to keep food warm or cool coolers are made out of materials that are​

Final answer:

The energy required to eject photoelectrons from the surface can be found using the equation E = hf, where E is the energy and f is the frequency. Substituting the given values, the energy required is 5.30 x 10^-19 J.

Explanation:

Energy required to eject photoelectrons from the surface

Max speed of photoelectrons = 7.0 x 10^5 m/s

Frequency of light = 8.00 x 10^14 Hz

The energy required to eject photoelectrons can be found using the equation:

E = hf

Where E is the energy, h is Planck's constant (6.626 x 10^-34 J.s), and f is the frequency.
Substituting the values:

E = (6.626 x 10^-34 J.s)(8.00 x 10^14 Hz) = 5.30 x 10^-19 J

The energy required to eject photoelectrons from the surface is 5.30 x 10^-19 J.

Answer:

current

Explanation:

According to Ohm's law, a circuit with a high resistance will have a low electric current

Explanation:

The basic electricity law is Ohms law. It considers three important elements which that electrical quantities. They are voltage, resistance and current. According to this law, the electric current that flows in a circuit has direct proportionality to the voltage and inverse proportionality to the resistance.  

Thus, if a circuit has high resistance it implies that the electric current flowing in that circuit is low. If the circuit voltage is increased, there will be an increase in the current but the circuit resistance will remain unchanged. Hence, current is related with both voltage and resistance. Current has direct proportionality to voltage and inverse to the resistance.

The magnitude of the net force on the car and trailer system is 5000 N.

The magnitude of the net force on the car and trailer system can be calculated by subtracting the frictional force from the force exerted by the car's engine. In this case, the engine exerts a force of 6000 N and the frictional force is 1000 N. Therefore, the net force is 6000 N - 1000 N = 5000 N. So, the correct answer is c. 5000 N.

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Answer:

B) Boiling it at its boiling point

Explanation:

As we know that the heat required to convert the given substance from liquid to vapor at its boiling point is known as latent heat of vaporization

So here we know that

[tex]Q = mL[/tex]

here we know that

[tex]L = \frac{Q}{m}[/tex]

so it is known as the heat required to boil the given substance of unit mass at its boiling point

so correct answer will be

B) Boiling it at its boiling point

Answer:

Explanation:

There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

This is true. The break handles and brakes are levers and the seat adjustment (raise or lower) is a screw.

Answer:

True.

Explanation:

A bicycle is a compound machine.

Air resistance is type of contact force as the air should be in contact with the surface of moving

object to ocure air resistance.

The force that is a contact force as listed from the option is air resistance (Option A)

A contact force is a force that results from the direct contact between the objects involved. Some examples of contact force includes:

Non contact force on the other hand requires no contact with the objects involved. These forces includes:

With the above information, we can conclude that the contact force in the options given is air resistance (Option A)

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A fly and an eagle could have the same kinetic energy if the fly compensates its smaller mass by flying at a much higher velocity, whereas the eagle, which has a larger mass, would fly at a slower speed to achieve the same kinetic energy. This is a direct result of the kinetic energy formula and the principle of conservation of energy.

The scenario where a fly and an eagle have the same kinetic energy is actually possible. Kinetic energy, which is the energy an object possesses due to its motion, can be calculated using the formula ½mv², where 'm' is the mass of the object and 'v' is its velocity. For the fly and the eagle to have the same kinetic energy, the fly, which has a much smaller mass compared to the eagle, must compensate by having a much higher velocity. Conversely, the eagle with a larger mass can have the same kinetic energy by flying at a lower velocity.

For example, if we consider the kinetic energy formula, a very light fly (let's say 0.002 kg) moving at a high speed (say 20 m/s) would have a kinetic energy of 0.4 Joules. In comparison, a massive eagle (for instance, 4 kg) would only need to fly at around 0.14 m/s to have the same kinetic energy of 0.4 Joules. This illustrates how mass and velocity can vary inversely for different objects to have equivalent kinetic energies.

While it might seem counterintuitive, this is a direct consequence of conservation of energy and the kinetic energy relationship. The concept that energy cannot be created or destroyed, but only transferred or transformed, means that two vastly different animals could have the same kinetic energy if their masses and velocities are complementary.

Answer:

392 J

Explanation:

Gravitational potential energy is:

PE = mgh

where m is mass, g is acceleration of gravity, and h is the height.

