Why are two permanent magnets attracted to each other?.

If one ball's initial speed was 1.50 m/s , and the other's was 2.20 m/s in the opposite direction, There velocities after collision will be - 2.2  m/s and  - 2.9 m/s  

given :

masses of both the balls are same

using conservation of momentum

m1u1 + m2u2 = m1v1 + m2v2

m1 ( 1.50 ) + m2 * (-2.20) = m1v1 + m2v2

m (1.50) + m ( -2.20) = mv1 + mv2

-0.7 = v1 + v2         equation 1

since

u1 + v1 = u2 + v2

1.50 + v1 = (-2.20) + v2

v1 - v2 = - 3.7            equation 2

solving equation 1 and 2 we get

v1 = - 2.2  m/s

v2 = - 2.9 m/s

There velocities after collision will be - 2.2  m/s and  - 2.9 m/s  

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The kinetic energy at the bottom of the ramp is 2205 J.

The kinetic energy of an object is the electricity that it possesses because of its motion. Tt is defined because the work needed to accelerate a body of a given mass from rest to its stated velocity. Having won this power for the duration of its acceleration, the body maintains this kinetic electricity until its pace adjusts.

Kinetic energy is a form of strength that an object or a particle has by means of the cause of its motion. If work, which transfers electricity, is done on an object by way of applying an internet force, the item quickens and thereby gains kinetic electricity.

Calculation:-

KE = decrease in potential energy

= mg(h2 - h1)

= 75 * 9.81 * ( 4 - 1)

= 2205 J

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Answer:

Explanation:

The mass of the emitted particle is the smallest in beta decay.

Beta decay is the flow of electrons, alpha decay is the flow of helium nuclei

During alpha decay, the mass of the emitted particle is the smallest compared to other types of radioactive decay.

In alpha decay, an unstable atomic nucleus emits an alpha particle, which consists of two protons and two neutrons bound together, effectively forming a helium-4 nucleus. This means that the alpha particle has a mass of approximately 4 atomic mass units (AMU).

In contrast, beta decay involves the emission of beta particles, which can be either beta-minus particles (electrons) or beta-plus particles (positrons). These particles have much smaller masses compared to alpha particles. For example, a beta-minus particle (electron) has a mass of approximately 0.00055 AMU, and a beta-plus particle (positron) has the same mass but opposite charge.

Gamma decay, on the other hand, does not involve the emission of particles with mass but instead releases high-energy photons (gamma rays) to stabilize the nucleus.

Hence, the alpha particle emitted during alpha decay has the smallest mass among the particles emitted during radioactive decay processes.

During alpha decay, the mass of the emitted particle is the smallest compared to other types of radioactive decay.

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Answer:

Secondary succession

Explanation:

Answer:

C  and D

Explanation:

Electrostatic force =  C q1 q2 / r^2

C = coulomb's constant      q = charge    r = distance between charges

   so you can see that   C and D will increase the force

An ecosystem is made of different species of animals, plants and the resources for their living. If we observe our surroundings, we can see many more types of living things with their own peculiarities.

Ecosystems in earth contains the region where living things and major resources exists. There are different ecosystems namely, forests,  aquatic systems, deserts, gralsslands, marshy lands etc.

If we observe around there are various kinds of plants and animals in water bodies as well as in land. They can their characteristic features and adapting powers.  They can be of same species or different, social living or isolated living.

We can classify water bodies as one ecosystem and land area and grass lands as other ecosystems.

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The formula used is related to echo formula under sound. The speed of light V is 2.9 × 10^8 m/s

Speed can simply be defined as distance travelled per time taken. it is a scalar quantity and it is measured in m/s

Given that a laser beam from Earth is reflected back from a mirror on the Moon in 2.60 s. If the distance between Earth and the Moon is 3.85 × 108 m.

The speed of light V = 2d/T

Where

Substitute all parameters into the formula

V = (2 × 3.85 × 10^8) / 2.6

V = 7.7 × 10^8 / 2.6

V = 296153846.2

V = 2.9 × 10^8 m/s

Therefore, the speed of light is  2.9 × 10^8 m/s

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The reaction force applied by the floor of the elevator on the cardboard box is 93.1N.

The mass of the cardboard box is 4.75 kg.

The elevator is moving in the upward direction with an acceleration of g.

According to Newton's law of motion, each and every action has an equal and opposite reaction.

Now, the reaction force that is going to be applied on the box by the floor of the accelerating elevator will be equal to that of the weight of the box felt by the floor of the elevator.

The net acceleration of the box is (g+g),

Net acceleration = 2g.

Now, the weight W of the boc,

W =4.75(2g)

W = 4.75 x 2 x 9.8

W = 93.1 N.

The reaction force Fₙ₂ on the box is 93.1 N.

