What is the action and reaction if a person takes a step back

Answer:

These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere.

A further region, beginning about 500 km above the Earth's surface, is called the exosphere.

Explanation:

Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot.^_^

Answer:

K = 5706.6 J

Explanation:

Given that,

The mass of a bullet, m = 50 g = 0.05 kg

The velocity of the bullet, v = 720 km/hr = 477.77 m/s

We need to find the kinetic energy of the bullet​. The kinetic energy of an object is due to its motion. It can be given by the formula as follows :

\(K=\dfrac{1}{2}mv^2\\\\=\dfrac{1}{2}\times 0.05\times 477.77 ^2\\\\K=5706.6\ J\)

So, the required kinetic energy of the bullet is equal to 5706.6 J.

Answer:

20 Minutes

Explanation:

Well we know Mph (Miles per hour) is distance over time : \(\frac{distance}{time} \\\)

R (rate) = 60

d (distance) = 20

t (time) = Unknown

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 R = \(\frac{d}{t} \)  

   ↓

60 = \(\frac{20}{t}\)

   ↓

 t = \(\frac{20}{60} \)

    ↓

 t = \(\frac{1}{3} \)  or 0.3333

So basically it would take one third of an hour. Lets change these units to minutes.

60 * 0.333333 = 20

So it would take you 20 minutes to drive 20 miles on a bus that drives 60 mph

Hope that helps

~Siascon~

Answer :

The answer is clearly C

Explanation:

Because the only way currents move are to the side

Dendrimers are the form of nanotechnology is most likely to help improve brain imaging.

Nanotechnology is the near-atomic manipulation of matter to create new structures, materials, and gadgets.

The technique offers scientific improvement in a variety of fields, including medical, consumer goods, energy, materials, and manufacturing.

Dendrites are a kind of nanoparticle that has been studied extensively for a variety of medicinal applications, including medication administration, imaging, and diagnostics in the brain.

Hence,dendrimers are the form of nanotechnology is most likely to help improve brain imaging.

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Answer:

B. Quantum Dots

Explanation:

Nanotechnology with quantum dots allows for better imaging while examining the body.

Answer:

volume of substance of weight of mercury is 13593 kilograms

Answer:

B. silicate rocks and metals

Terrestrial planets, such as Earth, are primarily composed of silicate rocks and metals. The correct answer is b. silicate rocks and metals.

Silicate rocks, which are made up of silicon and oxygen, are the dominant building blocks of these planets. They include minerals like quartz, feldspar, and mica. Terrestrial planets contain significant amounts of metals such as iron, nickel, and other heavy elements. These metals are found in the planet's core, providing structural strength and contributing to the planet's magnetic field.

This composition differentiates terrestrial planets from gas giants like Jupiter and Saturn, which are predominantly composed of hydrogen and helium. The combination of silicate rocks and metals forms the solid, rocky surfaces that characterize terrestrial planets.

Therefore, The correct answer is b. silicate rocks and metals.

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Giannis' new velocity is -0.5 m/s Here, we will use the law of conservation of momentum which states that the total momentum of a system of objects remains constant provided no external force acts on them. So, before and after the collision the total momentum of the system will remain constant.

We can write this as:p(before collision) = p(after collision)According to the question, LeBron James (object 1) who has a mass of 113.4 kg, runs down the court at 1.3 m/s. As he nears the basket, he is gaurded by Giannis Antetokounmpo (object 2) who has a velocity of -0.7 m/s. Giannis and LeBron collide under the net, causing both of them to bounce off each other. If LeBron's new velocity after the collison is -1.0 m/s.Now, the total momentum before collision is:p(before collision) = m1v1 + m2v2p(before collision) = 113.4 × 1.3 + 109.7 × (-0.7)p(before collision) = 147.42 – 76.79p(before collision) = 70.63 kg m/s

