How much work is done by a 120N force applied to a box that moves 5m?

Answer:  when the ball moves to the east

Explanation:

Work is done when an external force makes an object move in the direction that it was forcing it to by transferring energy to it.

The wind is blowing to the east which means that it is exerting a force that is trying to move the ball to the east. For work to actually occur, the ball needs to move in the direction of the force being applied which is the east.

Answer:

simplified version of the person above me its option A

Explanation:

Answer:

  W = 529.2 N

Explanation:

We can solve this problem using the translational equilibrium equation, where the forces are the weight of the sergeant and the thrust of the water given by Archimedes' principle

         B - W = 0

where the thrust is

          B = ρ g V_liquid

The volume of the displaced liquid is

          V = A h

we substitute

         ρ g A h = W

We reduce the magnitudes to the SI system

         h = 2.7 cm = 0.027 m

         ρ = 1 g / cm3 = 1000 kg / m³

let's calculate

          W = 1000 9.8 2 0.027

          W = 529.2 N

Answer:

0.25

Explanation:

According to newtons law of motion

\sum F_x = ma

F_f =  ma

nR = ma

nmg = ma

ng = a

n = a/g

g is the acceleration due to gravity

Given

a = 2.42m/s²

g = 9.8m/s²

Substitute into the formula;

n = 2.42/9.8

n = 0.25

Hence the coefficient of kinetic friction is 0.25

Answer:

watermelon?

Explanation:

its heavier so the weight would make it drop faster

im not sure if this is a trick question so

Answer:

Watermelon because the weight of it is heavy and it would push itself on the ground

Answer:

39000 Дж теплової енергії поглинається тілом цинку.

Explanation:

З наведеного вище питання із запитання були отримані наступні дані:

Маса (М) = 2 кг

Початкова температура (T₁) = 10 ° C

Кінцева температура (T₂) = 60 ° C

Тепло (Q) =?

Далі ми перетворимо 2 кг у грами (g). Це можна отримати наступним чином:

1 кг = 1000 г.

Отже,

2 кг = 2 кг × 1000 г / 1 кг

2 кг = 2000 г.

Таким чином, 2 кг еквівалентно 2000 г.

Нарешті, ми визначимо тепло, що поглинається тілом цинку, як показано нижче:

Маса (М) = 2000 г.

Початкова температура (T₁) = 10 ° C

Кінцева температура (T₂) = 60 ° C

Питома теплоємність (С) цинку = 0,39 Дж / гºС

Тепло (Q) =?

Q = MC (T₂ - T₁)

Q = 2000 × 0,39 (60-10)

Q = 780 × 50

Q = 39000 Дж

Отже, 39000 Дж теплової енергії поглинається тілом цинку.

Answer: pretty sure it’s A

Explanation:

Answer:

(A) The same

(B) More

(C) The magnitude of the parent's acceleration is 0.625 m/s²

Explanation:

The given parameters are;

The mass of the parent, m₁ = 64 kg

The mass of the child, m₂ = 16 kg

(A) By Newton's third law of motion, action and reaction are equal and opposite

Therefore, the action of the parent on the child is equal to the reaction of the child on the parent and vice versa

Therefore, the force experienced by the child is the same as the force experienced by the parent

(B) Newton's second law states that an objects acceleration is directly proportional to the applied force and inversely proportional to the mass of the object

Therefore, the parent and the child both experience the same force but the mass of the child is less than the mass of the parent and therefore, by Newton's second law, the acceleration of the child will be more than the acceleration of the parent for the same given force

(C) The acceleration of the child, a₂ = 2.5 m/s²

Let F₁ represent the force experienced by the parent, let F₂ represent the force experienced by the child and let a₁ represent the magnitude of the parent's acceleration

By Newton's third law, we have;

F₁ = F₂

Force, F = Mass, m × Acceleration, a

We can write, F = m × a

Therefore;

F₁ = m₁ × a₁ and F₂ = m₂ × a₂

∴ F₁ = F₂ gives;

m₁ × a₁ = m₂ × a₂

a₁ = (m₂ × a₂)/m₁ = (16 × 2.5)/64 = 0.625

∴ The magnitude of the parent's acceleration = a₁ = 0.625 m/s²

Explanation:

100 CM = 1 m

45 CM = 45 / 100 = 0.45 m

hope it helps:)

Answer:

0.45 meters ar three in 45 centimeters

Answer:

If an object has a high density then the molicules making up that object are closly packed togeather. Because of this, objects with a higher density will have more mass than objects of the same size that have a lesser density.

