data from only 10 years earlier was more reliable than the data that was 120 years old ! It wasn't even measured the same way back then as it is now.

Error bars are used to show the error in a reported measurement. The reason why the error bars are smaller near the year 2000 than in the 1890s because the ways of measuring have changed majorly over the past 100 years. The ways of measuring 100 years ago were probably not as accurate as the ways of measuring today.

Best of Luck!

Answer:

.42

Explanation:

Answer:

0.42

Explanation:

Answer:

C, a pulley! A pulley is made of a wheel and rope and in the case of the flagpole, it uses the pulley to raise the flag by pulling the rope.

Answer:

The nervous system does depend on other systems visa versa.

Explanation:

They depend on each other because the brain needs nutrients given from the system and also the systems need the sensors from the nervous system.

Answer:

1521π cm³

Explanation:

V = π·r²·h/3

= π·13²·27/3

= π·169·9

= 1521π cm³

An unopened door pushed by two people with same force is the example for balanced Fnet=0N

Explanation:

There are two types of forces that acts on an object.

Balanced force and unbalanced force

In balanced force the net force becomes zero as the name itself indicates that the forces acting on the object gets balanced and cancels out each other.

Example:- Consider a door, and if two people with equal forces are trying to push the door. Then the net force becomes zero as the door remains not opened.

In unbalanced force the net force will not be zero as the forces acting on them are not equal.

Example: Soccer game ball pushed by the player is the best example.

The net force describes the sum or all the forces acting in the different directions on an object. When the net force is 0, then the force is balanced, otherwise, it is unbalanced.

A scenario where we have a balanced force would be a situation whereby a box at rest is being pushed in opposite direction.

When the force which tends to propel the box forward is equal to the force which tends to push the ball backward. Then the ball would not move and remain in the same position.

Hence, the net force acting on the box is balanced.

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Explanation:

F = ma

120.0 N = (3.00 kg) a

a = 40.0 m/s²

Answer:

10 m/s

Explanation:

110/11=10

Answer:

10 m/s

Explanation:

110/11=  10 m/s