Air pollutants often cause irritation in the _____
system.

Answer:

true

Explanation:

this is true, igneous rocks are formed from molten lava when it cools

Answer: True

Explanation:

A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is that in free fall all accelerations are g.

When an object is in free fall near the surface of the Earth, neglecting air resistance, it experiences a constant acceleration denoted as g, which is approximately equal to 9.8 m/s². This acceleration is due to the force of gravity acting on the object. The acceleration of an object in free fall is independent of its mass.

According to Newton's second law of motion, the force acting on an object is equal to its mass multiplied by its acceleration. In the case of free fall, the force acting on an object is its weight, which is given by the formula F = m × g, where F is the force, m is the mass, and g is the acceleration due to gravity.

Since the acceleration due to gravity is the same for all objects in free fall, the ratio of force to mass (F/m) is also the same. Therefore, regardless of the mass of the object, the acceleration experienced in free fall is always g.

This has been experimentally verified many times and is a fundamental principle in the study of gravitational acceleration.

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Answer:

December 21 or 22

Source:

Narrow sense heritability = ratio of additive genetic variance to the total phenotype variance

It is used more in practical because it is easily calculated and gives good estimate of broad sense heritability

heritability is

\(h^{2} = }\frac{v_{a} }{v_{p} }\)

\(v_{a}\) = variance in genotype

\(v_{b}\)= variance in phenotype

Genotype variance : It is one of genetic parameter that determine effectiveness of selection process in plant breeding.

Phenotype variance: It determines whether that trait has the ability to respond to natural or artificial selection.

Heritability estimates range in value from 0 to 1. If H = 0 there is no genetic variation in which all variation in the population comes from differences in the environment experienced by individual.

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Answer:

A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

Explanation:

Answer:

I think B but im not sure

Explanation:

Answer: i think both mirrors are used to reflect the beam of light.

Explanation:

gr 10 science right? im almost done the semester and i learnt this already so i think the best answer is the last one

Answer:True

Explanation:there are approximately 29.531 on the new moon and and 7.31 I think for the first quarter then it’s 7 days between them if u calculate their sped that light travels and that number it might be the same but the statement is true not false

Answer:

The full cycle of moon phases averages 29.531 days. A quarter of that is 7.38 days. So "7 days" is a pretty good approximation for casual conversation. It's true.

Explanation:

uh i think that was my explanation soooooo like yall have a good day and if you are working at 1am just know it is not gonna be so hard one day it is gonna get better hehe

A roller coaster accelerates at 8.75 m/s² from rest to a final velocity of 70 m/s it takes 8 sec to speed up.

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Answer:

The. Layers. Of. Earth. Has. Different temperatures so. They. Will. Have. Different. Particles

Explanation:

Mantle outerlayer. Etc. Different (can. I. Have. Brainliest. Please

A rubber ball and a stone of the same size are examples which will have more inertia and is therefore denoted as option A.

This is referred to as the property exhibited by a body in which it has the tendency to remain at rest or in uniform motion.This property is dependent on the mass of the substance as we can deduce that the greater the mass, the greater the inertia and vice versa.

The size of a rubber ball and stone will have different masses in which that of the stone will be greater. This is as a result of the difference in the nature of the substances which are used to make both items mentioned above.

This is therefore the reason why  a rubber ball and a stone of the same size as having more inertia(mass) where chosen as the most appropriate choice in this scenario.

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Answer:

The energy used in the pendulum is the initial Potential (Mechanical) Energy, P.E. given to the Clay ball attached to the inclined and extended string by virtue of its elevated position in relation to the rest position (lower state)

The swinging of the pendulum is brought about by the dynamic equilibrium between the initial potential energy, P.E. and the Kinetic Energy, K.E., of the pendulum when it is in motion

The (total) Mechanical Energy, M.E. of the ideal pendulum is constant at all times during the motion of the pendulum and it is given by the following formula;

M.E. = P.E. + K.E.

At the top of the swing, P.E. is maximum and K.E. is zero

Similarly, at the mid (lowest) point in the swing, instantaneously, P.E. is zero and K.E. is maximum

Explanation:

Answer:

35000Joules

Explanation:

Work is done whenever force moves a body through a particular distance.

Work done = force × distance

Force = 175 newton

Distance = 200 meters

Work done = 175newton × 200meters

Work done = 35000 Joules or 35Kilo joules

The work done is 35000joules

The magnetic field magnitude at the center of a solenoid having 2500 turn s/m when a 3 A current passes through it is 9.42 mA.

What is the solenoid?

A coil that is tightly wrapped in a helical shape is known as a solenoid. The magnetic field created by a current-carrying solenoid is such that it resembles the field produced by a magnetized bar magnet. The solenoid has many practical applications, including as a transformer, a coil gun, and an electromagnet. Here is the solution for the given problem:

Formula to calculate the magnetic field magnitude at the center of a solenoid is:

B = μ0 * (N/L) * I

Where,B is the magnetic field magnitudeμ0 is the permeability of free space, whose value is 4π×10−7 T·m/A.N is the total number of turns.L is the length of the solenoid.I is the current passing through the solenoid.

Substitute the given values in the formula.B = (4π×10−7) × (2500) × (3)B = 0.00942 T = 9.42 mA.

Thus, the magnetic field magnitude at the center of a solenoid having 2500 turns/m when a 3 A current passes through it is 9.42 mA.

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The man would need reading glasses with a refractive power of approximately -0.526 diopters to focus on a newspaper held at a comfortable distance of 40 cm.