Answer:

If an object has a high density then the molicules making up that object are closly packed togeather. Because of this, objects with a higher density will have more mass than objects of the same size that have a lesser density.

Explanation:

A crystal or is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions

hope this helps

Answer:

final velocity= gt= 9.8t

where t is time taken by the box to strike ramp

Answer:

A. NaF and MgS

Explanation:

The reaction equation is given as:

             Na₂S  +  MgF₂  →   2NaF  + MgS

The product of this reaction is  NaF and MgS.

In a double displacement reaction there is an actual exchange of partners to form new compounds. This reaction takes place between ionic compounds.

The driving force for the reaction is:

Answer:

11.a) Car B  is faster than Car A. This is because Car B covers more distance in less time, whereas Car A covers less distance in more time. Now, as we know that distance is directly proportional and time is inversely proportional to speed. In Car B, a larger distance and less time and a smaller distance and more time in Car A, indicates that the speed of Car B is more than the speed of Car A.

b) Car B accelerates faster than Car A. We know that, the acceleration is directly proportional to the change in linear velocity and inversely proportional to time taken. Here, The overall journey of Car B is short, whereas for Car A, it's longer. Also, as previously mentioned that the final speeds of Car B is more than Car A [remembering that both Cars start from the origin(rest)]. Hence, the change of velocity in Car B is more than Car A. Hence so.

Answer:

d the disk in a computer hard drive

Explanation:

because hard drive use magnetic memory tostore giga- and terabytes of data in computer.

The disk in a computer hard drive is an application that uses magnets to store information.

Magnets are materials which are produce magnetic properties and make use of magnetic fields.

Magnets are used on various appliances such as speakers, microphones, computer hard disks, electromagnets, etc.

Hard disks make use of the magnetic properties of magnets to store information.

Therefore, the disk in a computer hard drive is an application that uses magnets to store information.

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Answer:

10

Explanation:

a.s = D÷T

= (20+10=30)30÷30

=10

1 m/s is my average speed.

Average speed is the total distance travelled by an object to the total time taken.

i.e.

Average speed = Total distance travelled /Total time taken

[tex]\overline{v}[/tex] = Δx/Δt

According to the question.

Total distance travelled by me = 20m +10m = 30m

Total time taken by me = 30 sec

By using the formula of average speed

[tex]\overline{v}[/tex] = Δx/Δt

= [tex]\frac{30m}{30s}[/tex]

=1 m/s

Hence,1 m/s is my average speed.

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Answer:

False.

Explanation:

Answer:

this answer your question

The free-body diagram of the forces acting on the block is attached.

Work done by the force of gravity = 30 Joule (positive).

Work done by the applied force = 24 Joule (negative).

A force must be applied in order for work to be completed, and there must also be motion or displacement in the force's direction.

The amount of force multiplied by the distance moved in the force's direction is known as the work done by a force acting on an item. Work has no direction and only magnitude. Work is a scalar quantity as a result.

Given parameters:

Weight of the block acting downwards; W = 25 N.

Force applied on the block in upward direction; F = 20 N.

Displacement of the block in downwards; s = 1.2 m.

So, work done by  the force of gravity on the box W = F·s = Fscos0° = Fs = 25×1.2 Joule = = 30 Joule.

And,  work done by  the  applied force  the box W = F·s = Fscos180° = -Fs =  -20×1.2 Joule = = - 24 Joule

Hence, the force of gravity do positive work of magnitude 30 joule on the box and  the applied force do negative work of magnitude 24 Joule on the box.

