What is air??????????????

Answer:

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Answer:

Hiii , how are you holding up with corona?

Explanation:

The magnification of 100x would be considered a low power magnification.

Low power magnification refers to magnifications that are less than 100x. This type of magnification is typically used for overviews of larger objects, like leaves or rocks, or for scanning an area of a specimen to locate finer structures of interest.

Low power magnifications are generally easier to use and have a wider field of view, making it easier to observe larger structures and identify overall patterns and shapes. The use of low power magnification can also reduce the chances of damaging delicate specimens or structures, since the lower magnification reduces the amount of strain placed on the object being viewed.

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The average power developed by the cheetah during the acceleration phase can be calculated using the formula for power, which involves the work done and the time taken.

By determining the work done on the cheetah and dividing it by the time taken, we can find the average power in watts and horsepower. The work done on an object is given by the formula W = F * d, where F is the force applied and d is the distance covered. In this case, the force can be calculated using Newton's second law, F = m * a, where m is the mass of the cheetah and a is its acceleration. The distance covered can be calculated using the formula d = (1/2) * a * t^2, where t is the time taken.

By substituting the values and calculating the work done, we can then divide it by the time taken to find the average power developed by the cheetah. The power can be expressed in watts (W) and converted to horsepower (hp) using the conversion factor: 1 hp = 745.7 W.

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Answer:

Explanation:

equal in magnitude and opposite in direction

Answer:

i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii)  Find the value of k first: F = 400 + k(15^2)                                              k = 28/9    F = 400 +(28/9)(30^2) = 320

Explanation:

Answer:

Ordovician

Explanation:

Answer:

Ordovician: 470 million years ago

The motion of one particle of a gas is unaffected by the motion of other particles of the gas unless the particles collide.

Heat is the primary cause of particle motion on Earth. The temperature of any substance is correlated with the energy of the atoms and molecules that comprise it. Energy is conserved, thus if one particle loses energy, another one acquires it.

The components of matter are also continually in motion. They are energetic in motion. The kinetic theory of matter states that all matter is made up of particles that are constantly moving.

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The conduction velocity of the axon is 0.4 m/s.

Conductive velocity = Distance / Time

= 20 cm / 50 milliseconds

= 0.4 m/s

The conduction velocity of an axon is determined by its diameter and its degree of myelination. Myelin is a fatty sheath that surrounds axons and helps to insulate them, which speeds up the conduction of action potentials.

Unmyelinated axons have a conduction velocity of about 0.5 to 10 m/s, while myelinated axons can have a conduction velocity of up to 150 m/s.

The conduction velocity of axons is important for the nervous system to function properly. It determines how quickly signals can travel from one part of the body to another.

For example, the conduction velocity of axons in the spinal cord determines how quickly pain signals can travel from the skin to the brain.

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Answer:

The scale would exert a force of approximately 519.4 Newtons on the 53 kg person standing on it while the elevator is in motion at a constant speed of 2.0 m/s.

Explanation:

The gravitational force acting on the person can be calculated using the formula: force = mass * acceleration due to gravity.

Given that the mass of the person is 53 kg, and the acceleration due to gravity on Earth is approximately 9.8 m/s², we can calculate the force:

force = 53 kg * 9.8 m/s² = 519.4 N.

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Refraction results from differences in light's speed. The correct answer is C) speed.

Refraction is the term for the bending of light as it passes through transparent materials (it also occurs with sound, water, and other waves). We are able to create lenses, magnifying glasses, prisms, and rainbows because to this bending caused by refraction.

Refraction occurs when light passes through different mediums and changes its speed. This change in speed causes the light to bend, creating the effect of refraction.

This is why objects appear to be in different positions when viewed through water or a lens. The frequency and incident angles of the light do not affect refraction, only the speed of the light does.

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Answer:

Explanation:

To find the volume of the object we use the formula

volume of object = final volume of water - initial volume of water

From the question

final volume of water = 86 mL

initial volume of water = 75 mL

So we have

volume of object = 86 - 75

We have the final answer as

Hope this helps you

Answer:

the rocks have different layers to them which can contain fossils and different kinds of rocks

Answer:

Explanation:

As per the given information, 18(O) is struck by a proton, and 18(F) and another particle are produced. The reaction has a Q value of -2.453 MeV, and the atomic mass of 18(O) is 17.999 160 u.