PE = (5 kg) (9.8 m/s²) (8 m)

PE = 392 J

Answer:

B. Dmitri Mendeleev

Explanation:

he invented it

Dmitri Mendeleev, a chemist scientist is the one who designed the periodic table by organizing elements.

Answer: Option B

Explanation:

Dmitri Mendeleev, a chemist scientist is represented as the father of the periodic table. He was a popular lecturer in Russia during the 1860’s. He also an author of the book ‘Principles of chemistry’. The elements are being organized based on their atomic weight and based on which he designed the periodic table.

Answer:

Distance, Brighter

Explanation:

Think of a flash light, one close and one far which is brighter and which is dimmer.  

Hope this is what your teacher put as the answer!

Answer:

Distance, brighter  

Explanation:

Brightness depends upon the amount of power that is radiated by a star

This in turn follows the inverse square law. That is, as the distance from the object increases, brightness decreases as the square of the distance.

Color depends on the composition of the star's radiation.

When the stars are bright, it can be understood that they are closer, compared to other stars.

Amplitude modulation is used in AM radio.

Answer is A.

Answer:

Amplitude modulation is used in AM radio.

Explanation:

Information signals must be transported between a transmitter and a receiver on some form of transmission medium. However, information signals rarely find a suitable way to transmit. Therefore, modulation is defined as the process of transforming information from its original form to a form more suitable for transmission, and is performed on the transmitter in a circuit called a modulator.

AM means modulated amplitude or amplitude modulation; it consists in varying the amplitude of a carrier wave of relatively high frequency according to the amplitude of the modulating signal (information). Frequencies that are high enough to radiate efficiently through an antenna and propagate through free space are commonly called radio frequencies.

AM was the first technique that was used to make radio.

Then amplitude modulation is used in AM radio.

Answer:

D

Explanation:

Remember that magnets only attract at different poles. If both poles are the same, they repel

When two magnets are placed side by side they can either attract or repel each other depending on the arrangement of their poles. Option B correctly shows the magnets attracting each other.

When two magnets are placed side by side they can either attract or repel each other depending on the arrangement of their poles. In option B, the magnets are oriented in a way that the south pole of one magnet is facing the north pole of the other magnet. This is the correct representation of what happens when two magnets are placed side by side because opposite poles attract, resulting in the magnets sticking together.

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energy is the ability to do work while work is the dot product of force and displacement

Work is done by applying force. Energy is the ability to perform work or an action. Both are smaller units and are related closely.

Explanation:

Work is an act of overpowering resistance.It is done by applying force. It acts as evidence of empowerment of resistance form the application of force movement.  

The capability to perform some work or action is Energy. Energy can take different forms like light, electrical, heat, etc. The energy in motion is work. The energy changes form one form to another by the process of work. Work can be of only two forms. It can be either positive or negative.

Answer:

D

Explanation:

Orange juice at least is acidic and therefore not basic.

Toothpaste,bleach and shampoo are base. While orange has the acidic nature. Orange is not the base.

Acid is a chemical substance that, when dissolved in water, produces a solution with higher H+ ion activity than pure water.

A base is an aqueous material that receives protons, contributes electrons, or releases hydroxide (OH-) ions. A proton donor is an acid. A base, on the other hand, is a proton acceptor.

The important base and their uses;

1.sodium hydroxide, ------- Used in the manufacture of soaps

2.potassium hydroxide --------Used in the production of liquid soaps and soft soaps. Used in alkaline batteries.

Toothpaste,bleach and orange are base. While orange has the acidic nature. Orange is not the base.

Hence, option D is correct.

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Answer: C) ethanol fuel made from corn.

Explanation:

Ethanol made from corn is a type of biofuel, which is made from renewable resources known as biomass (plants, for example).

In the case of bioethanol, this is produced by the fermentation of sugars (from starch) contained in the organic matter of plants, such as beets or corn.

Therefore, the correct option is C.

Answer:

Explanation:

In our previous articles, we observed the theoretical formulas of Ohm’s law, its calculations in the lab report, and experiment. Today you’ll learn the verification of theory vs experimental results on a 1 kΩ resistor.

The theoretical results are obtained from the formula of Ohm’s law: V = IR. The experimental verification is provided for a metal film 1 kΩ (±0.05%). We have used a high-quality resistor with negligible tolerance value so as to reduce the tolerance error.

The little problem in our calculations arises due to improper handling of multimeter probes. You can learn the complete method to perform the Ohm’s experiment here and can calculate the current values by using the Ohm’s law calculator.

