Which is an example of a chemical change?

energy is the ability to do work or change

Final answer:

Energy is defined as the capacity to do work or cause change, with work being a transfer of energy in the form of a force moving an object over some distance.

Explanation:

The ability to do work or cause change is called energy. When we use energy to perform tasks, such as throwing a ball or warming a house, we are actually transferring energy from one object or system to another. This transfer can occur in the form of work or heat. Specifically, work is done when a force causes matter to move against an opposing force. An example of this would be when you inflate a bicycle tire; you are doing work on the tire by moving air into it against the pressure of the air inside the tire.

In the realm of physics, work is quantified as the product of force exerted on an object and the distance the object moves as a result, which is mathematically expressed as W = F x Δx. The work-energy theorem further relates this work to changes in an object’s kinetic energy, supporting the idea that energy is essential for doing work and causing changes.

Answer:

The correct answer is the acceleration will decrease.

Explanation:

This refers to Newton's second law, where it is established that if a force acts on an object, the object accelerates in the sense of force.

And if the mass of this object is continuous, as the force increases the acceleration will grow. But if what remains constant is force, and what we increase is mass, then the acceleration will be less.

To understand it in a simpler way, let's think about horses and a carriage. The horses begin to pull hard from a carriage, whose mass will remain the same all the way. If this movement continues, then the carriage will start to go faster.

But suppose we change the mass of the carriage, adding two men of 100 kg each. The strength of the horses remains the same, and remains constant. But having a greater mass to move, the carriage will lose speed.

The correct answer is B.

Astronomers use both apparent magnitude and absolute magnitude to define how bright a star is. By way of apparent magnitude, astronomers gauge how bright the star seems from the Earth, and b way of absolute magnitude, astronomers gauge how bright the star seems from 10 parsecs/32.6 light years which is a set standard distance.

The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:

"The electrostatic force [tex]F_{E}[/tex] between two point charges [tex]q_{1}[/tex] and [tex]q_{2}[/tex] is proportional to the product of the charges and inversely proportional to the square of the distance [tex]d[/tex] that separates them, and has the direction of the line that joins them"

Mathematically this law is written as:

[tex]F_{E}= K\frac{q_{1}.q_{2}}{d^{2}}[/tex]    (1)

Where [tex]K[/tex] is a proportionality constant.

Now, if we say [tex]q_{1}[/tex] is the proton and [tex]q_{2}[/tex] is the electron, and cut the distance between them in half, the new distance will be [tex]\frac{d}{2}[/tex].

Substituting this new distance in equation (1):

[tex]F_{E}= K\frac{q_{1}.q_{2}}{(\frac{d}{2})^{2}}[/tex]   (2)

[tex]F_{E}= 4K\frac{q_{1}.q_{2}}{d^{2}}[/tex]     (3)>>>As we can see, the force becomes four times stronger

Answer:

The Answer Is C

Explanation:

False because the Ionsophere lies between the Mesosphere and the Theromsphere. If can can you give me brainliest :o ?

My guess is Wedge & Pulley

Hey i am here to help you.

A: 2 concrete blocks 6cm apart will have the least gravitational attraction to each other.

I believe that this answer was helpful.

1 hour is 3600 seconds. In 2 hours, it would be 7200 seconds.  Divide the amount of miles by seconds. 100/7200=.01388..

We don't know anything about the direction Jack was traveling, so we can't determine his velocity.  The best we can do is work with his speed.

Speed = (distance covered) / (time to cover the distance)

Speed = (100 miles) / (2 hours)

Speed = 50 miles/hour

The question has specified a different unit, so we'll need to convert the unit of our answer.  

Let's multiply the answer by (1 hour / 3600 seconds).  The numerator and denominator of this fraction are both the same quantity, so the value of the fraction is ' 1 ', and multiplying the answer by it won't change the answer in any way except the unit.

