1. What are the approximate calorie needs of a
sedentary 16 year old male?
A. 1.800 calories C. 2,200 calories
B 2.000 calories D. 2,400 calories

Answer:

A power supply, wiring as a conductor.  A switch controls current flow into a circuit.

Explanation:

please give brainliest

Answer:

Magnetic Domain, Magnetic Pole, Magnetic Field, and Ferromagnetic Material

Explanation: I just got 100 in my assigment

A cluster of atoms whose magnetic fields are aligned in the same direction is Magnetic Domain.

The end of a magnet where the force is the strongest is the Magnetic Pole.

The region where a magnetic force is exerted is the Magnetic Field.

A substance that is easily magnetized is a Ferromagnetic Material.

The magnetic field is the region of space where a charged object experiences magnetic force when it is moving.

When the atoms of an object having magnetic field in same direction is called magnetic domain.

When a charged object moves in the magnetic field of other object, the magnetic force is experienced.

The pole is the point where the magnetic force is maximum. Bar magnets has two poles.

A substance which is easily magnetized is the ferromagnetic material.

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When a rock and water are heated by the sun, the rock's temperature rises faster due to its lower specific heat capacity compared to water, which requires more energy to increase in temperature. Additionally, energy is also used for water evaporation, and higher thermal conductivity in water distributes the heat over a larger area.

When a large rock and a container of water receive the same amount of heat energy from the sun, the temperature of the rock will rise faster than that of the water. This is because rock (or sand) and water have different specific heat capacities. The specific heat capacity is the amount of heat per unit mass required to raise the temperature by one degree Celsius. Sand and rocks have a lower specific heat capacity compared to water, meaning they need less energy to increase in temperature. Conversely, water, with a higher specific heat capacity, requires more energy to raise its temperature, so it heats up more slowly.

Additionally, when sunlight hits the Earth's surface, the energy is not just used for heating. In the case of water, some energy is used for evaporation, further reducing the amount of energy that goes into heating the water compared to rock. Lastly, the thermal conductivity of water is higher, which allows the energy absorbed to be transferred throughout the water, distributing the heat over a larger area and therefore taking longer for the temperature to rise.

Therefore, when both a rock and water are exposed to the same amount of sunlight, the temperature of the rock will likely increase more rapidly than that of water. This phenomenon explains why land areas heat up more quickly during the day compared to bodies of water.

Answer:

-magnesium and silicon

Explanation:

The two elements that will most likely form an ionic bond are magnesium and silicon. The correct option is b.

Ionic bonds are defined as those that are created when all of an atom's electrons completely transfer to another atom. Ionic compounds are those that contain ionic bonding.

The atom losing electrons in this bond formation is referred to as an electromotive atom, while the atom acquiring electrons is referred to as an electronegative atom.

In these compounds, ions with opposing charges are drawn to one another and combine to form a compound. Magnesium and silicon form a crystalline compound that is black, and these elements can form ionic bonds. The formula of magnesium and silicon is MgO₃Si

Therefore, the correct option is b, magnesium, and silicon.

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The relationship between the frequency, wavelength & wave speed should be explained below.

Here the wave speed represents the distance where the wave should be traveled in the given value of time like the no of meters it travels per second. Also, the speed of the wave should be related to the length of the wave. Also, the equation of the wave frequency should be  Speed = Wavelength * Frequency. In this, all three things should be interlinked with each other.

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Answer:

Momentum of the bowling pin is 17kgm/s

Explanation:

P(initial of ball)=+30 kg m/s

P(initial of pin)=0  because its velocity is 0

P initial = P final

30= P(ball) + P(pin)

30=13+P(pin)

P(final of pin)=+13 kg m/s and P(final of ball)= 30-13=17kgm/s

The scenario involves conservation of momentum. The bowling ball transfers momentum to the pin during collision, and the final momentum of the bowling pin is calculated to be 17 kg m/s.

The scenario described in the question involves the principle of conservation of momentum. This principle, fundamental in physics, states that the total momentum of a system of objects is constant unless acted upon by an external force. Thus, the total momentum before the collision (initial momentum of the bowling ball) should equal the total momentum after the collision (final momentum of the bowling ball plus the momentum of the pin).

Given that the bowling ball has an initial momentum of +30 kg m/s and final momentum of +13 kg m/s, the momentum transferred to the pin is 30 kg m/s - 13 kg m/s = 17 kg m/s. This is the magnitude of the final momentum of the bowling pin.

