Physics Middle School

Which statement is true about the formation of bonds?

A. There is an overall release of energy when bonds form.
B. There is an overall energy increase when bonds form.
C. A bond is formed as atoms are split apart from each other.
D. Bonds are always first-order.

Answers

Answer 1
The answer is A. As a stable configuration is reached when atoms bond, so you are in a state of lower energy than not bonded.
Answer 2

Answer:

A. There is an overall release of energy when bonds form.

Explanation:

There is a general release of energy when bonds form. This energy is called bond energy.

Bond energy is involved in the breakdown or formation of one or more bonds between atoms of a molecule. Atoms bond with each other to achieve their electronic stability, that is, they move from a higher energy situation to a lower energy one. With this we can state that when the bond between atoms is formed, energy is released; therefore, its breakdown depends on energy absorption.

Related Questions

A circuit is made of 0.4 ohm wire, 150 ohm bulb and a 120ohm rheo stat connected inseries. Determine the total resistance of the resistance of the circuit?

Answers

Answer:
Total resistance of the circuit is 270.4 ohm

Explanation:
We are given that:
resistance of wire = 0.4 ohm
resistance of bulb = 150 ohm
resistance of rheostat = 120 ohm

We are also given that these components are connected in series. This means that the total resistance is summation of all the series components.

Therefore
Total resistance = 0.4 + 150 + 120 = 270.4 ohm

Hope this helps :)

A water skier is pulled behind a boat by a rope. The rope has a tension of 650 N and is at an angle of 27°. What is the y-component of the tension?

Answers

There is no figure, so I asume the angle of the rope is measured with respect to the horizontal direction.

If this is the case, then the magnitude of the tension is the hypothenuse of a right triangle, of which [tex]T_x [/tex] and [tex]T_y [/tex] (horizontal and vertical component of the tension) are the other sides, and [tex]\alpha[/tex] is the angle between T and [tex]T_x[/tex]. 
Therefore, [tex]T_y[/tex] (the side of the triangle opposite to [tex]\alpha[/tex]) is given by the magnitude of the tension multiplied by the sine of the angle:
[tex]T_y = T \sin \alpha = (650 N)(\sin 27^{\circ} )=295 N[/tex]

Answer: 295N

Explanation:

graph B shows the solubility of which types of substances?

A) solid dissolved in gas
B) gas dissolved in a liquid
C) solid dissolved in a liquid
D) liquid dissolved in a liquid

Answers

Answer:

Graph B shows  the solubility of gas dissolved in a liquid.

In graph B the temperature is increasing and solubility decreases

So, when temperature increases the molecules of the gas becomes free their kinetic energy increases.

Hence, their solubility decreases they will be more present in the form of vapors.

Therefore, Option B is correct that is gas dissolved in a liquid.

Answer:

B) gas dissolved in a liquid

Explanation:

Using Hooke's law, F subscript s p r i n g end subscript equals k increment x, find the elastic constant of a spring that stretches 2 cm when a 4 newton force is applied to it.

A. 1/2 N/cm

B. 2 N/cm

C. 4 N/cm

D. 8 N/cm

Answers

Let's rewrite Hook's law:
[tex]F=-kx[/tex]
where
F is the force
k is the spring's constant
x is the compression/elongation of the spring

Neglecting the sign (since we are not interested in the direction of the force), we can re-arrange the formula and use the data of the problem to find the spring constant:
[tex]k= \frac{F}{x}= \frac{4 N}{2 cm}=2 N/cm [/tex]

Therefore, the correct answer is B) 2 N/cm.


High tide are experienced 12 hours apart for a certain coastline. Which of the following best explains the reason for this phenomenon?

The coastline experiences tidal bulge twice a day.

The coastline experiences tidal bulge once a day.

The coastline comes in a straight line with the moon once.

The coastline becomes 90 degress with the moon twice.

Answers

The answer is The coastline experiences tidal bulge twice a day. This occurs due to the rotation of the earth. When the sun is either on the same side as the moon or opposite side of the moon relative to the earth (which happens twice a day), then the coastline will experience high tide on these two occasions. Tides are caused by gravitational effect on water masses on the earth that cause them to bulge towards the direction of the two celestial bodies.