Speed = (50 mi / hr) x (1 hr / 3600 sec)

Speed = (50mi · 1hr)  /  (hr · 3600sec)

Speed = 50 mi / 3600 sec

Speed = 0.01389 mi/sec

Answer:

[tex]4.5\cdot 10^9 N[/tex]

Explanation:

The electric force between two charged objects is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where:

k is the Coulomb's constant

q1 and q2 are the charges of the two objects

r is their separation

In this problem:

q1 = 2.0 C

q2 = 1.0 C

r = 2 m

So, the electric force is

[tex]F=(9\cdot 10^9 Nm^2C^{-2})\frac{(2.0 C)(1.0 C)}{(2 m)^2}=4.5\cdot 10^9 N[/tex]

6. The magnitude of the force that the 2 C object exerts on the 1 C object is 4.495 * 10^9 N. Option C is the right choice.

7. Only increasing the combined charge of both spheres increases the electrical force between them. Option C is the right choice.

6.  

The force between two charged objects is given by Coulomb's law:

F = k * |q1 * q2| / r^2

where:

F is the force between the two charges

k is Coulomb's constant, approximately equal to 8.99 * 10^9 N⋅m^2/C^2

q1 and q2 are the magnitudes of the charges of the two objects

r is the distance between the two objects

In this case, q1 = 2.0 C, q2 = 1.0 C, and r = 2 meters. Plugging these values into Coulomb's law, we get:

F = 8.99 * 10^9 N⋅m^2/C^2 * |2.0 C * 1.0 C| / (2 meters)^2

F = 4.495 * 10^9 N

So the answer is Option C. 4.495 * 10^9N.

7.

The electrical force between two charged spheres depends on the magnitude of their charges and the distance between them, as described by Coulomb's Law.

Increasing the combined mass of the spheres, the diameter of one sphere, or the distance between them has no effect on the force.

Therefore, the only option that increases the force is to increase the combined charge of both spheres. Option C is the right choice.

false 99.8% sure i looked it up so i believe thats it

The statement is false. For a fixed mass, gold, which is denser than aluminium, will have a smaller volume.

The statement that 1kg of gold will have seven times the volume of 1kg of aluminium is false. The volume of a material is derived from its mass and its density. Specifically, volume equals mass divided by density. The density of gold is about 19.3 g/cm³ while the density of aluminium is about 2.7 g/cm³. Hence, for a given mass, gold will have a smaller volume than aluminium. The intuitive reason for this is that gold is denser than aluminium - it has more mass packed into the same volume.

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18.9 but round it and you get 19

In this case if given those choices your answer would be (C. 19).

However in more complicated Chemistry rules you would learn that the periodic table only showcases 1 of the many possible masses of the element.

Hope this help! :D  

Pyramid of numbers: relative number of individual organisms at each trophic level in an ecosystem. Pyramids of energy show the relative amount of energy available at each trophic level. On average, about 10 percent of the energy available within one trophic level is transferred to the next trophic level.

HOPE THIS HELPED!!! XD

Represents a:

A Trophic Level

The point with the greatest potential energy is B.

The potential energy of an object is depends on the relative distance between the object and the ground and its mass. The higher the object is from the ground the greater the potential energy posses.

Potential energy (P.E) = mgh

Where m is the mass, g is the gravity and h is the height from the ground to where the object is.

Since the mass and gravity is constant in this case, only the height will determine the point with the greatest P.E and that point is B.

input force and output force

Answer:

input force and output force

Answer:

[tex]96 m/s^2[/tex]

Explanation:

Centripetal acceleration is given by:

[tex]a_c = \omega^2 r[/tex]

where

[tex]\omega[/tex] is the angular frequency

r is the radius of the trajectory

In fan completes 2 rotations every second, so its frequency is

[tex]f=\frac{2}{1.0 s}=2 Hz[/tex]

And the angular frequency is

[tex]\omega=2\pi f=2\pi(2 Hz)=12.6 rad/s[/tex]

The radius of the trajectory is

r = 0.61 m

So, the centripetal acceleration is

[tex]a=(12.6 rad/s)^2 (0.61 m)=96.8 m/s^2 \sim 96 m/s^2[/tex]

Answer:

the amygdala, the prefrontal cortex, the cingulate cortex, the hippocampus, and the basal ganglia

Explanation:

These are the regions of the brain that read emotions

(not sure if i answered correctly  but i tried. )

An example of the emotional brain at work is the activation of the amygdala during stress, which can trigger a fight-or-flight response. Emotional intelligence involves managing these reactions to make balanced decisions, highlighting the intertwined nature of emotion and rational thought in our cognitive processes.

