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Newton's Third Law of Motion states "To every action, there is an equal and opposite reaction; action and reaction forces act on different bodies".

Answer:

Work Done by the Brakes = - 60000 J

Negative sign indicates the opposite direction of force and displacement.

Explanation:

Assuming that frictional effects are negligible, we can say that all the work done by the brakes is used to stop the car. We can apply law of conservation of energy to this situation as follows:

Work Done by the Brakes = Change in Kinetic Energy

Work Done by the Brakes = Final Kinetic Energy - Initial Kinetic Energy

Final Kinetic Energy of the roller coaster will be 0. Because, the roller coaster will stop finally and its velocity will become zero.

Work Done by the Brakes = 0 J - 60000 J

Work Done by the Brakes = - 60000 J

Negative sign indicates the opposite direction of force and displacement.

Answer:

h₁ = 18 [cm]

Explanation:

This problem can be solved by applying the principles of the static pressure of a liquid column. The key to the solution is to know that the pressure on the horizontal line should be equal for both liquids, this must be met regardless of their density.

[tex]P_{2}=P_{1}\\[/tex]

where:

P₂ = Pressure exerted by the liquid 2 in the given point L₂

P₁ = Pressure exerted by the liquid 2 in the given point L₁

Now we can calculate the pressure in each point using the following expression:

[tex]P_{1}=Ro_{1}*g*h_{1}\\P_{2}=Ro_{2}*g*h_{2}[/tex]

Where:

Ro₁ = density of the liquid 1 = 0.8 [g/cm³]

Ro₂ = density of the liquid 2 = 1.8 [g/cm³]

g = gravity acceleration = 9.81 [m/s²]

h₁ = column of the liquid 1 [m]

h₂ = column of the liquid 2, = 8 [cm] = 0.08 [m]

But first we must convert the units from grams per cubic centimeter to kilograms per cubic meter.

[tex]0.8[\frac{g}{cm^{3}}]*[\frac{1kg}{1000g} ]*[\frac{100^{3}cm^{3} }{1m^{3} } ]=800[kg/m^{3} ]\\1.8[\frac{g}{cm^{3}}]*[\frac{1kg}{1000g} ]*[\frac{100^{3}cm^{3} }{1m^{3} } ]=1800[kg/m^{3} ][/tex]

Now replacing in the first equation:

[tex]800*9.81*h_{1}=1800*9.81*0.08\\h_{1}=\frac{1800}{800} *0.08\\h_{1}=0.18 [m] = 18 [cm][/tex]

Answer:

[tex]h_1 = 18 \: cm[/tex]

Explanation:

See image for explanation

I hope my working is correct.

Answer:

It is whiplash I hope this is right

Answer: 2.5

Explanation:

The mass of bullet = 20kg

The momentum of the bullet = 10kg m/s

The kinetic energy of this bullet in Kj will be calculated as:

= p² / 2m

= 10² /(2 × 20)

= (10 × 10) /(2 × 20)

= 100/40

= 2.5

Therefore, the correct option is C.

Answer:

Ro = 7.8 [g/cm³]

Explanation:

According to the principle of Archimedes, the volume of a body immersed in a liquid is equal to the volume displaced by water. That is, in this problem The displacement volume is equal to the new volume minus the original volume.

[tex]V_{n}=110[cm^{3} ]\\V_{o}=100[cm^{3} ]\\V_{d}=110-100 = 10 [cm^{3} ][/tex]

We now know that density is defined as the relationship between mass and volume.

[tex]Ro = m/V_{d}[/tex]

where:

Ro = density [g/cm³]

m = mass = 78 [g]

Vd = displacement volume [cm³]

[tex]Ro = 78/10\\Ro = 7.8 [g/cm^{3} ][/tex]

Sin is the vertical component. So multiply sin 30 and 14. BOOM! You got the answer.

[tex] \sin(30) \times 14 \: = 7[/tex]

Answer:

stomata to regulate water

specialized cells

Explanation:

Land plants are able to successfully adapt to staying on land through the use of stomata to regulate water loss and through the development of specialized cells that give support to grow erect.