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Complete question-A cardboard box rest on the floor of the elevator. The box has a mass m = 4.75 kg and the elevator has an upward acceleration a,  if the elevator's acceleration had a magnitude of g in the upward direction, what would the normal force fn2 be in newtons?

The rate of increase in balloon radius is 0.12 cm/s.

Solution:

r^3 = 24×3/4

r^3= 18

r= √18

r= 2.62cm

∴ the rate of change in radius here is 2.62cm/s since π is constant.

The surface area of the sphere= 4πr^2

the surface area of the balloon is 30πcm^2

therefore 30π= 4πr^2

divide both sides by 4π

r^2= 30/4

r^2= 7.5

r=√7.5

r= 2.74cm

The rate of change in radius here is 2.74cm/s

As altitude increases atmospheric pressure decreases. The pressure on the outside of the balloon then drops. In order to balance the external pressure, the gas inside expands and lowers the pressure. Therefore, the size of the balloon increases. Gas particles exert pressure on the walls of the gas-filled container. When you inflate a balloon the air inside expands and exerts pressure on the walls of the balloon. This will increase the size of the balloon.

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Thank you for the pointsss

A horizontal, 250-foot-long, 4-inch-diameter hose must have a minimum pressure of 65 psi at the outlet end (2) in order to comply with fire safety regulations.

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Answer:

thw answer is given on the photo above.. this is a very simple question based on force chapter of physics

125.85 Kg mass value would occupants of planet X determine.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

mass = weight/acceleration

mass = 920/7.31 = 125.85 kg

mass = 125.85 Kg

125.85 Kg mass value would occupants of planet X determine.

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Glycolysis, a pathways for the flow of electrons from glucose to oxygen in aerobic respiration.

The process of obtaining chemical energy for the body in the form of ATP is called respiration. In the process, chemical bond energy stored in various molecules is reduced or oxidized. The most commonly used substrate in this pathway is glucose.

Glucose is first converted to two molecules of pyruvate by a pathway known as glycolysis. The pyruvate produced is converted to acetyl-CoA and enters the Krebs cycle. In the Krebs cycle, acetyl-CoA is oxidized to form CO2, ATP, NADH and FADH2. NADH and FADH2 are used as reducing forces within the electron transport chain or ETC, oxidizing various enzymes and coenzymes within the ETC to synthesize ATP.

Therefore, the correct sequence of processes involved in aerobic cellular respiration is glycolysis, the Krebs cycle, and the electron transport chain.

So the correct answer is "glycolysis, Krebs cycle, electron transport system".

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If the painter weighs 55.0 kg and the ladder weighs 12.0 kg, and the ladder starts to slide at the base when her feet are 70% of the way up the length of the ladder, The coefficient of static friction between the ladder and the floor is 0.5.

The resistance people feel when they try to move something that is stationary on a surface without actually moving their bodies or the surface they are trying to move it on.

n = F[tex]_{GY}[/tex]

F[tex]_{s} ^{max}[/tex] = F[tex]_{GX}[/tex]

F[tex]_{GY}[/tex] = μ[tex]_{s}[/tex] n

F[tex]_{GX}[/tex] = μ[tex]_{s}[/tex] F[tex]_{GY}[/tex]

Sum of horizontal forces is 0 = F[tex]_{GX}[/tex] -F[tex]_{W}[/tex] = 0

∴ F[tex]_{GX}[/tex] = F[tex]_{W}[/tex]

Sum of vertical forces is 0 = F[tex]_{GY}[/tex] - mg -Mg = 0

F[tex]_{GY}[/tex] = g (m+M)

Total torque at point a (foot of ladder) = 0

hence,

mg (1.5) + Mg(2.1) - F[tex]_{W}[/tex](4) =0

mg (1.5) + Mg(2.1) = F[tex]_{W}[/tex](4)

mg (1.5) + Mg(2.1) = F[tex]_{GX}[/tex](4)

mg (1.5) + Mg(2.1) = μ[tex]_{s}[/tex] F[tex]_{GX}[/tex](4)

mg (1.5) + Mg(2.1) = μ[tex]_{s}[/tex] g(m+M) (4)

μ[tex]_{s}[/tex] = [tex]\frac{mg (1.5) + Mg(2.1)}{4g(m+M)}[/tex]

μ[tex]_{s}[/tex] = [tex]\frac{12 (1.5) + 55(2.1)}{4(12+55)}[/tex]

μ[tex]_{s}[/tex] = 0.5

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Answer:

Below

Explanation:

Fn = Normal force = (5  + 10) ( 9.81 ) = 147.15 N      (Contact force)

Friction force = 147.15 * .2 = 29.43 N

Net force causing boxes to move = 45 - 29.43 = 15.57 N

F = m * a

15.57  = ( 5+10) * a      shows  a = 1.038 m/s^2

A transformer has 620 turns in the primary coil and 68 in the secondary coil. Step-down transformer is the type of transformer utilized.

