There is a repulsive force between two charged objects when

Answers

Answer 1
Answer: Both objects have charges of the same sign

When two electrically charged bodies come closer, appears a force that attracts or repels them, depending on the sign of the charges of this two bodies.

This is stated by Coulomb's Law:

"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]

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

Now, if [tex]q_{1}[/tex] and [tex]q_{2}[/tex] have the same sign charge (both positive or both negative), a repulsive force will act on these charges.


Related Questions

How does the average speed of light in glass compare with its speed in a vacuum?

Answers

Answer:

the speed of light in glass is 1.52 times smaller than in a vacuum

Explanation:

The speed of light in a medium is given by:

[tex]v=\frac{c}{n}[/tex]

where

c is the speed of light in a vacuum

n is the refractive index of the medium, which is a number always greater than 1.0

From the formula, we see therefore that when light enters a medium, its speed decreases.

In particular, for glass the index of refraction is

n = 1.52

Therefore, this means that the speed of light in glass is 1.52 times smaller than in a vacuum.

Acceleration is defined as the change in velocity divided by

Answers

Answer:

Time elapsed

Explanation:

Acceleration is a vector quantity. It is defined as:

[tex]a=\frac{v-u}{t}[/tex]

where

v is the final velocity

u is the initial velocity

t is the time elapsed

Acceleration is measured in meters per second squared (m/s^2). It must be noticed that acceleration is a vector, so it also has a direction. In particular:

- when acceleration is negative, it means that the object is slowing down, so acceleration is in opposite direction to the velocity

- when acceleration is positive, it means that the object is speeding up, so acceleration is in the same direction as the velocity

Final answer:

Acceleration is the rate of change in velocity over a time period. It is a vector with direction and magnitude and is measured in m/s². The average acceleration is calculated by the formula 'change in velocity ÷ time interval'.

Explanation:

Acceleration is defined as the change in velocity divided by the time period during which this change occurs. It is the rate at which velocity changes, represented by the formula 'average acceleration = change in velocity ÷ time interval' over which it changed. This concept can be understood well with a velocity versus time graph, where the slope represents acceleration. Namely, slope = change in velocity ÷ change in time.

Acceleration is a vector, indicating it possesses both magnitude and direction. It is measured in SI units as meters per second squared or m/s², indicating how velocity changes every second. Thus, acceleration can occur due to a change in speed (magnitude of velocity), change in direction, or both.

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explain how forces of attraction and repulsion exist within an atom

Answers

Answer:

Oppositely charged particles attract each other, while like particles repel one another. Electrons are kept in the orbit around the nucleus by the electromagnetic force, because the nucleus in the center of the atom is positively charged and attracts the negatively charged electrons.

Explanation:

Answer:

There are three kinds of forces within the atom:

      i) Electromagnetic force of attraction between the electrons and protons  

      ii) Electromagnetic force of repulsion between the protons or weak nuclear force  

      iii) Strong nuclear force between the electrons and protons

Explanation:

Electromagnetic force of attraction:

Electrons revolve in the orbits outside the nucleus. There exists an electromagnetic force of attraction between the electrons and protons. That’s why, electrons do not leave the atom.

Weak nuclear force:

It is an electromagnetic force of repulsion between the protons in the nucleus of the atoms.

Strong nuclear force:

This force is strongest from all the fundamentals forces and exists between the protons and neutrons in the nucleus of atom. This force overcomes the weak nuclear force and does not allow protons to stray away.  

which best demonstrates friction
A)an iceskater sliding across the ice without noticeably slowing down
B)a car rolling to a stop at a traffic light
C)a baseball moving in a projectile motion
D)the free fall of astronauts in orbit

Answers

Answer:

B!

Explanation:

(I suck at explaining things) Basically the car has friction with the road as it slows to a stop.

The option that best demonstrates friction is a car rolling to a stop at a traffic light. Thus, the correct option for this question is B.

What is Friction?

Friction may be defined as a type of force that significantly resists or opposes the relative motion between two surfaces of objects when they come in direct contact with each other. In a more simple sense, friction is characterized as the rubbing of one body over the surface of another.

