I need help with nine and 10 I will really appreciate it

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The Correct statement is :

An atomic nucleus contains most of the atom’s mass.

Answer:

an atomic nucleus contains most of the atoms mass

Answer:

Both are attractive as well as repulsive.

Explanation:

(Like poles repel, like charges repel; unlike poles attract, unlike charges attract).

There are two types of charges that form electric fields: positive and negative charges. Magnetic fields are formed by charges and are related with two magnetic poles, north and south (but moving charges).

The attraction and repulsion of electric charges produce both electric and magnetic fields.

The force released by magnets when they attract or repel each other is known as magnetism. An electric force is the attracting or repulsive interaction between any two charged things.

Similarities are as follows:

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If the torque is held constant but a much smaller rotating platform is used, the moment of inertia of the system would decrease.

This is because moment of inertia is directly proportional to the mass and the distance from the axis of rotation. Since the mass of the platform would be smaller and its distance from the axis of rotation would be smaller, the moment of inertia would decrease.  According to Newton's second law, the angular acceleration is directly proportional to the net torque and inversely proportional to the moment of inertia. Therefore, if the moment of inertia decreases, the angular acceleration would increase. This means that the angular acceleration would be higher if a much smaller rotating platform is used while holding the torque constant.  In summary, using a much smaller rotating platform while holding the torque constant would result in a lower moment of inertia and a higher angular acceleration.

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Answer:

its 2.9

Explanation:

Took the quiz

The race horse will take a time of 2.9 seconds to starts from rest and accelerates at rate of 4.7 m/s² to travel a distance of 20 m.

Acceleration is a physical quantity measuring the rate of change in velocity of a moving body. Acceleration is a vector quantity thus having both magnitude and direction.

The expression relating the distance travelled s , initial velocity , acceleration a and time t is written below:

s = ut + 1/2 at²

Here, the horse starting from rest and u = 0.

Given  a = 4.7 m/s²

s = 20 m

Then t = √(2 s/a)

t = √(2 × 20 m/ 4.7 m/s²) = 2.9 s

Therefore, the horse will take 2.9 seconds to accelerates from rest.

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Answer: They have different rigidities.

Explanation:

Answer:

A

Explanation:

Because D is definitely true and there is only one false sentence what means if that non of B or C is false because if one is false so other one needs to be too.

The mass and energy of the wood before burning would be equal to the energy and matter of the ash, soot, heat and light after burning.

The law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.

While burning of wood, the chemical energy in the wood is released as heat because of the chemical reaction of wood and oxygen.

This type of chemical reaction is called combustion and it requires oxygen. Combustion converts the stored chemical energy in the wood into heat and light energy.

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Answer:

Sun's Gravitational Pull

Explanation:

Planets revolve around the sun because of the Sun's gravitational pull pulling all the planets to revolve around it.

Answer:

3.44 s

Explanation:

Given:

Δx = 45.8 m

v₀ = 19.8 m/s

a = -3.77 m/s²

Find: t

Δx = v₀ t + ½ at²

45.8 = 19.8 t + ½ (-3.77) t²

45.8 = 19.8 t − 1.885 t²

1.885 t² − 19.8 t + 45.8 = 0

t = [ -b ± √(b² − 4ac) ] / 2a

t = [ 19.8 ± √((-19.8)² − 4 (1.885) (45.8)) ] / 2(1.885)

t = [ 19.8 ± √(392.04 − 345.332) ] / 3.77

t = 3.44 or 7.06

The first time, 3.44 seconds, is correct.

The second time is the time it would take the car to return to 45.8 m if it continued decelerating after stopping.

Answer:

TO answer this question i need wave speed

Explanation:

Answer:

Summary notes really help and make sure to revise on past papers.Good luck

Explanation:

Give me a like if this helped

The relationship between the angles of incidence and refraction when a light ray passes across the boundary between two media with differing refractive indices is described by Snell-Descartes law.

Snell's law

n₁sinθ₁ = n₂sinθ₂

In the following equation, n1 and n2 stand for the refractive indices of the two media. θ₁ for angle of incidence (the angle between the incident ray and the normal to the boundary), and θ₂ for angle of refraction (the angle between the refracted ray and the normal to the boundary). Sometimes referred to as Snell-Descartes law, in its mathematical form.

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The spacecraft's orbital period is approximately 8 years. This means it takes the spacecraft about 8 years to complete one full orbit around the Sun while studying the asteroid belt at a distance of 4 AU.

The orbital period of a spacecraft placed in an orbit of 4 astronomical units (AU) to study the asteroid belt can be determined using Kepler's Third Law of Planetary Motion. This law states that the square of the orbital period (T) of a celestial body is proportional to the cube of the semi-major axis (a) of its orbit.