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Yes, the statement is true. When a train is slowing down, it's experiencing a form of acceleration known as negative acceleration or deceleration.

That's a great question about the concept of acceleration. The answer is True. Acceleration in Physics is defined as the rate of change of velocity per unit of time. This change in velocity could be either an increase (speeding up) or a decrease (slowing down). When a train is slowing down, it's indeed undergoing a type of acceleration called deceleration, which is a negative acceleration.

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When a train is slowing down, it is indeed accelerating, but in a negative direction. This is known as deceleration, and while it means the object is slowing down, it is technically still considered acceleration in physics.

The statement is true; when a train is slowing down, it is indeed accelerating - but in a negative direction. Acceleration, in physics, is a change in velocity, which includes either a change in its magnitude or direction. When the train slows down, the change in velocity is negative, and we refer to this as negative acceleration or deceleration. Even though the term 'deceleration' can sometimes cause confusion, from a physics standpoint, it's still considered acceleration because acceleration is a vector and has a direction associated with it.

As an example, let's take a look at a train moving with an initial velocity of 20 m/s. After some time, its speed drops to 10 m/s. Here, there's a negative change in velocity, so the acceleration will also be negative.

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Answer:false

Explanation:

Atoms don’t always fission the same way. You saw three different possible fission reactions for U-235

Answer: F

Explanation:

Answer:

Wavelength, [tex]\lambda=2.94\ m[/tex]

Explanation:

It is given that,

Speed of radio waves is [tex]v=3\times 10^8\ m/s[/tex]

Frequency of radio waves is f = 101,700,000 Hz

We need to find the wavelength of WFNX’s radio waves. The relation between wavelength, frequency and speed of a wave is given by :

[tex]v=f\lambda[/tex]

[tex]\lambda[/tex] is wavelength

[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{3\times 10^8}{101,700,000}\\\\\lambda=2.94\ m[/tex]

So, the wavelength of WFNX’s radio waves is 2.94 m.

The wavelength of WFNX’s radio waves with the given speed and frequency is 2.95m.

Given data in the question;

wavelength; [tex]\lambda =\ ?[/tex]

To determine the wavelength of the radio wave, we use the expression for the relations between wavelength, frequency and speed.

[tex]\lambda = \frac{c}{f}[/tex]

Where [tex]\lambda[/tex] is wavelength, f is frequency and c is the speed.

We substitute our given values into the equation

[tex]\lambda = \frac{3*10^8m/s}{1.017*10^8s^{-1}}\\\\\lambda = 2.95m[/tex]

Therefore, the wavelength of WFNX’s radio waves with the given speed and frequency is 2.95m.

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The graph that correctly describes the car's acceleration as a function of time is (c).

The graph that correctly describes the car's acceleration as a function of time is (c). In this graph, the acceleration has a constant value for a certain time interval, indicating constant acceleration. The slope of the velocity vs. time graph is constant during this interval.

The moon orbiting the earth, an apple falling, or a car stopping at a traffic light are a few instances of acceleration. These illustrations help us to understand that acceleration happens when a moving object changes direction or experiences a speed increase or reduction.

The acceleration unit in the SI is metres/second2 (m/s2). Newton's Second Law, which states that "The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass," establishes a relationship between force (F), mass (m), and acceleration (g).

Explanation:

The darker the object, the better it emits heat, because it's a better absorber of light. On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light.

Answer: Absorption

Explanation: Because the darker clothing absorbs the heat more than the lighter clothing beacuse of contrast i guess . A P E X

Answer:

57.91

Explanation:

The electric potential energy between the two charges is approximately 57.75 Joules.

To calculate the electric potential energy between two point charges, we can use the formula:

Electric potential energy (U) = k * |q1 * q2| / r

where:

k is Coulomb's constant ≈ 8.99 * [tex]10^9[/tex] N m²/C²

q1 and q2 are the magnitudes of the two charges (in Coulombs)

r is the distance between the charges (in meters)

Given:

q1 = 4.33 * [tex]10^(-6)[/tex] C

q2 = -7.81 * [tex]10^(-4)[/tex] C

r = 0.525 m

Now, let's calculate the electric potential energy (U):

U = (8.99 * [tex]10^9[/tex]  N m²/C²) * |(4.33  * [tex]10^(-6)[/tex]C) * (-7.81 * [tex]10^(-4)[/tex] C)| / 0.525 m

U = (8.99 * [tex]10^9[/tex]  N m²/C²) * |(-3.38 * [tex]10^(-9)[/tex] C²)| / 0.525 m

U = (8.99 * [tex]10^9[/tex]  N m²/C²) * 3.38 * [tex]10^(-9)[/tex] C² / 0.525 m

U = (3.03362 * [tex]10^1[/tex] N m²/C²) / 0.525 m

U ≈ 57.75 J

The electric potential energy between the two charges is approximately 57.75 Joules.