Option C and option D do not involve the contact of one body with the surface of another. So, both these options are eliminated. In option A, an ice skater slides across the ice, but it is not noticeably slowing down, so friction is zero.

Therefore, the option that best demonstrates friction is a car rolling to a stop at a traffic light. Thus, the correct option for this question is B.

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A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?

Answers

Answer:

10 kg m/s

Explanation:

According to the law of conservation of momentum, the total momentum before the collision must be equal to the total momentum after the collision. So, we can simply calculate the total momentum before the collision.

The two balls are moving in perpendicular directions - one eastward and one northward. If we take eastward as positive x-direction and northward as positive y-direction, this means that we can find the magnitude of the total momentum by simply using Pythagorean theorem.

The magnitude of the momentum of the ball travelling eastward is:

[tex]p_1 = m_1 v_1 = (2.0 kg)(3.0 m/s)=6.0 kg m/s[/tex]

The magnitude of the momentum of the ball travelling northward is:

[tex]p_2 = m_2 v_2 = (4.0 kg)(2.0 m/s)=8.0 kg m/s[/tex]

So the magnitude of the total momentum is:

[tex]p=\sqrt{p_1^2 +p_2^2}=\sqrt{(6.0)^2+(8.0)^2}=10kg m/s[/tex]

In an elastic collision, kinetic energy is transferred from one particle to another, but the total kinetic energy remains constant. question 1 options:

a. True

b. False

Answers

The answer is A, hope this helps

Final answer:

The statement about elastic collisions conserving total kinetic energy is true. Elastic collisions maintain kinetic energy, whereas inelastic collisions do not. In elastic collisions, kinetic energy may temporarily change forms but is ultimately conserved.

Explanation:

The statement, “In an elastic collision, kinetic energy is transferred from one particle to another, but the total kinetic energy remains constant,” is true. An elastic collision is a type of collision in which no kinetic energy is lost. The total kinetic energy before and after the collision is the same. Although kinetic energy may be transferred between the colliding objects, it is not lost to other forms of energy like thermal or sound energy. A contrasting situation occurs in an inelastic collision, where kinetic energy is not conserved and can be transformed into other forms of energy.

In an elastic collision, even if viewed from different reference frames, such as one where a particle is initially stationary, the total kinetic energy of the system after the collision is equal to the total kinetic energy before the collision. However, during the moment of impact, some kinetic energy may be temporarily stored as elastic potential energy, which then is converted back to kinetic energy as the objects move apart. Hence, the phrase “recovered” is sometimes preferred over “conserved” to describe the kinetic energy in elastic collisions.

In an electrical circuit, what subatomic particles are traveling along the conduit? a. Protons

b. Neutrons

c. Quirks

d. Electrons

Answers

In any electrical circuit where current is flowing, Electrons are the particles that are doing the flowing.  (d)

The property of matter that resists changes in motion is called

Answers

intertia hope that helps

What are the three subatomic particles that make up an atom

Answers

Neutron electron and proton, I’m pretty sure

Answer:

Neutrons, Protons, and Electrons :)

Explanation:

Due tomorrow pls help.
Review the properties of meters used in electric circuits by placing an X in the correct column.

Answers

Answer:

Ammeter:

- measures current

-connected in series

-measurement expressed in amperes

-measures the amount of charge per second passing through

The rest is for voltmeter

Explanation:

Properties of an Ammeter:

Measures current.Connected in series.Measurement expressed in amperes.Measures the amount of charge per second passing through.

Properties of a Voltmeter:

Measures potential difference.Connected in parallel.Measurement expressed in volts.Measures the change in energy per unit charge between two points.

What is an Ammeter?An ammeter is a device which used to measure the electric current in a circuit.The SI unit of electric current is Amperes (A).The ammeter is usually connected in series to measure the current. An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured.

What is Voltmeter?A voltmeter is a device which used for measure the electric potential difference between two points in an electric circuit.It is connected in parallel.The SI unit of potential difference or voltage is Volts (V).It usually has a high resistance so that it takes negligible current from the circuit.