The total momentum after the collision is:p(after collision) = m1v1' + m2v2'p(after collision) = 113.4 × (-1.0) + 109.7 × v2'p(after collision) = -113.4 + 76.79p(after collision) = -36.61 kg m/sAccording to the law of conservation of momentum:p(before collision) = p(after collision)70.63 kg m/s = -36.61 kg m/sNow, we will calculate Giannis' new velocity using the equation:p(before collision) = p(after collision) => m1v1 + m2v2 = m1v1' + m2v2'v2' = (m1v1 + m2v2 - m1v1') / m2v2' = (113.4 × 1.3 + 109.7 × (-0.7) - 113.4 × (-1.0)) / 109.7v2' = -0.5 m/sTherefore, Giannis' new velocity is -0.5 m/s.

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It will take approximately 1.67 seconds for the car to go from a speed of 20.0 m/s to a speed of 25.0 m/s if the acceleration is 3.0 m/s².

\(v = u + at\)

Given:

u = 20.0 m/s (initial velocity)

v = 25.0 m/s (final velocity)

a = 3.0 m/s² (acceleration)

Rearranging the equation, we get:

\(t= \frac{(v - u)}{a}\)

Substituting the given values:

t =  \(\frac{(25.0 m/s - 20.0 m/s)}{3.0 m/s^{2} }\)

t = 1.67 s

Speed is the measure of the rate at which an object moves. It is defined as the distance an object travels per unit of time. Speed is a scalar quantity and is expressed in units of distance per unit of time, such as meters per second (m/s) or kilometers per hour (km/h). It is important to note that speed does not tell us anything about the direction of motion or any changes in direction. This is where velocity comes in, which is a vector quantity that includes both speed and direction.

Speed can be either average or instantaneous. Average speed is the total distance traveled divided by the total time taken, while instantaneous speed is the speed at a particular instant in time. Speed can also be described in terms of velocity, which includes direction as well as magnitude.

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Answer:

true

Explanation:

because global helps local

Given that the total weight of a 4 ft by 8 ft sheet of 1/2" plywood that has two small 12 in by 18 in openings near the center is to be determined.

We have that plywood is 3 psf per square inch of thickness. Total area of the sheet = 4 × 8 = 32 sq. ft.The area of both openings = 2 × 12 × 18 = 432 sq. in.Total area of both openings = 432/144 = 3 sq. ft.Therefore, area of plywood sheet without openings = 32 - 3 = 29 sq. ft.Volume of the plywood = (1/2)" × 29 sq. ft. × (144 sq. in./1 sq. ft.) = 2088 cu. in.Weight of the plywood = 2088 cu. in. × 3 lbs./cu. in. = 6264 lbs.Now we need to find the weight of openings.

The openings are located at the center of the plywood sheet, so we can treat them as a part of the plywood sheet. Therefore, thickness of the sheet is still 1/2".So, weight of the openings = 3 sq. ft. × (1/2)" × 3 lbs./sq. in. = 6.75 lbs.Total weight of plywood sheet with two small 12 in by 18 in openings near the center = weight of the plywood + weight of the openings= 6264 lbs. + 6.75 lbs.≈ 6271 lbs.≈ 6240 lbs.Choice B. 48 lbs is incorrect.Choice A. 43.5 lbs is incorrect.Choice C. 87 l is incorrect.

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Answer:

Explanation:

An atom losses or gains electrons to fill the outermost shell. In this process , ionic bonds are formed. Chemical bonds are formed when electrons are shared.

Answer:

Explanation:

\(a = \frac{v_f-v_0}{t}\) which is the final velocity minus the initial velocity in the numerator, and the change in time in the denominator.  For us:

\(a=\frac{2.7-1.6}{1.2}\) so

a = .92 m/s/s (NOT negative because you're speeding up)

The neutral conductors of different systems should be identified to distinguish the systems by using different colors, by using a tag, or by using other effective means.