In the fields of electricity and electronics, transformers are a common tool. It is an electromagnetic gadget that utilizes the fundamental electromagnetism theory developed by Michael Faraday.

Exactly the opposite of a step-down transformer is a step-up transformer. Using a step-up transformer, the low primary voltage is raised to a high secondary voltage. Once more, it is accomplished by the proportion between primary and secondary windings.

Reduction in height Both the electrical and electronic fields require transformers. A step-down transformer lowers the voltage across the secondary output from the primary voltage level.

Here,

no. of turns in primary coil = N[tex]_{p}[/tex] = 620

no. of turns in secondary coil = N[tex]_{s}[/tex] = 68

hence, N[tex]_{p}[/tex] > N[tex]_{s}[/tex]

so, the given transformer is step down transformer.

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We can conclude that Wemadeit is closer to our Sun than Waytoofar.

What is parallax angle ?

The parallax angle is the angle between the Earth one season of the year and the Earth six months later, as measured from a nearby star. Astronomers use this angle to determine the distance of this star from Earth. How do scientists measure this angle and from this information how do they know the distance to the star?

Since the earth revolves around the sun every year, every half year (6 months) it will be on the opposite side of what it was half a year ago. Because of this, nearby stars appear to move relative to distant "background" stars. You can see this effect when driving in the countryside. Nearby traffic signs appear to be moving fast, while distant buildings/trees, etc. appear to be moving slowly, but the sun is not moving at all! It wouldn't have happened otherwise.) Another example:

Hold the pencil at arm's length and look with one eye, then the other. Note that it changed position but didn't actually move. Your eyes model different locations on the earth. First on one side of the sun (nose), then on the other. Astronomers look up at the sky on a specific date and six months later to see how far nearby stars appear to be moving against the background. The angles at which these astronomers measure the motion of stars are actually the same angles they would see the motion of the Earth if they could travel to the stars. Scientists know how far the Earth has traveled in her six months (twice as much as the Sun does), so they have all the information they need to determine the distance to a star.

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The net acceleration of a basketball where resisting forces are null is 18m/s².

Principle & Calculations-

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If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, peak velocity of the star would increase in the observed doppler shift of the star.

fo = [ ( v + vo ) / v + vs ) ] fs

fo = Observer frequency of sound

v = Speed of sound waves

vo = Observer velocity

vs = Source velocity

fs = Actual frequency of sound waves

If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, time between peaks in the velocity of the star would decrease in the observed doppler shift of the star. This means that the peak velocity of the star would increase.

Therefore, the change in the observed doppler shift of the star is that the peak velocity of the star would increase.

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The decibel level that will be recorded by a table of 100 library patrons each whispering at 30 decibels is 50 decibels.

From the information, the relative intensity is 100. This can be illustrated as 10². Therefore, t = 2. Now the logarithm of the relative intensity is increased by 2 units.

The decibel will be:

= 10 × 2

= 20 units.

Therefore, the decibel level that will be recorded by a table of 100 library patrons will be:

= 20 + 30

= 50 decibels.

Therefore, the decibels level is 50 decibels.

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Answer:

1.96 m^2

Explanation:

F = m * a

10 = 5.1 * a

a = 1.96 m/s^2

A statute may be subject to the President's veto in the executive branch, but with enough votes, the legislative branch can override the veto.

Thus this is how President's powers are checked.

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The tension in the string = 83.2 N

Tension is defined as the pulling force transmitted axially by using a string, a rope, chain, or similar object, or by each end of a rod, truss member, or similar 3-D object; tension might also be expressed as the action-reaction pair of forces acting at each end of said elements. Tension is the opposite of compression. All objects in contact with each other exert forces on each other. The best example of pulling force is seen when pulling on a rope. When a pulling force is applied to a rope, it creates considerable tension.

Given,

Mass of object (m) = 0.650kg

Radius of object (r) =  0.5 m

Angular speed (ω) = 8.00 rad/s

T = mω²/r

T = 0.65 × 8²/0.5

T = 83.2 N

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A sports car accelerates from 0 to 27 m/s. The mass of the car is  732.5kg.

initial speed of a car = 0m/s

final speed of the car = 27m/s

time taken = 6.3 seconds

then acceleration is calculated as:

acceleration = velocity / time

acceleration = (27 - 0)/6.3 = 27/6.3 = 4.24m/s²

The force exerted y a car = 3106 N

as we know

F = ma

where

F = force exerted

m = mass of the body

a = acceleration of a car

F = ma

3106N = m x 4.24m/s²

m = 3106 /4.24

m = 732.5kg

A sports car accelerates from 0 to 27 m/s. The mass of the car is  732.5kg.