Answer:

The coastline experiences tidal bulge twice a day

Explanation:

If the actual frictional force is equal to 1 lb., then how much effort (force) would be required to drag a 90 lb. box up the plane?

A. 10+ lb.
B. 10- lb.
C.9+ lb.
D. 9- lb.

Could you also explain this? I am having a hard time understanding.

Answers

Resolving 90 lb along the incline;

The resultant weight along the incline = 90 Sin ∅ = 90*H/90H = 90*1/9 = 9 lb.

The effort must overcome the resultant weight along the incline as well as the frictional force.
That is,
Fe > 9+1
Fe > 10 lb

Therefore,
Fe = 10+ lb

And the correct answer is A.

how do paved parking lots and roads with concrete or asphalt affect water flow on the land?

Answers

On the regular ground, water usually seeps in to the soil, which has a number of benefits for the wildlife in that area. However, with asphalt and concrete, there is no soft and absorbent soil to take in the water, so it just keeps flowing down to the lowest part of land it can. Additionally, some water runoff can carry fertilizer and other harmful chemicals with it in to the oceans and lakes it’s dumped in, which harms the ecosystem in them as well.
Final answer:

Paved parking lots and roads with concrete or asphalt prevent water infiltration into the ground, causing surface runoff that can lead to floods, pollution, altered water cycles, and erosion.

Explanation:

Paved parking lots and roads made with concrete and asphalt greatly affect the water flow on the land, especially during rainfall. This is due to the impermeability of these materials, which prevents the water from infiltrating or seeping into the ground. Instead, the water becomes surface runoff, rapidly moving across the surface and often causing flash floods, especially in urban areas where these paved surfaces are prevalent.

One environmental effect is the potential for increased pollution. As cars travel, oil and gasoline often leak onto these surfaces. Upon rainfall, these substances are picked up by the surface runoff and can pollute the surrounding areas and water bodies.

This surface runoff also alters the natural water cycle and can affect the local vegetation and soil drainage as the natural filtering capacity of the soil is bypassed. Additionally, in sloped areas, the fast moving water can cause erosion and debris or mud flows.

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If a positively charged particle moves into a magnetic field traveling in a straight line, how would you expect it's motion to change

Answers

It would begin to curve toward the magnetic pull

Explanation:

If a positively charged particle moves into a magnetic field traveling in a straight line then there will be Lorentz force which acts on the positively charged particle.

The force exerts on a moving charge in a magnetic field. This force is Lorentz force.

The expression for Lorentz force is as follows;

[tex]F=q(v\times B)[/tex]

[tex]F=qvBsin\theta[/tex]

Here, q is the charge, v is the velocity, [tex]\theta[/tex] is the angle between velocity and the magnetic field and B is the magnetic field.

There will be two conditions.

(1) If the positively charged particle moves parallel to the magnetic field then there will be no force on this particle. There is no deviation from the straight line. As the Lorentz force depends on the cross product of velocity and magnetic field. Sine 180 degree or sin 0 degree is zero in this case.

(2) If the positively charged particle moves perpendicular to the magnetic field then it follows the curved path until it completes the circle. The force is perpendicular to the direction of motion of the charged particle.

The charged particle will move in a circular motion.

why do hurricanes tend to form in warmer climates

Answers

warm air rises causing an area of lower air pressure below.
I agree with the previous answer. Also, another fact is that the hurricane picks up the water vapor that is in the air to form clouds.

a cup on a table is pushed horizontally with a force of 0.7N. the cup remains at rest. what are all the forces that make up the net force on the cup, and what is the net force on the cup, in newtons

Answers

1) The following is the list of forces acting on the cup:
- the weight of the cup (mg), acting downward
- the normal reaction of the table (N), acting upward, that balances the weight of the cup
- the horizontal force of 0.7 N that pushes the cup
- the frictional force ([tex]\mu N[/tex]), acting horizontally but in the opposite direction of the previous force, that prevents the cup from sliding

2) The net force acting on the cup is 0 N. In fact, the cup is at rest, so its acceleration is zero: for Newton's second law, if an object is not accelerating, it means the net force acting on it is zero:
[tex]\sum F = ma[/tex]
where the term on the left is the resultant of the forces acting on the object, m is its mass and a its acceleration. Since the acceleration a is zero, the term on the left must be zero as well.