The neutral conductors of different systems should be identified to distinguish the systems by using different colors, by using a tag, or by using other effective means. This is to ensure the correct neutral conductor is connected to the correct system and to prevent any confusion when wiring. For example, if a neutral conductor from a 120V system and another from a 240V system are installed in the same raceway, cable or enclosure, they should be identified as such to prevent any wiring mistakes.

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When we convert 4900mm from two-step dimensional analysis it would be 490 cm and 5.59kL to 5923.667 quarts.

Dimensional Analysis is a technique for analysis where physical quantities are expressed in terms of their basic dimensions and is frequently applied when there is insufficient data to create accurate equations.

As given in the problem we have to convert

4900mm to cm

As we know that there  are 1000 mm in 1 m

1000 mm = 1 m

4900 mm = 4.9 m

1 m = 100 cm

4.9 m = 4.9×100

          =490 cm

As we have to convert 5.59kL to quarts

1 Kiloliter =  1056.69 US liquid quart

5.59kL    = 5.59 ×1056.69 quarts

               =5923.667 quarts

Thus, we converted 4900mm to 490 cm and 5.59kL to 5923.667 quarts.

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Answer: D

Explanation: I saw it in a bill nye video.

Lifetimes of high-mass stars are shorter than those of low-mass stars.

A star's ability to convert its hydrogen to helium will increase with mass.In spite of having more fuel, it turns that out high mass stars burn up that fuel considerably more rapidly than low mass stars.Hence, low mass stars live a lot longer than higher molecular stars do!

Of all the sources of energy in the cosmos, low-mass planets are the ones that live the longest.Although though they outnumber all the other stars by a wide margin, they are the faintest, making them difficult to see.Some low-mass stars have a trillion-year life span.

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Answer:

I think it is behavioral

Answer:

xaubUajnaai ajn AJ au aun a

Explanation:

ahayba uabah an aj

The critical angle for light traveling from the liquid back into the air is 42.0°.

The critical angle is the angle of incidence in the first medium (air) at which all of the light is refracted into the second medium (liquid).

The formula for the critical angle is:

sin(c) = n₂/n₁

where:

c is the critical angle

n₂ is the index of refraction of the second medium

n₁ is the index of refraction of the first medium

In this case:

n₁ = 1.00

n₂ = 1.33

Substituting these values into the formula:

sin(c) = 1.33/1.00

c = sin⁻¹(1.33/1.00)

c = 42.0°

Therefore, the critical angle for light traveling from the liquid back into the air is 42.0°.

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No mechanical energy is transferred to thermal energy, but saw that at least a little mechanical energy is lost as heat.

1. Due to the vertical oscillation of the pluck connected with the spring, the spring is getting compressed and elongated. There are inter atomic bonds of the material with which the spring is made of. When the spring is getting compressed or elongated atoms connected with inter atomic bonds also gets compressed for elongated. This causes some of the bonds to break.

We know each bond is having some internal energy stored in it. So when the bond breaks that internal energy is emits in the form of thermal energy. Hence we see that some of the energy of oscillation is getting used in breaking the bond. This mechanical energy is getting lost. So with each period of oscillation the energy associated with the oscillating spring mass system decays with time.

Hence the amplitude of oscillation also decrease with time. Since by applying a certain amount of force to the pluck we are getting little small displacement compared to the actual displacement hence the corresponding spring constant will also be different compared to the actual one.

2. We know the spring constant is here define as the the ratio of applied force with the displacement of the mass. Here the force is  the resultant of the weight of the mass and the the buoyancy force on the mass by the liquid. But when we sublimate the mass inside the liquid it loses mass with time. Hence the force on the spring also decays with time. Hence the the displacement of the mass also decays with time. Which implies the spring constant also changes.

Thermal power refers back to the energy contained inside a device this is liable for its temperature. warmness is the go with the flow of thermal electricity. an entire branch of physics, thermodynamics, offers with how heat is transferred among specific systems and how paintings is accomplished within the method (see the 1ˢᵗ law of thermodynamics).