An example of the emotional brain at work can be seen when you react to a stressor, such as an argument with a friend. In this situation, your amygdala, a part of the limbic system, gets activated. The amygdala processes emotional responses and is known for its role in fear and other emotions. It sends a distress signal to the hypothalamus, which can trigger a fight-or-flight response, involving the release of stress hormones and activation of the sympathetic nervous system.

This reaction is not always rational and can sometimes be too quick, bypassing logical thought processes. However, emotional intelligence at work involves recognizing these emotional responses, understanding their impact, and managing them effectively to make balanced decisions. As research suggests, emotions are integral to rational thinking, and a lack of emotional response due to brain injury can make decision-making difficult and lead to significant life issues.

Answer:

B. Encoding

Explanation:

Encoding is the processing of information and input into memory.

The processing of information and other input into your memory is called encoding. Encoding is the input of information into the memory system. It involves labeling or coding sensory information and connecting new concepts to existing concepts. Encoding can occur through automatic processing or effortful processing.

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Answer:

The answer is B. It is the one that has the triangle pointing up on the topside of the rope and seems to be a bit bigger than the other triangles.

Explanation:

Answer:

The second option with a vertex pointing upwards.

Explanation:

A wave is a disturbance that can be transmitted through a medium without causing a permanent displacement of the particles of the medium. The two types are; longitudinal and transverse.

In transverse wave, the direction of propagation of the wave is perpendicular to the direction of vibration of the particles of the medium. Examples are; water waves, light waves, X-ray etc. While in longitudinal waves, the direction of vibration of the particles is parallel to the direction of propagation of the waves. Examples are; waves in a slinky, waves in a rope, sound waves etc.

A wave in a rope is a form of longitudinal waves. When two wave pulses move toward each other, interference is observed.

Delta means change usually

Answer: A) Change in velocity

Explanation:

USA test prep

answer would be A becuz that's the only reasonable choice according to real life situations

The best hypothesis for this experiment is that if I increase the pressure outside an air-filled balloon, then the balloon will become smaller. Hence, option (a) is correct.

The force perpendicularly applied to an object's surface divided by the area over that it is dispersed is known as pressure. The pressure as compared with the surrounding air pressure is referred as gauge pressure.

To express pressure, a variety of measures are employed. Some of these come by dividing a unit of force by a unit of area; for instance, the SI unit of pressure, the pascal (Pa), is equivalent to one newton per square meter (N/m2), whereas the conventional unit of pressure in the metric and U.S. conventional systems is the pound-force per square inch (psi).

To know more about Pressure:

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The most destructive kind of mass movement a landslide.

Landslide is the most destructive kind of mass movement.

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It varies with the total volume of the fluid.

Answer:

56.9 fN

Explanation:

The force exerted on the electron is:

[tex]F=Bqv[/tex]

where

B is the magnetic field strength

q is the electron's charged

v is the speed of the electron

In our problem,

B = 0.049 T

[tex]q=1.6\cdot 10^{-19} C[/tex]

[tex]v=7.26\cdot 10^6 m/s[/tex]

Therefore, the force is

[tex]F=(0.049 T)(1.6\cdot 10^{-19} C)(7.26\cdot 10^6 m/s)=5.69\cdot 10^{-14} N=56.9 fN[/tex]

Kinetic energy

A car engine changes chemical potential energy into the kinetic energy of the moving car​.

the correct answer A                                                  

Hello, the answer is d. A

Best regards

Answer: D. A glass pane

Explanation: Glass is a poor conductor of electricity. Aluminum, copper and silver are all good conductors of electricity.

A pane of glass can be used as an insulator against electric current because it is a poor conductor of heat.

Glass is made up of silica which is abundant in nature.

