what are the first 20 elements and their chemical symbols​

Answer:

Explanation:

Definition: Noise pollution is generally defined as regular exposure to elevated sound levels that may lead to adverse effects in humans or other living organisms.

Measures to be taken:

The watercraft with an initial velocity of 6.4 m/s and an average acceleration of 2.0 m/s2 [s] for 2.5 s will have a final velocity of: 11.4 m/s

The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:

vf = vi + (a* t)

Where:

Information about the problem:

Applying the final velocity formula, we have:

vf = vi + (a* t)

vf = 6.4 m/s + (2.0 m/s²* 2.5 s)

vf = 6.4 m/s + 5 m/s

vf = 11.4 m/s

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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Answer:

Assumption: the acceleration of this bus is constant while the brake was applied.

Acceleration of this bus: approximately \(\left(-6.0\; \rm m \cdot s^{-2}\right)\).

It took the bus approximately \(1.7\;\rm s\) to come to a stop.

Explanation:

Quantities:

Consider the following SUVAT equation:

\(\displaystyle x = \frac{1}{2}\, \left(a\, t^2\right) + u\, t\).

On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:

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

Therefore, replace the quantity \(t\) with the expression \(\displaystyle \left(\frac{v - u}{a}\right)\) in that SUVAT equation:

\(\displaystyle x = \frac{1}{2}\, \left(a\, \left(\frac{v -u}{a}\right)^2\right) + u\, \left(\frac{v - u}{a}\right)\).

Simplify this equation:

\(\begin{aligned}x &= \frac{1}{2}\, \left(a\, {\left(\frac{v -u}{a}\right)}^2\right) + u\, \left(\frac{v - u}{a}\right) \\ &= \frac{1}{2}\left(\frac{{(v - u)}^2}{a}\right) + \frac{u\, (v - u)}{a} =\frac{1}{a}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)\end{aligned}\).

Therefore, \(\displaystyle a= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)\).

In this question, the value of \(x\), \(u\), and \(v\) are already known:

Substitute these quantities into this equation to find the value of \(a\):

\(\begin{aligned} a &= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right) \\ &= \frac{1}{10\; \rm m}\times \left(\frac{{\left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)}^2}{2} + \left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)\times 10\; \rm m \cdot s^{-1}\right)\\ &\approx -6.0\; \rm m \cdot s^{-2}\end{aligned}\).

(The value of acceleration \(a\) is less than zero because the velocity of the bus was getting smaller.)

Substitute \(a \approx -6.0\; \rm m \cdot s^{-2}\) (alongside \(u = 10\; \rm m \cdot s^{-1}\) and \(v = 0\; \rm m \cdot s^{-1}\)) to estimate the time required for the bus to come to a stop:

\(\begin{aligned}t &= \frac{v - u}{a} \\ &\approx \frac{0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}}{-6.0\; \rm m \cdot s^{-2}} \approx 1.7\; \rm s\end{aligned}\).

The correct prediction about the angular momentum and rotational kinetic energy of the sphere-rod system immediately before the collision and immediately after the collision is: Before the collision, the sphere has linear momentum (mass mo multiplied by velocity to) while the rod has zero angular momentum since it is at rest.

After the collision, the sphere and rod form a single system, and the conservation of angular momentum dictates that the final angular momentum of the system should equal the initial angular momentum of the sphere. Therefore, the sphere-rod system will have non-zero angular momentum after the collision.

Regarding rotational kinetic energy, before the collision, the sphere has linear kinetic energy (1/2 mo * to²) and the rod has zero rotational kinetic energy. After the collision, the sphere-rod system will have rotational kinetic energy (as they both rotate around the pivot with a common angular velocity). Due to the inelastic nature of the collision, some linear kinetic energy from the sphere will be converted to rotational kinetic energy in the sphere-rod system, but not all of it, as some energy will be lost as heat and sound during the collision.

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Answer:

A = 4.6 [m²]

Explanation:

The area of a circle can be calculated by means of the following equation.

\(A=\frac{\pi }{4} *D^{2}\)

where:

A = area [m²]

D = diameter = 2.42 [m]

Now replacing:

\(A=\frac{\pi }{4} *(2.42)^{2} \\A = 4.6 [m^{2} ]\)

The statement "The Earth is floating in space" is FALSE in Anaximander's cosmology.

Anaximander, an ancient Greek philosopher, proposed a cosmological model that differed from the statement given in option d. According to Anaximander's cosmology, the Earth is not considered to be floating in space. Instead, his model described the Earth as being embedded within rotating rings and cylinders that contained celestial bodies such as the Sun, Moon, stars, and planets.