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Dark mass or dark matter in our galaxy was discovered from much _____ velocities of stars at _____ distances from the galactic center.

Answers

Answer:

Dark mass or dark matter in our galaxy was discovered from much higher velocities of stars at long distances from the galactic center.

Explanation:

Dark matter is a type of matter, whose composition is unknown and which corresponds to 80% of the matter in the universe. Its name refers to the fact it does not emit or interact with any type of electromagnetic radiation, being completely transparent throughout the electromagnetic spectrum.  

However, it interacts with the known matter through gravity.  

In this sense, it is believed that in our galaxy, the Milky Way, has a great amount of dark matter in  comparison with ordinary matter (known visible matter). Because, like gravity, dark matter can not be observed directly, however its existence is inferred through the movement of the stars and the cosmic dust within the galaxy at zones where is supose there is no matter.

Final answer:

Dark matter was deduced from the high velocities of stars at large distances from the galactic center, which indicated more mass than could be accounted for by visible matter alone.

Explanation:

Dark mass or dark matter in our galaxy was discovered from the much higher-than-expected velocities of stars at great distances from the galactic center. This puzzling phenomenon was first noted by Fritz Zwicky in the 1930s and further studied by Vera Rubin. While the mass of a galaxy was expected to be concentrated at its center, the stars' velocities didn't decrease as anticipated with the square root of the distance from the center; instead, a flat velocity curve was observed. This implied the existence of a significant amount of matter in the galactic halo, which did not emit light and was not directly observable, hence the term 'dark matter.' Rubin's work on spiral galaxies reinforced Zwicky's findings, showing that their outer regions were rotating at similar speeds to their centers, suggesting a discrepancy between visible and actual matter. The presence of dark matter is also confirmed by observations of other electromagnetic (EM) wavelengths—such as radio waves and X-rays—and through the gravitational effects it has on luminous matter, like gravitational lensing.

Two very small spherical metal objects, each with 1 coulomb of charge, are brought together in a vacuum so that the separation distance between their centers is 1 mm. what is the force of repulsion between the two object? (coulomb's constant is k=9.0 × 109 n.m2/c2.)

Answers

Answer: 9*10^15 N

Force=kqq/r^2

F=[(9*10^9)(1)(1)]/.001^2=9.0*10^15

Answer:

The force of repulsion between the two object is 9*10¹⁵ N

Explanation:

Coulomb's law indicates that charged bodies suffer a force of attraction or repulsion when approaching. The value of said force is proportional to the product of the value of its loads and inversely proportional to the square of the distance that separates them. This is expressed mathematically by the expression:

[tex]F=K*\frac{Q*q}{r^{2} }[/tex]

where:

F is the electrical force of attraction or repulsion. In the International System it is measured in Newtons (N). Q and q are the values ​​of the two point charges. In the International System they are measured in Culombios (C). r is the value of the distance that separates them. In the International System it is measured in meters (m). K is a constant of proportionality called constant of Coulomb's law.   It depends on the medium in which the loads are located. For vacuum K is approximately 9*10⁹ [tex]\frac{N*m^{2} }{C^{2} }[/tex] in the International System.

From this law it is possible to predict the electrostatic force of attraction or repulsion between two particles according to their electrical charge and the distance between them.

The force will be of attraction if the charges are of opposite sign and of repulsion if they are of the same sign.

In this case:

Q=q= 1 Cr=1 mm= 0.001 m

Then:

[tex]F=9*10^{9} \frac{N*m^{2} }{C^{2} } *\frac{1 C*1C}{(0.001m)^{2} }[/tex]

So:

F=9*10¹⁵ N

The force of repulsion between the two object is 9*10¹⁵ N

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is A) zero. B) equal to its weight divided by its mass. C) equal to the product of its mass times its weight.

Answers

Answer:

Zero

Explanation:

According to Newton's second law, the net force acting on an object is equal to the product between the object's mass and its acceleration:

F = ma

For the hockey puck, there are no forces acting on it during its motion, since ice friction and air resistance are negligible. This means that the net force is zero:

F = 0

But this means that the acceleration is also zero:

a = 0

So the hockey puck is moving already at constant velocity. Therefore, there is no need for additional forces.