To determine the refractive power needed for reading glasses, we can use the lens formula: 1/f = 1/v - 1/u Where: f is the focal length of the lens (in meters) v is the distance of the near point (in meters) u is the distance at which the object is held (in meters) In this case, the near point is given as 100 cm, which is 1 meter (v = 1 m), and the distance at which the object (newspaper) is held is 40 cm, which is 0.4 meters (u = 0.4 m). Let's substitute these values into the lens formula: 1/f = 1/1 - 1/0.4 Simplifying the equation: 1/f = 0.6 - 2.5 1/f = -1.9 Now, to find the refractive power (P) in diopters, we can use the formula: P = 1/f P = 1/-1.9 P ≈ -0.526 D Therefore, the man would need reading glasses with a refractive power of approximately -0.526 diopters to focus on a newspaper held at a comfortable distance of 40 cm.

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Answer:

i think it's A

as for the explanation I don't think I can help you with that sorry :(

Given :

A 1200 kg car initially traveling at 20 m/s increases its speed to 28m/s.

To Find :

How much work did the cars engine have to do to cause this change.

Solution :

We know, work done is given by :

Work Done = Final Kinetic Energy - Initial Kinetic Energy

\(Work \ Done = \dfrac{mv_f^2}{2} - \dfrac{mv_i^2}{2}\\\\Work \ Done = \dfrac{1200 \times 28^2}{2} - \dfrac{1200\times 20^2}{2}\\\\Work \ Done = 230400\ J\\\\Work \ Done = 230.4 \ kJ\)

Therefore, work done by car engine is 230.4 kJ.

Answer:

jahahsnsbhahajab

The hazard management process consists of a number of activities designed to reduce loss of life and destruction of property. Natural hazard management has often been conducted independently of development planning. A distinctive feature of OAS technical assistance is the integration of the two processes.

have a great day

This one is leisure for people with common sense. Yellow is an assortment of two of the rudimentary colors, red and green. Yellow appears yellow because red light is being imaged in our eyes, so that's one thing. Green reflections are capable of being enthralled by the shirt; hopefully, this should be meticulous adequate for you to have a basic understanding of this "phenomenon". Cheers!

A yellow T-shirt appear yellow to human eye because it reflects both red and green lights and our eye detects it as a combination of two fundamental colors (red and green), which is yellow.

Color is a perception. Our eyes sense something (the sky, for instance), and information is transferred from our eyes to our brains informing us that it is a particular color (blue). Different combinations of wavelengths of light are reflected by objects. When our brains detect certain wavelength combinations, they transform them into the phenomena known as color.

There has three fundamental color: red, blue and green. Red and green lights are combined to create yellow light. If a shirt reflects both red and green light, it appears yellow to human eyes. These two fundamental colors of light must be present in the incident light for red and green light to reflect yellow light to human mind.

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Option D, the sentence that best describes the object is the material of the object can be magnetized.​

The direction of the magnetic fields of the atoms that make up an object is always aligned towards the north pole or south of the material.

Objects that are made of unmagnetised  materials such iron, cobalt and nickel are attracted to either pole of a magnet, but not repelled.

The diagram given shows unmagnetised material, and hence the material of the object can be magnetized.​

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Answer:

look it up

Explanation:

An electrical shock is received when electrical current passes through the body. ... Whenever two wires are at different voltages, current will pass between them if they are connected. Your body can connect the wires if you touch both of them at the same time. Current will pass through your body.

Time Period of revolution of the astreoid around the sun is P = 8\(\sqrt{D^{3} }\) days.

The length of time it takes an astronomical object to complete one orbit around another object is known as the orbital period. In astronomy, it often refers to bodies like planets or asteroids revolving about the Sun, as well as moons circling other stars, exoplanets, and double stars.

In other words, the cube of the semi-major axis of any planet's orbit is equal to the square of the period of that planet's revolution around the sun. Despite the fact that all planetary orbits are elliptical, all save Pluto's are close enough to circular shapes to allow the word "radius" to be used instead of "semi-major axis." In other terms, the cube of a planet's distance from the sun (d) is equivalent to the square of a planet's period (P)

Let the distance of Earth from sun be D km

Distance of Astroid from sun is 4D km

Time taken by Astroid to orbit  sun be P days

Then,

P²= (4D)³

P = 8\(\sqrt{D^{3} }\)

Time Period of revolution  P = 8\(\sqrt{D^{3} }\)   days.

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Answer:

total energy

Explanation:

law of conservation of energy

Explanation:

v = u + at

8 = 0 + a (2) (u=0 at rest)

8 = 2a

a= 4 m/s²

Answer:

Explanation:

Acceleration is the change in velocity with respect to time.

Acceleration = change in velocity/Time

Acceleration = final velocity - initial velocity/Time

Given initial velocity = 10m/s

Final velocity = 20m/s

Time taken = 4s

Acceleration = 20-10/4

Acceleration = 10/4

Acceleration =2.5m/s²

For the second part of the question:

Given parameters

initial velocity = 15m/s

acceleration = -3m/s²

time = 4seconds

a = v-u/t

-3 = v-15/4

cross multiply

-12 = v-15

add 15 from both sides

-12+15 = v-15+15

3 = v

Hence the final velocity of the car is 3m/s

Answer: An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

Explanation: The parts of a circut bit can easily be found online, but heres a pic i found.

Answer:

Tectonic movement is the primary cause of earthquake.