Anaximander's cosmology was geocentric, meaning it placed the Earth at the center of the universe. The Earth was believed to be a flat, circular disk supported by pillars. The celestial bodies, including the Sun, Moon, stars, and planets, were thought to be situated in separate concentric rings or cylinders surrounding the Earth, with each celestial body having its own ring or cylinder.

Therefore, the statement that is FALSE regarding Anaximander's cosmology is d. The Earth is not described as floating in space but rather as being embedded within rotating rings and cylinders containing other celestial bodies.

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Answer

the answer is 6.25

Explanation:

Here, the mass of the stone (m) = 0.5 kg, velocity at which it is thrown (v) = 5 m/s, The kinetic energy of the stone (KE) =? We have, Kinetic energy of the stone (KE) = \ (\frac12mv^21) = \(\frac120.5\times5^2\) = 6.25 Joules Hence, the kinetic energy of the stone (KE) is 6.25 joules. Hope it will be helpful

Answer:

positive acceleration.

Explanation:

As its slowing down gradually, its positive acceleration. When the ball slows down, its acceleration vector is in the opposite direction of its motion. Therefore positive acceleration.

The given problem involves the calculation of the wavelength of light based on the interference pattern formed on a screen by a double slit. We are given the distance between the screen and the double slit (5.65 m), the distance between the two slits (0.050 mm), and the position of the first dark fringe on the screen (5.70 cm from the center line).

To solve for the wavelength of light, we can use the equation for the distance between adjacent bright or dark fringes:

λ = (d * D) / x

Where λ is the wavelength of light, d is the distance between the slits, D is the distance between the screen and the double slit, and x is the position of the fringe.

Plugging in the given values:

d = 0.050 mm = 0.000050 m
D = 5.65 m
x = 5.70 cm = 0.057 m

λ = (0.000050 m * 5.65 m) / 0.057 m
λ ≈ 4.949 m

The wavelength of light is approximately 4.949 meters.

However, the given answer states that the wavelength is about 562 nm. This is incorrect, as the calculated value is in meters. The correct conversion from meters to nanometers is multiplying by 10^9. Thus, the correct wavelength is approximately 4.949 * 10^9 nm or 4949 nm.

Therefore, the wavelength of light is approximately 4949 nm, not 562 nm as mentioned in the given answer.

Please let me know if I can help you with anything else.

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The wavelength of the monochromatic light used in the experiment is approximately 562 nm.

Explanation :

The given information allows us to calculate the wavelength of the monochromatic light used in the double-slit experiment.

To find the wavelength, we can use the equation for the fringe spacing in a double-slit interference pattern:

λ = (dsinθ) / m

Where:
λ is the wavelength of light
d is the distance between the two slits (0.050 mm, or 0.050 × 10^(-3) m)
θ is the angle between the central maximum and the mth order dark fringe (in this case, the 1st dark fringe, which is 5.70 cm from the center line on the screen)
m is the order of the dark fringe (in this case, m = 1)

First, let's convert the distance between the 1st dark fringe and the center line on the screen to meters:
5.70 cm = 5.70 × 10^(-2) m

Now, we can calculate the angle:
sinθ = (5.70 × 10^(-2) m) / 5.65 m

Next, we can substitute the values into the equation and solve for λ:
λ = [(0.050 × 10^(-3) m) × (5.70 × 10^(-2) m)] / 5.65 m

Calculating this expression will give us the wavelength of the light, which is about 562 nm.

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Answer:

Anything that has motion cannot be stopped

Explanation:

Answer:

equal and opposite reaction

Explanation:

The piece of evidence that suggests that the inner planets were formed from the same rotating cloud of gas and dust is that the planets orbit the sun in the same direction and in the same plane

Smaller planets like Mercury, Venus, Earth, and Mars are considered inner planets. Mercury is thought to be the smallest inner planet, with Earth being the largest. The vastly larger outer planets, such as Jupiter, Saturn, Uranus, and Neptune, are the opposite.

A route that an object or planet in space follows around another body is referred to as an orbit. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.

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The toddler's change in velocity in metres per second is 1.68 m/s

To answer the question, we need to know what acceleration is

Acceleration is the change in velocity of an object with time. It is given by

a = Δv/Δt where

Making Δv subject of the formula, we have

Δv = aΔt

Since the toddler's accleration is 0.24 m/s² and got up from a nap and ran for 7.0 seconds,

Substituting the values of the variables into the equation, we have

Δv = aΔt

Δv =  0.24 m/s² × 7.0 s

Δv =  1.68 m/s

So, the toddler's change in velocity in metres per second is 1.68 m/s

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The magnitude of the rock's (assumed) uniform acceleration is v² - 225.