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Answer:

C. Reflection of the wave with the same wave speed

Explanation:

Reflection occurs when waves bounce back from a surface they cannot pass through.

Reflection can happen with any type of waves, not just sound waves. For example, light waves can also be reflected. In fact, that’s how we see most objects. Light from a light source, such as the sun or a light bulb, shines on the object and some of the light is reflected. When the reflected light enters our eyes, we can see the object.

Reflected waves have the same speed and frequency as the original waves before they were reflected. However, the direction of the reflected waves is different. When waves strike an obstacle head on, the reflected waves bounce straight back in the direction they came from. When waves strike an obstacle at any other angle, they bounce back at the same angle but in a different direction.

When a wave encounters a non-transmitting barrier, it undergoes C. reflection with the same wave speed.

Reflection is the process by which light, sound, or other waves bounce back when they encounter a boundary or obstacle. It's a fundamental phenomenon in physics and optics, used in mirrors, echo formation, and various technologies like radar and sonar for detection and imaging.

When a wave encounters a non-transmitting barrier, the phenomenon that occurs is a reflection of the wave with the same wave speed. This means that the wave bounces back off the barrier and continues moving at the same speed. The direction of the reflected wave depends on the angle at which the original wave hits the barrier, following the law of reflection.

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Answer:

Electromagnetism has important scientific and technological applications. It is used in many electrical appliances to generate desired magnetic fields. It is even used in a electric generator to produce magnetic fields for electromagnetic induction to occur. It has many more technological applications including MRI scanning (magnetic resonance imaging) and electric bells.

Explanation:

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.

Answer:

200 N to the left

Explanation:

If we say left is negative and right is positive, then the net force is:

∑F = -300 N + 100 N

∑F = -200 N

The net force is 200 N to the left.

Answer:

c. trillions of cells

Explanation:

Every animal has trillions of cells to function

The majority of animals have millions of cells, while various species have varying quantities. For example, there are more than 40 trillion cells in an adult human. Thus option C is correct.

The animal body contains a variety of cell kinds. Skin cells, muscle cells, blood cells, fat cells, nerve cells, sex cells, and stem cells are a few examples of common animal cell types.

Skin or epithelial tissue is composed of skin cells. The cells that make up muscular tissue are referred to as  muscle cells.

All animals have numerous cells that work together to build the entire organism because they are multicellular. These cells in more complex species, like humans, may be highly specialized to carry out various tasks.

The lion, like all mammals and other creatures, is formed of eukaryotic cells, which contain DNA, ribosomes, and cytoplasm in addition to many other organelles.

Therefore, A large animal, such as a lion is made of trillions of cells.

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Answer:

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.

Explanation:

Mechanical wave used to describe the compression of a longitudal wave.

Mechanical waves are longitudinal waves that generate compressions along the medium they are travelling and transmit energy from one medium to another location of medium.

Therefore, Mechanical wave used to describe the compression of a longitudal wave.

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Answer:

B

Explanation:

Answer:

Reduce the time required for work

Explanation:

A chisel, an axe, and a knife all include wedges in their design, as they have tapered edges that are used to cut, split, or pierce materials. A hairbrush does not serve this function and is not a wedge.

A wedge is a simple machine that consists of a piece of material, typically metal or wood, with a sharp edge that tapers to a point or edge. It converts force applied to its blunt end into forces perpendicular to its inclined surfaces. The wedge is used to cut, split, or pierce other objects or materials. Based on the information provided:

Examples of other non-listed tools that function as wedges could include a screwdriver for opening cans, a garden fork for piercing soil, or a pair of pliers for gripping and cutting.

Answer:

They all burn fossil fuel is the correct answer.

Explanation:

Cars, power plants, and furnaces all burn fossil fuels such as coal, natural gas, heavy oils, petroleum, oil.

Burning of these fossil fuels results in a release of a huge amount of carbon dioxide and sulfur dioxide gas, into the surrounding that causes air pollution, global warming, acid rain, and these gases present in the environment are highly corrosives and makes suffocating in the environment.

Cars, power plants, and furnaces all run on the process of combustion where chemical energy is transformed into heat and mechanical energy, often using fossil fuels.