Match the correct term with each part of the wave

Answers

6 - crest
7 - amplitude
8 - wavelength
9 - trough

Answer:

6 - crest

7 - amplitude

8 - wavelength

9 - trough

Explanation:

Just finished and got it correct

If the humidity in a room of volume 450 m3 at 30 ∘C is 75%, what mass of water can still evaporate from an open pan?

Answers

From tables,

SVP at 30°C = 4.24 kPa

From ideal gas expressions;
n = PV/RT = (4.24*1000*450)/(8.314*303) = 757.4 moles

Now, 75% of 757.4 moles will evaporate leaving 20%. Then, 25% of 757.5 moles...
25% of 757.4 moles = 25/100*757.4 = 189.35 moles
Mass of 189.35 moles = 189.35 moles*18 g/mol = 3408.3 g ≈ 3.4 kg

The additional mass of water that can evaporate before reaching full saturation is 3.42 kg for a room volume of 450 m³.

The question deals with the concepts of humidity, temperature, and the capacity of air to hold water vapor. At 30°C, the saturation vapor density of water is approximately 30.4 grams per cubic meter. If the room is at 75% relative humidity, that means the current water vapor density is 75% of the saturation vapor density. Therefore, the room currently has 0.75 × 30.4 g/m³ = 22.8 g/m³ of water vapor.

To find out how much more water can evaporate, we need to calculate the difference between the saturation vapor density and the current vapor density. This difference represents the capacity for additional water vapor before the air becomes saturated at 100% humidity. So, the additional mass of water that can evaporate into the room is (30.4 g/m³ - 22.8 g/m³) × 450 m³ = 3420 grams, or 3.42 kilograms.

How is energy essential to our way of life?

Answers

because ot helps us to do our work. it is the capacity of doing work. the energy like mechanical energy, chemical energy etc have been helping humans from almost origin of our life. transformation of energy also helps us grately. in this way energy is essential to our way of life.

Tracy pattern block divided into two equal parts and write a unit fraction to describe the area of each part explain your work

Answers

Trapezoids or pentagons
1/2

Land near the ocean along the coast experience weather that is more moderate than the inland climate. So along the coast you can predict that compared to inland weather it should be during the summer and during the winter

Answers

Final answer:

Coastal climates are moderated by the ocean's heat inertia, leading to cooler summers and milder winters compared to inland areas. This is due to water heating and cooling more slowly than land, which stabilizes temperatures year-round.

Explanation:

Coastal areas tend to experience more moderate weather compared to inland areas due to the influence of large bodies of water like oceans. The heat inertia of water means it heats and cools much more slowly than land does, resulting in coastal climates that are less variable and more moderate, even in places far north that would otherwise experience extreme temperatures. During the summer, one can expect that coastal areas would be cooler than inland regions because the ocean absorbs and retains heat more slowly. Likewise, winters along the coast are typically milder than those experienced inland because the ocean retains heat from the summer longer, releasing it slowly over time.

Facts such as Norway's coastal areas remaining ice-free through winter despite being within the Arctic region, and Canada's west coast receiving significant precipitation, illustrate how nearby water bodies moderate local climates. Similarly, urban areas in Australia like Sydney, Melbourne, and Adelaide experience moderate Type C climates because they are near the ocean, which tends to stabilize temperatures throughout the year, making them more mild compared to the greater fluctuations found in inland or more extreme latitudinal locations.

a 63 kg object needs to be lifted 7 in a matter of 5 Seconds approximately how much horsepowers is required to achieve this task

Answers

We need to lift an object from a point A to another point B. So, we have these variables:

For the object:
m = 63Kg

Height:
h = 7in

Time:
t = 5s

Horsepower (hp) is a unit of measurement of power. So, the term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. So:

[tex]P = \frac{W}{t}[/tex]

So, we need to calculate the work W. A force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force. In a mathematical language:

[tex]W=Fd[/tex]

Given that the displacement is vertically, this force will be:

[tex]F=mg=(63kg)(9.8m/s^{2})=617.4N[/tex]

We need to convert the unit in into m, so:

1in = 0.0254m
 
Then:
7in = 0.1778m

Therefore, as the displacement d = h:

[tex]W = (617.4)(0.1778)=109.77(J)[/tex]

Finally:

[tex]P= \frac{109.77}{5}=21.95W[/tex]

The result is expressed in Watts, so we need to convert it into hp, so:

1hp = 746W

[tex]P= 21.95W(\frac{1hp}{746W})=0.03hp[/tex]





25 POINTS FOR CORRECT ANSWER
Stefan is writing a report about the law of reflection. In his report, he says that the angle of incidence is the angle between the surface of the mirror and the incoming ray. Do you agree with him? Why or why not?

Answers

No.  I do not agree with Stefan.  Quite the contrary.  I disagree
with his description of "angle of incidence" as the angle between
the surface of the mirror and the incoming ray. 

The correct description of "angle of incidence" is the angle between
the NORMAL TO the surface of the mirror and the incoming ray. 

Thus, the true angle of incidence is the complement of the angle that
Stefan calculates or measures.

The angle of incidence is the angle formed between the incident ray and its normal drawn on the plane. So, his statement is wrong.

What is law of reflection ?

Law  of reflection states that, when a light ray falls on a reflecting surface  and gets reflected, the angle of incidence becomes equal to the angle of reflection.

Here,

The report given by Stefan is about the law of reflection. In the report, he says that the angle of incidence is the angle between the surface of the mirror and the incoming ray.

This not correct and I disagree with his statement because,

The angle of incidence in optics is defined as the angle formed between the incident ray on the surface and the normal drawn at the point of incidence at the surface of the mirror.

The formation of angle of incidence is given in the figure.

Hence,

The angle of incidence is the angle formed between the incident ray and its normal drawn on the plane. So, his statement is wrong.

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Attaching the image here.

A light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm.

Answers

I guess the problem is asking for the position of the image.

We can solve the problem by using the mirror equation:
[tex] \frac{1}{f}= \frac{1}{d_o}+ \frac{1}{d_i} [/tex]
where
f is the focal length of the mirror
[tex]d_o[/tex] is the distance of the object from the mirror
[tex]d_i[/tex] is the distance of the image from the mirror

For the sign convention, the focal length is taken as positive in a concave mirror. If we use f=8 cm and [tex]d_o =20 cm[/tex] in the equation, we can find the position of the image:
[tex] \frac{1}{d_i} = \frac{1}{f}- \frac{1}{d_o}= \frac{1}{8 cm}- \frac{1}{20 cm}= \frac{3}{40 cm} [/tex]

from which we find
[tex]d_i = \frac{40 cm}{3}=+13.3 cm [/tex]
and the positive sign means the image is real.

Final answer:

A mirror with an inward curvature and a focal point is said to be concave. The light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm so that the light rays will converge at a point 8 cm behind the mirror.

Explanation:

A concave mirror is a mirror that curves inward, like the inside of a spoon. It has a focal point, which is the point at which parallel rays of light converge after reflecting off the mirror. The light bulb is positioned 20 cm in front of an eight cm-wide concave mirror. This means that the light rays from the bulb will reflect off the mirror and converge at a point 8 cm behind the mirror.

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how does the height of the Sun change throughout the year?

Answers

through the tilt of the earth

Which statement about the free enterprise system is true? It allows the citizen to own government property. It exempts the citizen from taxes if that person serves the government. It allows the citizen to share political power with the rest of the population. It allows the citizen to own and operate a private business for profit. It allows the citizen to be part of a one-class system under state control.

Answers

it allows the citizen to own and operate a private business for profit.