Initial speed, u = 15 m/s

Displacement, s = 50 cm = 0.5 m

Magnitude of acceleration, a = ?

We know, v² - u² = 2as

Let's substitute the given values into the above formula. v² - u² = 2as (v is the final velocity)

Final velocity, v = ?u = 15 m/s (Initial velocity)

s = 0.5 m (Displacement)

a = ?

v² - u² = 2as (v² - u²)/2s = a(v+u)/2(a = (v² - u²)/2s)

(a = (v² - u²)/2s)(a = (v² - (15 m/s)²)/2(0.5 m))(a = (v² - 225)/1)(a = v² - 225)

Therefore, the magnitude of the rock's  uniform acceleration is v² - 225, given that a rock hits the ground at a speed of 15 m/s and leaves a hold 50 cm deep after it hits the ground.

The magnitude of the rock's  uniform acceleration is v² - 225.

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Answer:

C

Explanation:

Multiple choice

Rounding to two decimal places, the height of the cliff is approximately 88.2 meters.

To calculate the height of the cliff, we can use the equations of motion for free fall. When an object is dropped from rest, its motion can be described by the following equation:

\(h = (1/2) * g * t^2\)

where:

h = height (or distance) fallen,

g = acceleration due to gravity (approximately 9.8 m/s^2 on Earth),

t = time of fall.

Given that the stone falls for 4.2 seconds before hitting the ground, we can plug in these values into the equation to find the height of the cliff:

\(h = (1/2) * 9.8 * (4.2)^2\\h = (1/2) * 9.8 * 17.64\\h = 5 * 17.64\\ h \approx 88.2m\)

Rounding to two decimal places, the height of the cliff is approximately 88.2 meters.

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Complete question is:

A stone is dropped from the top of a cliff. It is seem to hit the ground below after 4.2sec. How high is the cliff ?

a. 88.2m

b. 860m

c. 160m

d. 180m

Explanation:

i think it the central nervous system

Answer:

3

Explanation:im almost certain thats what it is

The parakeets swing with a frequency of approximately 1.14 Hz.

The frequency at which the two parakeets swing on the swing can be determined by considering the relationship between the period of oscillation and the length of the pendulum.

The period of a pendulum is the time it takes for one complete oscillation, while the frequency is the reciprocal of the period, representing the number of oscillations per unit time.

In this case, we are given the distance of the combined center of mass of the parakeets below the pivot, which is 19.5 cm.

To find the frequency, we need to calculate the length of the equivalent pendulum, which is the distance from the pivot point to the combined center of mass of the parakeets.

Assuming the length of the equivalent pendulum is L, we can substitute the given values into the formula for the period of a pendulum, T = 2π√(L/g), where π is a constant (approximately 3.14159) and g is the acceleration due to gravity (approximately 9.8 m/s^2).

Converting the distance from centimeters to meters, we have L = 0.195 m. Substituting the values into the formula, we obtain T = 2π√(0.195/9.8).

Simplifying the equation, we have T = 2π√(0.02), which evaluates to approximately 0.879 s.

To calculate the frequency, we take the reciprocal of the period: f = 1/T = 1/0.879 ≈ 1.14 Hz.

Therefore, the parakeets swing with an approximate frequency of 1.14 Hz.

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Harlow Shapley studied globular clusters, measured distances to them, analyzed their distribution, and performed calculations which showed Sun is not at the center of the Milky Way.

Harlow Shapley made several important observations that indicated that the Sun is not at the center of the Milky Way. Here's a step-by-step explanation of his findings:

1. Shapley studied globular clusters, which are large groups of stars densely packed together in a spherical shape. He noticed that these clusters were not distributed uniformly around the Sun.

2. He measured the distances to these globular clusters using a method called the period-luminosity relation of Cepheid variable stars, which allowed him to determine their distances from the Sun based on their brightness and pulsation periods.

3. By analyzing the distribution of globular clusters, Shapley found that they were concentrated in one region of the sky, which indicated the presence of the Milky Way's center.

4. His calculations showed that the Sun is located about 30,000 light-years away from the center of the Milky Way, rather than being at the center as previously believed.

In conclusion, Harlow Shapley's observations of globular clusters and their distribution in the sky led him to the realization that the Sun is not at the center of the Milky Way, but rather at a significant distance from it.