Answer:

the answer I think is A im so sorry if its wrong

Explanation:

Because yes we do have gases collapsing we also have dust collapsing with it and surrounding it to make a disk type of air flow that pushes it that makes it rotate if that makes sense. yet again super sorry if its wrong.

Answer:

the answer is actually B

Explanation:

When our solar system formed out of a gas cloud, called a nebula, there was lots of dust and gas coming together due to the force of gravity. The dust and gas was already moving around in a circle. As it all clumped together to form the Sun and planets, these new objects started to spin – and then spin faster.

i hope this helps!!!

a. 2Na+ Cl2=2NaCl is the most possible chemical reaction that can occur

Answer:

Explanation:

The question implies that the dimmer here is based on a resistor. For the dimmer to work properly, it needs to be connected to the lights in series. The total resistance of the series circuit is the sum of the resistance of

Reducing the resistance of the dimmer resistor will reduce the total resistance  of the circuit. The question states that voltage across the series circuit is "constant." There will not be a change in the voltage across the circuit. The voltage across the lights will increase but will not exceed the voltage of the power supply. The RMS voltage of power supply in the US is 120 volts. The voltage across the light will become closer to 120 volts. However, only reducing the resistance of the switch will not cause the voltage to exceed 120 volts.

[tex]\displaystyle \rm Current = \frac{Voltage}{Resistance}[/tex].

Resistance drops while voltage across the entire circuit stays the same. As a result, the current through the circuit will increase.

Current is the same for all appliances connected in series. The current in the lights will increase. Assume that the resistances of the lights stay the same,

[tex]\displaystyle \rm Power = Current^{2} \times Resistance[/tex].

Power dissipated in the lights will increase. More energy will be consumed to produce light in unit time. As a result, the lights will brighten.

I = 2A.

The easiest way to solve this problem is using Ohm's Law equation I = V/R.

The battery in the circuit is V = 24V and the resistance R = 12Ω,  to calculate the current we use the equation above:

I = 24V/12Ω = 2A

Using Ohm's law, which states that current equals voltage divided by resistance, the current in a circuit with a 24-volt battery and a 12-ohm resistance is found to be 2 amperes.

To calculate the current in a circuit with a given voltage and resistance, we can apply Ohm's law, which states that current (I) equals voltage (V) divided by resistance (R). In this case, we are given a 24-volt battery and a resistance of 12 ohms.To calculate the current in a circuit with a given voltage and resistance, we can apply Ohm's law, which states that current (I) equals voltage (V) divided by resistance (R). In this case, we are given a 24-volt battery and a resistance of 12 ohms. Using Ohm's law:

I = V / R

I = 24 V / 12 Ω

I = 2 A

Therefore, the current flowing through the circuit is 2 amperes (A).

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Answer:

D. If it has coarse grains, then it cooled slowly beneath the surface of the Earth. If it has fine grains, then it cooled rapidly on the Earth's surface.

Explanation:

The easiest way for a geologist to identify where the igneous rocks have formed is to look at their grains. There's two types of igneous rocks, intrusive and extrusive. The intrusive igneous rocks have formed from the magma that has cooled off slowly deeper into the crust, thus their crystals had more time to grown, and they have coarse grains. The extrusive igneous rocks have formed from the lava that has cooled off quickly on the surface, thus their crystals had very little time to grow, so they have fine grains.

The correct option is D. If it has coarse grains, then it cooled slowly beneath the surface of the earth. If it has fine grains, then it cooled rapidly on the earth's surface.

To understand why option D is correct, let's consider the processes of igneous rock formation and the factors that influence grain size:

 1. Intrusive (plutonic) rocks are formed from magma that cools and solidifies within the Earth's crust. This slow cooling process allows for the formation of large crystals, resulting in coarse-grained rocks. Since the cooling is slow, the mineral ions have more time to move and form larger crystals. Examples of intrusive rocks include granite and gabbro.

2. Extrusive (volcanic) rocks are formed from lava that cools and solidifies on the Earth's surface. This rapid cooling process does not allow much time for crystal growth, resulting in fine-grained or aphanitic rocks. The rapid cooling rate traps the mineral ions before they can organize into larger crystals, leading to a rock with small, barely visible crystals. Examples of extrusive rocks include basalt and rhyolite.