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The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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No. Frequency and speed are completely unrelated concepts. How frequently something occurs is not the same as how quickly. In the universe, at least in the four dimensions that we can understand, there is a speed limit set by the speed of light.

The frequency of a repeated event is its number of instances per unit of time. In some cases, it is also referred to as temporal frequency or ordinary frequency to emphasize differences with spatial and angular frequencies, respectively. In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time. The pace of direction changes in current per second is known as frequency. It is expressed in hertz (Hz), a unit of measurement that is used internationally. One hertz is equivalent to one cycle per second. A cycle is one whole alternating current wave.

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The complete equations are:

The difference that might exist between any two points. The amount of work required to move a unit positive charge along any path from one point to another without accelerating is referred to as the electric field.

The external effort required to move a charge in an electric field from one position to another is known as an electric potential difference or voltage.

Therefore, the formula are:

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plants

i hope its right and have a nice day

Answer:

number 1

Explanation:

To find the cross product of vectors D and E, we can use the formula:

D × E = (Dy * Ez - Dz * Ey)i - (Dx * Ez - Dz * Ex)j + (Dx * Ey - Dy * Ex)k

Given:

D = -5i + 6j - 3k

E = 7i + 8j + 4k

Calculating the cross product:

D × E = ((6 * 4) - (-3 * 8))i - ((-5 * 4) - (-3 * 7))j + ((-5 * 8) - (6 * 7))k

     = (24 + 24)i - (-20 - 21)j + (-40 - 42)k

     = 48i + 41j - 82k

To show that D is perpendicular to E, we need to demonstrate that their dot product is zero. The dot product is given by:

D · E = Dx * Ex + Dy * Ey + Dz * Ez

Calculating the dot product:

D · E = (-5 * 7) + (6 * 8) + (-3 * 4)

     = -35 + 48 - 12

     = 1

Since the dot product of D and E is not zero, it indicates that D and E are not perpendicular to each other. Therefore, D is not perpendicular to E.

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The horizontal velocity of the projectile it leaves the launcher is 0.283 m/s.

The horizontal speed of a projectile is regular, and there's a vertical acceleration because of gravity; its cost is 9.8 m/s/s, down, The vertical speed of a projectile changes via nine.8 m/s every second, The horizontal motion of a projectile is impartial to its vertical movement.

Projectile motion is a form of motion experienced with the aid of an object or particle that is projected in a gravitational field, such as from Earth's floor, and movements alongside a curved route below the action of gravity best.

Projectile motion is the movement of an object thrown (projected) into the air. After the initial force that launches the item, it most effectively reports the pressure of gravity. The object is known as a projectile, and its route is called its trajectory.

Calculation:-

Horizontal distance = 40 cm

                          = 0.4 m

height of table = 10 m

Let vertical velocity is 0.

S = ut +1/2 at²

10 = 0 + 0.5 × 10 t²

t² = 10/5

t    = 1.414 sec.

At the same time, it will take to cover a horizontal distance of 0.4 m.

Velocity = distance/time

                = 0.4/1,414

                  = 0.283 m/s

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Answer:

This question is incomplete, the options are:

A) The object absorbs most white light and refracts most green light.

B) The object refracts most white light and absorbs most green light.

C) More green light is absorbed while more red and blue light is reflected.

D) More green light is reflected while more red and blue light is absorbed.

The answer is D.

Explanation:

Light is an electromagnetic wave that contains different colours at different wavelength. The colour of light that is seen depends on the wavelength of light that is REFLECTED, while other wavelengths of light are ABSORBED. This feature is dependent on the properties of each object that received the sunlight.

For example, an object will appear GREEN because it has properties that enables it to REFLECT most of the GREEN LIGHT but absorbs most of the RED AND BLUE LIGHT in the sunlight passing through the object.

Answer:

D

Explanation:

More green light is reflected while more red and blue light is absorbed.