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Answer:

[tex]60\; {\rm ft \cdot s^{-1}}[/tex].

Explanation:

Let [tex]a[/tex] denote the acceleration of this car; [tex]a = (-18)\; {\rm ft \cdot s^{-2}}[/tex]. Note that acceleration [tex]a\![/tex] measures the rate of change in velocity. Since this car is slowing down, acceleration [tex]a\!\![/tex] will be negative.

Let [tex]x[/tex] denote the displacement of the car. It is given that [tex]x = 100\; {\rm ft}[/tex] as the car braked.

Let [tex]v[/tex] denote the velocity of the car after braking. Since the car has stopped, [tex]v = 0\; {\rm ft \cdot s^{-1}}[/tex].

Let [tex]u[/tex] denote the initial velocity of the car. Apply the SUVAT equation [tex]v^{2} - u^{2} = 2\, a\, x[/tex] to find the value of [tex]u\![/tex]. Rearrange this equation to obtain:

[tex]u^{2} = v^{2} - 2\, a\, x[/tex].

[tex]\displaystyle u = \sqrt{v^{2} - 2\, a\, x}[/tex].

Substitute in [tex]v = 0\; {\rm ft \cdot s^{-1}}[/tex], [tex]a = 18\; {\rm ft \cdot s^{-2}}[/tex], and [tex]x = 100\; {\rm ft}[/tex] to find the value of [tex]u[/tex]:

[tex]\begin{aligned} u &= \sqrt{v^{2} - 2\, a\, x} \\ &= \left(\sqrt{0^{2} - 2 \times 18 \times 100}\right)\; {\rm ft \cdot s^{-1}} \\ &= 60\; {\rm ft \cdot s^{-1}}\end{aligned}[/tex].

In other words, this car was travelling at [tex]60\; {\rm ft \cdot s^{-1}}[/tex] before braking.

⇒ In Earth the gravitational Constant is ≅9.81

To get the weight of the car we use the formula W=m×g

where W is the letter that represents the weight

m represents the mass of the car and g represents the gravitational constant.

[tex]W=1110*9.81\\W=10889.1[/tex]

⇒Weight is a force, therefore the unit of measurement is N which stands for Newtons.

⇒The car with a mass of 1110kg weighs 10889.1 N on Earth.

Answer:

Explanation:

A car of mass 1110 kg weigh:

F = m·g

F = 1110·10 = 11100 N = 11.1 mN

The maximum acceleration of the beam is 12.18 g.

Centripetal acceleration is defined as the property of the motion of an object, traversing a circular path. The maximum centripetal acceleration is the rate at which the maximum angular velocity changes with time.

The centripetal acceleration is obtained by multiplying the radial acceleration by amplitude of the motion.

The maximum acceleration of the beam is calculated as follows;

a = ω²r

where;

maximum acceleration = ω²A

where;

The given parameters;

a(max) = (691.1²) x (0.25 x 10⁻³)

a(max) = 119.4 m/s²

In multiple of acceleration due to gravity (g) = 119.4 / 9.8 = 12.18 g

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The forecasting of global surface temperatures is one of the most significant results of climate models.

Scientists evaluate the effectiveness of their models by contrasting observations of the Earth's climate with predictions of future temperatures and "hindcasts" of past temperatures. Then, by comparing specific climate models and the average of all models to actual warming, scientists may determine whether temperature projections are accurate.

Researchers can have more faith that models can effectively predict future changes in the same factors if they successfully simulate the climate response in the past.

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There are four quantum numbers in chemistry. These are the principal quantum number, the angular momentum quantum number, the magnetic quantum number, and the spin quantum number. These all follow these three foundational rules in chemistry.

Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..

Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of  will be -2, -1, 0, +1, +2.

Therefore, we got to know that the values for each quantum number can be up to 4.

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Ultraviolet radiation has shorter waves than blue or violet light, and thus oscillates more rapidly and carries more energy per photon than visible light does.

Infrared and ultraviolet radiation are the neighbors of visible light in the electromagnetic spectrum.Red light contains shorter waves than infrared radiation, which causes it to oscillate at a lower frequency and carry less energy.

One way energy travels is as visible light.Light waves are an example of electromagnetic (EM) radiation because they are produced by the vibration of electric and magnetic fields.

Although visible light is only one of many different types of electromagnetic radiation and only makes up a very small portion of the entire electromagnetic spectrum, it holds unique relevance for us because we can see it with our eyes.

The wavelength of light is between 400 and 700 nanometers (4,000 to 7,000 angstroms).Our eyes interpret the various light wavelengths as the hues of the rainbow.

Around 700 nm length, the waves of red light are comparatively long.The wavelength of blue and purple light is only 400 nm.

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