Therefore, the identification of the environment in which an igneous rock was formed is based on the texture of the rock, which is indicative of the cooling rate:

 - Coarse grains (phaneritic texture): The rock cooled slowly, which typically occurs beneath the Earth's surface where the surrounding rock acts as an insulator, slowing down the cooling process. This is characteristic of intrusive rocks.

 - Fine grains (aphanitic texture): The rock cooled rapidly, which typically occurs on the Earth's surface where the lava is exposed to the atmosphere or water, leading to quick heat loss. This is characteristic of extrusive rocks.

Based on this understanding, the correct identification is:

- If an igneous rock has coarse grains, it cooled slowly beneath the surface of the earth (intrusive).

- If an igneous rock has fine grains, it cooled rapidly on the earth's surface (extrusive).

 Hence, option D is the correct answer.

PRIMARY Waves Are Detected First Because They Move So Fast.

RIGHT Angles To The Direction of Movement.

A Kind Of Scale Used To Measure The Amount of Seismic Energy Released By An Earthquake RICHTER SCALE

Mixing a base with an acid results in a chemical reaction called neutralization. The result is a perfectly balanced solution of salt and water with a pH of 7 if the acid and base are balanced properly. Depending on the bases and acids used, it can be a dangerous experiment.

Neutralization reaction happens when a base is mixed with an acid. Acid neutralize the base to form the salt and water.

Acid is a chemical substance that, when dissolved in water, produces a solution with higher H+ ion activity than pure water.

A base is an aqueous material that receives protons, contributes electrons, or releases hydroxide (OH-) ions. A proton donor is an acid. A base, on the other hand, is a proton acceptor.

Acid neutralize the base to form the salt and water.

Hence, neutralization reaction happens when a base is mixed with an acid.

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The correct answer is A. Hydrogen bonding keeps water molecules close together.

Explanation:

In physics, surface tension refers to the tension that is created in the surface of liquids as a result of bonds or attraction between particles and that makes the surface layer denser than the rest of the liquid. In the case of water, this occurs due to the bonds created between the hydrogen particles with other particles in water that create a surface that is denser and flexible. This only occurs in the surface while particles in the rest of the liquid do not form these bonds. Considering this, it can be concluded water has a high surface tension because "hydrogen bonding keeps water molecules close together".

Water has a high surface tension due to two key factors:

The high surface tension of water arises primarily from the presence of hydrogen bonds between water molecules and the fact that water is a liquid at room temperature.

Hydrogen bonding occurs when the positively charged hydrogen atom in one water molecule is attracted to the negatively charged oxygen atom of another water molecule. These hydrogen bonds create cohesive forces holding the water molecules close together.

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voltage = current * resistance

so

current = voltage/resistance

therefore,

current = 6/3 A = 2 A

Answer:

tratamento de lei ohm

Explanation:

When there is direct relationship the car moves with respect to time.

The direct relationship in the graph shows that the position of the car positively changes as time elapses because there is a direct relationship between position and time.

Direct relationship means when one factor increases the other also increases whereas one decreases the other also decreases so we can conclude that when there is direct relationship the car moves with respect to time.

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Answer: Increases

This direct relationship graph shows that the position of the car

increases as time elapses.

Explanation:  got 100 percent on edge

I believe the answer is C iron...

Answer:

E) Copper

Explanation:

Copper has the strongest conductivity form the options, the greatest conductor of all is Silver, cause it has a 105% of conduction, the next one is Copper, with a 100% and the third one would be Gold with a 70%, this is measured according to the resistance that the metal creates against the electricity flow through its material.

Answer:

Gravity

Explanation:

For a space station in orbit, the centripetal force is the force of gravity.

For a child in a swing, the centripetal force is the normal force.

For a ball on a string, the centripetal force is the tension.

Answer:

Gravity

Explanation:

Gravity is one of four fundamental forces in nature. The other fundamental quantities are the electromagnetic interaction force, the weak force and the strong force. Simply put, gravity is the magnitude responsible for defining the weight of a body, being the centripetal force of orbiting objects (such as a space station, for example) and being the vertical and downward force that holds us together with the planet. Any object that moves in free fall is under the influence of gravity acceleration, which on Earth equals approximately 9.8 m / s2.

Answer:

to absorb extra light- E.

Answer:

E.

Explanation:

Curved mirrors absorb more light that the flat ones, this means that the image you're gonna get it has more information, you can see more.

That's why curved mirror are also used to vigilance in stores for example. Because allows you to see a more panoramic view due to the extra light reflection.