Final answer:

The force required to maintain a hockey puck's constant velocity across a frictionless ice pond, where air resistance is also neglected, is zero, in accordance with Newton's first law of motion.

Explanation:

The question pertains to dynamics in classical mechanics, specifically to Newton's first law of motion which states that an object in motion will remain in motion at a constant velocity if no net external force acts upon it. Since the question specifies a scenario where air resistance and ice friction are neglected, the force required to keep the puck sliding at constant velocity is zero. This is because there are no external forces acting on the puck to change its state of motion.

In a hypothetical frictionless environment, once the hockey puck is set in motion, it does not require any additional force to maintain its velocity due to the absence of resistive forces such as friction and air resistance. Indeed, this is an idealized situation, but it helps us understand the principle that, without external forces, a moving object will continue to move at a constant speed and direction.

A voltmeter is a device that measures _____. The type of charge on a resistor. The current through a resistor. The voltage across a resistor. The total current of the circuit.

Answers

A voltmeter is an instrument used to measure the voltage across a component in an electric circuit, and it must be connected in parallel with the component. It operates on the principles of Ohm's law and contains a high-value internal resistor to measure the voltage accurately without significantly influencing the current in the circuit.

A voltmeter is a device specifically designed to measure the voltage across a resistor or any two points in a circuit. When using a voltmeter, it's important to connect it in parallel with the component whose voltage you want to measure. This is to ensure that it measures the full voltage and that its high internal resistance does not significantly alter the current in the circuit. Voltmeters can come in analog form, where a needle moves across a scale, or as a digital voltmeter, which provides a numeric display.

The internal workings of a voltmeter involve it being similar to an ammeter, but with an additional high-value resistor. According to Ohm's law, the current through a resistor is directly proportional to the voltage across it. Hence, the voltmeter can be calibrated to measure volts based on the known value of the internal resistor.

A convex mirror, like the passenger-side rearview mirror on a car, has a focal length of -3.0 m . An object is 6.0 m from the mirror.Part A) Use ray tracing to determine the location of its image. How far is the image from the mirror? Input positive value if the image is on the same side from the mirror as an object and negative if the image is on the other side.Part B) Is the image upright or inverted? Is it real or virtual?

Answers

A) -2.0 m

Look at the ray diagram attached in the picture, where:

p identifies the location of the object

q identifies the location of the image

F identifies the focus of the mirror

Each tick represents 1 m

We have

p = 6.0 m is the distance of the object from the mirror

f = -3.0 m is the focal length

From the ray diagram, we see that q has a distance of 2.0 m from the mirror, and it's on the other side of the mirror compared to the object, so

q = -2.0 m

This can also be verified by using the mirror equation:

[tex]\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{-3.0 m}-\frac{1}{6.0 m}=-\frac{3}{6.0 cm}\\q = \frac{-6.0 cm}{3}=-2.0 cm[/tex]

B) Upright and virtual

As we see from the picture, the image is upright, since it has same orientation as the object.

Also, we notice that the image is on the other side of the mirror, compared to the object. For a mirror,

- An image is said to be real if it is on the same side of the object

- An image is said to be virtual if it is on the opposite side of the mirror

Therefore, this means that the image is virtual.

Final answer:

The image is located 2.0 m behind a convex mirror when the object is 6.0 m away, and the image will be virtual and upright.

Explanation:

To determine the location of the image formed by a convex mirror with a focal length of -3.0 m when an object is placed 6.0 m from it, we use the mirror equation:

1/f = 1/do + 1/di

Where f is the focal length, do is the object distance, and di is the image distance. Since we know that the focal length is -3.0 m and the object distance is 6.0 m, we can plug these values into the equation:

1/(-3.0) = 1/6.0 + 1/di

Calculating the image distance di, we find:

di = -2.0 m

This means the image is located 2.0 m behind the mirror, hence we use a negative value to indicate that the image is on the other side of the mirror, which corresponds to a virtual image.