The true statement about the free enterprise system is that it allows citizens to own and operate a private business for profit. The correct option is:  It allows the citizen to own and operate a private business for profit.

In a free enterprise system, individuals have the liberty to establish their businesses, make independent economic decisions, and compete in the market without excessive government intervention. This economic model fosters entrepreneurship, innovation, and wealth creation, as individuals are motivated to maximize their profits and meet consumer demands. Unlike a one-class system under state control, the free enterprise system promotes economic diversity and opportunities for social mobility. Citizens can engage in private enterprise, contribute to economic growth, and play an essential role in shaping the economy's direction. Therefore, correct option is:  It allows the citizen to own and operate a private business for profit.

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How does Sonar work?i will mark brainliest pls help
1. By passing sound waves through objects
2.by speeding up sound waves in different materials
3. By locating objects in outer space
4.by passing sound waves off of objecta

Answers

I don't like the wording of any of the choices on the list.

SONAR generates a short pulse of sound, like a 'peep' or a 'ping',
focused in one direction.  If there's a solid object in that direction,
then some of the sound that hits it gets reflected back, toward the
source.  The source listens to hear if any of the sound that it sent
out returns to it.  If it hears its own 'ping' come back, it measures
the time it took for the sound to go out and come back.  That tells
the SONAR equipment that there IS a solid object in that direction,
and also HOW FAR away it is.

RADAR works exactly the same way, except RADAR uses radio waves. 


Calculate the potential difference across a 25- resistor if a 0.3-A current is flowing through it. V

Answers

By Ohm's law

V = IR


we have
R (resistance) = 25 Ω 
electic current (I)= 0.3 A


substitute these values in V = IR and you'll get

V (potential difference ) = 25 × 0.3 V = 7.5V

Answer:

7.5 V

Explanation:

Which organism in the food web above is sometimes a first-level consumer and sometimes a second-level consumer?Explain

Answers

The answer is: Mouse/Herbivore.

First organism is always a producer (plant) such as grass.
The 2nd organism is the first level or primary consumer. Ex. Mouse - It eats the producer, so it is a herbivore. 
Final answer:

The smallmouth bass is the organism in the food web that can be a first-level consumer or a second-level consumer depending on its diet.

Explanation:

In the given food web, the organism that is sometimes a first-level consumer and sometimes a second-level consumer is the smallmouth bass.

The smallmouth bass is a first-level consumer when it feeds on the primary consumers, such as crayfish and insects. However, it can also be a second-level consumer when it feeds on other first-level consumers, like the minnows and sunfish.

Therefore, the smallmouth bass can occupy different trophic levels depending on its diet, making it a versatile consumer in the food web.

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If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.

Answers

The centripetal acceleration of the object moving in uniform circular motion with a radius of 1.0 meter and completing 10 revolutions in 4.0 seconds is calculated to be 39.478 m/s²

To calculate the centripetal acceleration of an object in uniform circular motion, you can use the formula ac = v2 / R, where v is the velocity and R is the radius of the circle. In this case, since the object makes 10 revolutions in 4.0 seconds, we find the velocity by first calculating the circumference with C = 2πR, which is 2π meters because R = 1.0 meter. Then, the total distance traveled in one revolution is 2π meters, and in ten revolutions, it is 10 x 2π meters. The speed v is the total distance traveled divided by the time, so v = (10 x 2π) / 4.0 meters per second. Then, square the speed and divide by the radius to find the centripetal acceleration: ac = (10 x 2π / 4.0)2 / 1.0.

After performing the calculations, ac = 39.478 m/s² as the centripetal acceleration of the object.