In mathematical terms, Kepler's Third Law is represented as:

T² ∝ a³

To find the orbital period, we can use the relationship between the Earth's orbital period and its distance from the Sun. Earth's orbital period is 1 year and its distance from the Sun is 1 AU. Therefore, we have:

T² / (1 year)² = (4 AU)³ / (1 AU)³

Solving for T:

T² = (4³) * (1²)
T² = 64
T = √64
T ≈ 8 years

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Recall the formula of refractive index

\(\sf \mu =\dfrac{sini}{sinr}\)

As per the diagram

At AD angle of incidence i is

\(\\ \rm\Rrightarrow \gamma=sin^{-1}\left(\dfrac{1}{\dfrac{n_1}{n_2}}\right)\)

\(\\ \rm\Rrightarrow \gamma=sin^{-1}\left(\dfrac{n_2}{n_1}\right)\)

At AB's imaginary boundary line

Use snell's law

\(\\ \rm\Rrightarrow \dfrac{\mu_1}{\mu_2}=\dfrac{sin\alpha}{sin\beta}\)

\(\\ \rm\Rrightarrow \mu_1sin\alpha=\mu_2sin\beta\)

\(\\ \rm\Rrightarrow n_2sin\alpha=n_1sin\left(\dfrac{\pi}{2}-\gamma\right)\)

\(\\ \rm\Rrightarrow n_2sin\alpha=n_1cos\left(sin^{-1}\left(\dfrac{n_2}{n_1}\right)\right)\)

\(\\ \rm\Rrightarrow sin\alpha=\dfrac{n_1}{n_2}cos\left(sin^{-1}\dfrac{n_2}{n_1}\right)\)

\(\\ \rm\Rrightarrow \underline{\boxed{\bf{\alpha=sin^{-1}\left[\dfrac{n_1}{n_2}cos\left(sin^{-1}\dfrac{n_2}{n_1}\right)\right]}}}\)

Option A

The force exerted by the rain on the patch is 0.231 N.

The force exerted by the raindrops on the patch can be found using the formula; F = m × v

where F will be the force, m will be the mass of each raindrop, and v is velocity of each raindrop.

The mass of each raindrop is given as 1.1 grams, which can be converted to kilograms by dividing by 1000;

m = 1.1 g / 1000 = 0.0011 kg

The velocity of each raindrop is given as 6 m/s.

Now, we need to determine the number of raindrops that strike the patch in one second. If the patch is receiving 35 raindrops per second, then the number of raindrops that strike the patch in one second is also 35.

Therefore, the total force exerted by the rain on the patch is;

F = m × v × n

where n will be the number of raindrops per second.

Plugging in the values, we get;

F = 0.0011 kg × 6 m/s × 35

F = 0.231 N

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We cannot determine the speed at which a star in the galaxy is moving away from us based on its mass, luminosity, age, or color alone. it is false

The speed at which a star in the galaxy is moving away from us is determined through the measurement of its spectrum using a technique known as redshift.

When a star or galaxy moves away from us, its light is shifted towards longer wavelengths, resulting in a redshift. By analyzing the degree of redshift, astronomers can estimate the speed at which the star is receding.

However, factors such as mass, luminosity, age, and color do not provide direct information about the star's motion away from us.

These characteristics are important for studying other properties of stars, such as their composition, brightness, evolutionary stage, and temperature. To determine the motion of a star in the galaxy, redshift measurements are essential.

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Answer:

There are many different policies that can be used to deal with automobile emission pollution. Some of the most efficient policies include:

Incentivizing the purchase of electric vehicles. Electric vehicles produce zero emissions, so they can significantly reduce air pollution. Governments can incentivize the purchase of electric vehicles by offering tax breaks or other financial incentives.

Reducing the number of cars on the road. One of the best ways to reduce automobile emissions is to reduce the number of cars on the road. This can be done by promoting public transportation, biking, and walking.

Improving the fuel efficiency of cars. Cars that are more fuel-efficient produce fewer emissions. Governments can improve the fuel efficiency of cars by setting stricter fuel economy standards.

Reducing the use of gasoline. Gasoline is a major source of emissions. Governments can reduce the use of gasoline by promoting the use of alternative fuels, such as ethanol and biodiesel.

Enforcing emissions standards. Governments can enforce emissions standards by requiring car manufacturers to meet certain emissions levels.

These are just a few of the policies that can be used to deal with automobile emission pollution. The most efficient policy will vary depending on the specific circumstances.

Explanation:

Answer: It has the skill to nest

sorry if I'm wrong

Answer:

B: A colorful beak

Explanation:

i hope this helped!

ANSWER

EXPLANATION

Parameters given:

Speed of electron, v = 4.10 * 10^3 m/s

Magnetic field, B = 1.45 T

Magnetic force, F = 1.40 * 10^(-16) N

To find the angle that the velocity of the electron makes with the magnetic field, apply the formula for magnetic force:

where θ = angle

q = electric charge = 1.6 * 10^(-19) C

Make θ the subject of the formula:

Therefore, the angle that the velocity makes is:

To find the second angle, subtract the angle from 180 degrees:

The angles are:

The given differential equation is:

dQ/dt = -0.04Q

where Q is the quantity of the toxic chemical and t is time in years.