For Part B), since convex mirrors always form virtual, upright images, the image formed will be upright and virtual.


The human eye can respond to as little as 10^-18J of light energy. For a wavelength at the peak of visual sensitivity, 550 nm, how many photons lead to an observable flash?

Answers

Answer:

Approximately 3 photons

Explanation:

The energy of a photon at the peak of visual sensitivity is given by:

[tex]E=\frac{hc}{\lambda}[/tex]

where

h is the Planck constant

c is the speed of light

[tex]\lambda=550 nm = 5.5\cdot 10^{-7}m[/tex] is the wavelength of the photon

Substituting into the formula,

[tex]E_1=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^( m/s)}{5.50\cdot 10^{-7} m}=3.6\cdot 10^{-19} J[/tex]

This is the energy of one photon. The human eye can detect an amount of energy of

[tex]E=10^{-18} J[/tex]

So the amount of photons contained in this energy is

[tex]n=\frac{E}{E_1}=\frac{10^{-18} J}{3.6\cdot 10^{-19}J}=2.8 \sim 3[/tex]

so approximately 3 photons.

What is the largest tsunami ever recorded

Answers

Answer:

A tsunami with a record run-up height of 1720 feet occurred in Lituya Bay, Alaska. On the night of July 9, 1958, an earthquake along the Fairweather Fault in the Alaska Panhandle loosened about 40 million cubic yards (30.6 million cubic meters) of rock high above the northeastern shore of Lituya Bay.

Explanation:

The largest tsunami ever recorded was a megatsunami in Lituya Bay, Alaska, reaching 1722 ft (525 m) due to a rockslide caused by a magnitude 7.8 earthquake in 1958.

The largest tsunami ever recorded occurred in Lituya Bay, Alaska, on July 9, 1958. A magnitude 7.8 earthquake triggered a massive rockslide, which caused a megatsunami, creating a wave that reached 1722 ft (525 m) above sea level. The landslide displaced a huge amount of water, which surged up the opposite side of the bay.

This is the highest wave ever known, dwarfing other catastrophic events like the Chilean earthquake tsunami of 1960 and the Tohoku-oki Earthquake tsunami in Japan in 2011. Despite the height of the 1958 megatsunami, it should be noted that the most devastating in terms of loss of life was the 2004 Indian Ocean tsunami, triggered by a magnitude 9 earthquake that took approximately 230,000 lives.

Name all of the planets people have walked on

Answers

Final answer:

People have only walked on the Moon, where twelve astronauts have set foot during the Apollo missions between 1969 and 1972. No other planets have been physically explored by humans.

Explanation:

The only planet that people have walked on is Earth's moon. Human exploration of other celestial bodies is quite limited. The United States' Apollo 11 mission was the first to land humans on the Moon, and a total of twelve astronauts have walked on its surface during the Apollo missions that took place between 1969 and 1972. Since then, no human has set foot on any other planet or celestial body.

What protein are bones primarily made up of?

Answers

Answer: Collagen

Collagen is the protein that holds together the different structures of the body, including skin and bones. This is because the collagen molecule has the ability to mix with many types of substances and minerals, and in the case of bone tissue, the combination of collagen with calcium crystals allows the formation of the hard and rigid structure necessary for healthy bones.

Note that this component is the most abundant in mammals, especially in their skin, and in the specific case of humans, corresponds to approximately [tex]25%[/tex] of the total mass of proteins in our body.

A manufacturer of CD-ROM drives claims that the player can spin the disc as frequently as 1200 revolutions per minute.



a. If spinning at this rate, what is the speed of the outer row of data on the disc?


This row is located 5.6 cm from the center of the disc.




b. What is the acceleration of the outer row of data?