Match what is seen through a telescope in Column A with the information that is learned from it in Column B. Column A 1. the visible light spectrum emitted by a star : the visible light spectrum emitted by a star 2. the brightness of a star : the brightness of a star 3. the color of a star : the color of a star Column B a. the distance between the star and Earth b. the chemical composition of the star c. the temperature of the star

Answers

Ans: The matching is as follows:
1. the visible light spectrum emitted by a star (1) ⇔ the chemical composition of the star (b)
2. the brightness of a star (2) ⇔ the distance between the star and Earth (a)
3. the color of a star (3) ⇔ the temperature of the star (c)

Explanation:
The brighter the star is, the closer it will be from the Earth. Hence, the brightness of a star depends upon the distance between the star and the Earth. The color of a star tells you how cool or hot it is. Blue colored stars are cool while red colored stars are hot (like sun). Hence, the color of star tells us its temperature. Stars emit different kinds of radiations (which we see in the radiation spectrum). That radiation spectrum tells us the chemical composition of the star.

NOTE: Do not confuse a star with a planet! (most students make this mistake)

Answer:

the visible light spectrum emitted by a star → the chemical composition of the star

the brightness of a star → the distance between the star and Earth

the color of a star → the temperature of the star

Explanation: plato  :3

How far away from Earth is the moon?

a.348 km

b.384,000 km

c.384,000,000 km

Answers

The answer is B- 384,400

PLEASE MARK BRAINLIEST!!!
Final answer:

The distance from Earth to the Moon is approximately 384,000 kilometers, aligned with known values over the last few decades and confirmed through various calculation methods including signal transmission times and Kepler's Third Law.

Explanation:

The distance from Earth to the Moon is approximately 384,000 kilometers (km). This can be inferred from the signal transmission duration of 1.28 seconds from Earth to an astronaut on the Moon, using the speed of electromagnetic radiation (which is the same as the speed of light). Considering that light travels at about 299,792 km/s, the distance is calculated as 1.28 s × 299,792 km/s = 383,654.56 km, which rounds up to approximately 384,000 km. This matches option b in the question and correlates with known values for the average distance of the Moon from Earth over the last 45 years. Furthermore, Kepler's Third Law and the month-long lunar orbit reiterate the same approximate distance.

What is the period of a wave if the wavelenght is 110m and the speed is 200m/s? 2 s 100s 200,000 s 0.5 s

Answers

Hello.

The answer would be  0.5 s

Have a nice day

Answer:

hello im not here to answer the question, sorry.

There is somthin familar about your name Katelyn.

Are you Katelyn.H? from k12, 8th grade? because Im Rukaiya

Explanation:

Circular motion occurs only at or near earths surface true or false

Answers

it's exactly false because circular motion is accur's in all the universe if we take a look on the solar system all the planet's are moving in circular motion and there alot of examples are here in this universe./

Answer:

FALSE

Explanation:

Circular motion refers to the motion of an object in a circular path. This occurs at or near the surface of the earth as well as outside the earth in the space. This can be supported by the following pieces of evidence-

(1) The moon and the other artificial satellites that are moving constantly around the earth in a circular path.

(2) The planets going around the sun forming the solar system also maintains a circular and elliptical plane.

(3) Tying a stone with a rope and swinging it in circles maintaining a constant velocity also satisfies the condition of circular motion at or near the surface of the earth.

Thus, the above-given statement is false.

Which statement does NOT explain the concept of the Doppler Effect?

The answer is: As a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch.

Why?
Do I just have the question wrong I am so confused I thought that as a sound source moved away, the sound waves don't compress decreasing the pitch?

Answers

the answer is wrong. u r right. think about an ambulance passing by u. the pitch is highest when it is right beside u.

Consider the third period of the periodic table. Which element has the smallest atomic radius? A) argon B) scandium C) silicon D) sodium

Answers

The answer is Argon.  In the third period of the periodic table, the element which has the smallest atomic radius is Argon.has 71 pm.  Scandium has 184 pm, Silicon has 111 pm and Sodium has 190 pm.  
Final answer:

Argon (A) has the smallest atomic radius in the third period of the periodic table due to the increased positive charge from the nucleus as we move across the period.

Explanation:

The element with the smallest atomic radius in the third period of the periodic table is argon (A). Atomic radius refers to the size of an atom, which is determined by the distance between the nucleus and the outermost electron shell. In the third period, as you move from left to right, the atomic radius generally decreases because the number of protons in the nucleus increases, causing a stronger pull on the electrons and reducing the size of the atom.

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