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Answer: a) 196000 Joules

b) 147000 Joules

Explanation:

a. Potential energy is the energy possessed by an object by virtue of its position.

[tex]P.E=m\times g\times h[/tex]

m= mass of object = 50.0 kg

g = acceleration due to gravity = [tex]9.8ms^{-2} [/tex]

h = height of an object = 400 m

Putting in the values we get:

[tex] P.E=50kg\times 9.8ms^{-2}\times 400m=196000kgm^2s^{-2}=196000Joules[/tex]     [tex](1kgm^2s^{-2}=1Joule )[/tex]

Thus the potential energy at maximum height is 196000Joules.

b. [tex] P.E=50kg\times 9.8ms^{-2}\times 100m=49000kgm^2s^{-2}=49000Joules[/tex]     [tex](1kgm^2s^{-2}=1Joule )[/tex]

Thus loss in P.E = (196000Joules-49000Joules) = 147000 Joules

Answer:

Its just 1 4 an 5

Explanation:

i got it right

Answer: The temperature change occurs from heat transfer if the ice melts and becomes liquid water. Similarly, energy is needed to vaporize a liquid, because the molecules in a liquid interact with each other via attractive forces.

Explanation:

Answer:

The answer is below

Explanation:

Charlee's law states that the volume of a gas is directly proportion to the temperature of the gas at constant pressure. That is:

V = kT, where V = volume and T = temperature, k = constant. Therefore:

V / T = k

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

Given that: [tex]V_1=3\ m^3, T_1=20^oC=(20 + 273)K=293\ k,T_2=60^oC=(60 + 273)K=333\ k.\\\\\frac{V_1}{T_1}=\frac{V_2}{T_2}\\\\\frac{3}{293}=\frac{V_2}{333} \\\\V_2=\frac{3}{293}*333\\\\V_2=3.41\ m^3\\[/tex]

The new volume is 3.41 m³. That is it expands by 0.41 m³

Answer:

0.02484

Explanation:

Trust me bro

Answer:

B) 300 J/°C

Explanation:

Q = 3kJ = 3000J

ΔT = 10°C

3000J/10°C = 300J/°C

To calculate heat capacity, use the formula: heat capacity = E / T, where E is the amount of heat energy supplied and T is the change in temperature.

E = 3kJ = 3000J

ΔT = 10°C

Heat capacity = E / T,

3000J/10°C = 300J/°C

"Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature." The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.

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Answer:

When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion. for an example application of expansion and contraction. ... Strain, a material's response to stress, can cause it to deform.

When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion.

Application of expansion and contraction.  Strain, a material's response to stress, can cause it to deform. The study of matter, its nature, and qualities is the subject of physics, which also examines heat, mechanics, light, electricity, magnetism, the structure of atoms, and sound.

In the science of physics, fundamental questions about life are asked, and through observation and investigation, solutions are discovered.

The fundamental problems of life are addressed by physicists using just observational and investigative techniques.

Therefore, When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion.

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Answer:

Qt = 940500 [J]

Explanation:

In order to solve this problem and understand it well, we must analyze that the ice melts or changes phase at a temperature of 0 [°c], then the water at a temperature of 100 [°C] evaporates or changes phase. That is, we have 5 different stages of water (initially in the form of ice), which are:

-) From -30 [°C] to 0 [°C] = Sensible change of temperature

-) At 0 [°C] = Latent heat of melting ice = 334 x 10³ [J/kg]

-) From 0 [°C] to 100 [°C] = Sensible change of temperature

-) At 100 [°C] = Latent heat of fusion for water = 2260 x 10³ [J/kg]

-) From 100 [°C] to 130 [°C] = Sensible change of temperature (superheating)

We can calculate the sensible heat of any process with the following expression:

[tex]Q=m*C_{p}*(T_{f}-T_{i})[/tex]

where:

Q = heat or thermal energy [J]

m = mass of the body or substance = 300 [g]

Cpw = specific heat of the water = 4180 [J/kg*°C]

Cpi = specific heat of the ice = 2090 [J/kg*°C]

Tfinal = final temperature of the process [°C]

Tinicial = initial temperature of the process [°C]

And for some latent heat process, we can calculate the thermal energy using the following expression:

[tex]Q_{lat}=m*Dh_{fus/eva}[/tex]

where:

Dhfus/eva = Fusion heat or latent heat [J/kg]

So, we need to calculate the fice processes.