Answers

a. 7.0 m/s

First of all, we need to convert the angular speed (1200 rpm) from rpm to rad/s:

[tex]\omega = 1200 \frac{rev}{min} \cdot \frac{2\pi rad/rev}{60 s/min}=125.6 rad/s[/tex]

Now we know that the row is located 5.6 cm from the centre of the disc:

r = 5.6 cm = 0.056 m

So we can find the tangential speed of the row as the product between the angular speed and the distance of the row from the centre of the circle:

[tex]v=\omega r = (125.6 rad/s)(0.056 m)=7.0 m/s[/tex]

b.  [tex]875 m/s^2[/tex]

The acceleration of the row of data (centripetal acceleration) is given by

[tex]a=\frac{v^2}{r}[/tex]

where we have

v = 7.0 m/s is the tangential speed

r = 0.056 m is the distance of the row from the centre of the trajectory

Substituting numbers into the formula, we find

[tex]a=\frac{(7.0 m/s)^2}{0.056 m}=875 m/s^2[/tex]

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13) v=c/n For c, round to 300,000 km/sec

The speed of light in a material is calculated by dividing the speed of light in a vacuum by the index of refraction in the material.

Calculate the speed of light in water which has a refraction rate of 1.33. Showing your work is not necessary.


14) v=c/n For c, round to 300,000 km/sec

The speed of light in a material is calculated by dividing the speed of light in a vacuum by the index of refraction in the material.

Calculate the speed of light in glass which has a refraction rate of 1.50

Showing your work is not necessary.



Answers

Answer:

13) v = 225,563.9

14) v = 200,000

Answer:

b

Explanation:

took test

What is the efficiency of an engine that does 576 J of work and exhausts 144 J of heat while taking in 720 J of heat?

A. 80%
B. 10%
C. 25%
D. 20%

Answers

the answe would be 80%

Answer:

The efficiency of an engine is 80%.

(A) is correct option.

Explanation:

Given that,

Work done = 576 J

Supplied heat = 720 J

Exhausts of heat = 144 J

We need to calculate the efficiency

Using formula of efficiency

[tex]\eta=1-\dfrac{Q_{2}}{Q_{1}}[/tex]

Where, Q₁ = Supplied heat

Q₂ =  Exhausts of heat

Put the value into the formula

[tex]\eta=1-\dfrac{144}{720}[/tex]

[tex]\eta=0.8\times100[/tex]

[tex]\eta=80\%[/tex]

Hence, The efficiency of an engine is 80%.

In this lab you will use a simulation to explore the process of radioactive decay. You will examine how long it takes for an isotope to decay. In the space below, write a scientific question that you will answer by doing this experiment.

Answers

Answer:

Sample Response: How does the number of radioactive atoms change over time?

Explanation:

Final answer:

In a lab experiment on radioactive decay, a fitting scientific question could be 'What is the half-life of the given radioactive isotope?' This can be determined through the simulation by measuring the time it takes for half of the simulated atoms to decay.

Explanation:

In this lab experiment revolving around the concept of radioactive decay, an appropriate scientific question could be: 'What is the half-life of the given radioactive isotope?' This question seeks to learn the amount of time it takes for half of an isotope's atoms to decay. During your radioactive decay simulation, you'll be able to measure this by observing how long it takes for half of your simulated atoms to decay.

Using the simulation, one can record the time at regular intervals and count the remaining isotopes. By plotting this data on a graph with time on the x-axis and the number of remaining isotopes on the y-axis, we can see a decay curve form due to the nature of radioactive decay. The half-life is found at the point where half of the isotopes remain.

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Orbital velocity is the average speed of a planet moving through space in its orbit around the sun. Which of the following planets has the fastest orbital velocity? MarsVenusJupiterMercury

Answers

The force of gravity is equal to the mass times centripetal acceleration.

Fg = m v^2 / r

The force of gravity is defined by Newton's law of universal gravitation as:

Fg = mMG / r^2

Therefore:

mMG / r^2 = m v^2 / r

MG / r = v^2

v increases as r decreases. So the planet with the smallest orbit (closest to the sun) will have the highest orbital velocity. Of the four options, that's Mercury.

Final answer:

Mercury has the fastest orbital velocity among the planets listed, with an average speed of 48 kilometers per second, due to its close proximity to the Sun and short orbital period.