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Answer:

there is not enough information

The true azimuth of the AB alignment is 91º 52' (east of north), the magnetic azimuth is 100º 22' (east of north), and the grid azimuth is 108º 52' (east of north).

To find the true azimuth, magnetic azimuth, and grid azimuth of the AB alignment, we need to consider the magnetic declination. The magnetic declination indicates the angle between true north and magnetic north at a specific location. In this case, the magnetic declination is 8º 30' E, which means that the magnetic north is 8º 30' east of the true north.

To calculate the true azimuth, we subtract the magnetic declination from the grid azimuth. The grid azimuth is given as 100º 22', so subtracting the magnetic declination of 8º 30' E gives us a true azimuth of 91º 52' (east of north).

The magnetic azimuth remains the same as the grid azimuth, which is 100º 22' (east of north).

The grid azimuth is calculated by adding the magnetic declination to the true azimuth. Since the magnetic declination is east, we add it to the true azimuth. Adding 8º 30' E to the true azimuth of 91º 52' gives us a grid azimuth of 108º 52' (east of north).

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The work done when a forklift raises a 400N object through a height of 2m is 800 Joules.

Given: Force required to raise an object through a forklift(F)=400N

           height of the object till which it is required to be raised(r)= 2m

Work is the product of the component of the force in the direction of the displacement and the magnitude of this displacement.

The quantity F·dr=F dr cosФ is called the work done by the force F on the particle during the small displacement dr.

Ф - the angle between the applied force and the direction of motion.

The work done on the particle by a force F acting on it during a finite displacement is obtained by,

                  W= ∫ F. dr= ∫F cosФ dr

To calculate work done we use the formula,

             W= Force×displacement×cosФ

cosФ= 0 (as the force is acting vertically upwards and the direction of motion is also upwards so the angle between the force and the direction of motion is 0).

putting the values in the formula,

                 W=400×2×cos0

                 W=800×1            [cos0=1]

                 W=800Joules

Therefore, the work done when a forklift raises a 400N object through a height of 2m is 800 Joules.

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Answer:

c. Y

Explanation:

Newton's third law of motion states that action and reaction are equal and opposite. Hence for every action, there is an equal and opposite reaction.

Considering the system of forces shown in the image, W and Y are  opposite forces. When the driver slams on the brakes, he will be pushed forward towards the windscreen. The force Y exerted by the seat belt keeps him on the drivers seat by moving him backwards towards the seat.

Answer:

the magnetic dipole moment caused by orbiting electrons

Explanation:

In relation to an observer, it takes 2.3727*10^-8 seconds at rest. to exist as you see it. Because cosmic radiation that strikes the atmosphere produces a particle known as a kaon.

Radiation from space is one natural source of radiation. High-energy charged particles, x-rays, and gamma rays are all components of cosmic radiation, which are created in space. The earth receives secondary radiation that is created when charged particles interact with the atmosphere. The stars, including our own sun, emit cosmic radiation. A particle is a small, localized item that can have many physical or chemical qualities, such as volume, density, or mass. The term particle—or corpuscule in older texts—is used in the physical sciences. The size or number of them varies widely.

T = t/(1-(v^2/c^2)

^1/2 = 1.375*10^-8/0.5795

T = 2.3727*10^-8sec

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Answer:

1.matter made of mass and volume

2.matter is any substance that has mass and takes up a space by having a volume

3.table, coffee, and perfume

4.solid has a strong bonds, liquid has weak bond, and gas no bond

5

The unit of measure that represents frequency and is expressed as the number of cycles per second is Hertz (Hz).

Hertz is a derived unit of measure that is used to quantify the frequency of vibrations, waves, and oscillations. It represents the number of cycles of a wave that occur in one second. For example, if a sound wave completes 440 cycles in one second, it is said to have a frequency of 440 Hz. The Hertz unit is named after the German physicist Heinrich Hertz who first demonstrated the existence of radio waves.

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Answer:

a + b = c      where a and b and c are vector quantities

Since c is the result of adding vector b to vector a (to add two vectors the vectors are connected head to tail)

a^2 + b^2 - 2 ab cos θ = c^2 is an expression of such a relationship

Note that a^2 + b^2 = c^2 if a and b are at right angles to one another

Another way to express this is:

a x + b x = c x    where a and b are the x-components of a and b

a y + b y = c y      describes the y -components of a and b

The above two equations will provide the x and y components of vector c

Answer:

I'm sorry I

Explanation:

I don't know I'm sorry I will tell you another answer