Cars, power plants and furnaces all share a common mechanism - they convert chemical energy into heat and mechanical energy. This process is known as combustion. Fossil fuels such as coal, oil, or natural gas are commonly used in these devices. During combustion, chemical reactions occur that release energy in the form of heat. The heat produced can be used directly, as in a furnace, or to do work, like turning the wheels of a car or generating electricity in a power plant.

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Answer:

A. Light can travel trough air and space.

Explanation:

A vacuum is space that has no air inside of it. Since light is able to go through 'nothing' and matter, your answer must be A.

Answer:

A) Both water and a vacuum

Explanation:

Sound is a mechanical wave that requires a medium such as air or water to travel through. A laser on the other hand can travel through some mediums and vacuum.  

Answer: C.

Water flowing through pipes

Explanation:

Convection current is a type of heat transfer that occurs in liquids and gases.

It involves the physical movements of liquids or gases molecules. Convection happens when there is a difference in temperature between two parts of a liquid or gas. In convention, hot part of a fluid rises, and the cooler part sinks

Answer:

C

Explanation:

Answer:d

Explanation:

A chemical reaction occurs when 2 white solids are stirred together. They turn into a slushy, white solid and the glass jar feels really cold. Energy is being Absorbed by the solids, which means this is an Endothermic reaction. Hence option B is correct.

Endothermic reaction is a reaction in which energy is absorbed from the surrounding in the form of heat. for example an ice cube takes energy from the surrounding and it melts to form liquid. In this melting of Ice energy is absorbed in the form of heat. In this process the phenomenon is going from high order(solid) to lower order(liquid), hence entropy is increasing in this case. Entropy is nothing but randomness of molecule.

Because of absorption of energy, change in enthalpy is negative.

Exothermic reaction is a reaction in which energy is released in the surrounding in the form of heat.  for example bursting of firecracker gives sound and heat energy and its temperature is greater than surrounding. In this process Energy is released in the surrounding. In this case entropy decreases( solidifying of water into ice is also example of endothermic reaction).

Because of release of energy, change in enthalpy is positive.

Hence option B is correct.

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Answer:

C. A transistor

Explanation:

A device that is similar to a sandwich that has layers of semiconductor is known as the transistor. Hence, option C is correct.

A transistor is a semiconductor signal-generating, regulating, and amplifying device. Integrated circuits, or "microchips," which frequently have billions of these tiny components etched onto their glossy surfaces, use transistors as their active parts.

Transistors, which are present in practically every electronic component, have evolved into the brain cells of the age of information.

The emitter, collector, and base—or, in more recent electrical applications, the source, drain, and gate—are the three electrical leads that commonly make up a transistor.

The ability of the semiconductor material to conduct electric charge, which in most applications moves here between emitter (or sources) and collector (or drain), is influenced by an electrical signal supplied to the bases (or gate).

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Answer:

The electric current running into the light bulb is 0.5 A.

Explanation:

We have,

Power rating on a light bulb is 60 W

It is required to find the current running into it if it is plugged into a 120 V outlet. Let I is the electric current. The mathematical definition of power is given by :

[tex]P=VI[/tex]

I is electric current

[tex]I=\dfrac{P}{V}\\\\I=\dfrac{60}{120}\\\\I=0.5\ A[/tex]

So, the electric current running into the light bulb is 0.5 A.

Answer:

25N.s=25kgm/s

Explanation:

The resulting momentum in this case is equal to the impulse created by the force 5N during 5 seconds

ΔP=Force.time=F.t

    = 5x5=25kgm/s

Answer:

i might be wrong but i think its

FALSE srry if im wrong TwT

Explanation:

The statement is false; temperature measures the average kinetic energy of gas molecules, whereas pressure is related to the force and frequency of collisions against the container's walls.

The statement that the temperature of a gas is a measure of how hard its molecules hit the walls of its container is false. Instead, the temperature of a gas is proportional to the average translational kinetic energy of the gas molecules.

When the kinetic energy increases, the molecules move faster, which could lead to harder impacts and more frequent collisions with the walls of the container, but the temperature itself does not directly measure impact force. Conversely, pressure of a gas is related to the frequency and force of the molecules colliding with the container walls. The more collisions and the harder they are, the higher the pressure. These collisions are the resultants of the gases’ kinetic energy and the volume available for the gas molecules to move around.

Answer:

flow of electric charges - current

opposition to the flow of an electric current - resistence

stored potential energy at the source of a circuit - voltag