Explanation:

According to Kepler's laws of planetary motion, the orbital velocity of a planet decreases with the distance from the Sun. Among the planets listed - Mars, Venus, Jupiter, and Mercury - it is Mercury that orbits closest to the Sun. Moreover, Mercury has the shortest orbital period of 88 Earth-days and thus possesses the highest average orbital velocity of approximately 48 kilometers per second.

Comparatively, the orbital velocity of Venus, the second planet from the Sun, would be slower, and Mars and Jupiter, being further away, would have even lower orbital velocities. Kepler's second law, which states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time, implies that planets move faster when they are closer to the Sun (perihelion) and slower when they are further away (aphelion). However, given Mercury's significantly shorter distance from the Sun and its relatively higher orbital speed, it is clear that Mercury has the fastest orbital velocity among the planets mentioned.

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using these data, calculate the standard enthalpy of reaction.Zn(s) + 2HBr(aq) --> ZnBr2(aq) + H2(g)

Answers

Answer:

247 kJ/mol

Explanation:

Zn(s) + 2HBr(aq) → ZnBr₂(aq) + H₂(g)

First, we need to find the limiting reactant.  And to do that, we need to find the amount of moles of each reactant.

2.50 g Zn * (1 mol / 65.38 g) = 0.03824 mol Zn

0.1000 L * 2.00 mol/L = 0.200 mol HBr

Since 1 mol of Zn reacts with 2 mol of HBr, it is clear that Zn is the limiting reactant.

The amount of heat can be calculated as:

q = (448 J/K) * (21.1 K)

q = 9452.8 J

So the standard enthalpy of reaction is:

ΔH = (9452.8 J) / (0.03824 mol Zn)

ΔH = 247 kJ/mol

Breathing is called _____. expiration inspiration circulation respiration

Answers

Breathing is called respiration.

Answer:

respiration

Explanation:

Mechanical energy is conserved in the presence of which of the following types of forces?magnetic
frictional
electrostatic
gravitational

Answers

Answer: electrostatic and gravitational force

Mechanical energy remains constant (conserved) if only conservative forces act on the particles.  

In this sense, the following forces are conservative:  

-Gravitational  

-Elastic

-Electrostatics  

While the Friction Force and the Magnetic Force are not conservative.

According to this, mechanical energy is conserved in the presence of electrostatic and gravitational forces.

When an electron in a quantum system drops from a higher energy level to a lower one, the system ____.
emits an electron
emits a plasmon
emits a photon
emits a neutron

Answers

Answer:

emits a photon

Explanation:

When an electron in a quantum system drops from a higher energy level to a lower one, the system emits a photon. According to the law of conservation of energy, the energy of the emitted photon is equal to the difference in energy between the two energy levels:

[tex]\Delta E= E_1 -E_2[/tex]

The opposite transition can also occur: the system can absorb a photon such that the electron jumps from the lower energy level to the higher level. As before, the energy of the emitted photon is equal to the difference in energy between the two energy levels:

[tex]\Delta E= E_2 -E_1[/tex]

When a fixed amount of ideal gas goes through an isochoric process:

its temperature must increase.
its pressure must increase.
its internal (thermal) energy does not change.
no heat enters or leaves the gas.
the gas does no work.

Answers

Answer:

the gas does no work.

Explanation:

An isochoric process is a process in which the volume of a gas is kept constant.

The work done by a gas during a transformation is given by:

[tex]W=p\Delta V[/tex]

where

p is the gas pressure

[tex]\Delta V[/tex] is the change in volume of the gas

For an isochoric process, the volume of the gas does not change, so

[tex]\Delta V[/tex]

and so, according to the previous equation, the work done by the gas is zero:

W = 0

A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision?

Answers

Answer:

12.2 m/s

Explanation:

Initial momentum = final momentum

In the x direction:

(900 kg) (15.0 m/s) = (900 kg + 750 kg) vx

vx = 8.18 m/s

In the y direction:

(750 kg) (20.0 m/s) = (900 kg + 750 kg) vy

vy = 9.09

The magnitude of the velocity is therefore:

v = √(vx² + vy²)

v = 12.2 m/s

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