[tex]Q_{1}=0.3*2090*(0-(-30))\\Q_{1}=18810 [J]\\Q_{2}=0.3*334*10^{3} \\Q_{2}=100200[J]\\Q_{3}=0.3*4180*(100-0)\\Q_{3}=125400[J]\\Q_{4}=0.3*2260*10^{3}\\Q_{4}=678000[J]\\Q_{5}=0.3*2010*(130-100)\\Q_{5}=18090[J][/tex]

And the final step is the sum of all the five heat processes.

[tex]Q_{t}=Q_{1}+Q_{2}+Q_{3}+Q_{4}+Q_{5}\\Q_{t}=18810+100200+125400+678000+18090\\Q_{t}=940500[J][/tex]

Answer:

The initial velocity with which the body was thrown up is 39.2 m/s

Explanation:

The given parameters for the body are;

The time it takes the body to return back to its initial position = 8 seconds

To answer the question, we make use of the kinematic equation of motion, v = u - g·t

Where

v = The final velocity of the body = 0 m/s at the maximum height

u = The initial velocity

g = The acceleration due to gravity = 9.8 m/s²

t = The time in which the body spends in the air

Therefore, at maximum height, we have;

v = 0 = u - g·t

u = g·t

t = u/g

From h = 1/2gt², which gives t = √(2·h/g), the time the body takes to maximum height = The time the body takes to return to its original position from maximum height.

Therefore, the total time in which the body is in the air = 2 × t = 2× u/g

∴

The total time in which the body is in the air = The time it takes the body to return back to its initial position after being thrown = 2 × t =  8 seconds

∴ 2 × t = 8 s = 2 × u/g

8 s = 2 × u/g

u = (8 s × g)/2

∴ u = (8 s × 9.8 m/s²)/2 = 39.2 m/s

The initial velocity with which the body was thrown up = u = 39.2 m/s.

Answer:

The mass of the railroad car is 20,000 kg

Explanation:

Mechanical Force

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

F = ma

Where:

a = acceleration of the object.

m = mass.

F = Net force

The railroad car undergoes an acceleration of [tex]a=2\ m/s^2[/tex] when a net force of F=40,000 N acts upon it.

It's required to find the mass of the railroad car, which can be done by solving the formula for m as follows:

[tex]\displaystyle m=\frac{F}{a}[/tex]

Substituting:

[tex]\displaystyle m=\frac{40,000}{2}=20,000[/tex]

The mass of the railroad car is 20,000 kg

Answer: The distance between particles, and the amount of electric charge they carry.

Explanation:

Charles Coulomb wanted to figure out the strength of the force between two objects and these were the two most independent factors.

Answer:

The sailboats average speed was 13 mph.

Explanation:

To calculate the speed of the boat first calculate the total ammountof hours it took the boat to get to its destination. Then divide 144 by that number which comes out to 13.

The average speed of the sailboat is determined as 12 miles per hours.

The average speed of an object in motion is obtained by dividing the total distance traveled by the object with the time spent in the entire journey.

v = total distance/total time

where;

v = 144/12

v = 12 mph

Thus, the average speed of the sailboat is determined as 12 miles per hours.

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Answer:

The forces are a convergent

Explanation:

Answer: the answer would be methane if the problem is asking for the fastest

Explanation:

Methane (CH₄) is a chemical compound and a primary component of natural gas. The gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.

Methane is formed through various natural processes, including the decay of organic matter in anaerobic (oxygen-deprived) environments such as wetlands, landfills, and the digestive systems of animals.

The speed of sound in a gas depends on factors such as the density and elastic properties of the gas. The molecular composition and temperature of the gas can also affect the speed of sound. In this case, the properties of methane result in a slower speed of sound compared to the other gases mentioned.

Therefore, the gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.

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