At the player's maximum height, their velocity is 0. Recall that

[tex]{v_f}^2-{v_i}^2=2a\Delta y[/tex]

which tells us the player's initial velocity [tex]v_i[/tex] is

[tex]0^2-{v_i}^2=-2g(0.65\,\mathrm m)\implies v_i=3.6\dfrac{\rm m}{\rm s}[/tex]

The player's height at time [tex]t[/tex] is given by

[tex]y=v_it-\dfrac g2t^2[/tex]

so we find their airtime to be

[tex]0.65\,\mathrm m=\left(3.6\dfrac{\rm m}{\rm s}\right)t-\dfrac g2t^2\implies t=0.36\,\mathrm s[/tex]

Answer:

the one right behind 600 and the one in between 600 and 700

Explanation:

Final answer:

Scientists determine the presence of elements in the stars' atmospheres by analyzing their atomic spectra, which are obtained by spreading out the light emitted by stars into a spectrum using a spectrograph. The spectrum shows dark lines or absorption lines that indicate the presence of specific chemical elements.

Explanation:

Scientists determine what elements are present in distant stars by analyzing the light that comes from stars and finding the atomic spectrum of elements in that light. By using a spectrograph to spread out the light into a spectrum, scientists can observe the presence of elements in the stars' atmospheres. The spectrum shows dark lines or absorption lines that are produced by atoms in the atmospheres of stars and absorb light at certain wavelengths, providing evidence of the presence of specific chemical elements.

For the ball to go straight into the goal, the kicker needs to be no more than 6.54 meters away from the goal.

For the ball to arc into the goal, the kicker needs to be between 58.5 and 65.1 meters away from the goal.

How long does it take for the ball to reach the goal?

Let the distance between the kicker and the goal be [tex]x[/tex] meters.

Horizontal velocity of the ball will always be [tex]26.2\times\cos{34.2\textdegree}[/tex] until it lands if there's no air resistance.

The ball will arrive at the goal in [tex]\displaystyle \frac{x}{26.2\times\cos{34.2\textdegree}}[/tex] seconds after it leaves the kicker.

What will be the height of the ball when it reaches the goal?

Consider the equation

[tex]\displaystyle h(t) = -\frac{1}{2}\cdot g\cdot t^{2} + v_{0,\;\text{vertical}} \cdot t + h_0[/tex].

For this soccer ball:

[tex]\displaystyle t=\frac{x}{26.2\times\cos{34.2\textdegree}}[/tex]

when the ball reaches the goal.

[tex]\displaystyle h= - 9.81 \times \frac{x^2}{(26.2\times\cos{34.2\textdegree})^2} + (26.2 \times \sin{34.2\textdegree})\times\frac{x}{26.2\times\cos{34.2\textdegree}} \\\phantom{h} = -\frac{9.81}{(26.2\times\cos{34.2\textdegree})^2}\cdot x^{2} + \frac{\sin{34.2\textdegree}}{\cos{34.2\textdegree}}\cdot x[/tex].

Solve this quadratic equation for [tex]x[/tex], [tex]x > 0[/tex].

In other words,

Answer:

A satellite orbiting the Earth

Explanation:

Kinetic energy is the intrinsic energy possessed by an object in motion.  The bigger the object in motion, and the higher its speed , the higher the kinetic energy. The equation below is used to calculate this energy also referred to as the work put into the object to accelerate it into its current velocity.

E(k) = 1/2 * m * v²

The best example of kinetic energy in the options provided is 'A satellite orbiting the Earth'. Kinetic energy specifically refers to the energy possessed by an object in motion, such as a satellite that is constantly moving in its orbit around the Earth.

The best example of kinetic energy among the given options is: 'A satellite orbiting the Earth'. Kinetic energy is the energy of motion. Therefore, any object in motion possesses kinetic energy. The satellite orbiting the Earth is in constant motion; thus, it has kinetic energy. The other examples like a book sitting on a bookshelf, a golfer preparing to putt the ball, and a race car in position at the start line are instances of potential energy or energy that is stored and has the capability to do work but isn't actively doing so.

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