Water regulation is important for the survival of plants on land, otherwise, they may face desiccation as a result of the heat from the sun. The stomata is a structure found on the leaves of land plants that open and close to regulate the amount of water lost to the environment through evapotranspiration. When there is adequate water and the plant can afford to lose some water, the stomata open, otherwise, the stomata close.

Support is also important for land plant's survival and the development of specialized cells in the form of sclerenchyma cells take care of this. The fibers and sclerids are two types of sclerenchyma cells that primarily function to support the land plants.

Answer:

During a typical school day all forms of eneergy is being utilised and also transfer of energy takes place from one form to another.

Explanation:

Chemical energy- A bunsen burner burning a beaker filled with water.

Heat energy- The water in the beaker absorbing the heat from the burner.

Electrical energy- Running Fans and lights in a classroom by switches.

Solar energy- Solar energy harnessed by solar panels to run the fans and lights by converting it into electrical energy.

Potential energy- A ball being held by a student at a certain height possesses energy due to gravity.

Kinetic energy- The same ball being left by the boy from a certain height produces kinetic energy

Answer:

Explanation:

Chemical energy- A bunsen burner burning a beaker filled with water.

Heat energy- The water in the beaker absorbing the heat from the burner.

Electrical energy- Running Fans and lights in a classroom by switches.

Solar energy- Solar energy harnessed by solar panels to run the fans and lights by converting it into electrical energy.

Potential energy- A ball being held by a student at a certain height possesses energy due to gravity.

Kinetic energy- The same ball being left by the boy from a certain height produces kinetic energy

Answer:

Oil Spills.

Explanation:

Answer:

C

Explanation:

Answer:

measurement is the comparison of unknown physical physical quantity with know standard quantity of the same kind .

Answer:

decrease by a factor of 2

Răspuns:

0,98 N

Explicaţie:

Dat fiind:

µ = Coeficientul de frecare = 0,02

Masa (m) = 5 kg

Folosind relația:

Forța de frecare (F) = µ * N

N = reacție normală = masă * accelerație datorată gravitației

Prin urmare,

F = u * m * g

g = 9,8 m / s²

F = 0,02 * 5 kg * 9,8 m / s²

F = 0,98 kgm / s²

F = 0,98N

I've attached the complete question.

Answer:

Option D

Explanation:

From the quartz images attached, we can see they now have different shapes, level of roughness and irregularity. However, the one that will have transported farthest will be option D which is the one that looks circular and has undergone the most abrasion from its body surface and size so far . This is because abrasion is a type of weathering were rocks and sediments wear out their surfaces by grinding out against each other.

The only option that looks to have undergone the most abrasion which means has transported the farthest is the sample in option D

Answer:

she improved upon the works of plato

Answer: A she became a teacher at Alexandria

Explanation:

The KE of a 6 kg mass at 4 m/s will be 48 J. The kinetic energy is obtained, found as the product of mass and the square of the velocity.

The energy possessed by the body by the virtue of motion is known as the Kinetic energy. It is found as the product of mass and the square of the velocity.

The given data in the problem is;

The mass is, m=6 kg

The velocity is,v= 4 m/s

The kinetic energy is found as;

[tex]\rm KE = \frac{1}{2}mv^2 \\\\\ \rm KE = \frac{1}{2}6 (4) ^2\\\\\ KE= 48 \ J[/tex]

Hence, the KE of a 6 kg mass at 4 m/s will be 48 J.

To learn more about the kinetic energy, refer to the link;

https://brainly.com/question/12669551

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Given :

An 80kg sled rider starts sledding down a 100m hill from rest. If her final velocity is 15m/s.

To Find :

The acceleration down the hill.

The force needed for that kind of acceleration.

Solution :

By equation of motion :

[tex]v^2 -u^2 = 2as\\\\a = \dfrac{v^2-u^2}{2s}\\\\a = \dfrac{15^2 -0^2}{2\times 100}\\\\a = 1.125\ m/s^2[/tex]

Force required is, F = ma

F = 80×1.125 N

F = 90 N

Hence, this is the required solution.