We have to find the atomic mass of 18(F). The Q value of a nuclear reaction can be given as Q = (Mi - Mf - Mp) × c²WhereQ = Q

value of the nuclear reaction = initial massMf = final massMp = mass of the projectile = speed of light

The Q value of the given nuclear reaction is -2.453 MeV. Since we know the initial mass (Mi) and the mass of the projectile (Mp), we can calculate the final mass (Mf) as follows: Mf = Mi - Mp - (Q / c²)Now, let's calculate the final mass of 18(F).

Initial mass (Mi) = mass of 18(O) = 17.999 160 UMass of the projectile (Mp) = mass of a proton = 1.007 825 uQ value (Q) = -2.453 MeVSpeed of light (c) = 2.998 × 10⁸ m/sMf = 17.999 160 u - 1.007 825 u - (-2.453 MeV / (2.998 × 10⁸ m/s)²)Mf = 18.000 674 therefore, the atomic mass of 18(F) is 18.000 674 u.

The magnitude of the average force exerted by the block on the bullet during that time is 202,304.147m N (m stands for bullet mass)

We got some values here,

v = 439 m/s

t = 2.17 ms = 2.17 × \(10^{-3}\) s

First, we should find the acceleration of the car. We assume that final speed of bullet after impact is 0 m/s, so here we go

a = v/t

a = \(v_{1}\) - \(v_{0}\) / \(t_{1}\)  - \(t_{0}\)

a = 0 - 439 / 2.17 × \(10^{-3}\)  - 0

a = -439 / 2.17 × \(10^{-3}\)

a = -439,000 / 2.17

a = -202,304.147 m/\(s^{2}\)

What actually happens when the result is negative is not the acceleration after the bullet hits the target, but the deceleration.

Now we got the amount of deceleration. We can found the force by the formula of: F = m.a but in the question there is no mass value of the bullet. So, we can answer this question by this way (we can ignore negative values)

F = m.a

F = m × 202,304.147 m/\(s^{2}\)

F = 202,304.147m N

Acceleration (a) is the change of velocity (Δv) over the change of time (Δt), and here is the formula, a = Δv/Δt. This formula allows you to measure how quick velocity changes in meters per second squared (m/s. Acceleration is also a vector quantity, so it includes both magnitude and direction.

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Answer:

The Tesla moves approx. 25 meters from rest before reaching 60 mi/hr

Explanation:

Given:

Initial velocity = 0 m/s

Final velocity = 26.8 m/s

Time = 1.9 seconds

Acceleration = change in velocity/time

\(a = \frac{26.8}{1.9}\)

The equation to find displacement (Δx) with given starting and final velocity, time, and acceleration is:

\(x = x_{0} + v_{0}t + \frac{1}{2} at^{2}\)

Starting position and initial velocity both equal 0, so

\(x = \frac{1}{2} at^{2}\)

\(x=\frac{1}{2} (\frac{26.8}{1.9})(1.9)^{2}\)

x = 25.46m

Rounded to the nearest whole number, x = 25m

The x y and x−y are the two diagonals of the parallelogram whose sides are x and y.

Let's begin with the given statement that "if x and y are vectors in r2, then x y and x−y are the two diagonals of the parallelogram whose sides are x and y". Now,

let's try to prove the statement. To prove the statement that x y and x−y are the two diagonals of the parallelogram whose sides are x and y, we will first prove that these two vectors bisect each other.

Thus, we can say that the mid-point of x+y will be equal to the mid-point of x-y. Let's try to prove it by calculating the mid-points:

Mid-point of x+y is= [(x+y)/2]

Mid-point of x-y is= [(x-y)/2]

Now, let's add both the above equations:

(x+y)/2 + (x-y)/2= x/2 + y/2= (x+y)/2

This proves that the mid-point of x+y will be equal to the mid-point of x-y.

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Answer:

When you take the compass away from the bar magnet, it again points north. So, we can conclude that the north end of a compass is attracted to the south end of a magnet. ... In Experiment 2, when you move the north pole of a magnet toward the south pole of the other magnet, the two magnets attract.

Answer:

1.

Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years.

2.

Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth's night sky. The name means "glowing" in Greek — a fitting description, as only a few planets, the full moon and the International Space Station outshine this star.

Answer:

Sirius is the brightest star in the night sky

Explanation:

The name means 'glowing' in greek

Answer:

C. An article written by a scientist

Explanation:

Research-based original articles written by a scientist can act as a primary source of information. Textbooks, dictionaries and encyclopedias are generally classified as secondary sources and are rarely primary sources.

The constant angular acceleration of the rotating wheel is 8.21 rad/s².

We can use the equations of rotational motion to find the constant angular acceleration. The first equation relates angular displacement (θ), initial angular velocity (ω₀), final angular velocity (ω), and angular acceleration (α):

θ = ω₀t + (1/2)αt²

In this case, the initial angular velocity (ω₀) is 0 rad/s (since the wheel starts from rest), the final angular velocity (ω) is 97.0 rad/s, and the time (t) is 7.00 s. Since the wheel completes 30.0 revolutions, the angular displacement (θ) can be calculated as:

θ = 2πn

where n is the number of revolutions. Substituting the given values, we have:

2πn = 97.0 rad/s × 7.00 s + (1/2)α(7.00 s)²

Since the wheel completes 30.0 revolutions, n = 30.0. Rearranging the equation, we can solve for α:

α = (2πn - 97.0 rad/s × 7.00 s) / (0.5 × (7.00 s)²)

Plugging in the values, we find:

α = (2π × 30.0 - 97.0 rad/s × 7.00 s) / (0.5 × (7.00 s)²) ≈ 8.21 rad/s²

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Explanation:

t = usin©/g

Where t is the time to reach the maximum height

Time spent in air is T = 2t

Hence, T = 2usin©/g

T = 2 x 20 x sin 65°/ 9.8

T = 3.69s

The ball travelled approximately 18.7 meters.

We can use the following kinematic equation to calculate the distance the ball travelled:

v² = u² + 2as

Where

Substituting the given values, we get:

15² = 1² + 2(6)s

225 = 1 + 12s

224 = 12s

s = 224/12

s ≈ 18.7

Therefore, the ball travelled approximately 18.7 meters.

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Answer:

Explanation:

A Solid is one of the three main states of matter. By definition a solid is something whose molecules are so densely packed together that it allows it to keep its shape. Therefore if the item has a definite shape that does not change on it's own it is a solid. As opposed to a liquid which will take and fill the shape of it's container.

The resulting equation of motion for the system is given by m × x''(t) + k × x(t) = f(t), which is 2 × x''(t) + 18 * x(t) = 2 * sin(2t).

What is  equation of motion?

The equations of motion are a set of mathematical relationships that describe the motion of objects under the influence of forces. There are different sets of equations of motion, depending on the specific scenario and the type of motion being considered (linear motion, projectile motion, circular motion, etc.). The equations of motion for linear motion, also known as the equations of uniformly accelerated motion.

To find the equation of motion for the system, we start with Newton's second law of motion, which states that the sum of forces acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the object is the 2-kg mass attached to the spring.

The force exerted by the spring is proportional to the displacement of the mass from its equilibrium position, and it can be expressed as F_spring = -k× x(t), where k is the spring constant and x(t) is the displacement of the mass at time t.

In addition to the force exerted by the spring, there is an external force f(t) = 2 ×sin(2t) acting on the mass.

Applying Newton's second law, we have the equation of motion: m ×x''(t) + k ×x(t) = f(t).

Substituting the given values, m = 2 kg and k = 18 N/m, we obtain 2 ×x''(t) + 18 × x(t) = 2 ×sin(2t).

Therefore, the resulting equation of motion for the system is 2 × x''(t) + 18 × x(t) = 2 × sin(2t).

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Answer:

One second is defined by taking the fixed numerical value of the caesium frequency ∆ν, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 (9.192631770 x 10⁹ ) cycles of the radiation, when expressed in the unit Hz, which is equal to s−¹.

One second is equal to 1/86,400 of a mean solar day.

The work done by the three students is 3,000 J.

The energy transferred in the process is 3,000 J.

W = Fd

The work done by the three students is calculated as follows;

W = 300 x 10

W = 3,000 J

The energy transferred in the process is determined by work energy theorem.

E = W

E = 3,000 J

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