To solve this differential equation, we can use separation of variables:

dQ/Q = -0.04 dt

Integrating both sides, we get:

ln|Q| = -0.04t + C

where C is the constant of integration. To find the value of C, we can use the initial condition that the initial leak is 60 kg:

ln|60| = -0.04(0) + C

C = ln|60|

Substituting this value of C back into the general solution, we get:

ln|Q| = -0.04t + ln|60|

Simplifying, we get:

ln|Q/60| = -0.04t

Exponentiating both sides, we get:

Q/60 = e^(-0.04t)

Multiplying both sides by 60, we get the final solution:

Q = 60e^(-0.04t)

Therefore, the quantity of the toxic chemical present at any time t (measured in years) after the initial leak is:

Q(t) = 60e^(-0.04t)

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Answer:

Explanation:

Given:

r = 5·10⁻⁵ m

q₁ = q₂ = | 1.602·10⁻¹⁹ | C - electron charge modulus

k = 8.99·10⁹  m² / C₂  -   the Coulomb’s constant

_______________

F - ? - electron repulsion force

According to Coulomb's law:

F = k·q² / r²

F = 8.99·10⁹·(1.602·10⁻¹⁹)² / (5·10⁻⁵)² ≈ 9,23·10⁻²⁰  N

Answer:

To find the average distance of the numbers you provided (255cm, 242cm, 245cm), you can add all the numbers together and divide by the number of numbers in the set.

In this case, you would add 255cm + 242cm + 245cm = 742cm, and then divide by 3 (the number of numbers in the set) to get an average distance of 244cm.

You can also use this formula: (255 +242 + 245) /3 = 244

Answer:4

Explanation:

If the velocity of an airplane is doubled, then its kinetic energy will increase by a factor of four.

The ability of an object to do work by virtue of its motion.

The kinetic energy is represented mathematically as

K.E = 1/2 mv²

where v is the velocity with which the object is moving and m is its mass.

When the velocity is doubled, kinetic energy is

K.E' = 1/2 m(2v)²

K.E' =4 x ( 1/2 mv²)

Thus,  airplane's kinetic energy will increase by a factor of four.

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The child should be at a distance of \(13.8 * 10^{6} m\) from center of earth.

We know that gravity at height h is given by , \(g = \frac{GM}{(r+h)^{2} }\)

where, G = gravitational constant = \(6.67 * 10^{-11}\)

           M = mass of earth = \(5.98 * 10^{24} kg\\\)

            r = radius of earth = \(6.371 * 10^{6} m\)

     let g = \(9.8 m/s^{2}\)

           h = distance from center of earth

The value of g is inverse to the height above the earth’s surface; therefore, it decreases with increasing height.

Putting these values in above equation we get, h = \(13.8 * 10^{6} m\)

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i. The elasticity at point \( g \) is the measure of responsiveness or sensitivity of a quantity to changes in another variable at point \( g \).

ii. To determine the elasticity at point \( h \), we first need to establish what quantity we are referring to at point \( h \). Once we have identified the relevant quantity, we can then calculate its elasticity by measuring the responsiveness or sensitivity to changes in another variable at point \( h \).

i. To determine the elasticity at point \( g \), we need specific information about the variables and their relationship. Elasticity is typically calculated as the percentage change in one variable divided by the percentage change in another variable.

ii. Without additional information about the specific variables and their relationship at point \( h \), it is difficult to provide a precise answer. The concept of elasticity requires specific context and variables to be defined in order to calculate or describe it accurately.

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The angular velocity of the object is (V) is v(t) = at.

What is velocity?

The speed of something in a given direction. Velocity is the directional speed of to an object in motion as an indication of its rate of the  change in position as in observed from a particular to frame of reference and it's as measured by a particularly standard of time.

Sol-As per the newton's first law of motion.

Vt= vo+at

Here,

Velocity at time t is v(t).

Initial velocity is vo.

Acceleration is a and the time is t.

The initial velocity is zero. Put the 0 for vo in above equation.

v(t) = 0+at

v(t)= at

Thus, the acceleration of a falling body (a), the time it takes to fall (t), and its instantaneous velocity when it hits the ground.

(V) is v(t) = at.

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Answer:

  3.6 kN

Explanation:

Given a giant squid has a mass of about 0.37 tons, you want its weight in newtons.

Weight in newtons is the force that results from the acceleration of a mass by gravity.

  F = ma

  F = (0.37 Mg)(9.8 m/s²) ≈ 3.6 kN

__

Additional comment

We can multiply 0.37 t = 370 kg by g = 9.80655 m/s² to get 3628.4605 N. However, the mass is given to 2 significant figures, so the product cannot be more precise than 2 significant figures. That is why we rounded it to 3600 N or 3.6 kN.

1 Mg is 1000 kg, or 1 t (metric ton)

Answer: Yes the further the sun is away the longer the shadow is. At noon,the shadow is the shortest because its straight up above you. If this helps pls mark brainliest!

Answer:

Further the sun, the longer the shadow; true.