Answer:

The Earth's magnetic field protects life on Earth, shielding it from damaging radiation and moderating our climate. So the idea that it could completely flip around, or collapse altogether, should cause us

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Answer:

pls refer to attachments

Answer:

C

Explanation:

Answer:

A) Makes ribosomes

Explanation:

The nucleolus assembles the ribosomes of a cell, which are then sent to the cytoplasm to be used.

Hello!

a)

Use the kinematic equation to solve for the acceleration:

[tex]v_{f} = v_{i} + at[/tex]

In this instance, the final velocity is 0 because he comes to a stop. We can solve for the acceleration by plugging in the given values:

0 = 33 + (12)a

0 = 33 + 12a

-33 = 12a

-33 / 12 = a  --> a = -2.75 m/s²

b) Find the amount of distance necessary to stop. Use the formula:

[tex]v_{f} ^{2} = v_{i} ^{2} + 2ad[/tex]

Plug in the values:

0² = 33² + 2(-2.75 · d)

0 = 1089 - 5.5d

-1089 = -5.5d

d = 198 meters. Therefore, the squirrel would survive.

c)

Find the velocity at 100 meters by using the same formula as before:

[tex]v_{f} ^{2} = v_{i} ^{2} + 2ad[/tex]

However, in this instance, we are solving for the final velocity. Plug in the given points to solve:

vf² = 33² + 2(-2.75 · 100)

vf² = 1089 + (-550)

vf² = 539

vf = √539

vf ≈ 23.22 m/s.

Answer:

Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.

Explanation:

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Answer:

Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.

Explanation:

Answer:

Pressure = 50 N/cm²

Explanation:

Given:

Force = 75 N

Area = 1.5 cm²

Find:

Pressure

Computation:

Pressure = Force / Area

Pressure = 75 / 1.5

Pressure = 50 N/cm²

Answer: He came up with this by using theories like  the photoelectric effect, the second offered experimental proof of the existence of atoms, and the third introduced the theory of special relativity.

Explanation: He was explaing the realationship between energy and mass.

Me: Hope this helps!!! May I have brainlist!?

Answer:

The correct answer is the third option

Explanation:

To reflect means to bounce off. When an incoming ray (called incident ray) gets to a boundary and bounces off the boundary, that is referred to as reflection. However, when an incident ray passes through the boundary and it causes a change in the direction of propagation of the wave, that is referred to as refraction. Thus, the correct option, as explained above, is; In reflection, rays bounce off a boundary, and in refraction, rays pass through a boundary.

Answer:

c

Explanation:

on edge 2020

Answer:

isobaric process

Explanation:

An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV.

Answer:

well for me I think it's

Explanation:

Charles law in gas laws

Answer:

The volume is increased in a ratio of 64/27

Explanation:

The Volume of a Sphere

The volume of a sphere of radius r is given by:

[tex]\displaystyle V=\frac{4}{3}\cdot \pi\cdot r^3[/tex]

If the radius was changed to r', the new volume would be:

[tex]\displaystyle V'=\frac{4}{3}\cdot \pi\cdot r'^3[/tex]

Dividing the latter equation by the first one:

[tex]\displaystyle \frac{V'}{V}=\frac{\frac{4}{3}\cdot \pi\cdot r'^3}{\frac{4}{3}\cdot \pi\cdot r^3}[/tex]

Simplifying:

[tex]\displaystyle \frac{V'}{V}=\frac{r'^3}{r^3}[/tex]

Or, equivalently:

[tex]\displaystyle \frac{V'}{V}=\left(\frac{r'}{r}\right)^3[/tex]

Since r':r = 4:3, thus:

[tex]\displaystyle \frac{V'}{V}=\left(\frac{4}{3}\right)^3[/tex]

[tex]\displaystyle \frac{V'}{V}=\frac{4^3}{3^3}[/tex]

[tex]\displaystyle \frac{V'}{V}=\frac{64}{27}[/tex]

The volume is increased in a ratio of 64/27

Answer:

Explanation:

You don't do the same amount of work. The work formula is F*d = W

W = work

F = force

d = the distance moved.

So you do more work when you move the 10N object because the Force (F) has doubled.